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2015-09-30Fix i386 acosh (-qNaN) spurious "invalid" exception.Joseph Myers
The i386 versions of acoshf and acosh raise a spurious "invalid" exception for an argument that is a quiet NaN with the sign bit set. The integer arithmetic to detect arguments < 1 also detects -NaN, and then the computation 0 / 0 in that case raises the exception. This patch fixes this by using (x - x) / (x - x) as the computation in that case instead, which will always raise the exception for non-NaN arguments reaching that code, but not for quiet NaN arguments. Tested for x86_64 and x86. [BZ #19032] * sysdeps/i386/fpu/e_acosh.S (__ieee754_acosh): For arguments < 1, compute result as (x - x) / (x - x) not as 0 / 0. * sysdeps/i386/fpu/e_acoshf.S (__ieee754_acoshf): Likewise. * math/libm-test.inc (acosh_test_data): Add another test of acosh.
2015-09-28Fix clog, clog10 inaccuracy (bug 19016).Joseph Myers
For arguments with X^2 + Y^2 close to 1, clog and clog10 avoid large errors from log(hypot) by computing X^2 + Y^2 - 1 in a way that avoids cancellation error and then using log1p. However, the thresholds for using that approach still result in log being used on argument as large as sqrt(13/16) > 0.9, leading to significant errors, in some cases above the 9ulp maximum allowed in glibc libm. This patch arranges for the approach using log1p to be used in any cases where |X|, |Y| < 1 and X^2 + Y^2 >= 0.5 (with the existing allowance for cases where one of X and Y is very small), adjusting the __x2y2m1 functions to work with the wider range of inputs. This way, log only gets used on arguments below sqrt(1/2) (or substantially above 1), where the error involved is much less. Tested for x86_64, x86, mips64 and powerpc. For the ulps regeneration I removed the existing clog and clog10 ulps before regenerating to allow any reduced ulps to appear. Tests added include those found by random test generation to produce large ulps either before or after the patch, and some found by trying inputs close to the (0.75, 0.5) threshold where the potential errors from using log are largest. [BZ #19016] * sysdeps/generic/math_private.h (__x2y2m1f): Update comment to allow more cases with X^2 + Y^2 >= 0.5. * sysdeps/ieee754/dbl-64/x2y2m1.c (__x2y2m1): Likewise. Add -1 as normal element in sum instead of special-casing based on values of arguments. * sysdeps/ieee754/dbl-64/x2y2m1f.c (__x2y2m1f): Update comment. * sysdeps/ieee754/ldbl-128/x2y2m1l.c (__x2y2m1l): Likewise. Add -1 as normal element in sum instead of special-casing based on values of arguments. * sysdeps/ieee754/ldbl-128ibm/x2y2m1l.c (__x2y2m1l): Likewise. * sysdeps/ieee754/ldbl-96/x2y2m1.c [FLT_EVAL_METHOD != 0] (__x2y2m1): Update comment. * sysdeps/ieee754/ldbl-96/x2y2m1l.c (__x2y2m1l): Likewise. Add -1 as normal element in sum instead of special-casing based on values of arguments. * math/s_clog.c (__clog): Handle more cases using log1p without hypot. * math/s_clog10.c (__clog10): Likewise. * math/s_clog10f.c (__clog10f): Likewise. * math/s_clog10l.c (__clog10l): Likewise. * math/s_clogf.c (__clogf): Likewise. * math/s_clogl.c (__clogl): Likewise. * math/auto-libm-test-in: Add more tests of clog and clog10. * math/auto-libm-test-out: Regenerated. * sysdeps/i386/fpu/libm-test-ulps: Update. * sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-09-25Fix pow missing underflows (bug 18825).Joseph Myers
Similar to various other bugs in this area, pow functions can fail to raise the underflow exception when the result is tiny and inexact but one or more low bits of the intermediate result that is scaled down (or, in the i386 case, converted from a wider evaluation format) are zero. This patch forces the exception in a similar way to previous fixes, thereby concluding the fixes for known bugs with missing underflow exceptions currently filed in Bugzilla. Tested for x86_64, x86, mips64 and powerpc. [BZ #18825] * sysdeps/i386/fpu/i386-math-asm.h (FLT_NARROW_EVAL_UFLOW_NONNAN): New macro. (DBL_NARROW_EVAL_UFLOW_NONNAN): Likewise. (LDBL_CHECK_FORCE_UFLOW_NONNAN): Likewise. * sysdeps/i386/fpu/e_pow.S: Use DEFINE_DBL_MIN. (__ieee754_pow): Use DBL_NARROW_EVAL_UFLOW_NONNAN instead of DBL_NARROW_EVAL, reloading the PIC register as needed. * sysdeps/i386/fpu/e_powf.S: Use DEFINE_FLT_MIN. (__ieee754_powf): Use FLT_NARROW_EVAL_UFLOW_NONNAN instead of FLT_NARROW_EVAL. Use separate return path for case when first argument is NaN. * sysdeps/i386/fpu/e_powl.S: Include <i386-math-asm.h>. Use DEFINE_LDBL_MIN. (__ieee754_powl): Use LDBL_CHECK_FORCE_UFLOW_NONNAN, reloading the PIC register. * sysdeps/ieee754/dbl-64/e_pow.c (__ieee754_pow): Use math_check_force_underflow_nonneg. * sysdeps/ieee754/flt-32/e_powf.c (__ieee754_powf): Force underflow for subnormal result. * sysdeps/ieee754/ldbl-128/e_powl.c (__ieee754_powl): Likewise. * sysdeps/ieee754/ldbl-128ibm/e_powl.c (__ieee754_powl): Use math_check_force_underflow_nonneg. * sysdeps/x86/fpu/powl_helper.c (__powl_helper): Use math_check_force_underflow. * sysdeps/x86_64/fpu/x86_64-math-asm.h (LDBL_CHECK_FORCE_UFLOW_NONNAN): New macro. * sysdeps/x86_64/fpu/e_powl.S: Include <x86_64-math-asm.h>. Use DEFINE_LDBL_MIN. (__ieee754_powl): Use LDBL_CHECK_FORCE_UFLOW_NONNAN. * math/auto-libm-test-in: Add more tests of pow. * math/auto-libm-test-out: Regenerated.
2015-09-24Fix hypot missing underflows (bug 18803).Joseph Myers
Similar to various other bugs in this area, hypot functions can fail to raise the underflow exception when the result is tiny and inexact but one or more low bits of the intermediate result that is scaled down (or, in the i386 case, converted from a wider evaluation format) are zero. This patch forces the exception in a similar way to previous fixes. Note that this issue cannot arise for implementations of hypotf using double (or wider) for intermediate evaluation (if hypotf should underflow, that means the double square root is being computed of some number of the form N*2^-298, for 0 < N < 2^46, which is exactly represented as a double, and whatever the rounding mode such a square root cannot have a mantissa with all zeroes after the initial 23 bits). Thus no changes are made to hypotf implementations in this patch, only to hypot and hypotl. Tested for x86_64, x86, mips64 and powerpc. [BZ #18803] * sysdeps/i386/fpu/e_hypot.S: Use DEFINE_DBL_MIN. (MO): New macro. (__ieee754_hypot) [PIC]: Load PIC register. (__ieee754_hypot): Use DBL_NARROW_EVAL_UFLOW_NONNEG instead of DBL_NARROW_EVAL. * sysdeps/ieee754/dbl-64/e_hypot.c (__ieee754_hypot): Use math_check_force_underflow_nonneg in case where result might be tiny. * sysdeps/ieee754/ldbl-128/e_hypotl.c (__ieee754_hypotl): Likewise. * sysdeps/ieee754/ldbl-128ibm/e_hypotl.c (__ieee754_hypotl): Likewise. * sysdeps/ieee754/ldbl-96/e_hypotl.c (__ieee754_hypotl): Likewise. * sysdeps/powerpc/fpu/e_hypot.c (__ieee754_hypot): Likewise. * math/auto-libm-test-in: Add more tests of hypot. * math/auto-libm-test-out: Regenerated.
2015-09-24Use LOAD_PIC_REG in i386 atanh.Joseph Myers
sysdeps/i386/fpu/e_atanh.S, unlike all other functions in that directory, loads the PIC register with its own code using _GLOBAL_OFFSET_TABLE_, rather than with the LOAD_PIC_REG macro. I see no good reason for the difference; this patch makes it use the common macro. Tested for x86. * sysdeps/i386/fpu/e_atanh.S (__ieee754_atanh) [PIC]: Use LOAD_PIC_REG.
2015-09-24Refactor i386 libm code forcing underflow exceptions.Joseph Myers
This patch refactors code in sysdeps/i386/fpu that forces underflow exceptions to use common macros for that purpose as far as possible. (Although some of the macros end up used in only one place, I think it's cleanest to define all these macros together so that all the code forcing underflow uses such macros. Some more uses of such macros will also be introduced when fixing remaining bugs about missing underflow exceptions, and it would be possible to do further refactoring of the macros in i386-math-asm.h to share more code by using other macros internally. Places that test for underflow by examining the representation of the argument with integer operations, rather that using floating-point comparisons on the argument or result, are unchanged by this patch.) Most of this code uses a macro MO to abstract away the differences between PIC and non-PIC memory references to constants. log1p functions, however, hardcoded PIC conditionals for this. Because the common macros rely on the use of MO, I changed the log1p functions to use the normal style here, and, for consistency, also made that change to log1pl which is otherwise unaffected by this patch. Tested for x86. * sysdeps/i386/fpu/i386-math-asm.h (DEFINE_LDBL_MIN): New macro. (FLT_CHECK_FORCE_UFLOW): Likewise. (DBL_CHECK_FORCE_UFLOW): Likewise. (FLT_CHECK_FORCE_UFLOW_NARROW): Likewise. (DBL_CHECK_FORCE_UFLOW_NARROW): Likewise. (LDBL_CHECK_FORCE_UFLOW_NONNEG_NAN): Likewise. (FLT_CHECK_FORCE_UFLOW_NONNAN): Likewise. (DBL_CHECK_FORCE_UFLOW_NONNAN): Likewise. (FLT_CHECK_FORCE_UFLOW_NONNEG): Likewise. (DBL_CHECK_FORCE_UFLOW_NONNEG): Likewise. (LDBL_CHECK_FORCE_UFLOW_NONNEG): Likewise. * sysdeps/i386/fpu/e_asin.S: Include <i386-math-asm.h>. (dbl_min): Replace with use of DEFINE_DBL_MIN. (__ieee754_asin): Use DBL_CHECK_FORCE_UFLOW. * sysdeps/i386/fpu/e_asinf.S: Include <i386-math-asm.h>. (flt_min): Replace with use of DEFINE_FLT_MIN. (__ieee754_asinf): Use FLT_CHECK_FORCE_UFLOW. * sysdeps/i386/fpu/e_atan2.S: Include <i386-math-asm.h>. (dbl_min): Replace with use of DEFINE_DBL_MIN. (__ieee754_atan2): Use DBL_CHECK_FORCE_UFLOW_NARROW. * sysdeps/i386/fpu/e_atan2f.S: Include <i386-math-asm.h>. (flt_min): Replace with use of DEFINE_FLT_MIN. (__ieee754_atan2f): Use FLT_CHECK_FORCE_UFLOW_NARROW. * sysdeps/i386/fpu/e_atanh.S: Include <i386-math-asm.h>. (dbl_min): Replace with use of DEFINE_DBL_MIN. (__ieee754_atanh): Use DBL_CHECK_FORCE_UFLOW_NONNEG. * sysdeps/i386/fpu/e_atanhf.S: Include <i386-math-asm.h>. (flt_min): Replace with use of DEFINE_FLT_MIN. (__ieee754_atanhf): Use FLT_CHECK_FORCE_UFLOW_NONNEG. * sysdeps/i386/fpu/e_exp2l.S: Include <i386-math-asm.h>. (ldbl_min): Replace with use of DEFINE_LDBL_MIN. (__ieee754_exp2l): Use LDBL_CHECK_FORCE_UFLOW_NONNEG_NAN. * sysdeps/i386/fpu/e_expl.S: Include <i386-math-asm.h>. [!USE_AS_EXPM1L] (cmin): Replace with use of DEFINE_LDBL_MIN. (IEEE754_EXPL): Use LDBL_CHECK_FORCE_UFLOW_NONNEG. * sysdeps/i386/fpu/s_atan.S: Include <i386-math-asm.h>. (dbl_min): Replace with use of DEFINE_DBL_MIN. (__atan): Use DBL_CHECK_FORCE_UFLOW. * sysdeps/i386/fpu/s_atanf.S: Include <i386-math-asm.h>. (flt_min): Replace with use of DEFINE_FLT_MIN. (__atanf): Use FLT_CHECK_FORCE_UFLOW. * sysdeps/i386/fpu/s_expm1.S: Include <i386-math-asm.h>. (dbl_min): Replace with use of DEFINE_DBL_MIN. (__expm1): Use DBL_CHECK_FORCE_UFLOW. Move underflow check after main computation. * sysdeps/i386/fpu/s_expm1f.S: Include <i386-math-asm.h>. (flt_min): Replace with use of DEFINE_FLT_MIN. (__expm1f): Use FLT_CHECK_FORCE_UFLOW. Move underflow check after main computation. * sysdeps/i386/fpu/s_log1p.S: Include <i386-math-asm.h>. (dbl_min): Replace with use of DEFINE_DBL_MIN. (MO): New macro. (__log1p): Use MO. Use DBL_CHECK_FORCE_UFLOW_NONNAN. * sysdeps/i386/fpu/s_log1pf.S: Include <i386-math-asm.h>. (flt_min): Replace with use of DEFINE_FLT_MIN. (MO): New macro. (__log1pf): Use MO. Use FLT_CHECK_FORCE_UFLOW_NONNAN. * sysdeps/i386/fpu/s_log1pl.S (MO): New macro. (__log1pl): Use MO.
2015-09-23Use math_narrow_eval more consistently.Joseph Myers
Where glibc code needs to avoid excess range and precision in floating-point arithmetic, code variously uses either asms or volatile to force the results of that arithmetic to memory; mostly this is conditional on FLT_EVAL_METHOD, but in the case of lrint / llrint functions some use of volatile is unconditional (and is present unnecessarily in versions for long double). This patch make such code use the recently-added math_narrow_eval macro consistently, removing the unnecessary uses of volatile in long double lrint / llrint implementations completely. Tested for x86_64, x86, mips64 and powerpc. * math/s_nexttowardf.c (__nexttowardf): Use math_narrow_eval. * stdlib/strtod_l.c: Include <math_private.h>. (overflow_value): Use math_narrow_eval. (underflow_value): Likewise. * sysdeps/i386/fpu/s_nexttoward.c (__nexttoward): Likewise. * sysdeps/i386/fpu/s_nexttowardf.c (__nexttowardf): Likewise. * sysdeps/ieee754/dbl-64/e_gamma_r.c (gamma_positive): Likewise. (__ieee754_gamma_r): Likewise. * sysdeps/ieee754/dbl-64/gamma_productf.c (__gamma_productf): Likewise. * sysdeps/ieee754/dbl-64/k_rem_pio2.c (__kernel_rem_pio2): Likewise. * sysdeps/ieee754/dbl-64/lgamma_neg.c (__lgamma_neg): Likewise. * sysdeps/ieee754/dbl-64/s_erf.c (__erfc): Likewise. * sysdeps/ieee754/dbl-64/s_llrint.c (__llrint): Likewise. * sysdeps/ieee754/dbl-64/s_lrint.c (__lrint): Likewise. * sysdeps/ieee754/flt-32/e_gammaf_r.c (gammaf_positive): Likewise. (__ieee754_gammaf_r): Likewise. * sysdeps/ieee754/flt-32/k_rem_pio2f.c (__kernel_rem_pio2f): Likewise. * sysdeps/ieee754/flt-32/lgamma_negf.c (__lgamma_negf): Likewise. * sysdeps/ieee754/flt-32/s_erff.c (__erfcf): Likewise. * sysdeps/ieee754/flt-32/s_llrintf.c (__llrintf): Likewise. * sysdeps/ieee754/flt-32/s_lrintf.c (__lrintf): Likewise. * sysdeps/ieee754/ldbl-128/s_llrintl.c (__llrintl): Do not use volatile. * sysdeps/ieee754/ldbl-128/s_lrintl.c (__lrintl): Likewise. * sysdeps/ieee754/ldbl-128/s_nexttoward.c (__nexttoward): Use math_narrow_eval. * sysdeps/ieee754/ldbl-128ibm/s_nexttoward.c (__nexttoward): Likewise. * sysdeps/ieee754/ldbl-128ibm/s_nexttowardf.c (__nexttowardf): Likewise. * sysdeps/ieee754/ldbl-96/gamma_product.c (__gamma_product): Likewise. * sysdeps/ieee754/ldbl-96/s_llrintl.c (__llrintl): Do not use volatile. * sysdeps/ieee754/ldbl-96/s_lrintl.c (__lrintl): Likewise. * sysdeps/ieee754/ldbl-96/s_nexttoward.c (__nexttoward): Use math_narrow_eval. * sysdeps/ieee754/ldbl-96/s_nexttowardf.c (__nexttowardf): Likewise. * sysdeps/ieee754/ldbl-opt/s_nexttowardfd.c (__nldbl_nexttowardf): Likewise.
2015-09-18Avoid excess range in results from i386 exp, hypot, pow functions (bug 18980).Joseph Myers
i386 exp, hypot and pow functions can return overflowing and underflowing values with excess range and precision; ; Wilco Dijkstra's patches to make isfinite etc. expand inline cause this pre-existing issue to result in test failures. This patch fixes those functions to avoid excess range and precision in their return values. Appropriate macros are added for the repeated code sequences; in future I'll add more such macros and refactor existing code forcing underflow (with or without also eliminating excess range and precision from the return value) to use such macros. Tested for x86. If, after this patch, you still see x86 libm test failures with excess range or precision, please file bugs in Bugzilla. [BZ #18980] * sysdeps/i386/fpu/i386-math-asm.h (DEFINE_FLT_MIN): New macro. (DEFINE_DBL_MIN): Likewise. (FLT_NARROW_EVAL_UFLOW_NONNEG_NAN): Likewise. (DBL_NARROW_EVAL_UFLOW_NONNEG_NAN): Likewise. (FLT_NARROW_EVAL_UFLOW_NONNEG): Likewise. (DBL_NARROW_EVAL_UFLOW_NONNEG): Likewise. * sysdeps/i386/fpu/e_exp.S: Include <i386-math-asm.h>. (dbl_min): Replace with use of DEFINE_DBL_MIN. (__ieee754_exp): Use DBL_NARROW_EVAL_UFLOW_NONNEG_NAN. (__exp_finite): Use DBL_NARROW_EVAL_UFLOW_NONNEG. * sysdeps/i386/fpu/e_exp10.S: Include <i386-math-asm.h>. (dbl_min): Replace with use of DEFINE_DBL_MIN. (__ieee754_exp10): Use DBL_NARROW_EVAL_UFLOW_NONNEG_NAN. * sysdeps/i386/fpu/e_exp10f.S: Include <i386-math-asm.h>. (flt_min): Replace with use of DEFINE_FLT_MIN. (__ieee754_exp10f): Use FLT_NARROW_EVAL_UFLOW_NONNEG_NAN. * sysdeps/i386/fpu/e_exp2.S: Include <i386-math-asm.h>. (dbl_min): Replace with use of DEFINE_DBL_MIN. (__ieee754_exp2): Use DBL_NARROW_EVAL_UFLOW_NONNEG_NAN. * sysdeps/i386/fpu/e_exp2f.S: Include <i386-math-asm.h>. (flt_min): Replace with use of DEFINE_FLT_MIN. (__ieee754_exp2f): Use FLT_NARROW_EVAL_UFLOW_NONNEG_NAN. * sysdeps/i386/fpu/e_expf.S: Include <i386-math-asm.h>. (flt_min): Replace with use of DEFINE_FLT_MIN. (__ieee754_expf): Use FLT_NARROW_EVAL_UFLOW_NONNEG_NAN. (__expf_finite): Use FLT_NARROW_EVAL_UFLOW_NONNEG. * sysdeps/i386/fpu/e_hypot.S: Include <i386-math-asm.h>. (__ieee754_hypot): Use DBL_NARROW_EVAL. * sysdeps/i386/fpu/e_hypotf.S: Include <i386-math-asm.h>. (__ieee754_hypotf): Use FLT_NARROW_EVAL. * sysdeps/i386/fpu/e_pow.S: Include <i386-math-asm.h>. (__ieee754_pow): Use DBL_NARROW_EVAL. * sysdeps/i386/fpu/e_powf.S: Include <i386-math-asm.h>. (__ieee754_powf): Use FLT_NARROW_EVAL. * sysdeps/i386/i686/fpu/multiarch/e_expf-sse2.S (__ieee754_expf_sse2): Convert double-precision result to single precision. * sysdeps/i386/fpu/libm-test-ulps: Update.
2015-09-18Avoid excess range in results from i386 scalb functions (bug 18981).Joseph Myers
i386 scalb / scalbn / scalbln (and thus ldexp) functions for float and double can return results with excess range (and consequently excess precision for subnormal results). As the results of these functions are fully determined by reference to IEEE 754 operations, this is unambiguously a bug, apart from the testsuite failures it causes. This patch makes those functions store their results on the stack and load them back to eliminate the excess range. Double rounding is not a problem, as the only cases where it could occur are when the result overflows or underflows for extended precision, and then the double-rounded results are the same as the single-rounded results. The new macros will be used for more functions, more such macros added, and existing code refactored to use such macros, in subsequent patches. Tested for x86. Committed. [BZ #18981] * sysdeps/i386/fpu/i386-math-asm.h: New file. * sysdeps/i386/fpu/e_scalb.S: Include <i386-math-asm.h>. (__ieee754_scalb): Use DBL_NARROW_EVAL. * sysdeps/i386/fpu/e_scalbf.S: Include <i386-math-asm.h>. (__ieee754_scalbf): Use FLT_NARROW_EVAL. * sysdeps/i386/fpu/s_scalbn.S: Include <i386-math-asm.h>. (__scalbn): Use DBL_NARROW_EVAL. * sysdeps/i386/fpu/s_scalbnf.S: Include <i386-math-asm.h>. (__scalbnf): Use FLT_NARROW_EVAL.
2015-09-16Make scalbn set errno (bug 6803).Joseph Myers
As noted in bug 6803, scalbn fails to set errno on overflow and underflow. This patch fixes this by making scalbn an alias of ldexp, which has exactly the same semantics (for floating-point types with radix 2) and already has wrappers that deal with setting errno, instead of an alias of the internal __scalbn (which ldexp calls). Notes: * Where compat symbols were defined for scalbn functions, I didn't change what they point to (to keep the patch minimal), so such compat symbols continue to go directly to the non-errno-setting functions. * Mike, I didn't do anything with the IA64 versions of these functions, where I think both the ldexp and scalbn functions already deal with setting errno. As a cleanup (not needed to fix this bug) however you might want to make those functions into aliases for IA64; there is no need for them to be separate function implementations at all. * This concludes the fix for bug 6803 since the scalb and scalbln cases of that bug were fixed some time ago. Tested for x86_64, x86, mips64 and powerpc. [BZ #6803] * math/s_ldexp.c (scalbn): Define as weak alias of __ldexp. [NO_LONG_DOUBLE] (scalbnl): Define as weak alias of __ldexp. * math/s_ldexpf.c (scalbnf): Define as weak alias of __ldexpf. * math/s_ldexpl.c (scalbnl): Define as weak alias of __ldexpl. * sysdeps/i386/fpu/s_scalbn.S (scalbn): Remove alias. * sysdeps/i386/fpu/s_scalbnf.S (scalbnf): Likewise. * sysdeps/i386/fpu/s_scalbnl.S (scalbnl): Likewise. * sysdeps/ieee754/dbl-64/s_scalbn.c (scalbn): Likewise. [NO_LONG_DOUBLE] (scalbnl): Likewise. * sysdeps/ieee754/dbl-64/wordsize-64/s_scalbn.c (scalbn): Likewise. [NO_LONG_DOUBLE] (scalbnl): Likewise. * sysdeps/ieee754/flt-32/s_scalbnf.c (scalbnf): Likewise. * sysdeps/ieee754/ldbl-128/s_scalbnl.c (scalbnl): Likewise. * sysdeps/ieee754/ldbl-128ibm/s_scalbnl.c (scalbnl): Remove long_double_symbol calls. * sysdeps/ieee754/ldbl-64-128/s_scalbnl.c (scalbnl): Likewise. * sysdeps/ieee754/ldbl-opt/s_ldexpl.c (__ldexpl_2): Define as strong alias of __ldexpl. (scalbnl): Define using long_double_symbol. * sysdeps/m68k/m680x0/fpu/s_scalbn.c (__CONCATX(scalbn,suffix)): Remove alias. * sysdeps/sparc/sparc64/soft-fp/s_scalbnl.c (scalbnl): Likewise. * sysdeps/x86_64/fpu/s_scalbnl.S (scalbnl): Likewise. * math/libm-test.inc (scalbn_test_data): Add errno expectations. (scalbln_test_data): Add more errno expectations.
2015-09-15Fix i386 exp10 missing underflows (bug 18966).Joseph Myers
On i386, the double version of exp10 can miss underflow exceptions if the result is in the subnormal range for double but the last 11 bits of the 64-bit extended-precision mantissa happen to be zero. This patch forces the exception in a similar way to previous fixes. As with the exp2 and exp fixes, the exp10f changes may in fact not be needed to ensure underflow exceptions, but are included for consistency and to fix the exp10 part of bug 18875 by ensuring that excess range and precision is removed from underflowing return values. Tested for x86_64 and x86. [BZ #18875] [BZ #18966] * sysdeps/i386/fpu/e_exp10.S (dbl_min): New object. (MO): New macro. (__ieee754_exp10): For small results, force underflow exception and remove excess range and precision from return value. * sysdeps/i386/fpu/e_exp10f.S (flt_min): New object. (MO): New macro. (__ieee754_exp10f): For small results, force underflow exception and remove excess range and precision from return value. * math/auto-libm-test-in: Add more tests of exp10. * math/auto-libm-test-out: Regenerated.
2015-09-14Fix i386 exp missing underflows (bug 18961).Joseph Myers
On i386, the double version of exp can miss underflow exceptions if the result is in the subnormal range for double but the last 11 bits of the 64-bit extended-precision mantissa happen to be zero. This patch forces the exception in a similar way to previous fixes. As with the exp2 fixes, the expf changes may in fact not be needed to ensure underflow exceptions, but are included for consistency and to fix the exp part of bug 18875 by ensuring that excess range and precision is removed from underflowing return values. Tested for x86_64 and x86. [BZ #18875] [BZ #18961] * sysdeps/i386/fpu/e_exp.S (dbl_min): New object. (MO): New macro. (__ieee754_exp): For small results, force underflow exception and remove excess range and precision from return value. (__exp_finite): Likewise. * sysdeps/i386/fpu/e_expf.S (flt_min): New object. (MO): New macro. (__ieee754_expf): For small results, force underflow exception and remove excess range and precision from return value. (__expf_finite): Likewise. * math/auto-libm-test-in: Add more tests of exp. * math/auto-libm-test-out: Regenerated.
2015-09-14Fix exp2 missing underflows (bug 16521).Joseph Myers
Various exp2 implementations in glibc can miss underflow exceptions when the scaling down part of the calculation is exact (or, in the x86 case, when the conversion from extended precision to the target precision is exact). This patch forces the exception in a similar way to previous fixes. The x86 exp2f changes may in fact not be needed for this purpose - it's likely to be the case that no argument of type float has an exp2 result so close to an exact subnormal float value that it equals that value when rounded to 64 bits (even taking account of variation between different x86 implementations). However, they are included for consistency with the changes to exp2 and so as to fix the exp2f part of bug 18875 by ensuring that excess range and precision is removed from underflowing return values. Tested for x86_64, x86 and mips64. [BZ #16521] [BZ #18875] * math/e_exp2l.c (__ieee754_exp2l): Force underflow exception for small results. * sysdeps/i386/fpu/e_exp2.S (dbl_min): New object. (MO): New macro. (__ieee754_exp2): For small results, force underflow exception and remove excess range and precision from return value. * sysdeps/i386/fpu/e_exp2f.S (flt_min): New object. (MO): New macro. (__ieee754_exp2f): For small results, force underflow exception and remove excess range and precision from return value. * sysdeps/i386/fpu/e_exp2l.S (ldbl_min): New object. (MO): New macro. (__ieee754_exp2l): Force underflow exception for small results. * sysdeps/ieee754/dbl-64/e_exp2.c (__ieee754_exp2): Likewise. * sysdeps/ieee754/flt-32/e_exp2f.c (__ieee754_exp2f): Likewise. * sysdeps/x86_64/fpu/e_exp2l.S (ldbl_min): New object. (MO): New macro. (__ieee754_exp2l): Force underflow exception for small results. * math/auto-libm-test-in: Add more tests or exp2. * math/auto-libm-test-out: Regenerated.
2015-09-12Add more random libm test inputs (mainly for ldbl-128).Joseph Myers
This patch adds more libm test inputs found through random test generation to increase previously known ulps. This particular test generation was run for mips64, so most of the increased ulps are for ldbl-128 (float and double having been fairly well covered by such testing for x86_64), but there's the odd ulps increase for other formats. Tested for x86_64, x86 and mips64. * math/auto-libm-test-in: Add more tests of acos, acosh, asin, asinh, atan, atan2, atanh, cabs, carg, cos, csqrt, erfc, exp, exp10, exp2, log, log1p, log2, pow, sin, sincos, sinh, tan and tanh. * math/auto-libm-test-out: Regenerated. * sysdeps/i386/fpu/libm-test-ulps: Update. * sysdeps/mips/mips32/libm-test-ulps: Likewise. * sysdeps/mips/mips64/libm-test-ulps: Likewise. * sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-09-11Move bits/atomic.h to atomic-machine.h (bug 14912).Joseph Myers
It was noted in <https://sourceware.org/ml/libc-alpha/2012-09/msg00305.html> that the bits/*.h naming scheme should only be used for installed headers. This patch renames bits/atomic.h to atomic-machine.h to follow that convention. This is the only change in this series that needs to change the filename rather than simply removing a directory level (because both atomic.h and bits/atomic.h exist at present). Tested for x86_64 (testsuite, and that installed stripped shared libraries are unchanged by the patch). [BZ #14912] * sysdeps/aarch64/bits/atomic.h: Move to ... * sysdeps/aarch64/atomic-machine.h: ...here. (_AARCH64_BITS_ATOMIC_H): Rename macro to _AARCH64_ATOMIC_MACHINE_H. * sysdeps/alpha/bits/atomic.h: Move to ... * sysdeps/alpha/atomic-machine.h: ...here. * sysdeps/arm/bits/atomic.h: Move to ... * sysdeps/arm/atomic-machine.h: ...here. Update comments. * bits/atomic.h: Move to ... * sysdeps/generic/atomic-machine.h: ...here. (_BITS_ATOMIC_H): Rename macro to _ATOMIC_MACHINE_H. * sysdeps/i386/bits/atomic.h: Move to ... * sysdeps/i386/atomic-machine.h: ...here. * sysdeps/ia64/bits/atomic.h: Move to ... * sysdeps/ia64/atomic-machine.h: ...here. * sysdeps/m68k/coldfire/bits/atomic.h: Move to ... * sysdeps/m68k/coldfire/atomic-machine.h: ...here. (_BITS_ATOMIC_H): Rename macro to _ATOMIC_MACHINE_H. * sysdeps/m68k/m680x0/m68020/bits/atomic.h: Move to ... * sysdeps/m68k/m680x0/m68020/atomic-machine.h: ...here. * sysdeps/microblaze/bits/atomic.h: Move to ... * sysdeps/microblaze/atomic-machine.h: ...here. * sysdeps/mips/bits/atomic.h: Move to ... * sysdeps/mips/atomic-machine.h: ...here. (_MIPS_BITS_ATOMIC_H): Rename macro to _MIPS_ATOMIC_MACHINE_H. * sysdeps/powerpc/bits/atomic.h: Move to ... * sysdeps/powerpc/atomic-machine.h: ...here. Update comments. * sysdeps/powerpc/powerpc32/bits/atomic.h: Move to ... * sysdeps/powerpc/powerpc32/atomic-machine.h: ...here. Update comments. Include <atomic-machine.h> instead of <bits/atomic.h>. * sysdeps/powerpc/powerpc64/bits/atomic.h: Move to ... * sysdeps/powerpc/powerpc64/atomic-machine.h: ...here. Include <atomic-machine.h> instead of <bits/atomic.h>. * sysdeps/s390/bits/atomic.h: Move to ... * sysdeps/s390/atomic-machine.h: ...here. * sysdeps/sparc/sparc32/bits/atomic.h: Move to ... * sysdeps/sparc/sparc32/atomic-machine.h: ...here. (_BITS_ATOMIC_H): Rename macro to _ATOMIC_MACHINE_H. * sysdeps/sparc/sparc32/sparcv9/bits/atomic.h: Move to ... * sysdeps/sparc/sparc32/sparcv9/atomic-machine.h: ...here. * sysdeps/sparc/sparc64/bits/atomic.h: Move to ... * sysdeps/sparc/sparc64/atomic-machine.h: ...here. * sysdeps/tile/bits/atomic.h: Move to ... * sysdeps/tile/atomic-machine.h: ...here. * sysdeps/tile/tilegx/bits/atomic.h: Move to ... * sysdeps/tile/tilegx/atomic-machine.h: ...here. Include <sysdeps/tile/atomic-machine.h> instead of <sysdeps/tile/bits/atomic.h>. (_BITS_ATOMIC_H): Rename macro to _ATOMIC_MACHINE_H. * sysdeps/tile/tilepro/bits/atomic.h: Move to ... * sysdeps/tile/tilepro/atomic-machine.h: ...here. Include <sysdeps/tile/atomic-machine.h> instead of <sysdeps/tile/bits/atomic.h>. (_BITS_ATOMIC_H): Rename macro to _ATOMIC_MACHINE_H. * sysdeps/unix/sysv/linux/arm/bits/atomic.h: Move to ... * sysdeps/unix/sysv/linux/arm/atomic-machine.h: ...here. Include <sysdeps/arm/atomic-machine.h> instead of <sysdeps/arm/bits/atomic.h>. * sysdeps/unix/sysv/linux/hppa/bits/atomic.h: Move to ... * sysdeps/unix/sysv/linux/hppa/atomic-machine.h: ...here. (_BITS_ATOMIC_H): Rename macro to _ATOMIC_MACHINE_H. * sysdeps/unix/sysv/linux/m68k/coldfire/bits/atomic.h: Move to ... * sysdeps/unix/sysv/linux/m68k/coldfire/atomic-machine.h: ...here. (_BITS_ATOMIC_H): Rename macro to _ATOMIC_MACHINE_H. * sysdeps/unix/sysv/linux/nios2/bits/atomic.h: Move to ... * sysdeps/unix/sysv/linux/nios2/atomic-machine.h: ...here. (_NIOS2_BITS_ATOMIC_H): Rename macro to _NIOS2_ATOMIC_MACHINE_H. * sysdeps/unix/sysv/linux/sh/bits/atomic.h: Move to ... * sysdeps/unix/sysv/linux/sh/atomic-machine.h: ...here. * sysdeps/x86_64/bits/atomic.h: Move to ... * sysdeps/x86_64/atomic-machine.h: ...here. * include/atomic.h: Include <atomic-machine.h> instead of <bits/atomic.h>.
2015-09-11Add more randomly-generated libm tests.Joseph Myers
This patch adds more libm test inputs found through random test generation to increase observed ulps on x86_64. Tested for x86_64 and x86. * math/auto-libm-test-in: Add more tests of acosh, atanh, cbrt, cosh, csqrt, erfc, expm1 and lgamma. * math/auto-libm-test-out: Regenerated. * sysdeps/i386/fpu/libm-test-ulps: Update. * sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-09-10Fix lgamma (negative) inaccuracy (bug 2542, bug 2543, bug 2558).Joseph Myers
The existing implementations of lgamma functions (except for the ia64 versions) use the reflection formula for negative arguments. This suffers large inaccuracy from cancellation near zeros of lgamma (near where the gamma function is +/- 1). This patch fixes this inaccuracy. For arguments above -2, there are no zeros and no large cancellation, while for sufficiently large negative arguments the zeros are so close to integers that even for integers +/- 1ulp the log(gamma(1-x)) term dominates and cancellation is not significant. Thus, it is only necessary to take special care about cancellation for arguments around a limited number of zeros. Accordingly, this patch uses precomputed tables of relevant zeros, expressed as the sum of two floating-point values. The log of the ratio of two sines can be computed accurately using log1p in cases where log would lose accuracy. The log of the ratio of two gamma(1-x) values can be computed using Stirling's approximation (the difference between two values of that approximation to lgamma being computable without computing the two values and then subtracting), with appropriate adjustments (which don't reduce accuracy too much) in cases where 1-x is too small to use Stirling's approximation directly. In the interval from -3 to -2, using the ratios of sines and of gamma(1-x) can still produce too much cancellation between those two parts of the computation (and that interval is also the worst interval for computing the ratio between gamma(1-x) values, which computation becomes more accurate, while being less critical for the final result, for larger 1-x). Because this can result in errors slightly above those accepted in glibc, this interval is instead dealt with by polynomial approximations. Separate polynomial approximations to (|gamma(x)|-1)(x-n)/(x-x0) are used for each interval of length 1/8 from -3 to -2, where n (-3 or -2) is the nearest integer to the 1/8-interval and x0 is the zero of lgamma in the relevant half-integer interval (-3 to -2.5 or -2.5 to -2). Together, the two approaches are intended to give sufficient accuracy for all negative arguments in the problem range. Outside that range, the previous implementation continues to be used. Tested for x86_64, x86, mips64 and powerpc. The mips64 and powerpc testing shows up pre-existing problems for ldbl-128 and ldbl-128ibm with large negative arguments giving spurious "invalid" exceptions (exposed by newly added tests for cases this patch doesn't affect the logic for); I'll address those problems separately. [BZ #2542] [BZ #2543] [BZ #2558] * sysdeps/ieee754/dbl-64/e_lgamma_r.c (__ieee754_lgamma_r): Call __lgamma_neg for arguments from -28.0 to -2.0. * sysdeps/ieee754/flt-32/e_lgammaf_r.c (__ieee754_lgammaf_r): Call __lgamma_negf for arguments from -15.0 to -2.0. * sysdeps/ieee754/ldbl-128/e_lgammal_r.c (__ieee754_lgammal_r): Call __lgamma_negl for arguments from -48.0 or -50.0 to -2.0. * sysdeps/ieee754/ldbl-96/e_lgammal_r.c (__ieee754_lgammal_r): Call __lgamma_negl for arguments from -33.0 to -2.0. * sysdeps/ieee754/dbl-64/lgamma_neg.c: New file. * sysdeps/ieee754/dbl-64/lgamma_product.c: Likewise. * sysdeps/ieee754/flt-32/lgamma_negf.c: Likewise. * sysdeps/ieee754/flt-32/lgamma_productf.c: Likewise. * sysdeps/ieee754/ldbl-128/lgamma_negl.c: Likewise. * sysdeps/ieee754/ldbl-128/lgamma_productl.c: Likewise. * sysdeps/ieee754/ldbl-128ibm/lgamma_negl.c: Likewise. * sysdeps/ieee754/ldbl-128ibm/lgamma_productl.c: Likewise. * sysdeps/ieee754/ldbl-96/lgamma_negl.c: Likewise. * sysdeps/ieee754/ldbl-96/lgamma_product.c: Likewise. * sysdeps/ieee754/ldbl-96/lgamma_productl.c: Likewise. * sysdeps/generic/math_private.h (__lgamma_negf): New prototype. (__lgamma_neg): Likewise. (__lgamma_negl): Likewise. (__lgamma_product): Likewise. (__lgamma_productl): Likewise. * math/Makefile (libm-calls): Add lgamma_neg and lgamma_product. * math/auto-libm-test-in: Add more tests of lgamma. * math/auto-libm-test-out: Regenerated. * sysdeps/i386/fpu/libm-test-ulps: Update. * sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-09-08Move bits/libc-lock.h and bits/libc-lockP.h out of bits/ (bug 14912).Joseph Myers
It was noted in <https://sourceware.org/ml/libc-alpha/2012-09/msg00305.html> that the bits/*.h naming scheme should only be used for installed headers. This patch renames bits/libc-lock.h to plain libc-lock.h and bits/libc-lockP.h to plain libc-lockP.h to follow that convention. Note that I don't know where libc-lockP.h comes from for Hurd (the Hurd libc-lock.h includes libc-lockP.h, but the only libc-lockP.h in the glibc source tree is for NPTL) - some unmerged patch? - but I updated the #include in the Hurd libc-lock.h anyway. Tested for x86_64 (testsuite, and that installed stripped shared libraries are unchanged by the patch). [BZ #14912] * bits/libc-lock.h: Move to ... * sysdeps/generic/libc-lock.h: ...here. (_BITS_LIBC_LOCK_H): Rename macro to _LIBC_LOCK_H. * sysdeps/mach/hurd/bits/libc-lock.h: Move to ... * sysdeps/mach/hurd/libc-lock.h: ...here. (_BITS_LIBC_LOCK_H): Rename macro to _LIBC_LOCK_H. [_LIBC]: Include <libc-lockP.h> instead of <bits/libc-lockP.h>. * sysdeps/mach/bits/libc-lock.h: Move to ... * sysdeps/mach/libc-lock.h: ...here. (_BITS_LIBC_LOCK_H): Rename macro to _LIBC_LOCK_H. * sysdeps/nptl/bits/libc-lock.h: Move to ... * sysdeps/nptl/libc-lock.h: ...here. (_BITS_LIBC_LOCK_H): Rename macro to _LIBC_LOCK_H. * sysdeps/nptl/bits/libc-lockP.h: Move to ... * sysdeps/nptl/libc-lockP.h: ...here. (_BITS_LIBC_LOCKP_H): Rename macro to _LIBC_LOCKP_H. * crypt/crypt_util.c: Include <libc-lock.h> instead of <bits/libc-lock.h>. * dirent/scandir-tail.c: Likewise. * dlfcn/dlerror.c: Likewise. * elf/dl-close.c: Likewise. * elf/dl-iteratephdr.c: Likewise. * elf/dl-lookup.c: Likewise. * elf/dl-open.c: Likewise. * elf/dl-support.c: Likewise. * elf/dl-writev.h: Likewise. * elf/rtld.c: Likewise. * grp/fgetgrent.c: Likewise. * gshadow/fgetsgent.c: Likewise. * gshadow/sgetsgent.c: Likewise. * iconv/gconv_conf.c: Likewise. * iconv/gconv_db.c: Likewise. * iconv/gconv_dl.c: Likewise. * iconv/gconv_int.h: Likewise. * iconv/gconv_trans.c: Likewise. * include/link.h: Likewise. * inet/getnameinfo.c: Likewise. * inet/getnetgrent.c: Likewise. * inet/getnetgrent_r.c: Likewise. * intl/bindtextdom.c: Likewise. * intl/dcigettext.c: Likewise. * intl/finddomain.c: Likewise. * intl/gettextP.h: Likewise. * intl/loadmsgcat.c: Likewise. * intl/localealias.c: Likewise. * intl/textdomain.c: Likewise. * libidn/idn-stub.c: Likewise. * libio/libioP.h: Likewise. * locale/duplocale.c: Likewise. * locale/freelocale.c: Likewise. * locale/newlocale.c: Likewise. * locale/setlocale.c: Likewise. * login/getutent_r.c: Likewise. * login/getutid_r.c: Likewise. * login/getutline_r.c: Likewise. * login/utmp-private.h: Likewise. * login/utmpname.c: Likewise. * malloc/mtrace.c: Likewise. * misc/efgcvt.c: Likewise. * misc/error.c: Likewise. * misc/fstab.c: Likewise. * misc/getpass.c: Likewise. * misc/mntent.c: Likewise. * misc/syslog.c: Likewise. * nis/nis_call.c: Likewise. * nis/nis_callback.c: Likewise. * nis/nss-default.c: Likewise. * nis/nss_compat/compat-grp.c: Likewise. * nis/nss_compat/compat-initgroups.c: Likewise. * nis/nss_compat/compat-pwd.c: Likewise. * nis/nss_compat/compat-spwd.c: Likewise. * nis/nss_nis/nis-alias.c: Likewise. * nis/nss_nis/nis-ethers.c: Likewise. * nis/nss_nis/nis-grp.c: Likewise. * nis/nss_nis/nis-hosts.c: Likewise. * nis/nss_nis/nis-network.c: Likewise. * nis/nss_nis/nis-proto.c: Likewise. * nis/nss_nis/nis-pwd.c: Likewise. * nis/nss_nis/nis-rpc.c: Likewise. * nis/nss_nis/nis-service.c: Likewise. * nis/nss_nis/nis-spwd.c: Likewise. * nis/nss_nisplus/nisplus-alias.c: Likewise. * nis/nss_nisplus/nisplus-ethers.c: Likewise. * nis/nss_nisplus/nisplus-grp.c: Likewise. * nis/nss_nisplus/nisplus-hosts.c: Likewise. * nis/nss_nisplus/nisplus-initgroups.c: Likewise. * nis/nss_nisplus/nisplus-network.c: Likewise. * nis/nss_nisplus/nisplus-proto.c: Likewise. * nis/nss_nisplus/nisplus-pwd.c: Likewise. * nis/nss_nisplus/nisplus-rpc.c: Likewise. * nis/nss_nisplus/nisplus-service.c: Likewise. * nis/nss_nisplus/nisplus-spwd.c: Likewise. * nis/ypclnt.c: Likewise. * nptl/libc_pthread_init.c: Likewise. * nss/getXXbyYY.c: Likewise. * nss/getXXent.c: Likewise. * nss/getXXent_r.c: Likewise. * nss/nss_db/db-XXX.c: Likewise. * nss/nss_db/db-netgrp.c: Likewise. * nss/nss_db/nss_db.h: Likewise. * nss/nss_files/files-XXX.c: Likewise. * nss/nss_files/files-alias.c: Likewise. * nss/nsswitch.c: Likewise. * posix/regex_internal.h: Likewise. * posix/wordexp.c: Likewise. * pwd/fgetpwent.c: Likewise. * resolv/res_hconf.c: Likewise. * resolv/res_libc.c: Likewise. * shadow/fgetspent.c: Likewise. * shadow/lckpwdf.c: Likewise. * shadow/sgetspent.c: Likewise. * socket/opensock.c: Likewise. * stdio-common/reg-modifier.c: Likewise. * stdio-common/reg-printf.c: Likewise. * stdio-common/reg-type.c: Likewise. * stdio-common/vfprintf.c: Likewise. * stdio-common/vfscanf.c: Likewise. * stdlib/abort.c: Likewise. * stdlib/cxa_atexit.c: Likewise. * stdlib/fmtmsg.c: Likewise. * stdlib/random.c: Likewise. * stdlib/setenv.c: Likewise. * string/strsignal.c: Likewise. * sunrpc/auth_none.c: Likewise. * sunrpc/bindrsvprt.c: Likewise. * sunrpc/create_xid.c: Likewise. * sunrpc/key_call.c: Likewise. * sunrpc/rpc_thread.c: Likewise. * sysdeps/arm/backtrace.c: Likewise. * sysdeps/generic/ldsodefs.h: Likewise. * sysdeps/generic/stdio-lock.h: Likewise. * sysdeps/generic/unwind-dw2-fde.c: Likewise. * sysdeps/i386/backtrace.c: Likewise. * sysdeps/ieee754/ldbl-opt/nldbl-compat.c: Likewise. * sysdeps/m68k/backtrace.c: Likewise. * sysdeps/mach/hurd/cthreads.c: Likewise. * sysdeps/mach/hurd/dirstream.h: Likewise. * sysdeps/mach/hurd/malloc-machine.h: Likewise. * sysdeps/nptl/malloc-machine.h: Likewise. * sysdeps/nptl/stdio-lock.h: Likewise. * sysdeps/posix/dirstream.h: Likewise. * sysdeps/posix/getaddrinfo.c: Likewise. * sysdeps/posix/system.c: Likewise. * sysdeps/pthread/aio_suspend.c: Likewise. * sysdeps/s390/s390-32/backtrace.c: Likewise. * sysdeps/s390/s390-64/backtrace.c: Likewise. * sysdeps/unix/sysv/linux/check_pf.c: Likewise. * sysdeps/unix/sysv/linux/if_index.c: Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/getutent_r.c: Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/getutid_r.c: Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/getutline_r.c: Likewise. * sysdeps/unix/sysv/linux/shm-directory.c: Likewise. * sysdeps/unix/sysv/linux/system.c: Likewise. * sysdeps/x86_64/backtrace.c: Likewise. * time/alt_digit.c: Likewise. * time/era.c: Likewise. * time/tzset.c: Likewise. * wcsmbs/wcsmbsload.c: Likewise. * nptl/tst-initializers1.c (do_test): Refer to <libc-lock.h> instead of <bits/libc-lock.h> in comment.
2015-08-27Detect and select i586/i686 implementation at run-timefedora/masterH.J. Lu
We detect i586 and i686 features at run-time by checking CX8 and CMOV CPUID features bits. We can use these information to select the best implementation in ix86 multiarch. HAS_I586/HAS_I686 is true if i586/i686 instructions are available on the processor. Due to the reordering and the other nifty extensions in i686, it is not really good to use heavily i586 optimized code on an i686. It's better to use i486 code if it isn't an i586. USE_I586/USE_I686 is true if i586/i686 implementation should be used for the processor. USE_I586 is true only if i686 instructions aren't available. If i686 instructions are available, we always choose i686 or i486 implementation, in that order, and we never choose i586 implementation for i686-class processors. * sysdeps/i386/init-arch.h: New file. * sysdeps/i386/i586/init-arch.h: Likewise. * sysdeps/i386/i686/init-arch.h: Likewise. * sysdeps/x86/cpu-features.c (init_cpu_features): Set bit_I586 bit if CX8 is available. Set bit_I686 bit if CMOV is available. * sysdeps/x86/cpu-features.h (bit_I586): New. (bit_I686): Likewise. (bit_CX8): Likewise. (bit_CMOV): Likewise. (index_CX8): Likewise. (index_CMOV): Likewise. (index_I586): Likewise. (index_I686): Likewise. (reg_CX8): Likewise. (reg_CMOV): Likewise. (HAS_I586): Defined as HAS_ARCH_FEATURE (I586) if i586 isn't available at compile-time. (HAS_I686): Defined as HAS_ARCH_FEATURE (I686) if i686 isn't available at compile-time. * sysdeps/x86/init-arch.h (USE_I586): New macro. (USE_I686): Likewise.
2015-08-27Add i386 memset and memcpy assembly functionsH.J. Lu
Add i386 memset and memcpy assembly functions with REP MOVSB/STOSB instructions. * sysdeps/i386/bcopy.S: New file. * sysdeps/i386/bzero.S: Likewise. * sysdeps/i386/memcpy.S: Likewise. * sysdeps/i386/memmove.S: Likewise. * sysdeps/i386/mempcpy.S: Likewise. * sysdeps/i386/memset.S: Likewise. * sysdeps/i386/bzero.c: Removed. * sysdeps/i386/memset.c: Likewise. * sysdeps/i386/i586/memcpy_chk.S: Likewise. * sysdeps/i386/i586/mempcpy_chk.S: Likewise. * sysdeps/i386/i586/memset_chk.S: Likewise. * sysdeps/i386/i686/memcpy_chk.S: Moved to ... * sysdeps/i386/memcpy_chk.S: Here. * sysdeps/i386/i686/memmove_chk.S: Moved to ... * sysdeps/i386/memmove_chk.S: Here. * sysdeps/i386/i686/mempcpy_chk.S: Moved to ... * sysdeps/i386/mempcpy_chk.S: Likewise. * sysdeps/i386/i686/memset_chk.S: Moved to ... * sysdeps/i386/memset_chk.S: Likewise.
2015-08-27Remove i486 subdirectoryH.J. Lu
Since glibc doesn't support i386 any more, we can remove i486 subdirectory. * sysdeps/i386/i586/Implies: Removed. * sysdeps/i386/i686/Implies: Likewise.
2015-08-27Move i486/strlen.S to strlen.SH.J. Lu
Since glibc doesn't support i386 any more, we can move i486/strlen.S to strlen.S. * sysdeps/i386/i486/strlen.S: Moved to ... * sysdeps/i386/strlen.S: Here.
2015-08-27Move i486/strcat.S to strcat.SH.J. Lu
Since glibc doesn't support i386 any more, we can move i486/strcat.S to strcat.S. * sysdeps/i386/i486/strcat.S: Moved to ... * sysdeps/i386/strcat.S: Here. * sysdeps/i386/i686/multiarch/strcat.S: Updated.
2015-08-27Move i486/pthread_spin_trylock.S to pthread_spin_trylock.SH.J. Lu
Since glibc doesn't support i386 any more, we can move i486/pthread_spin_trylock.S to pthread_spin_trylock.S * sysdeps/i386/i486/pthread_spin_trylock.S: Moved to ... * sysdeps/i386/pthread_spin_trylock.S: Here. * sysdeps/i386/i586/pthread_spin_trylock.S: Removed. * sysdeps/i386/i686/pthread_spin_trylock.S: Updated.
2015-08-27Move i486/string-inlines.c to string-inlines.cH.J. Lu
Since glibc doesn't support i386 any more, we can move i486/string-inlines.c to string-inlines.c. * sysdeps/i386/i486/string-inlines.c: Moved to ... * sysdeps/i386/string-inlines.c: Here.
2015-08-27Move i486/htonl.S to htonl.SH.J. Lu
Since glibc doesn't support i386 any more, we can move i486/htonl.S to htonl.S. * sysdeps/i386/i486/htonl.S: Moved ... * sysdeps/i386/htonl.S: here.
2015-08-27Move i486/bits/atomic.h to bits/atomic.hH.J. Lu
Since glibc doesn't support i386 any more, we can move i486/bits/atomic.h to bits/atomic.h. * sysdeps/i386/i486/bits/atomic.h: Moved to ... * sysdeps/i386/bits/atomic.h: Here.
2015-08-27Remove sysdeps/i386/i486/VersionsH.J. Lu
sysdeps/i386/i486/Versions isn't needed since it duplicates contents in sysdeps/i386/Versions. * sysdeps/i386/i486/Versions: Removed.
2015-08-26Replace BZERO_P/PIC with USE_AS_BZERO/SHAREDH.J. Lu
Replace BZERO_P with USE_AS_BZERO in i586/i686 memset.S to support i386 multi-arch memset. Also we should check SHARED not PIC for libc.so since libc.a may be compiled with PIC. * sysdeps/i386/i586/bzero.S (USE_AS_BZERO): New. * sysdeps/i386/i686/bzero.S (USE_AS_BZERO): Likewise. * sysdeps/i386/i586/memset.S (BZERO_P): Removed. Check USE_AS_BZERO/SHARED instead of BZERO_P/PIC. (__memset_zero_constant_len_parameter): New. * sysdeps/i386/i686/memset.S (BZERO_P): Removed. Check USE_AS_BZERO/SHARED instead of BZERO_P/PIC. (__memset_zero_constant_len_parameter): Don't define if __memset_chk or USE_AS_BZERO are defined.
2015-08-26Replace MEMPCPY_P/PIC with USE_AS_MEMPCPY/SHAREDH.J. Lu
Replace MEMPCPY_P with USE_AS_MEMPCPY in i586 memcpy.S to support i386 multi-arch memcpy. Also we should check SHARED not PIC for libc.so since libc.a may be compiled with PIC. * sysdeps/i386/i586/memcpy.S (MEMPCPY_P): Removed. Check USE_AS_MEMPCPY/SHARED instead of MEMPCPY_P/PIC. * sysdeps/i386/i586/mempcpy.S (USE_AS_MEMPCPY): New.
2015-08-26Don't disable SSE in x86-64 ld.soH.J. Lu
Since x86-64 ld.so preserves vector registers now, we can use SSE in x86-64 ld.so. We should run tst-ld-sse-use.sh only on i386. * sysdeps/x86/Makefile [$(subdir) == elf] (CFLAGS-.os, tests-special, $(objpfx)tst-ld-sse-use.out): Moved to ... * sysdeps/i386/Makefile [$(subdir) == elf] (CFLAGS-.os, tests-special, $(objpfx)tst-ld-sse-use.out): Here. Update comments. * sysdeps/x86_64/Makefile [$(subdir) == elf] (CFLAGS-.os): Add -mno-mmx for $(all-rtld-routines). * sysdeps/x86/tst-ld-sse-use.sh: Moved to ... * sysdeps/i386/tst-ld-sse-use.sh: Here. Replace x86-64 with i386.
2015-08-20Remove the unused IFUNC filesH.J. Lu
sysdeps/i386/i686/multiarch/strcasestr-c.c became unused after commit 1818483b15d22016b0eae41d37ee91cc87b37510 Author: Andreas Schwab <schwab@suse.de> Date: Wed Dec 18 11:53:27 2013 +1000 Remove use of SSE4.2 functions for strstr on i686 which contains -sysdep_routines += strcspn-c strpbrk-c strspn-c strstr-c strcasestr-c +sysdep_routines += strcspn-c strpbrk-c strspn-c sysdeps/x86_64/multiarch/strcasestr.c became useless after t 584b18eb4df61ccd447db2dfe8c8a7901f8c8598 Author: Ondřej Bílka <neleai@seznam.cz> Date: Sat Dec 14 19:33:56 2013 +0100 Add strstr with unaligned loads. Fixes bug 12100. which changes sysdeps/x86_64/multiarch/strcasestr.c to libc_ifunc (__strcasestr, __strcasestr_sse2); This patch removes these file. * i386/i686/multiarch/strcasestr-c.c: Removed. * x86_64/multiarch/strcasestr.c: Likewise. * x86_64/multiarch/ifunc-impl-list.c (__libc_ifunc_impl_list): Remove strcasestr.
2015-08-20Move x86_64 init-arch.h to sysdeps/x86/init-arch.hH.J. Lu
Move sysdeps/x86_64/multiarch/init-arch.h to sysdeps/x86/init-arch.h which can be used for both i386 and x86_64. * sysdeps/i386/i686/multiarch/init-arch.h: Removed. * sysdeps/unix/sysv/linux/x86/init-arch.h: Likewise. * sysdeps/x86_64/cacheinfo.c: Include <init-arch.h> instead of "multiarch/init-arch.h". * sysdeps/x86_64/multiarch/init-arch.h: Renamed to ... * sysdeps/x86/init-arch.h: This.
2015-08-20Remove x86 init-arch.cH.J. Lu
Both files include sysdeps/x86_64/multiarch/init-arch.c which has been removed. * sysdeps/i386/i686/multiarch/init-arch.c: Removed. * sysdeps/unix/sysv/linux/x86/init-arch.c: Likewise.
2015-08-19Fix csqrt missing underflows (bug 18370).Joseph Myers
The csqrt implementations in glibc can miss underflow exceptions when the real or imaginary part of the result becomes tiny in the course of scaling down (in particular, multiplication by 0.5) and that scaling is exact although the relevant part of the mathematical result isn't. This patch forces the exception in a similar way to previous fixes. Tested for x86_64 and x86. [BZ #18370] * math/s_csqrt.c (__csqrt): Force underflow exception for results whose real or imaginary part has small absolute value. * math/s_csqrtf.c (__csqrtf): Likewise. * math/s_csqrtl.c (__csqrtl): Likewise. * math/auto-libm-test-in: Add more tests of csqrt. * math/auto-libm-test-out: Regenerated. * sysdeps/i386/fpu/libm-test-ulps: Update.
2015-08-19Use x86-64 cacheinfo.c and sysconf.c for x86H.J. Lu
Since _dl_x86_cpu_features is always available, we can use x86-64 cacheinfo.c and sysconf.c for both i386 and x86-64. * sysdeps/i386/i686/Makefile [$(subdir) == string] (sysdep_routines): Moved to ... * sysdeps/i386/Makefile: Here. * sysdeps/i386/i686/cacheinfo.c: Moved to ... * sysdeps/i386/cacheinfo.c: Here. * sysdeps/unix/sysv/linux/i386/sysconf.c: Removed. * sysdeps/unix/sysv/linux/i386/i686/sysconf.c: Likewise. * sysdeps/unix/sysv/linux/x86_64/sysconf.c: Moved to ... * sysdeps/unix/sysv/linux/x86/sysconf.c: Here.
2015-08-15Fix BZ #18084 -- backtrace (..., 0) dumps core on x86.Paul Pluzhnikov
Other architectures also had bugs, or did unnecessary work.
2015-08-13Add more random libm-test inputs.Joseph Myers
This patch adds more test inputs to various libm functions found through random generation to have larger ulps errors than previously listed in libm-test-ulp, on at least one of x86_64 and x86. Tested for x86_64 and x86. * math/auto-libm-test-in: Add more tests of acos, acosh, asin, asinh, atan, atan2, atanh, cabs, cbrt, cosh, csqrt, erf, erfc, exp, exp2, lgamma, log, log1p, log2, pow, sin, sincos, tan, tanh and tgamma. * math/auto-libm-test-out: Regenerated. * sysdeps/i386/fpu/libm-test-ulps: Update. * sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-08-13Fix tanh missing underflows (bug 16520).Joseph Myers
Similar to various other bugs in this area, some tanh implementations do not raise the underflow exception for subnormal arguments, when the result is tiny and inexact. This patch forces the exception in a similar way to previous fixes. Tested for x86_64, x86, mips64 and powerpc. [BZ #16520] * sysdeps/ieee754/dbl-64/s_tanh.c: Include <float.h>. (__tanh): Force underflow exception for arguments with small absolute value. * sysdeps/ieee754/flt-32/s_tanhf.c: Include <float.h>. (__tanhf): Force underflow exception for arguments with small absolute value. * sysdeps/ieee754/ldbl-128/s_tanhl.c: Include <float.h>. (__tanhl): Force underflow exception for arguments with small absolute value. * sysdeps/ieee754/ldbl-128ibm/s_tanhl.c: Include <float.h>. (__tanhl): Force underflow exception for arguments with small absolute value. * sysdeps/ieee754/ldbl-96/s_tanhl.c: Include <float.h>. (__tanhl): Force underflow exception for arguments with small absolute value. * math/auto-libm-test-in: Add more tests of tanh. * math/auto-libm-test-out: Regenerated. * sysdeps/i386/fpu/libm-test-ulps: Update.
2015-08-13Update i686 multiarch functions for <cpu-features.h>H.J. Lu
This patch updates i686 multiarch functions to use the newly defined HAS_CPU_FEATURE, HAS_ARCH_FEATURE, LOAD_GOT_AND_RTLD_GLOBAL_RO and LOAD_FUNC_GOT_EAX from <cpu-features.h>. * sysdeps/i386/i686/fpu/multiarch/e_expf.c: Replace HAS_XXX with HAS_CPU_FEATURE/HAS_ARCH_FEATURE (XXX). * sysdeps/i386/i686/fpu/multiarch/s_cosf.c: Likewise. * sysdeps/i386/i686/fpu/multiarch/s_cosf.c: Likewise. * sysdeps/i386/i686/fpu/multiarch/s_sincosf.c: Likewise. * sysdeps/i386/i686/fpu/multiarch/s_sinf.c: Likewise. * sysdeps/i386/i686/multiarch/ifunc-impl-list.c: Likewise. * sysdeps/i386/i686/multiarch/s_fma.c: Likewise. * sysdeps/i386/i686/multiarch/s_fmaf.c: Likewise. * sysdeps/i386/i686/multiarch/bcopy.S: Remove __init_cpu_features call. Merge SHARED and !SHARED. Add LOAD_GOT_AND_RTLD_GLOBAL_RO. Use LOAD_FUNC_GOT_EAX to load function address. Replace HAS_XXX with HAS_CPU_FEATURE/HAS_ARCH_FEATURE (XXX). * sysdeps/i386/i686/multiarch/bzero.S: Likewise. * sysdeps/i386/i686/multiarch/memchr.S: Likewise. * sysdeps/i386/i686/multiarch/memcmp.S: Likewise. * sysdeps/i386/i686/multiarch/memcpy.S: Likewise. * sysdeps/i386/i686/multiarch/memcpy_chk.S: Likewise. * sysdeps/i386/i686/multiarch/memmove.S: Likewise. * sysdeps/i386/i686/multiarch/memmove_chk.S: Likewise. * sysdeps/i386/i686/multiarch/mempcpy.S: Likewise. * sysdeps/i386/i686/multiarch/mempcpy_chk.S: Likewise. * sysdeps/i386/i686/multiarch/memrchr.S: Likewise. * sysdeps/i386/i686/multiarch/memset.S: Likewise. * sysdeps/i386/i686/multiarch/memset_chk.S: Likewise. * sysdeps/i386/i686/multiarch/rawmemchr.S: Likewise. * sysdeps/i386/i686/multiarch/strcasecmp.S: Likewise. * sysdeps/i386/i686/multiarch/strcat.S: Likewise. * sysdeps/i386/i686/multiarch/strchr.S: Likewise. * sysdeps/i386/i686/multiarch/strcmp.S: Likewise. * sysdeps/i386/i686/multiarch/strcpy.S: Likewise. * sysdeps/i386/i686/multiarch/strcspn.S: Likewise. * sysdeps/i386/i686/multiarch/strlen.S: Likewise. * sysdeps/i386/i686/multiarch/strncase.S: Likewise. * sysdeps/i386/i686/multiarch/strnlen.S: Likewise. * sysdeps/i386/i686/multiarch/strrchr.S: Likewise. * sysdeps/i386/i686/multiarch/strspn.S: Likewise. * sysdeps/i386/i686/multiarch/wcschr.S: Likewise. * sysdeps/i386/i686/multiarch/wcscmp.S: Likewise. * sysdeps/i386/i686/multiarch/wcscpy.S: Likewise. * sysdeps/i386/i686/multiarch/wcslen.S: Likewise. * sysdeps/i386/i686/multiarch/wcsrchr.S: Likewise. * sysdeps/i386/i686/multiarch/wmemcmp.S: Likewise.
2015-08-13Add _dl_x86_cpu_features to rtld_globalH.J. Lu
This patch adds _dl_x86_cpu_features to rtld_global in x86 ld.so and initializes it early before __libc_start_main is called so that cpu_features is always available when it is used and we can avoid calling __init_cpu_features in IFUNC selectors. * sysdeps/i386/dl-machine.h: Include <cpu-features.c>. (dl_platform_init): Call init_cpu_features. * sysdeps/i386/dl-procinfo.c (_dl_x86_cpu_features): New. * sysdeps/i386/i686/cacheinfo.c (DISABLE_PREFERRED_MEMORY_INSTRUCTION): Removed. * sysdeps/i386/i686/multiarch/Makefile (aux): Remove init-arch. * sysdeps/i386/i686/multiarch/Versions: Removed. * sysdeps/i386/i686/multiarch/ifunc-defines.sym (KIND_OFFSET): Removed. * sysdeps/i386/ldsodefs.h: Include <cpu-features.h>. * sysdeps/unix/sysv/linux/x86/Makefile (libpthread-sysdep_routines): Remove init-arch. * sysdeps/unix/sysv/linux/x86_64/dl-procinfo.c: Include <sysdeps/x86_64/dl-procinfo.c> instead of sysdeps/generic/dl-procinfo.c>. * sysdeps/x86/Makefile [$(subdir) == csu] (gen-as-const-headers): Add cpu-features-offsets.sym and rtld-global-offsets.sym. [$(subdir) == elf] (sysdep-dl-routines): Add dl-get-cpu-features. [$(subdir) == elf] (tests): Add tst-get-cpu-features. [$(subdir) == elf] (tests-static): Add tst-get-cpu-features-static. * sysdeps/x86/Versions: New file. * sysdeps/x86/cpu-features-offsets.sym: Likewise. * sysdeps/x86/cpu-features.c: Likewise. * sysdeps/x86/cpu-features.h: Likewise. * sysdeps/x86/dl-get-cpu-features.c: Likewise. * sysdeps/x86/libc-start.c: Likewise. * sysdeps/x86/rtld-global-offsets.sym: Likewise. * sysdeps/x86/tst-get-cpu-features-static.c: Likewise. * sysdeps/x86/tst-get-cpu-features.c: Likewise. * sysdeps/x86_64/dl-procinfo.c: Likewise. * sysdeps/x86_64/cacheinfo.c (__cpuid_count): Removed. Assume USE_MULTIARCH is defined and don't check it. (is_intel): Replace __cpu_features with GLRO(dl_x86_cpu_features). (is_amd): Likewise. (max_cpuid): Likewise. (intel_check_word): Likewise. (__cache_sysconf): Don't call __init_cpu_features. (__x86_preferred_memory_instruction): Removed. (init_cacheinfo): Don't call __init_cpu_features. Replace __cpu_features with GLRO(dl_x86_cpu_features). * sysdeps/x86_64/dl-machine.h: <cpu-features.c>. (dl_platform_init): Call init_cpu_features. * sysdeps/x86_64/ldsodefs.h: Include <cpu-features.h>. * sysdeps/x86_64/multiarch/Makefile (aux): Remove init-arch. * sysdeps/x86_64/multiarch/Versions: Removed. * sysdeps/x86_64/multiarch/cacheinfo.c: Likewise. * sysdeps/x86_64/multiarch/init-arch.c: Likewise. * sysdeps/x86_64/multiarch/ifunc-defines.sym (KIND_OFFSET): Removed. * sysdeps/x86_64/multiarch/init-arch.h: Rewrite.
2015-08-11Add more tests of various libm functions.Joseph Myers
This patch adds more tests of various libm functions found through random test generation to give increased ulps on 32-bit x86. Tested for x86_64 and x86. * math/auto-libm-test-in: Add more tests of acosh, asin, asinh, atanh, cabs, carg, cbrt, cosh, csqrt, erf, erfc, exp, exp10, expm1, hypot, log, log10, log1p, log2, pow, sinh, tan and tgamma. * math/auto-libm-test-out: Regenerated. * sysdeps/i386/fpu/libm-test-ulps: Update. * sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-08-10Fix ldbl-128ibm tanhl inaccuracy (bug 18790).Joseph Myers
ldbl-128ibm tanhl uses a too-small threshold to decide when to return +/-1, resulting in large errors. This patch changes it to a more appropriate threshold (the requirement is for 2*exp(-2|x|) to be small in terms of ulps of 1). Tested for x86_64, x86 and powerpc. [BZ #18790] * sysdeps/ieee754/ldbl-128ibm/s_tanhl.c (__tanhl): Increase threshold for returning +/- 1. * math/auto-libm-test-in: Add more tests of tanh. * math/auto-libm-test-out: Regenerated. * sysdeps/i386/fpu/libm-test-ulps: Update.
2015-08-10Fix ldbl-128ibm sinhl inaccuracy near 0 (bug 18789).Joseph Myers
ldbl-128ibm sinhl uses a too-big threshold to decide when to return the argument, resulting in large errors. This patch fixes it to use a more appropriate threshold. Tested for x86_64, x86 and powerpc. [BZ #18789] * sysdeps/ieee754/ldbl-128ibm/e_sinhl.c (__ieee754_sinhl): Use smaller threshold for returning the argument. * math/auto-libm-test-in: Add more tests of sinh. * math/auto-libm-test-out: Regenerated. * sysdeps/i386/fpu/libm-test-ulps: Update.
2015-08-09Add a missing break in tst-auditmod3b.cH.J. Lu
[BZ #18674] * sysdeps/i386/tst-auditmod3b.c (la_objsearch): Add a missing break.
2015-08-06Fix sinh missing underflows (bug 16519).Joseph Myers
Similar to various other bugs in this area, some sinh implementations do not raise the underflow exception for subnormal arguments, when the result is tiny and inexact. This patch forces the exception in a similar way to previous fixes. Tested for x86_64, x86, mips64 and powerpc. [BZ #16519] * sysdeps/ieee754/dbl-64/e_sinh.c: Include <float.h>. (__ieee754_sinh): Force underflow exception for arguments with small absolute value. * sysdeps/ieee754/flt-32/e_sinhf.c: Include <float.h>. (__ieee754_sinhf): Force underflow exception for arguments with small absolute value. * sysdeps/ieee754/ldbl-128/e_sinhl.c: Include <float.h>. (__ieee754_sinhl): Force underflow exception for arguments with small absolute value. * sysdeps/ieee754/ldbl-128ibm/e_sinhl.c: Include <float.h>. (__ieee754_sinhl): Force underflow exception for arguments with small absolute value. * sysdeps/ieee754/ldbl-96/e_sinhl.c: Include <float.h>. (__ieee754_sinhl): Force underflow exception for arguments with small absolute value. * math/auto-libm-test-in: Add more tests of sinh. * math/auto-libm-test-out: Regenerated. * sysdeps/i386/fpu/libm-test-ulps: Update.
2015-08-04Properly terminate FDE in makecontext for ix86 (bug 18635)Andreas Schwab
2015-07-15i686: Mark stdlib/tst-makecontext as XFAIL.Stefan Liebler
The testcase stdlib/tst-makecontext fails on i686 because _Unwind_Backtrace from libgcc produces a segmentation fault if it was called within a context created by makecontext. See Bug 18635. ChangeLog: * sysdeps/i386/i686/Makefile (test-xfail-tst-makecontext): New variable.
2015-07-09Preserve bound registers for pointer pass/returnIgor Zamyatin
We need to save/restore bound registers and add a BND prefix before branches in _dl_runtime_profile so that bound registers for pointer pass and return are preserved when LD_AUDIT is used. [BZ #18134] * sysdeps/i386/configure.ac: Set HAVE_MPX_SUPPORT. * sysdeps/i386/configure: Regenerated. * sysdeps/i386/dl-trampoline.S (PRESERVE_BND_REGS_PREFIX): New. (_dl_runtime_profile): Save and restore Intel MPX return bound registers when calling _dl_call_pltexit. Add PRESERVE_BND_REGS_PREFIX before return. * sysdeps/i386/link-defines.sym (LRV_BND0_OFFSET): New. (LRV_BND1_OFFSET): Likewise. * sysdeps/x86/bits/link.h (La_i86_retval): Add lrv_bnd0 and lrv_bnd1. * sysdeps/x86_64/dl-trampoline.S (_dl_runtime_profile): Fix typo in bndmov encoding. * sysdeps/x86_64/dl-trampoline.h: Properly save and restore Intel MPX bound registers. Add PRESERVE_BND_REGS_PREFIX before branch instructions to preserve bounds.
2015-07-07Add and use sysdeps/i386/link-defines.symH.J. Lu
Define macros for fields in La_i86_regs and La_i86_retval and use them in dl-trampoline.S, instead of hardcoded values. * sysdeps/i386/Makefile (gen-as-const-headers)[elf]: Add link-defines.sym. * sysdeps/i386/dl-trampoline.S: Include <link-defines.h>. (_dl_runtime_profile): Use LONG_DOUBLE_SIZE, LRV_SIZE, LRV_EAX_OFFSET, LRV_EDX_OFFSET, LRV_ST0_OFFSET, LRV_ST1_OFFSET and LR_SIZE. * sysdeps/i386/link-defines.sym: New file.
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