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authorJoseph Myers <joseph@codesourcery.com>2016-12-02 01:42:49 +0000
committerJoseph Myers <joseph@codesourcery.com>2016-12-02 01:42:49 +0000
commit55a38f82369669e181a05bcf2ac6c647dcd9b261 (patch)
tree5ecf72dbb2673caa4e87a91b46fdc9a3af66db7d /math/bits
parent6dc07416777012947152edaf5b7848c9e62c2fc8 (diff)
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Add llogb, llogbf, llogbl.
TS 18661-1 defines llogb functions that are like ilogb except that they return long int instead of int. Corresponding FP_LLOGB* macros are defined, whose values are required to have the obvious correspondence to those of the FP_ILOGB* macros. This patch implements these functions and macros for glibc. llogb uses the type-generic infrastructure, with an implementation similar to the wrapper for ilogb but with additional conversion from FP_ILOGB* to FP_LLOGB*; this approach avoids needing to modify or duplicate any of the architecture-specific ilogb implementations. Tests are also based on those for ilogb. Ideally the llogb functions would alias the ilogb ones when long is 32-bit, but such aliasing requires the associated header declarations of the different-type alias to be hidden, typically by defining macros before including the header (see e.g. how sysdeps/ieee754/dbl-64/wordsize-64/s_llround.c defines lround to __hidden_lround before including <math.h>). The infrastructure for type-generic function implementations does not support defining such macros at present (since C code can't define a macro whose name is determined by other macros). So this patch leaves them as separate functions (similar to e.g. scalbln and scalbn being separate in such a case as well), but with the remapping of FP_ILOGB* to FP_LLOGB* conditioned out in the case where it would be the identity map. Tested for x86_64, x86, mips64 and powerpc. * math/bits/mathcalls.h [__GLIBC_USE (IEC_60559_BFP_EXT)] (llogb): New declaration. * math/tgmath.h [__GLIBC_USE (IEC_60559_BFP_EXT)] (llogb): New macro. * math/math.h [__GLIBC_USE (IEC_60559_BFP_EXT)] (__FP_LONG_MAX): New macro. [__GLIBC_USE (IEC_60559_BFP_EXT)] (FP_LLOGB0): Likewise. [__GLIBC_USE (IEC_60559_BFP_EXT)] (FP_LLOGBNAN): Likewise. * math/Versions (llogb): New libm symbol at version GLIBC_2.25. (llogbf): Likewise. (llogbl): Likewise. * math/Makefile (gen-libm-calls): Add w_llogbF. (tests): Add test-fp-llogb-constants. * math/w_llogb_template.c: New file. Based on math/w_ilogb_template.c. * math/libm-test.inc (llogb_test_data): New array. (llogb_test): New function. (main): Call llogb_test. * math/test-fp-llogb-constants.c: New file. Based on math/test-fp-ilogb-constants.c. * math/test-tgmath-ret.c (llogb): New CHECK_RET_CONST call. (do_test): Call check_return_llogb. * math/test-tgmath.c (NCALLS): Increase to 126. (F(compile_test)): Call llogb. (F(llogb)): New function. * manual/math.texi (Exponents and Logarithms): Document llogb, llogbf, llogbl, FP_LLOGB0 and FP_LLOGBNAN. * manual/libm-err-tab.pl (@all_functions): Add llogb. * sysdeps/ieee754/ldbl-opt/nldbl-llogb.c: New file. * sysdeps/ieee754/ldbl-opt/w_llogbl.c: Likewise. * sysdeps/ieee754/ldbl-opt/Makefile (libnldbl-calls): Add llogb. (CFLAGS-nldbl-llogb.c): New variable. * sysdeps/nacl/libm.abilist: Update. * sysdeps/unix/sysv/linux/aarch64/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/alpha/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/arm/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/hppa/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/i386/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/ia64/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/microblaze/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/mips/mips32/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/nios2/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/sh/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/tile/tilepro/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/x86_64/64/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Likewise.
Diffstat (limited to 'math/bits')
-rw-r--r--math/bits/mathcalls.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/math/bits/mathcalls.h b/math/bits/mathcalls.h
index 54ea4b8f30..c57b5627cd 100644
--- a/math/bits/mathcalls.h
+++ b/math/bits/mathcalls.h
@@ -315,6 +315,11 @@ __MATHCALL (scalbn,, (_Mdouble_ __x, int __n));
__MATHDECL (int,ilogb,, (_Mdouble_ __x));
#endif
+#if __GLIBC_USE (IEC_60559_BFP_EXT)
+/* Like ilogb, but returning long int. */
+__MATHDECL (long int, llogb,, (_Mdouble_ __x));
+#endif
+
#ifdef __USE_ISOC99
/* Return X times (2 to the Nth power). */
__MATHCALL (scalbln,, (_Mdouble_ __x, long int __n));