diff options
| author | Joseph Myers <joseph@codesourcery.com> | 2016-11-23 17:56:31 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2016-11-23 17:56:31 +0000 |
| commit | 56ede9ed59684a5802cc88733055453901f1c2f0 (patch) | |
| tree | ed43ab94a24b3bfcd988feea8c031f47d013b27e /sysdeps/x86 | |
| parent | c650aa612ff622d843c6b6e5eeb183aae1a17eaa (diff) | |
| download | glibc-56ede9ed59684a5802cc88733055453901f1c2f0.tar glibc-56ede9ed59684a5802cc88733055453901f1c2f0.tar.gz glibc-56ede9ed59684a5802cc88733055453901f1c2f0.tar.bz2 glibc-56ede9ed59684a5802cc88733055453901f1c2f0.zip | |
Fix x86_64 -mfpmath=387 float_t, double_t (bug 20787).
Bug 20787 reports that, while float_t and double_t for 32-bit x86
properly respect -mfpmath=sse, for x86_64 they fail to reflect
-mfpmath=387, which is valid if unusual and results in FLT_EVAL_METHOD
being 2. This patch fixes the definitions to respect
__FLT_EVAL_METHOD__ in that case, arranging for the test that the
types correspond with FLT_EVAL_METHOD to be run with both -mfpmath=387
and -mfpmath=sse.
Note: this patch will also have the effect of making float_t and
double_t be long double for x86_64 with -mfpmath=sse+387, when
FLT_EVAL_METHOD is -1. It seems reasonable for x86_64 to be
consistent with 32-bit x86 in this case (and that definition is
conservatively safe, in that it makes the types correspond to the
widest evaluation format that might be used).
Tested for x86-64 and x86.
[BZ #20787]
* sysdeps/x86/bits/mathdef.h (float_t): Do not define to float if
[__x86_64__] when __FLT_EVAL_METHOD__ is nonzero.
(double_t): Do not define to double if [__x86_64__] when
__FLT_EVAL_METHOD__ is nonzero.
* sysdeps/x86/fpu/test-flt-eval-method-387.c: New file.
* sysdeps/x86/fpu/test-flt-eval-method-sse.c: Likewise.
* sysdeps/x86/fpu/Makefile [$(subdir) = math] (tests): Add
test-flt-eval-method-387 and test-flt-eval-method-sse.
[$(subdir) = math] (CFLAGS-test-flt-eval-method-387.c): New
variable.
[$(subdir) = math] (CFLAGS-test-flt-eval-method-sse.c): Likewise.
Diffstat (limited to 'sysdeps/x86')
| -rw-r--r-- | sysdeps/x86/bits/mathdef.h | 3 | ||||
| -rw-r--r-- | sysdeps/x86/fpu/Makefile | 6 | ||||
| -rw-r--r-- | sysdeps/x86/fpu/test-flt-eval-method-387.c | 1 | ||||
| -rw-r--r-- | sysdeps/x86/fpu/test-flt-eval-method-sse.c | 1 |
4 files changed, 9 insertions, 2 deletions
diff --git a/sysdeps/x86/bits/mathdef.h b/sysdeps/x86/bits/mathdef.h index e61c28aea3..9423a7f558 100644 --- a/sysdeps/x86/bits/mathdef.h +++ b/sysdeps/x86/bits/mathdef.h @@ -22,7 +22,8 @@ #if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF # define _MATH_H_MATHDEF 1 -# if defined __x86_64__ || (defined __FLT_EVAL_METHOD__ && __FLT_EVAL_METHOD__ == 0) +# if ((defined __x86_64__ && !defined __FLT_EVAL_METHOD__) \ + || (defined __FLT_EVAL_METHOD__ && __FLT_EVAL_METHOD__ == 0)) /* The x86-64 architecture computes values with the precission of the used type. Similarly for -m32 -mfpmath=sse. */ typedef float float_t; /* `float' expressions are evaluated as `float'. */ diff --git a/sysdeps/x86/fpu/Makefile b/sysdeps/x86/fpu/Makefile index b561995658..a8047a4504 100644 --- a/sysdeps/x86/fpu/Makefile +++ b/sysdeps/x86/fpu/Makefile @@ -1,7 +1,11 @@ ifeq ($(subdir),math) libm-support += powl_helper -tests += test-fenv-sse test-fenv-clear-sse test-fenv-x87 test-fenv-sse-2 +tests += test-fenv-sse test-fenv-clear-sse test-fenv-x87 test-fenv-sse-2 \ + test-flt-eval-method-387 test-flt-eval-method-sse CFLAGS-test-fenv-sse.c += -msse2 -mfpmath=sse CFLAGS-test-fenv-clear-sse.c += -msse2 -mfpmath=sse CFLAGS-test-fenv-sse-2.c += -msse2 -mfpmath=sse +CFLAGS-test-flt-eval-method-387.c += -fexcess-precision=standard -mfpmath=387 +CFLAGS-test-flt-eval-method-sse.c += -fexcess-precision=standard -msse2 \ + -mfpmath=sse endif diff --git a/sysdeps/x86/fpu/test-flt-eval-method-387.c b/sysdeps/x86/fpu/test-flt-eval-method-387.c new file mode 100644 index 0000000000..2fb7acfb76 --- /dev/null +++ b/sysdeps/x86/fpu/test-flt-eval-method-387.c @@ -0,0 +1 @@ +#include <test-flt-eval-method.c> diff --git a/sysdeps/x86/fpu/test-flt-eval-method-sse.c b/sysdeps/x86/fpu/test-flt-eval-method-sse.c new file mode 100644 index 0000000000..2fb7acfb76 --- /dev/null +++ b/sysdeps/x86/fpu/test-flt-eval-method-sse.c @@ -0,0 +1 @@ +#include <test-flt-eval-method.c> |