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| 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/bits | |
| parent | c650aa612ff622d843c6b6e5eeb183aae1a17eaa (diff) | |
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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/bits')
| -rw-r--r-- | sysdeps/x86/bits/mathdef.h | 3 |
1 files changed, 2 insertions, 1 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'. */ |