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| author | Joseph Myers <joseph@codesourcery.com> | 2015-09-24 16:48:32 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2015-09-24 16:48:32 +0000 |
| commit | 51df2605064a2bfd44fa0655ef9815812347de80 (patch) | |
| tree | a0abf7172d01f3766a34ccea0dbb5ea85703c42a /sysdeps/x86_64 | |
| parent | 24ffcbfc24e08212cc5b1fa8318940e75b06313c (diff) | |
| download | glibc-51df2605064a2bfd44fa0655ef9815812347de80.tar.gz glibc-51df2605064a2bfd44fa0655ef9815812347de80.tar.xz glibc-51df2605064a2bfd44fa0655ef9815812347de80.zip | |
Fix x86_64 fma4 pow inappropriate contraction (bug 19003).
The x86_64 fma4 version of pow fails to disable contraction of operations other than those explicitly intended to use fma instructions, so resulting in large ulps errors on processors with fma4 instructions, as in bug 18104 (165ulp for the test added for that bug; error originally reported by "blaaa" on #glibc). This patch adds $(config-cflags-nofma) for e_pow-fma4.c, corresponding to the use for e_pow.c in sysdeps/ieee754/dbl-64/Makefile. Tested for x86_64 on a processor with fma4. [BZ #19003] * sysdeps/x86_64/fpu/multiarch/Makefile (CFLAGS-e_pow-fma4.c): Add $(config-cflags-nofma).
Diffstat (limited to 'sysdeps/x86_64')
| -rw-r--r-- | sysdeps/x86_64/fpu/multiarch/Makefile | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sysdeps/x86_64/fpu/multiarch/Makefile b/sysdeps/x86_64/fpu/multiarch/Makefile index 86ea473b4f..631534a5ce 100644 --- a/sysdeps/x86_64/fpu/multiarch/Makefile +++ b/sysdeps/x86_64/fpu/multiarch/Makefile @@ -16,7 +16,7 @@ CFLAGS-e_asin-fma4.c = -mfma4 CFLAGS-e_atan2-fma4.c = -mfma4 CFLAGS-e_exp-fma4.c = -mfma4 CFLAGS-e_log-fma4.c = -mfma4 -CFLAGS-e_pow-fma4.c = -mfma4 +CFLAGS-e_pow-fma4.c = -mfma4 $(config-cflags-nofma) CFLAGS-halfulp-fma4.c = -mfma4 CFLAGS-mpa-fma4.c = -mfma4 CFLAGS-mpatan-fma4.c = -mfma4 |