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| author | Ulrich Drepper <drepper@gmail.com> | 2011-10-24 21:17:10 -0400 |
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| committer | Ulrich Drepper <drepper@gmail.com> | 2011-10-24 21:17:10 -0400 |
| commit | a0cf1edd4cf2b3bf1ec2f772b47c8eaafd899383 (patch) | |
| tree | 5d2d03ffdd10f0c59f64cb5ed7222081f5d91b83 | |
| parent | af968f62f24c5c0ef4e7e5ab41acae946908c112 (diff) | |
| download | glibc-a0cf1edd4cf2b3bf1ec2f772b47c8eaafd899383.tar.gz glibc-a0cf1edd4cf2b3bf1ec2f772b47c8eaafd899383.tar.xz glibc-a0cf1edd4cf2b3bf1ec2f772b47c8eaafd899383.zip | |
Use inline asm for DLA_FMS because of broken old compilers
| -rw-r--r-- | ChangeLog | 3 | ||||
| -rw-r--r-- | sysdeps/x86_64/dla.h | 8 |
2 files changed, 9 insertions, 2 deletions
diff --git a/ChangeLog b/ChangeLog index a2e155ab8c..108d9a96c3 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,8 @@ 2011-10-24 Ulrich Drepper <drepper@gmail.com> + * sysdeps/x86_64/dla.h (DLA_FMS): Some compilers fail to inline + __builtin_fma in some situations. Have to use an asm. + * config.make.in: Add have-mfma4 entry. * configure.in: Substitute libc_cv_cc_fma4. * math/Makefile (dbl-only-routines): Add sincostab. diff --git a/sysdeps/x86_64/dla.h b/sysdeps/x86_64/dla.h index 7aa06e5f6f..6fe8f740f3 100644 --- a/sysdeps/x86_64/dla.h +++ b/sysdeps/x86_64/dla.h @@ -1,6 +1,10 @@ -#if defined __FMA4__ || defined __FMA__ +#ifdef __FMA4__ # define DLA_FMS(x,y,z) \ - __builtin_fma (x, y, -z) + ({ double __z; \ + asm ("vfmsubsd %3, %2, %1, %0" \ + : "=x" (__z) \ + : "x" ((double) (x)), "xm" ((double) (y)) , "x" ((double) (z))); \ + __z; }) #endif #include "sysdeps/ieee754/dbl-64/dla.h" |