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| author | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2013-11-25 06:12:30 -0600 |
|---|---|---|
| committer | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2013-11-25 06:34:41 -0600 |
| commit | 41e8926aa4b7f17bc95984737ee82a254ad0911c (patch) | |
| tree | f113bbedd0ec991ae1b9dddf3a36077e22d19815 /ChangeLog | |
| parent | 085b5ddfe301eb74bc9f824ff293f054c1c910b7 (diff) | |
| download | glibc-41e8926aa4b7f17bc95984737ee82a254ad0911c.tar glibc-41e8926aa4b7f17bc95984737ee82a254ad0911c.tar.gz glibc-41e8926aa4b7f17bc95984737ee82a254ad0911c.tar.bz2 glibc-41e8926aa4b7f17bc95984737ee82a254ad0911c.zip | |
PowerPC: Set/restore rounding mode only when needed
This patch helps some math functions performance by adding the libc_fexxx
variant of inline functions to handle both FPU round and exception set/restore
and by using them on the libc_fexxx_ctx functions. It is based on already coded
fexxx family functions for PPC with fpu.
Here is the summary of performance improvements due this patch (measured on a
POWER7 machine):
Before:
cos(): ITERS:9.5895e+07: TOTAL:5116.03Mcy, MAX:77.6cy, MIN:49.792cy, 18744 calls/Mcy
exp(): ITERS:2.827e+07: TOTAL:5187.15Mcy, MAX:494.018cy, MIN:38.422cy, 5450.01 calls/Mcy
pow(): ITERS:6.1705e+07: TOTAL:5144.26Mcy, MAX:171.95cy, MIN:29.935cy, 11994.9 calls/Mcy
sin(): ITERS:8.6898e+07: TOTAL:5117.06Mcy, MAX:83.841cy, MIN:46.582cy, 16982 calls/Mcy
tan(): ITERS:2.9473e+07: TOTAL:5115.39Mcy, MAX:191.017cy, MIN:172.352cy, 5761.63 calls/Mcy
After:
cos(): ITERS:2.05265e+08: TOTAL:5111.37Mcy, MAX:78.754cy, MIN:24.196cy, 40158.5 calls/Mcy
exp(): ITERS:3.341e+07: TOTAL:5170.84Mcy, MAX:476.317cy, MIN:15.574cy, 6461.23 calls/Mcy
pow(): ITERS:7.6153e+07: TOTAL:5129.1Mcy, MAX:147.5cy, MIN:30.916cy, 14847.2 calls/Mcy
sin(): ITERS:1.58816e+08: TOTAL:5115.11Mcy, MAX:1490.39cy, MIN:22.341cy, 31048.4 calls/Mcy
tan(): ITERS:3.4964e+07: TOTAL:5114.18Mcy, MAX:177.422cy, MIN:146.115cy, 6836.68 calls/Mcy
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 16 |
1 files changed, 16 insertions, 0 deletions
@@ -1,3 +1,19 @@ +2013-11-25 Adhemerval Zanella <azanella@linux.vnet.ibm.com> + + * sysdeps/ieee754/ldbl-128ibm/e_expl.c (__ieee754_expl): Use + SET_RESTORE_ROUND instead of feholdexcept/fesetround/fesetenv. + * sysdeps/powerpc/fpu/fenv_libc.h (__fegetround): Remove define. + (__fesetround): Remove define. + * sysdeps/powerpc/fpu/fenv_private.h: New file: Inline floating point + rounding and exceptions handling. + * sysdeps/powerpc/fpu/math_private.h: Include fenv_private.h. + * sysdeps/powerpc/fpu/fenv_libc.h (__fe_mask_env): Define as hidden. + (__fe_nomask_env): Likewise. + * sysdeps/ieee754/ldbl-128ibm/s_llrintl.c (__llrintl): Use + __fegetround instead of fegetround. + * sysdeps/ieee754/ldbl-128ibm/s_lrintl.c (__lrintl): Likewise. + * sysdeps/ieee754/ldbl-128ibm/s_rintl.c (__rintl): Likewise. + 2013-11-21 Roland McGrath <roland@hack.frob.com> * malloc/malloc.c: Move #include <sys/param.h> to the top; comment why |