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authorAdhemerval Zanella <azanella@linux.vnet.ibm.com>2013-11-25 06:12:30 -0600
committerAdhemerval Zanella <azanella@linux.vnet.ibm.com>2013-11-25 06:34:41 -0600
commit41e8926aa4b7f17bc95984737ee82a254ad0911c (patch)
treef113bbedd0ec991ae1b9dddf3a36077e22d19815 /sysdeps/ieee754/ldbl-128ibm/s_lrintl.c
parent085b5ddfe301eb74bc9f824ff293f054c1c910b7 (diff)
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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 'sysdeps/ieee754/ldbl-128ibm/s_lrintl.c')
-rw-r--r--sysdeps/ieee754/ldbl-128ibm/s_lrintl.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sysdeps/ieee754/ldbl-128ibm/s_lrintl.c b/sysdeps/ieee754/ldbl-128ibm/s_lrintl.c
index 588098d090..49dbd42f5b 100644
--- a/sysdeps/ieee754/ldbl-128ibm/s_lrintl.c
+++ b/sysdeps/ieee754/ldbl-128ibm/s_lrintl.c
@@ -49,7 +49,7 @@ __lrintl (long double x)
 #endif
     )
     {
-      save_round = fegetround ();
+      save_round = __fegetround ();
 
 #if __LONG_MAX__ == 2147483647
       long long llhi = (long long) xh;