Siddhesh Poyarekar 2506109403 Set/restore rounding mode only when needed ... The most common use case of math functions is with default rounding mode, i.e. rounding to nearest. Setting and restoring rounding mode is an unnecessary overhead for this, so I've added support for a context, which does the set/restore only if the FP status needs a change. The code is written such that only x86 uses these. Other architectures should be unaffected by it, but would definitely benefit if the set/restore has as much overhead relative to the rest of the code, as the x86 bits do. Here's a summary of the performance improvement due to these improvements; I've only mentioned functions that use the set/restore and have benchmark inputs for x86_64: Before: cos(): ITERS:4.69335e+08: TOTAL:28884.6Mcy, MAX:4080.28cy, MIN:57.562cy, 16248.6 calls/Mcy exp(): ITERS:4.47604e+08: TOTAL:28796.2Mcy, MAX:207.721cy, MIN:62.385cy, 15543.9 calls/Mcy pow(): ITERS:1.63485e+08: TOTAL:28879.9Mcy, MAX:362.255cy, MIN:172.469cy, 5660.86 calls/Mcy sin(): ITERS:3.89578e+08: TOTAL:28900Mcy, MAX:704.859cy, MIN:47.583cy, 13480.2 calls/Mcy tan(): ITERS:7.0971e+07: TOTAL:28902.2Mcy, MAX:1357.79cy, MIN:388.58cy, 2455.55 calls/Mcy After: cos(): ITERS:6.0014e+08: TOTAL:28875.9Mcy, MAX:364.283cy, MIN:45.716cy, 20783.4 calls/Mcy exp(): ITERS:5.48578e+08: TOTAL:28764.9Mcy, MAX:191.617cy, MIN:51.011cy, 19071.1 calls/Mcy pow(): ITERS:1.70013e+08: TOTAL:28873.6Mcy, MAX:689.522cy, MIN:163.989cy, 5888.18 calls/Mcy sin(): ITERS:4.64079e+08: TOTAL:28891.5Mcy, MAX:6959.3cy, MIN:36.189cy, 16062.8 calls/Mcy tan(): ITERS:7.2354e+07: TOTAL:28898.9Mcy, MAX:1295.57cy, MIN:380.698cy, 2503.7 calls/Mcy So the improvements are: cos: 27.9089% exp: 22.6919% pow: 4.01564% sin: 19.1585% tan: 1.96086% The downside of the change is that it will have an adverse performance impact on non-default rounding modes, but I think the tradeoff is justified.		2013-06-12 10:36:48 +05:30
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generic	Set/restore rounding mode only when needed	2013-06-12 10:36:48 +05:30
gnu	Avoid trailing whitespace in sysdeps/gnu/errlist.c.	2013-06-08 14:55:32 +00:00
i386	Set/restore rounding mode only when needed	2013-06-12 10:36:48 +05:30
ieee754	Fix leading whitespaces.	2013-06-06 20:36:07 +02:00
init_array	Add sysdeps/init_array to produce empty crt[in].o and use .preinit_array for gcrt1.o	2013-03-12 12:50:13 -07:00
mach	Use (void) in no-arguments function definitions.	2013-06-08 00:22:23 +00:00
posix	Fix symbol definitions for __clock_* functions	2013-06-11 11:11:11 +05:30
powerpc	PowerPC: Merge ports/ dl-procinfo.[ch] with base.	2013-06-11 10:13:39 -05:00
pthread	BZ#15361: Make aio_fsync not check open modes.	2013-04-12 13:11:20 -07:00
s390	Remove trailing whitespace.	2013-06-05 20:44:03 +00:00
sh	Remove trailing whitespace.	2013-06-05 20:44:03 +00:00
sparc	Fix leading whitespaces.	2013-06-06 20:36:07 +02:00
unix	Fix symbol definitions for __clock_* functions	2013-06-11 11:11:11 +05:30
wordsize-32	Update copyright notices with scripts/update-copyrights.	2013-01-02 19:05:09 +00:00
wordsize-64	Move dummy glob64.c alongside glob.c that defines glob64.	2013-05-06 16:11:11 -07:00
x86	Avoid use of "register" as optimization hint.	2013-06-07 22:24:35 +00:00
x86_64	Remove trailing whitespace.	2013-06-05 20:44:03 +00:00