cvs commit: src/sys/libkern mcount.c
Bruce Evans
bde at FreeBSD.org
Wed Jun 13 06:17:49 UTC 2007
bde 2007-06-13 06:17:48 UTC
FreeBSD src repository
Modified files:
sys/libkern mcount.c
Log:
Unbreak high resolution profiling a little: use dummy asms to prevent
timing loops being optimized away.
Once apon a time, gcc promised not to optimize away timing loops, but
gcc started optimizing away the call to a null function in the timing
loop here some time between gcc-3.3.3 and gcc-3.4.6, and it started
optimizing away the timing loop itself some time between gcc-3.4.6
and gcc-4.2.
Revision Changes Path
1.24 +6 -1 src/sys/libkern/mcount.c
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