Keith Randall 6c7cbf086c runtime: get rid of most uses of REP for copying/zeroing. ... REP MOVSQ and REP STOSQ have a really high startup overhead. Use a Duff's device to do the repetition instead. benchmark old ns/op new ns/op delta BenchmarkClearFat32 7.20 1.60 -77.78% BenchmarkCopyFat32 6.88 2.38 -65.41% BenchmarkClearFat64 7.15 3.20 -55.24% BenchmarkCopyFat64 6.88 3.44 -50.00% BenchmarkClearFat128 9.53 5.34 -43.97% BenchmarkCopyFat128 9.27 5.56 -40.02% BenchmarkClearFat256 13.8 9.53 -30.94% BenchmarkCopyFat256 13.5 10.3 -23.70% BenchmarkClearFat512 22.3 18.0 -19.28% BenchmarkCopyFat512 22.0 19.7 -10.45% BenchmarkCopyFat1024 36.5 38.4 +5.21% BenchmarkClearFat1024 35.1 35.0 -0.28% TODO: use for stack frame zeroing TODO: REP prefixes are still used for "reverse" copying when src/dst regions overlap. Might be worth fixing. LGTM=rsc R=golang-codereviews, rsc CC=golang-codereviews, r https://golang.org/cl/81370046		2014-04-01 12:51:02 -07:00
..
cmd	runtime: get rid of most uses of REP for copying/zeroing.	2014-04-01 12:51:02 -07:00
lib9	lib9/utf: bring C environment up to Unicode 6.3.0	2014-02-25 17:49:32 -08:00
libbio	lib9: enable on Plan 9	2014-02-13 20:06:41 +01:00
liblink	runtime: get rid of most uses of REP for copying/zeroing.	2014-04-01 12:51:02 -07:00
libmach	libmach: use different names for different Ureg types	2014-01-08 20:37:27 -05:00
pkg	runtime: get rid of most uses of REP for copying/zeroing.	2014-04-01 12:51:02 -07:00
all.bash
all.bat
all.rc
clean.bash
clean.bat
clean.rc
make.bash	cmd/go, cmd/cgo, make.bash: cross compiling with cgo enabled	2014-02-06 09:11:00 -08:00
make.bat
Make.dist
make.rc	lib9: enable on Plan 9	2014-02-13 20:06:41 +01:00
race.bash
race.bat
run.bash	run.bash: explain why we set GOMAXPROCS for runtime test	2014-03-06 13:16:14 +04:00
run.bat	run.bash: explain why we set GOMAXPROCS for runtime test	2014-03-06 13:16:14 +04:00
run.rc	run.bash: explain why we set GOMAXPROCS for runtime test	2014-03-06 13:16:14 +04:00
sudo.bash