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| author | Russ Cox <rsc@golang.org> | 2012-05-02 16:22:56 -0400 |
|---|---|---|
| committer | Russ Cox <rsc@golang.org> | 2012-05-02 16:22:56 -0400 |
| commit | 3211f96b14cdebfc6988c9d8b56d4e9c9a8b849e (patch) | |
| tree | 86d169d576d4c0cc873be6c8dd5a13e242495663 /src/cmd/8c/peep.c | |
| parent | 047f2682ed40839fb88158f57c1db0518ffa5310 (diff) | |
| download | go-3211f96b14cdebfc6988c9d8b56d4e9c9a8b849e.tar.gz | |
cmd/cc: add PREFETCH built-in (like SET, USED)
This makes it possible to inline the prefetch of upcoming
memory addresses during garbage collection, instead of
needing to flush registers, make a function call, and
reload registers. On garbage collection-heavy workloads,
this results in a 5% speedup.
Fixes issue 3493.
R=dvyukov, ken, r, dave
CC=golang-dev
http://codereview.appspot.com/5990066
Diffstat (limited to 'src/cmd/8c/peep.c')
| -rw-r--r-- | src/cmd/8c/peep.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/cmd/8c/peep.c b/src/cmd/8c/peep.c index 9511a5579..9c3e9a5af 100644 --- a/src/cmd/8c/peep.c +++ b/src/cmd/8c/peep.c @@ -602,6 +602,12 @@ copyu(Prog *p, Adr *v, Adr *s) case ACMPL: /* read only */ case ACMPW: case ACMPB: + + case APREFETCHT0: + case APREFETCHT1: + case APREFETCHT2: + case APREFETCHNTA: + case AFCOMB: case AFCOMBP: |