diff options
| author | Carl Shapiro <cshapiro@google.com> | 2013-12-05 17:35:22 -0800 |
|---|---|---|
| committer | Carl Shapiro <cshapiro@google.com> | 2013-12-05 17:35:22 -0800 |
| commit | 950d5e501cfce748cb115e8a8491672850613cb2 (patch) | |
| tree | eef04c58ca814e0cecfb6fe7663439af10b7fbba /src/cmd/6l | |
| parent | 89f7fae4071236c62ed6833c5e099a78f9b53721 (diff) | |
| download | go-950d5e501cfce748cb115e8a8491672850613cb2.tar.gz | |
cmd/5g, cmd/5l, cmd/6g, cmd/6l, cmd/8g, cmd/8l, cmd/gc, runtime: generate pointer maps by liveness analysis
This change allows the garbage collector to examine stack
slots that are determined as live and containing a pointer
value by the garbage collector. This results in a mean
reduction of 65% in the number of stack slots scanned during
an invocation of "GOGC=1 all.bash".
Unfortunately, this does not yet allow garbage collection to
be precise for the stack slots computed as live. Pointers
confound the determination of what definitions reach a given
instruction. In general, this problem is not solvable without
runtime cost but some advanced cooperation from the compiler
might mitigate common cases.
R=golang-dev, rsc, cshapiro
CC=golang-dev
https://codereview.appspot.com/14430048
Diffstat (limited to 'src/cmd/6l')
| -rw-r--r-- | src/cmd/6l/6.out.h | 1 | ||||
| -rw-r--r-- | src/cmd/6l/optab.c | 3 |
2 files changed, 4 insertions, 0 deletions
diff --git a/src/cmd/6l/6.out.h b/src/cmd/6l/6.out.h index 5fa73a65b..64c8ac2fe 100644 --- a/src/cmd/6l/6.out.h +++ b/src/cmd/6l/6.out.h @@ -762,6 +762,7 @@ enum as AFUNCDATA, APCDATA, ACHECKNIL, + AFATVARDEF, ALAST }; diff --git a/src/cmd/6l/optab.c b/src/cmd/6l/optab.c index 46603ad45..f48c6c329 100644 --- a/src/cmd/6l/optab.c +++ b/src/cmd/6l/optab.c @@ -1352,8 +1352,11 @@ Optab optab[] = { APCLMULQDQ, yxshuf, Pq, 0x3a,0x44,0 }, { AUSEFIELD, ynop, Px, 0,0 }, + { ATYPE }, { AFUNCDATA, yfuncdata, Px, 0,0 }, { APCDATA, ypcdata, Px, 0,0 }, + { ACHECKNIL }, + { AFATVARDEF }, { AEND }, 0 |