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cmd/5g, cmd/6g, cmd/8g: faster compilation

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Replace linked list walk with memset.
This reduces CPU time taken by 'go install -a std' by ~10%.
Before:
real		user		sys
0m23.561s	0m16.625s	0m5.848s
0m23.766s	0m16.624s	0m5.846s
0m23.742s	0m16.621s	0m5.868s
after:
0m22.714s	0m14.858s	0m6.138s
0m22.644s	0m14.875s	0m6.120s
0m22.604s	0m14.854s	0m6.081s

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/13084043
This commit is contained in:
Dmitriy Vyukov 2013-08-21 14:20:28 +04:00
parent c1dd7f4322
commit 06e686def6
3 changed files with 37 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
src/cmd/5g/peep.c
View File

@ -63,6 +63,8 @@ peep(Prog *firstp)
g = flowstart(firstp, sizeof(Flow));
if(g == nil)
return;
for(r=g->start, t=0; r!=nil; r=r->link, t++)
r->active = t;
loop1:
if(debug['P'] && debug['v'])
@ -343,6 +345,9 @@ gotit:
return 1;
}
static uchar *active;
static int nactive;
/*
* The idea is to remove redundant copies.
* v1->v2 F=0
@ -360,15 +365,17 @@ copyprop(Graph *g, Flow *r0)
{
Prog *p;
Adr *v1, *v2;
Flow *r;
p = r0->prog;
v1 = &p->from;
v2 = &p->to;
if(copyas(v1, v2))
return 1;
for(r=g->start; r!=nil; r=r->link)
r->active = 0;
if(nactive < g->num) {
nactive = g->num;
active = realloc(active, g->num);
}
memset(active, 0, g->num);
return copy1(v1, v2, r0->s1, 0);
}
@ -378,12 +385,12 @@ copy1(Adr *v1, Adr *v2, Flow *r, int f)
int t;
Prog *p;
if(r->active) {
if(active[r->active]) {
if(debug['P'])
print("act set; return 1\n");
return 1;
}
r->active = 1;
active[r->active] = 1;
if(debug['P'])
print("copy %D->%D f=%d\n", v1, v2, f);
for(; r != nil; r = r->s1) {

17
src/cmd/6g/peep.c
View File

@ -92,6 +92,8 @@ peep(Prog *firstp)
g = flowstart(firstp, sizeof(Flow));
if(g == nil)
return;
for(r=g->start, t=0; r!=nil; r=r->link, t++)
r->active = t;
// byte, word arithmetic elimination.
elimshortmov(g);
@ -626,6 +628,9 @@ gotit:
return 1;
}
static uchar *active;
static int nactive;
/*
* The idea is to remove redundant copies.
* v1->v2 F=0
@ -643,7 +648,6 @@ copyprop(Graph *g, Flow *r0)
{
Prog *p;
Adr *v1, *v2;
Flow *r;
if(debug['P'] && debug['v'])
print("copyprop %P\n", r0->prog);
@ -652,8 +656,11 @@ copyprop(Graph *g, Flow *r0)
v2 = &p->to;
if(copyas(v1, v2))
return 1;
for(r=g->start; r!=nil; r=r->link)
r->active = 0;
if(nactive < g->num) {
nactive = g->num;
active = realloc(active, g->num);
}
memset(active, 0, g->num);
return copy1(v1, v2, r0->s1, 0);
}
@ -663,12 +670,12 @@ copy1(Adr *v1, Adr *v2, Flow *r, int f)
int t;
Prog *p;
if(r->active) {
if(active[r->active]) {
if(debug['P'])
print("act set; return 1\n");
return 1;
}
r->active = 1;
active[r->active] = 1;
if(debug['P'])
print("copy %D->%D f=%d\n", v1, v2, f);
for(; r != nil; r = r->s1) {

17
src/cmd/8g/peep.c
View File

@ -91,6 +91,8 @@ peep(Prog *firstp)
g = flowstart(firstp, sizeof(Flow));
if(g == nil)
return;
for(r=g->start, t=0; r!=nil; r=r->link, t++)
r->active = t;
// byte, word arithmetic elimination.
elimshortmov(g);
@ -424,6 +426,9 @@ gotit:
return 1;
}
static uchar *active;
static int nactive;
/*
* The idea is to remove redundant copies.
* v1->v2 F=0
@ -441,15 +446,17 @@ copyprop(Graph *g, Flow *r0)
{
Prog *p;
Adr *v1, *v2;
Flow *r;
p = r0->prog;
v1 = &p->from;
v2 = &p->to;
if(copyas(v1, v2))
return 1;
for(r=g->start; r!=nil; r=r->link)
r->active = 0;
if(nactive < g->num) {
nactive = g->num;
active = realloc(active, g->num);
}
memset(active, 0, g->num);
return copy1(v1, v2, r0->s1, 0);
}
@ -459,12 +466,12 @@ copy1(Adr *v1, Adr *v2, Flow *r, int f)
int t;
Prog *p;
if(r->active) {
if(active[r->active]) {
if(debug['P'])
print("act set; return 1\n");
return 1;
}
r->active = 1;
active[r->active] = 1;
if(debug['P'])
print("copy %D->%D f=%d\n", v1, v2, f);
for(; r != nil; r = r->s1) {