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cmd/5g: avoid temporaries in agen OINDEX

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Most benchmarks are within the 3% margin of error. This code path is quite common in the fmt package.

linux/arm, Freescale iMX.53 (cortex-a8)

fmt:
benchmark                      old ns/op    new ns/op    delta
BenchmarkSprintfEmpty                925          785  -15.14%
BenchmarkSprintfString              5050         5039   -0.22%
BenchmarkSprintfInt                 4425         4406   -0.43%
BenchmarkSprintfIntInt              5802         5762   -0.69%
BenchmarkSprintfPrefixedInt         7029         6541   -6.94%
BenchmarkSprintfFloat              10278        10083   -1.90%
BenchmarkManyArgs                  18558        17606   -5.13%
BenchmarkScanInts               15592690     15415360   -1.14%
BenchmarkScanRecursiveInt       25155020     25050900   -0.41%

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6921056
This commit is contained in:
Dave Cheney 2012-12-22 09:09:31 +11:00
parent 4f79cef7f2
commit 3dcc63f750
1 changed files with 5 additions and 6 deletions
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9
src/cmd/5g/cgen.c
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@ -1007,21 +1007,20 @@ agenr(Node *n, Node *a, Node *res)
if(!debug['B'] && !n->bounded) {
// check bounds
regalloc(&n4, types[TUINT32], N);
if(isconst(nl, CTSTR)) {
nodconst(&n1, types[TUINT32], nl->val.u.sval->len);
gmove(&n1, &n4);
nodconst(&n4, types[TUINT32], nl->val.u.sval->len);
} else if(isslice(nl->type) || nl->type->etype == TSTRING) {
n1 = n3;
n1.op = OINDREG;
n1.type = types[tptr];
n1.xoffset = Array_nel;
regalloc(&n4, types[TUINT32], N);
gmove(&n1, &n4);
} else {
nodconst(&n1, types[TUINT32], nl->type->bound);
gmove(&n1, &n4);
nodconst(&n4, types[TUINT32], nl->type->bound);
}
gcmp(optoas(OCMP, types[TUINT32]), &n2, &n4);
if(n4.op == OREGISTER)
regfree(&n4);
p1 = gbranch(optoas(OLT, types[TUINT32]), T, +1);
if(p2)