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[dev.power64] cmd/9g: use loops to do memmove in sgen()

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LGTM=rsc
R=rsc, iant
CC=golang-codereviews
https://golang.org/cl/128130044
This commit is contained in:
Shenghou Ma 2014-08-13 01:22:34 -04:00
parent bc8d35a9cf
commit 372b5cebe7
1 changed files with 21 additions and 18 deletions
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39
src/cmd/9g/cgen.c
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@ -1344,10 +1344,10 @@ stkof(Node *n)
void
sgen(Node *n, Node *ns, int64 w)
{
Node dst, src, tmp;
Node dst, src, tmp, nend;
int32 c, odst, osrc;
int dir, align, op;
Prog *p;
Prog *p, *ploop;
NodeList *l;
Node *res = ns;
@ -1447,19 +1447,15 @@ sgen(Node *n, Node *ns, int64 w)
regalloc(&tmp, types[tptr], N);
// set up end marker
//memset(&nend, 0, sizeof nend);
//if(c >= 4) {
// regalloc(&nend, types[tptr], N);
// p = gins(AMOVD, &src, &nend);
// p->from.type = D_CONST;
// if(dir < 0)
// p->from.offset = dir;
// else
// p->from.offset = w;
//}
memset(&nend, 0, sizeof nend);
// move src and dest to the end of block if necessary
if(dir < 0) {
if(c >= 4) {
regalloc(&nend, types[tptr], N);
p = gins(AMOVD, &src, &nend);
}
p = gins(AADD, N, &src);
p->from.type = D_CONST;
p->from.offset = w;
@ -1475,11 +1471,19 @@ sgen(Node *n, Node *ns, int64 w)
p = gins(AADD, N, &dst);
p->from.type = D_CONST;
p->from.offset = -dir;
if(c >= 4) {
regalloc(&nend, types[tptr], N);
p = gins(AMOVD, &src, &nend);
p->from.type = D_CONST;
p->from.offset = w;
}
}
// move
// TODO: enable loops and duffcopy for larger copies.
/*if(c >= 4) {
// TODO: enable duffcopy for larger copies.
if(c >= 4) {
p = gins(op, &src, &tmp);
p->from.type = D_OREG;
p->from.offset = dir;
@ -1489,12 +1493,11 @@ sgen(Node *n, Node *ns, int64 w)
p->to.type = D_OREG;
p->to.offset = dir;
p = gins(ACMP, &src, N);
raddr(&nend, p);
p = gins(ACMP, &src, &nend);
patch(gbranch(ABNE, T, 0), ploop);
regfree(&nend);
} else*/ {
} else {
while(c-- > 0) {
p = gins(op, &src, &tmp);
p->from.type = D_OREG;