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added missing sgen reverse character copy code.

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R=rsc
http://go/go-review/1018006
This commit is contained in:
Kai Backman 2009-10-30 09:38:30 -07:00
parent 770b872752
commit 1d0b65d33f
1 changed files with 24 additions and 1 deletions
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25
src/cmd/5g/cgen.c
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@ -1084,7 +1084,7 @@ sgen(Node *n, Node *res, int32 w)
regalloc(&dst, types[tptr], res); regalloc(&dst, types[tptr], res);
if(n->ullman >= res->ullman) { if(n->ullman >= res->ullman) {
agen(n, &dst); agen(n, &dst); // temporarily use dst
regalloc(&src, types[tptr], N); regalloc(&src, types[tptr], N);
gins(AMOVW, &dst, &src); gins(AMOVW, &dst, &src);
agen(res, &dst); agen(res, &dst);
@ -1137,6 +1137,29 @@ sgen(Node *n, Node *res, int32 w)
patch(gbranch(ABNE, T), ploop); patch(gbranch(ABNE, T), ploop);
regfree(&nend); regfree(&nend);
} else {
// move src and dest to the end of block
p = gins(AMOVW, &src, &src);
p->from.type = D_CONST;
p->from.offset = (q-1)*4;
p = gins(AMOVW, &dst, &dst);
p->from.type = D_CONST;
p->from.offset = (q-1)*4;
while(q > 0) {
p = gins(AMOVW, &src, &tmp);
p->from.type = D_OREG;
p->from.offset = -4;
p->scond |= C_PBIT;
p = gins(AMOVW, &tmp, &dst);
p->to.type = D_OREG;
p->to.offset = -4;
p->scond |= C_PBIT;
q--;
}
} }
} else { } else {
// normal direction // normal direction