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small code improvement to 

used scaled indexing

R=r
OCL=20308
CL=20310
This commit is contained in:
Ken Thompson 2008-12-02 19:54:51 -08:00
parent 89996e1fb1
commit c8a66a98ff
1 changed files with 13 additions and 7 deletions
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20
src/cmd/6g/cgen.c
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@ -476,11 +476,6 @@ agen(Node *n, Node *res)
patch(p1, pc);
}
if(w != 1) {
nodconst(&n1, t, w); // w
gins(optoas(OMUL, t), &n1, &n2);
}
if(isptrdarray(nl->type)) {
n1 = n3;
n1.op = OINDREG;
@ -488,9 +483,20 @@ agen(Node *n, Node *res)
n1.xoffset = offsetof(Array, array);
gmove(&n1, &n3);
}
gins(optoas(OADD, types[tptr]), &n2, &n3);
gmove(&n3, res);
if(w == 1 || w == 2 || w == 4 || w == 8) {
p1 = gins(ALEAQ, &n2, &n3);
p1->from.scale = w;
p1->from.index = p1->from.type;
p1->from.type = p1->to.type + D_INDIR;
} else {
nodconst(&n1, t, w);
gins(optoas(OMUL, t), &n1, &n2);
gins(optoas(OADD, types[tptr]), &n2, &n3);
gmove(&n3, res);
}
gmove(&n3, res);
regfree(&n2);
regfree(&n3);
break;