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more peephole optimization on OP_MOVE

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This commit is contained in:
Yukihiro Matsumoto
2012-07-28 11:23:29 +09:00
parent 88043c5ccd
commit 7f8076ef90
1 changed files with 6 additions and 2 deletions
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src/codegen.c
+6 -2
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@@ -145,7 +145,7 @@ genop(codegen_scope *s, mrb_code i)
static void
genop_peep(codegen_scope *s, mrb_code i, int val)
{
// peephole optimization
/* peephole optimization */
if (!val && s->lastlabel != s->pc && s->pc > 0) {
mrb_code i0 = s->iseq[s->pc-1];
int c1 = GET_OPCODE(i);
@@ -156,9 +156,13 @@ genop_peep(codegen_scope *s, mrb_code i, int val)
switch (c0) {
case OP_MOVE:
if (GETARG_B(i) == GETARG_A(i0) && GETARG_A(i) == GETARG_B(i0) && GETARG_A(i) >= s->nlocals) {
// skip swapping OP_MOVE
/* skip swapping OP_MOVE */
return;
}
if (GETARG_B(i) == GETARG_A(i0) && GETARG_A(i0) >= s->nlocals) {
s->iseq[s->pc-1] = MKOP_AB(OP_MOVE, GETARG_A(i), GETARG_B(i0));
return;
}
break;
case OP_LOADI:
if (GETARG_B(i) == GETARG_A(i0) && GETARG_A(i0) >= s->nlocals) {