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optimize assignment just before OP_RETURN

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This commit is contained in:
Yukihiro Matsumoto
2012-08-10 05:15:58 +09:00
parent 8d017ebdb7
commit 4debf651a3
1 changed files with 15 additions and 3 deletions
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src/codegen.c
+15 -3
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@@ -142,6 +142,9 @@ genop(codegen_scope *s, mrb_code i)
s->pc++;
}
#define NOVAL 0
#define VAL 1
static void
genop_peep(codegen_scope *s, mrb_code i, int val)
{
@@ -217,6 +220,7 @@ genop_peep(codegen_scope *s, mrb_code i, int val)
case OP_SETCV:
case OP_SETCONST:
case OP_SETMCNST:
case OP_SETGLOBAL:
if (c0 == OP_MOVE) {
if (GETARG_A(i) == GETARG_A(i0)) {
s->iseq[s->pc-1] = MKOP_ABx(c1, GETARG_B(i0), GETARG_Bx(i));
@@ -261,6 +265,17 @@ genop_peep(codegen_scope *s, mrb_code i, int val)
s->iseq[s->pc-1] = MKOP_ABC(c0, 0, GETARG_B(i0), GETARG_C(i0));
genop(s, MKOP_AB(OP_RETURN, 0, OP_R_NORMAL));
return;
case OP_SETIV:
case OP_SETCV:
case OP_SETCONST:
case OP_SETMCNST:
case OP_SETUPVAR:
case OP_SETGLOBAL:
s->pc--;
genop_peep(s, i0, NOVAL);
i0 = s->iseq[s->pc-1];
genop(s, MKOP_AB(OP_RETURN, GETARG_A(i0), OP_R_NORMAL));
return;
case OP_LOADSYM:
case OP_GETGLOBAL:
case OP_GETIV:
@@ -436,9 +451,6 @@ lv_idx(codegen_scope *s, mrb_sym id)
return 0;
}
#define NOVAL 0
#define VAL 1
static void
for_body(codegen_scope *s, node *tree)
{