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codegen.c: peephole optimize OP_JMPxxx.

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This commit is contained in:
Yukihiro "Matz" Matsumoto
2021-08-01 20:31:19 +09:00
parent b1cb6c3c69
commit 9dc801a798
1 changed files with 32 additions and 3 deletions
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mrbgems/mruby-compiler/core/codegen.c
+32 -3
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@@ -524,9 +524,38 @@ genjmp2(codegen_scope *s, mrb_code i, uint16_t a, uint32_t pc, int val)
if (!no_peephole(s) && !val) {
struct mrb_insn_data data = mrb_last_insn(s);
if (data.insn == OP_MOVE && data.a == a) {
rewind_pc(s);
a = data.b;
switch (data.insn) {
case OP_MOVE:
if (data.a == a && data.a > s->nlocals) {
rewind_pc(s);
a = data.b;
}
break;
case OP_LOADNIL:
case OP_LOADF:
if (data.a == a || data.a > s->nlocals) {
s->pc = addr_pc(s, data.addr);
if (i == OP_JMPNOT || (i == OP_JMPNIL && data.insn == OP_LOADNIL)) {
return genjmp(s, OP_JMP, pc);
}
else { /* OP_JMPIF */
return JMPLINK_START;
}
}
break;
case OP_LOADT: case OP_LOADI: case OP_LOADINEG: case OP_LOADI__1:
case OP_LOADI_0: case OP_LOADI_1: case OP_LOADI_2: case OP_LOADI_3:
case OP_LOADI_4: case OP_LOADI_5: case OP_LOADI_6: case OP_LOADI_7:
if (data.a == a || data.a > s->nlocals) {
s->pc = addr_pc(s, data.addr);
if (i == OP_JMPIF) {
return genjmp(s, OP_JMP, pc);
}
else { /* OP_JMPNOT and OP_JMPNIL */
return JMPLINK_START;
}
}
break;
}
}