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ADD_CARRY constant prop for load-CA cases.

This commit is contained in:
Ben Vanik 2014-08-07 13:23:44 -07:00
parent e4485bdab1
commit fa1693d3a3
1 changed files with 20 additions and 0 deletions
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20
src/alloy/compiler/passes/constant_propagation_pass.cc
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@ -300,6 +300,26 @@ int ConstantPropagationPass::Run(HIRBuilder* builder) {
}
break;
// TODO(benvanik): ADD_CARRY (w/ ARITHMETIC_SET_CARRY)
case OPCODE_ADD_CARRY:
if (i->src1.value->IsConstantZero() && i->src2.value->IsConstantZero()) {
Value* ca = i->src3.value;
// If carry is set find the DID_CARRY and fix it.
if (!!(i->flags & ARITHMETIC_SET_CARRY)) {
auto next = i->dest->use_head;
while (next) {
auto use = next;
next = use->next;
if (use->instr->opcode == &OPCODE_DID_CARRY_info) {
// Replace carry value.
use->instr->Replace(&OPCODE_ASSIGN_info, 0);
use->instr->set_src1(ca);
}
}
}
i->Replace(&OPCODE_ASSIGN_info, 0);
i->set_src1(ca);
}
break;
case OPCODE_SUB:
if (i->src1.value->IsConstant() && i->src2.value->IsConstant()) {
v->set_from(i->src1.value);