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ir_opt/a32_constant_memory_reads_pass: Apply const where applicable to locals

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Makes immutable state just slightly more explicit.
This commit is contained in:
Lioncash 2019-04-11 18:18:26 -04:00 committed by MerryMage
parent e7361148db
commit 7d535eaba6
1 changed files with 17 additions and 13 deletions
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30
src/ir_opt/a32_constant_memory_reads_pass.cpp
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@ -16,52 +16,56 @@ void A32ConstantMemoryReads(IR::Block& block, A32::UserCallbacks* cb) {
for (auto& inst : block) {
switch (inst.GetOpcode()) {
case IR::Opcode::A32SetCFlag: {
IR::Value arg = inst.GetArg(0);
const IR::Value arg = inst.GetArg(0);
if (!arg.IsImmediate() && arg.GetInst()->GetOpcode() == IR::Opcode::A32GetCFlag) {
inst.Invalidate();
}
break;
}
case IR::Opcode::A32ReadMemory8: {
if (!inst.AreAllArgsImmediates())
if (!inst.AreAllArgsImmediates()) {
break;
}
u32 vaddr = inst.GetArg(0).GetU32();
const u32 vaddr = inst.GetArg(0).GetU32();
if (cb->IsReadOnlyMemory(vaddr)) {
u8 value_from_memory = cb->MemoryRead8(vaddr);
const u8 value_from_memory = cb->MemoryRead8(vaddr);
inst.ReplaceUsesWith(IR::Value{value_from_memory});
}
break;
}
case IR::Opcode::A32ReadMemory16: {
if (!inst.AreAllArgsImmediates())
if (!inst.AreAllArgsImmediates()) {
break;
}
u32 vaddr = inst.GetArg(0).GetU32();
const u32 vaddr = inst.GetArg(0).GetU32();
if (cb->IsReadOnlyMemory(vaddr)) {
u16 value_from_memory = cb->MemoryRead16(vaddr);
const u16 value_from_memory = cb->MemoryRead16(vaddr);
inst.ReplaceUsesWith(IR::Value{value_from_memory});
}
break;
}
case IR::Opcode::A32ReadMemory32: {
if (!inst.AreAllArgsImmediates())
if (!inst.AreAllArgsImmediates()) {
break;
}
u32 vaddr = inst.GetArg(0).GetU32();
const u32 vaddr = inst.GetArg(0).GetU32();
if (cb->IsReadOnlyMemory(vaddr)) {
u32 value_from_memory = cb->MemoryRead32(vaddr);
const u32 value_from_memory = cb->MemoryRead32(vaddr);
inst.ReplaceUsesWith(IR::Value{value_from_memory});
}
break;
}
case IR::Opcode::A32ReadMemory64: {
if (!inst.AreAllArgsImmediates())
if (!inst.AreAllArgsImmediates()) {
break;
}
u32 vaddr = inst.GetArg(0).GetU32();
const u32 vaddr = inst.GetArg(0).GetU32();
if (cb->IsReadOnlyMemory(vaddr)) {
u64 value_from_memory = cb->MemoryRead64(vaddr);
const u64 value_from_memory = cb->MemoryRead64(vaddr);
inst.ReplaceUsesWith(IR::Value{value_from_memory});
}
break;