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DCSE: Fix store flag elimination

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Scott Mansell committed 2020-07-25 04:38:41 +12:00
1 parent 4e783202bc
commit f77ee9a99c
1 file changed
+11 -1
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External/FEXCore/Source/Interface/IR/Passes/DeadContextStoreElimination.cpp
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+11 -1
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@@ -294,7 +294,8 @@ ContextMemberInfo *RCLSE::RecordAccess(ContextMemberInfo *Info, FEXCore::IR::Reg
Info->AccessOffset = Offset;
Info->AccessSize = Size;
Info->Node = Node;
Info->StoreNode = StoreNode;
if (StoreNode != nullptr)
Info->StoreNode = StoreNode;
return Info;
}
@@ -523,7 +524,16 @@ bool RCLSE::RedundantStoreLoadElimination(FEXCore::IR::IREmitter *IREmit) {
}
else if (IROp->Op == OP_STOREFLAG) {
auto Op = IROp->CW<IR::IROp_StoreFlag>();
auto Info = FindMemberInfo(&LocalInfo, offsetof(FEXCore::Core::CPUState, flags[0]) + Op->Flag, 1);
auto LastStoreNode = Info->StoreNode;
RecordAccess(&LocalInfo, FEXCore::IR::GPRClass, offsetof(FEXCore::Core::CPUState, flags[0]) + Op->Flag, 1, ACCESS_WRITE, Op->Header.Args[0].GetNode(ListBegin), CodeNode);
// Flags don't alias, so we can take the simple route here. Kill any flags that have been overwritten
if (LastStoreNode != nullptr)
{
IREmit->Remove(LastStoreNode);
Changed = true;
}
}
else if (IROp->Op == OP_LOADFLAG) {
auto Op = IROp->CW<IR::IROp_LoadFlag>();