[PATCH] D75334: Let EarlyCSE fold equivalent freeze instructions
Juneyoung Lee via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Fri Feb 28 03:36:06 PST 2020
This revision was automatically updated to reflect the committed changes.
Closed by commit rGcc28a754679a: Let EarlyCSE fold equivalent freeze instructions (authored by aqjune).
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D75334/new/
https://reviews.llvm.org/D75334
Files:
llvm/lib/Transforms/Scalar/EarlyCSE.cpp
llvm/test/Transforms/EarlyCSE/basic.ll
Index: llvm/test/Transforms/EarlyCSE/basic.ll
===================================================================
--- llvm/test/Transforms/EarlyCSE/basic.ll
+++ llvm/test/Transforms/EarlyCSE/basic.ll
@@ -291,3 +291,14 @@
store i32 2, i32* @c, align 4
ret void
}
+
+define i1 @cse_freeze(i1 %a) {
+entry:
+; CHECK-LABEL: @cse_freeze(
+; CHECK: %b = freeze i1 %a
+; CHECK: ret i1 %b
+ %b = freeze i1 %a
+ %c = freeze i1 %a
+ %and = and i1 %b, %c
+ ret i1 %and
+}
Index: llvm/lib/Transforms/Scalar/EarlyCSE.cpp
===================================================================
--- llvm/lib/Transforms/Scalar/EarlyCSE.cpp
+++ llvm/lib/Transforms/Scalar/EarlyCSE.cpp
@@ -114,7 +114,7 @@
isa<CmpInst>(Inst) || isa<SelectInst>(Inst) ||
isa<ExtractElementInst>(Inst) || isa<InsertElementInst>(Inst) ||
isa<ShuffleVectorInst>(Inst) || isa<ExtractValueInst>(Inst) ||
- isa<InsertValueInst>(Inst);
+ isa<InsertValueInst>(Inst) || isa<FreezeInst>(Inst);
}
};
@@ -268,6 +268,9 @@
if (CastInst *CI = dyn_cast<CastInst>(Inst))
return hash_combine(CI->getOpcode(), CI->getType(), CI->getOperand(0));
+ if (FreezeInst *FI = dyn_cast<FreezeInst>(Inst))
+ return hash_combine(FI->getOpcode(), FI->getOperand(0));
+
if (const ExtractValueInst *EVI = dyn_cast<ExtractValueInst>(Inst))
return hash_combine(EVI->getOpcode(), EVI->getOperand(0),
hash_combine_range(EVI->idx_begin(), EVI->idx_end()));
@@ -279,7 +282,8 @@
assert((isa<CallInst>(Inst) || isa<GetElementPtrInst>(Inst) ||
isa<ExtractElementInst>(Inst) || isa<InsertElementInst>(Inst) ||
- isa<ShuffleVectorInst>(Inst) || isa<UnaryOperator>(Inst)) &&
+ isa<ShuffleVectorInst>(Inst) || isa<UnaryOperator>(Inst) ||
+ isa<FreezeInst>(Inst)) &&
"Invalid/unknown instruction");
// Mix in the opcode.
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