Resolving #171877 #172139
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Resolving #171877 #172139
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Moved constant folding logic from SimplifyLibCalls.cpp to ConstantFoldLibCall2
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@llvm/pr-subscribers-llvm-analysis @llvm/pr-subscribers-llvm-transforms Author: Ron Xavier (Ronxvier) ChangesMoved constant folding logic from SimplifyLibCalls.cpp to ConstantFoldLibCall2 Full diff: https://github.com/llvm/llvm-project/pull/172139.diff 2 Files Affected:
diff --git a/llvm/lib/Analysis/ConstantFolding.cpp b/llvm/lib/Analysis/ConstantFolding.cpp
index a9b51065a1d99..8a73c02bc363e 100644
--- a/llvm/lib/Analysis/ConstantFolding.cpp
+++ b/llvm/lib/Analysis/ConstantFolding.cpp
@@ -3241,6 +3241,18 @@ static Constant *ConstantFoldLibCall2(StringRef Name, Type *Ty,
if (TLI->has(Func))
return ConstantFoldBinaryFP(atan2, Op1V, Op2V, Ty);
break;
+ case LibFunc_fdim:
+ case LibFunc_fdimf:
+ case LibFunc_fdiml:
+ if (TLI->has(Func)){
+ APFloat Difference = Op1V;
+ Difference.subtract(Op2V, RoundingMode::NearestTiesToEven);
+
+ APFloat MaxVal =
+ maximum(Difference, APFloat::getZero(Ty->getFltSemantics()));
+ return ConstantFP::get(Ty->getContext(), MaxVal);
+ }
+ break;
}
return nullptr;
diff --git a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
index c3537f544c432..55cd08b3de855 100644
--- a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -3201,18 +3201,8 @@ Value *LibCallSimplifier::optimizeFdim(CallInst *CI, IRBuilderBase &B) {
if (isa<PoisonValue>(CI->getArgOperand(1)))
return CI->getArgOperand(1);
- const APFloat *X, *Y;
- // Check if both values are constants
- if (!match(CI->getArgOperand(0), m_APFloat(X)) ||
- !match(CI->getArgOperand(1), m_APFloat(Y)))
- return nullptr;
-
- APFloat Difference = *X;
- Difference.subtract(*Y, RoundingMode::NearestTiesToEven);
-
- APFloat MaxVal =
- maximum(Difference, APFloat::getZero(CI->getType()->getFltSemantics()));
- return ConstantFP::get(CI->getType(), MaxVal);
+ // Constant folding will be handled by ConstantFoldLibCall2
+ return nullptr;
}
//===----------------------------------------------------------------------===//
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You can test this locally with the following command:git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Analysis/ConstantFolding.cpp llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp --diff_from_common_commit
View the diff from clang-format here.diff --git a/llvm/lib/Analysis/ConstantFolding.cpp b/llvm/lib/Analysis/ConstantFolding.cpp
index 8a73c02bc..55dfca551 100644
--- a/llvm/lib/Analysis/ConstantFolding.cpp
+++ b/llvm/lib/Analysis/ConstantFolding.cpp
@@ -3244,15 +3244,15 @@ static Constant *ConstantFoldLibCall2(StringRef Name, Type *Ty,
case LibFunc_fdim:
case LibFunc_fdimf:
case LibFunc_fdiml:
- if (TLI->has(Func)){
- APFloat Difference = Op1V;
- Difference.subtract(Op2V, RoundingMode::NearestTiesToEven);
+ if (TLI->has(Func)) {
+ APFloat Difference = Op1V;
+ Difference.subtract(Op2V, RoundingMode::NearestTiesToEven);
- APFloat MaxVal =
- maximum(Difference, APFloat::getZero(Ty->getFltSemantics()));
- return ConstantFP::get(Ty->getContext(), MaxVal);
- }
- break;
+ APFloat MaxVal =
+ maximum(Difference, APFloat::getZero(Ty->getFltSemantics()));
+ return ConstantFP::get(Ty->getContext(), MaxVal);
+ }
+ break;
}
return nullptr;
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🐧 Linux x64 Test Results
Failed Tests(click on a test name to see its output) LLVMLLVM.Transforms/InstCombine/fdim.llLLVM.Transforms/InstCombine/win-fdim.llIf these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the |
🪟 Windows x64 Test Results
Failed Tests(click on a test name to see its output) LLVMLLVM.Transforms/InstCombine/fdim.llLLVM.Transforms/InstCombine/win-fdim.llIf these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the |
Might be an overguarding issue
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Moved constant folding logic from SimplifyLibCalls.cpp to ConstantFoldLibCall2
Meant to resolve #171877