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[CodeGen] Change placeholder from undef to poison #134731

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Merged
merged 1 commit into from
Apr 8, 2025

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Fill default values of a map with poison instead of undef. There should be no functional difference as the default values are overridden later.

Fill default values of a map with `poison` instead of `undef`.
There should be no functional difference as the default values are
overridden later.
@llvmbot llvmbot added clang Clang issues not falling into any other category clang:codegen IR generation bugs: mangling, exceptions, etc. labels Apr 7, 2025
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llvmbot commented Apr 7, 2025

@llvm/pr-subscribers-clang-codegen

Author: Pedro Lobo (pedroclobo)

Changes

Fill default values of a map with poison instead of undef. There should be no functional difference as the default values are overridden later.


Full diff: https://github.com/llvm/llvm-project/pull/134731.diff

1 Files Affected:

  • (modified) clang/lib/CodeGen/MicrosoftCXXABI.cpp (+1-1)
diff --git a/clang/lib/CodeGen/MicrosoftCXXABI.cpp b/clang/lib/CodeGen/MicrosoftCXXABI.cpp
index ba5f74f153d59..7bef436302526 100644
--- a/clang/lib/CodeGen/MicrosoftCXXABI.cpp
+++ b/clang/lib/CodeGen/MicrosoftCXXABI.cpp
@@ -370,7 +370,7 @@ class MicrosoftCXXABI : public CGCXXABI {
     MicrosoftVTableContext &VTContext = CGM.getMicrosoftVTableContext();
     unsigned NumEntries = 1 + SrcRD->getNumVBases();
     SmallVector<llvm::Constant *, 4> Map(NumEntries,
-                                         llvm::UndefValue::get(CGM.IntTy));
+                                         llvm::PoisonValue::get(CGM.IntTy));
     Map[0] = llvm::ConstantInt::get(CGM.IntTy, 0);
     bool AnyDifferent = false;
     for (const auto &I : SrcRD->vbases()) {

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llvmbot commented Apr 7, 2025

@llvm/pr-subscribers-clang

Author: Pedro Lobo (pedroclobo)

Changes

Fill default values of a map with poison instead of undef. There should be no functional difference as the default values are overridden later.


Full diff: https://github.com/llvm/llvm-project/pull/134731.diff

1 Files Affected:

  • (modified) clang/lib/CodeGen/MicrosoftCXXABI.cpp (+1-1)
diff --git a/clang/lib/CodeGen/MicrosoftCXXABI.cpp b/clang/lib/CodeGen/MicrosoftCXXABI.cpp
index ba5f74f153d59..7bef436302526 100644
--- a/clang/lib/CodeGen/MicrosoftCXXABI.cpp
+++ b/clang/lib/CodeGen/MicrosoftCXXABI.cpp
@@ -370,7 +370,7 @@ class MicrosoftCXXABI : public CGCXXABI {
     MicrosoftVTableContext &VTContext = CGM.getMicrosoftVTableContext();
     unsigned NumEntries = 1 + SrcRD->getNumVBases();
     SmallVector<llvm::Constant *, 4> Map(NumEntries,
-                                         llvm::UndefValue::get(CGM.IntTy));
+                                         llvm::PoisonValue::get(CGM.IntTy));
     Map[0] = llvm::ConstantInt::get(CGM.IntTy, 0);
     bool AnyDifferent = false;
     for (const auto &I : SrcRD->vbases()) {

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LGTM

@pedroclobo pedroclobo merged commit bb50061 into llvm:main Apr 8, 2025
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@pedroclobo pedroclobo deleted the ms-poison branch April 8, 2025 08:50
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3 participants