commit 0ab2061c4fd0feac8b142ff76ed823534bebc634
author Pedro Lobo <pedro.lobo@tecnico.ulisboa.pt> Mon Apr 07 14:29:55 2025 +0100
committer GitHub <noreply@github.com> Mon Apr 07 14:29:55 2025 +0100
tree ffae54e55eec60a49af92d2c4a5f5cd21f10173a
parent 771b94fa834b71cfcb0c16b875f656c7facdcb2f

[WebAssembly] Represent trap instructions as `poison` (#134553)

The WebAssemblyLowerRefTypesIntPtrConv pass currently uses `undef` to
represent trap instructions. These can instead be represented by the
`poison` value.

llvm/lib/Target/WebAssembly/WebAssemblyLowerRefTypesIntPtrConv.cpp

diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyLowerRefTypesIntPtrConv.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyLowerRefTypesIntPtrConv.cpp
index c61aa5e..be500de 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyLowerRefTypesIntPtrConv.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyLowerRefTypesIntPtrConv.cpp
@@ -68,8 +68,7 @@
         !(ITP && WebAssembly::isWebAssemblyReferenceType(ITP->getDestTy())))
       continue;
 
-    UndefValue *U = UndefValue::get(I->getType());
-    I->replaceAllUsesWith(U);
+    I->replaceAllUsesWith(PoisonValue::get(I->getType()));
 
     Function *TrapIntrin =
         Intrinsic::getOrInsertDeclaration(F.getParent(), Intrinsic::debugtrap);