[WebAssembly] Represent trap instructions as poison

[pedroclobo]

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

[llvmbot]

@llvm/pr-subscribers-backend-webassembly

Author: Pedro Lobo (pedroclobo)

Changes

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

---

Full diff: https://github.com/llvm/llvm-project/pull/134553.diff

1 Files Affected:

• (modified) llvm/lib/Target/WebAssembly/WebAssemblyLowerRefTypesIntPtrConv.cpp (+1-2)

diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyLowerRefTypesIntPtrConv.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyLowerRefTypesIntPtrConv.cpp
index c61aa5eff4a70..be500de67e320 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyLowerRefTypesIntPtrConv.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyLowerRefTypesIntPtrConv.cpp
@@ -68,8 +68,7 @@ bool WebAssemblyLowerRefTypesIntPtrConv::runOnFunction(Function &F) {
         !(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);