Hopefully fix UB

Mark-Simulacrum · Mark-Simulacrum · commit d9891211da5a · 2024-04-14T15:23:56.000-04:00
diff --git a/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
@@ -1530,7 +1530,7 @@ extern "C" LLVMValueRef LLVMRustBuildCall(LLVMBuilderRef B, LLVMTypeRef Ty, LLVM
   FunctionType *FTy = unwrap<FunctionType>(Ty);
   return wrap(unwrap(B)->CreateCall(
       FTy, Callee, ArrayRef<Value*>(unwrap(Args), NumArgs),
-      ArrayRef<OperandBundleDef>(*OpBundles, NumOpBundles)));
+      NumOpBundles == 0 ? ArrayRef<OperandBundleDef>() : ArrayRef<OperandBundleDef>(*OpBundles, NumOpBundles)));
 }
 
 extern "C" LLVMValueRef LLVMRustGetInstrProfIncrementIntrinsic(LLVMModuleRef M) {

Original file line number	Diff line number	Diff line change
`@@ -1530,7 +1530,7 @@ extern "C" LLVMValueRef LLVMRustBuildCall(LLVMBuilderRef B, LLVMTypeRef Ty, LLVM`
`1530`	`1530`	`FunctionType *FTy = unwrap<FunctionType>(Ty);`
`1531`	`1531`	`return wrap(unwrap(B)->CreateCall(`
`1532`	`1532`	`FTy, Callee, ArrayRef<Value*>(unwrap(Args), NumArgs),`
`1533`		`- ArrayRef<OperandBundleDef>(*OpBundles, NumOpBundles)));`
	`1533`	`+ NumOpBundles == 0 ? ArrayRef<OperandBundleDef>() : ArrayRef<OperandBundleDef>(*OpBundles, NumOpBundles)));`
`1534`	`1534`	`}`
`1535`	`1535`
`1536`	`1536`	`extern "C" LLVMValueRef LLVMRustGetInstrProfIncrementIntrinsic(LLVMModuleRef M) {`