[WebAssembly] Use IRBuilder in FixFunctionBitcasts (NFC)

[kleisauke]

Simplifies the code a bit.

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[llvmbot]

@llvm/pr-subscribers-backend-webassembly

Author: Kleis Auke Wolthuizen (kleisauke)

Changes

Simplifies the code a bit.

---

Full diff: https://github.com/llvm/llvm-project/pull/164268.diff

1 Files Affected:

• (modified) llvm/lib/Target/WebAssembly/WebAssemblyFixFunctionBitcasts.cpp (+10-15)

diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyFixFunctionBitcasts.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyFixFunctionBitcasts.cpp
index 37a34573bb339..a6b2d4786cd8b 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyFixFunctionBitcasts.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyFixFunctionBitcasts.cpp
@@ -24,6 +24,7 @@
 
 #include "WebAssembly.h"
 #include "llvm/IR/Constants.h"
+#include "llvm/IR/IRBuilder.h"
 #include "llvm/IR/Instructions.h"
 #include "llvm/IR/Module.h"
 #include "llvm/IR/Operator.h"
@@ -114,6 +115,7 @@ static Function *createWrapper(Function *F, FunctionType *Ty) {
   Wrapper->setAttributes(F->getAttributes());
   BasicBlock *BB = BasicBlock::Create(M->getContext(), "body", Wrapper);
   const DataLayout &DL = BB->getDataLayout();
+  IRBuilder<> Builder(BB);
 
   // Determine what arguments to pass.
   SmallVector<Value *, 4> Args;
@@ -140,10 +142,7 @@ static Function *createWrapper(Function *F, FunctionType *Ty) {
       Args.push_back(&*AI);
     } else {
       if (CastInst::isBitOrNoopPointerCastable(ArgType, ParamType, DL)) {
-        Instruction *PtrCast =
-            CastInst::CreateBitOrPointerCast(AI, ParamType, "cast");
-        PtrCast->insertInto(BB, BB->end());
-        Args.push_back(PtrCast);
+        Args.push_back(Builder.CreateBitOrPointerCast(AI, ParamType, "cast"));
       } else if (ArgType->isStructTy() || ParamType->isStructTy()) {
         LLVM_DEBUG(dbgs() << "createWrapper: struct param type in bitcast: "
                           << F->getName() << "\n");
@@ -166,24 +165,21 @@ static Function *createWrapper(Function *F, FunctionType *Ty) {
       for (; AI != AE; ++AI)
         Args.push_back(&*AI);
 
-    CallInst *Call = CallInst::Create(F, Args, "", BB);
+    CallInst *Call = Builder.CreateCall(F, Args);
 
     Type *ExpectedRtnType = F->getFunctionType()->getReturnType();
     Type *RtnType = Ty->getReturnType();
     // Determine what value to return.
     if (RtnType->isVoidTy()) {
-      ReturnInst::Create(M->getContext(), BB);
+      Builder.CreateRetVoid();
     } else if (ExpectedRtnType->isVoidTy()) {
       LLVM_DEBUG(dbgs() << "Creating dummy return: " << *RtnType << "\n");
-      ReturnInst::Create(M->getContext(), PoisonValue::get(RtnType), BB);
+      Builder.CreateRet(PoisonValue::get(RtnType));
     } else if (RtnType == ExpectedRtnType) {
-      ReturnInst::Create(M->getContext(), Call, BB);
+      Builder.CreateRet(Call);
     } else if (CastInst::isBitOrNoopPointerCastable(ExpectedRtnType, RtnType,
                                                     DL)) {
-      Instruction *Cast =
-          CastInst::CreateBitOrPointerCast(Call, RtnType, "cast");
-      Cast->insertInto(BB, BB->end());
-      ReturnInst::Create(M->getContext(), Cast, BB);
+      Builder.CreateRet(Builder.CreateBitOrPointerCast(Call, RtnType, "cast"));
     } else if (RtnType->isStructTy() || ExpectedRtnType->isStructTy()) {
       LLVM_DEBUG(dbgs() << "createWrapper: struct return type in bitcast: "
                         << F->getName() << "\n");
@@ -203,9 +199,8 @@ static Function *createWrapper(Function *F, FunctionType *Ty) {
     Wrapper = Function::Create(Ty, Function::PrivateLinkage,
                                F->getName() + "_bitcast_invalid", M);
     Wrapper->setAttributes(F->getAttributes());
-    BasicBlock *BB = BasicBlock::Create(M->getContext(), "body", Wrapper);
-    new UnreachableInst(M->getContext(), BB);
-    Wrapper->setName(F->getName() + "_bitcast_invalid");
+    IRBuilder<> Builder(BasicBlock::Create(M->getContext(), "body", Wrapper));
+    Builder.CreateUnreachable();
   } else if (!WrapperNeeded) {
     LLVM_DEBUG(dbgs() << "createWrapper: no wrapper needed: " << F->getName()
                       << "\n");