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      1 //===-- AMDGPUFixFunctionBitcasts.cpp - Fix function bitcasts -------------===//
      2 //
      3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
      4 // See https://llvm.org/LICENSE.txt for license information.
      5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
      6 //
      7 //===----------------------------------------------------------------------===//
      8 ///
      9 /// \file
     10 /// Promote indirect (bitcast) calls to direct calls when they are statically
     11 /// known to be direct. Required when InstCombine is not run (e.g. at OptNone)
     12 /// because AMDGPU does not support indirect calls.
     13 ///
     14 //===----------------------------------------------------------------------===//
     15 
     16 #include "AMDGPU.h"
     17 #include "llvm/IR/InstVisitor.h"
     18 #include "llvm/Pass.h"
     19 #include "llvm/Transforms/Utils/CallPromotionUtils.h"
     20 
     21 using namespace llvm;
     22 
     23 #define DEBUG_TYPE "amdgpu-fix-function-bitcasts"
     24 
     25 namespace {
     26 class AMDGPUFixFunctionBitcasts final
     27     : public ModulePass,
     28       public InstVisitor<AMDGPUFixFunctionBitcasts> {
     29 
     30   bool runOnModule(Module &M) override;
     31 
     32   bool Modified;
     33 
     34 public:
     35   void visitCallBase(CallBase &CB) {
     36     if (CB.getCalledFunction())
     37       return;
     38     auto *Callee =
     39         dyn_cast<Function>(CB.getCalledOperand()->stripPointerCasts());
     40     if (Callee && isLegalToPromote(CB, Callee)) {
     41       promoteCall(CB, Callee);
     42       Modified = true;
     43     }
     44   }
     45 
     46   static char ID;
     47   AMDGPUFixFunctionBitcasts() : ModulePass(ID) {}
     48 };
     49 } // End anonymous namespace
     50 
     51 char AMDGPUFixFunctionBitcasts::ID = 0;
     52 char &llvm::AMDGPUFixFunctionBitcastsID = AMDGPUFixFunctionBitcasts::ID;
     53 INITIALIZE_PASS(AMDGPUFixFunctionBitcasts, DEBUG_TYPE,
     54                 "Fix function bitcasts for AMDGPU", false, false)
     55 
     56 ModulePass *llvm::createAMDGPUFixFunctionBitcastsPass() {
     57   return new AMDGPUFixFunctionBitcasts();
     58 }
     59 
     60 bool AMDGPUFixFunctionBitcasts::runOnModule(Module &M) {
     61   Modified = false;
     62   visit(M);
     63   return Modified;
     64 }
     65