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//===-- AMDGPUFixFunctionBitcasts.cpp - Fix function bitcasts -------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// Promote indirect (bitcast) calls to direct calls when they are statically
/// known to be direct. Required when InstCombine is not run (e.g. at OptNone)
/// because AMDGPU does not support indirect calls.
///
//===----------------------------------------------------------------------===//
#include "AMDGPU.h"
#include "llvm/IR/InstVisitor.h"
#include "llvm/Pass.h"
#include "llvm/Transforms/Utils/CallPromotionUtils.h"
using namespace llvm;
#define DEBUG_TYPE "amdgpu-fix-function-bitcasts"
namespace {
class AMDGPUFixFunctionBitcasts final
: public ModulePass,
public InstVisitor<AMDGPUFixFunctionBitcasts> {
bool runOnModule(Module &M) override;
bool Modified;
public:
void visitCallBase(CallBase &CB) {
if (CB.getCalledFunction())
return;
auto *Callee =
dyn_cast<Function>(CB.getCalledOperand()->stripPointerCasts());
if (Callee && isLegalToPromote(CB, Callee)) {
promoteCall(CB, Callee);
Modified = true;
}
}
static char ID;
AMDGPUFixFunctionBitcasts() : ModulePass(ID) {}
};
} // End anonymous namespace
char AMDGPUFixFunctionBitcasts::ID = 0;
char &llvm::AMDGPUFixFunctionBitcastsID = AMDGPUFixFunctionBitcasts::ID;
INITIALIZE_PASS(AMDGPUFixFunctionBitcasts, DEBUG_TYPE,
"Fix function bitcasts for AMDGPU", false, false)
ModulePass *llvm::createAMDGPUFixFunctionBitcastsPass() {
return new AMDGPUFixFunctionBitcasts();
}
bool AMDGPUFixFunctionBitcasts::runOnModule(Module &M) {
Modified = false;
visit(M);
return Modified;
}
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