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//===- SPIRVLowerSaddWithOverflow.cpp - Lower llvm.sadd.with.overflow -----===//
//
// The LLVM/SPIRV Translator
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
// Copyright (c) 2022 The Khronos Group Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal with the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimers.
// Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimers in the documentation
// and/or other materials provided with the distribution.
// Neither the names of The Khronos Group, nor the names of its
// contributors may be used to endorse or promote products derived from this
// Software without specific prior written permission.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH
// THE SOFTWARE.
//
//===----------------------------------------------------------------------===//
//
// This file implements lowering of llvm.sadd.with.overflow.* into basic LLVM
// operations. Probably, in the future this pass can be generalized for other
// function calls
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "spv-lower-llvm_sadd_with_overflow"
#include "SPIRVLowerSaddWithOverflow.h"
#include "LLVMSaddWithOverflow.h"
#include "LLVMSPIRVLib.h"
#include "SPIRVError.h"
#include "libSPIRV/SPIRVDebug.h"
#include "llvm/IR/InstVisitor.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Module.h"
#include "llvm/IRReader/IRReader.h"
#include "llvm/Linker/Linker.h"
#include "llvm/Support/SourceMgr.h"
using namespace llvm;
using namespace SPIRV;
namespace SPIRV {
void SPIRVLowerSaddWithOverflowBase::visitIntrinsicInst(CallInst &I) {
IntrinsicInst *II = dyn_cast<IntrinsicInst>(&I);
if (!II || II->getIntrinsicID() != Intrinsic::sadd_with_overflow)
return;
Function *IntrinsicFunc = I.getCalledFunction();
assert(IntrinsicFunc && "Missing function");
StringRef IntrinsicName = IntrinsicFunc->getName();
std::string FuncName = "llvm_sadd_with_overflow_i";
if (IntrinsicName.ends_with(".i16"))
FuncName += "16";
else if (IntrinsicName.ends_with(".i32"))
FuncName += "32";
else if (IntrinsicName.ends_with(".i64"))
FuncName += "64";
else {
assert(false &&
"Unsupported overloading of llvm.sadd.with.overflow intrinsic");
return;
}
// Redirect @llvm.sadd.with.overflow.* call to the function we have in
// the loaded module @llvm_sadd_with_overflow_*
Function *F = Mod->getFunction(FuncName);
if (F) { // This function is already linked in.
I.setCalledFunction(F);
return;
}
FunctionCallee FC = Mod->getOrInsertFunction(FuncName, I.getFunctionType());
I.setCalledFunction(FC);
// Read LLVM IR with the intrinsic's implementation
SMDiagnostic Err;
auto MB = MemoryBuffer::getMemBuffer(LLVMSaddWithOverflow);
auto SaddWithOverflowModule =
parseIR(MB->getMemBufferRef(), Err, *Context,
ParserCallbacks([&](StringRef, StringRef) {
return Mod->getDataLayoutStr();
}));
if (!SaddWithOverflowModule) {
std::string ErrMsg;
raw_string_ostream ErrStream(ErrMsg);
Err.print("", ErrStream);
SPIRVErrorLog EL;
EL.checkError(false, SPIRVEC_InvalidLlvmModule, ErrMsg);
return;
}
// Link in the intrinsic's implementation.
if (!Linker::linkModules(*Mod, std::move(SaddWithOverflowModule),
Linker::LinkOnlyNeeded))
TheModuleIsModified = true;
}
bool SPIRVLowerSaddWithOverflowBase::runLowerSaddWithOverflow(Module &M) {
Context = &M.getContext();
Mod = &M;
visit(M);
verifyRegularizationPass(M, "SPIRVLowerSaddWithOverflow");
return TheModuleIsModified;
}
llvm::PreservedAnalyses
SPIRVLowerSaddWithOverflowPass::run(llvm::Module &M,
llvm::ModuleAnalysisManager &MAM) {
return runLowerSaddWithOverflow(M) ? llvm::PreservedAnalyses::none()
: llvm::PreservedAnalyses::all();
}
SPIRVLowerSaddWithOverflowLegacy::SPIRVLowerSaddWithOverflowLegacy()
: ModulePass(ID) {
initializeSPIRVLowerSaddWithOverflowLegacyPass(
*PassRegistry::getPassRegistry());
}
bool SPIRVLowerSaddWithOverflowLegacy::runOnModule(Module &M) {
return runLowerSaddWithOverflow(M);
}
char SPIRVLowerSaddWithOverflowLegacy::ID = 0;
} // namespace SPIRV
INITIALIZE_PASS(SPIRVLowerSaddWithOverflowLegacy,
"spv-lower-llvm_sadd_with_overflow",
"Lower llvm.sadd.with.overflow.* intrinsics", false, false)
ModulePass *llvm::createSPIRVLowerSaddWithOverflowLegacy() {
return new SPIRVLowerSaddWithOverflowLegacy();
}
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