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must be called in the pass's constructor. This function uses static dependency declarations to recursively initialize the pass's dependencies. Clients that only create passes through the createFooPass() APIs will require no changes. Clients that want to use the CommandLine options for passes will need to manually call the appropriate initialization functions in PassInitialization.h before parsing commandline arguments. I have tested this with all standard configurations of clang and llvm-gcc on Darwin. It is possible that there are problems with the static dependencies that will only be visible with non-standard options. If you encounter any crash in pass registration/creation, please send the testcase to me directly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116820 91177308-0d34-0410-b5e6-96231b3b80d8
140 lines
4.3 KiB
C++
140 lines
4.3 KiB
C++
//===- LowerAtomic.cpp - Lower atomic intrinsics --------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This pass lowers atomic intrinsics to non-atomic form for use in a known
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// non-preemptible environment.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "loweratomic"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Function.h"
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#include "llvm/IntrinsicInst.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/IRBuilder.h"
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using namespace llvm;
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static bool LowerAtomicIntrinsic(IntrinsicInst *II) {
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IRBuilder<> Builder(II->getParent(), II);
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unsigned IID = II->getIntrinsicID();
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switch (IID) {
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case Intrinsic::memory_barrier:
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break;
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case Intrinsic::atomic_load_add:
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case Intrinsic::atomic_load_sub:
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case Intrinsic::atomic_load_and:
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case Intrinsic::atomic_load_nand:
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case Intrinsic::atomic_load_or:
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case Intrinsic::atomic_load_xor:
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case Intrinsic::atomic_load_max:
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case Intrinsic::atomic_load_min:
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case Intrinsic::atomic_load_umax:
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case Intrinsic::atomic_load_umin: {
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Value *Ptr = II->getArgOperand(0), *Delta = II->getArgOperand(1);
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LoadInst *Orig = Builder.CreateLoad(Ptr);
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Value *Res = NULL;
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switch (IID) {
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default: assert(0 && "Unrecognized atomic modify operation");
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case Intrinsic::atomic_load_add:
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Res = Builder.CreateAdd(Orig, Delta);
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break;
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case Intrinsic::atomic_load_sub:
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Res = Builder.CreateSub(Orig, Delta);
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break;
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case Intrinsic::atomic_load_and:
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Res = Builder.CreateAnd(Orig, Delta);
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break;
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case Intrinsic::atomic_load_nand:
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Res = Builder.CreateNot(Builder.CreateAnd(Orig, Delta));
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break;
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case Intrinsic::atomic_load_or:
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Res = Builder.CreateOr(Orig, Delta);
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break;
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case Intrinsic::atomic_load_xor:
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Res = Builder.CreateXor(Orig, Delta);
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break;
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case Intrinsic::atomic_load_max:
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Res = Builder.CreateSelect(Builder.CreateICmpSLT(Orig, Delta),
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Delta, Orig);
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break;
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case Intrinsic::atomic_load_min:
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Res = Builder.CreateSelect(Builder.CreateICmpSLT(Orig, Delta),
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Orig, Delta);
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break;
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case Intrinsic::atomic_load_umax:
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Res = Builder.CreateSelect(Builder.CreateICmpULT(Orig, Delta),
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Delta, Orig);
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break;
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case Intrinsic::atomic_load_umin:
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Res = Builder.CreateSelect(Builder.CreateICmpULT(Orig, Delta),
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Orig, Delta);
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break;
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}
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Builder.CreateStore(Res, Ptr);
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II->replaceAllUsesWith(Orig);
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break;
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}
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case Intrinsic::atomic_swap: {
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Value *Ptr = II->getArgOperand(0), *Val = II->getArgOperand(1);
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LoadInst *Orig = Builder.CreateLoad(Ptr);
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Builder.CreateStore(Val, Ptr);
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II->replaceAllUsesWith(Orig);
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break;
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}
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case Intrinsic::atomic_cmp_swap: {
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Value *Ptr = II->getArgOperand(0), *Cmp = II->getArgOperand(1);
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Value *Val = II->getArgOperand(2);
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LoadInst *Orig = Builder.CreateLoad(Ptr);
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Value *Equal = Builder.CreateICmpEQ(Orig, Cmp);
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Value *Res = Builder.CreateSelect(Equal, Val, Orig);
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Builder.CreateStore(Res, Ptr);
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II->replaceAllUsesWith(Orig);
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break;
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}
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default:
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return false;
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}
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assert(II->use_empty() &&
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"Lowering should have eliminated any uses of the intrinsic call!");
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II->eraseFromParent();
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return true;
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}
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namespace {
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struct LowerAtomic : public BasicBlockPass {
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static char ID;
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LowerAtomic() : BasicBlockPass(ID) {
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initializeLowerAtomicPass(*PassRegistry::getPassRegistry());
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}
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bool runOnBasicBlock(BasicBlock &BB) {
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bool Changed = false;
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for (BasicBlock::iterator DI = BB.begin(), DE = BB.end(); DI != DE; )
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if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(DI++))
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Changed |= LowerAtomicIntrinsic(II);
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return Changed;
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}
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};
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}
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char LowerAtomic::ID = 0;
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INITIALIZE_PASS(LowerAtomic, "loweratomic",
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"Lower atomic intrinsics to non-atomic form",
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false, false)
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Pass *llvm::createLowerAtomicPass() { return new LowerAtomic(); }
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