forked from OSchip/llvm-project
78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
//===- NVPTXSplitBBatBar.cpp - Split BB at Barrier --*- C++ -*--===//
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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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// Split basic blocks so that a basic block that contains a barrier instruction
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// only contains the barrier instruction.
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//
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//===----------------------------------------------------------------------===//
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#include "NVPTXSplitBBatBar.h"
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#include "NVPTXUtilities.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/IntrinsicInst.h"
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#include "llvm/IR/Intrinsics.h"
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#include "llvm/Support/InstIterator.h"
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using namespace llvm;
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namespace llvm {
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FunctionPass *createSplitBBatBarPass();
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}
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char NVPTXSplitBBatBar::ID = 0;
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bool NVPTXSplitBBatBar::runOnFunction(Function &F) {
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SmallVector<Instruction *, 4> SplitPoints;
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bool changed = false;
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// Collect all the split points in SplitPoints
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for (Function::iterator BI = F.begin(), BE = F.end(); BI != BE; ++BI) {
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BasicBlock::iterator IB = BI->begin();
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BasicBlock::iterator II = IB;
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BasicBlock::iterator IE = BI->end();
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// Skit the first intruction. No splitting is needed at this
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// point even if this is a bar.
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while (II != IE) {
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if (IntrinsicInst *inst = dyn_cast<IntrinsicInst>(II)) {
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Intrinsic::ID id = inst->getIntrinsicID();
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// If this is a barrier, split at this instruction
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// and the next instruction.
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if (llvm::isBarrierIntrinsic(id)) {
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if (II != IB)
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SplitPoints.push_back(II);
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II++;
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if ((II != IE) && (!II->isTerminator())) {
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SplitPoints.push_back(II);
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II++;
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}
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continue;
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}
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}
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II++;
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}
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}
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for (unsigned i = 0; i != SplitPoints.size(); i++) {
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changed = true;
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Instruction *inst = SplitPoints[i];
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inst->getParent()->splitBasicBlock(inst, "bar_split");
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}
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return changed;
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}
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// This interface will most likely not be necessary, because this pass will
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// not be invoked by the driver, but will be used as a prerequisite to
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// another pass.
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FunctionPass *llvm::createSplitBBatBarPass() {
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return new NVPTXSplitBBatBar();
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}
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