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Add code to call FastISel, and a command-line option to enable it.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55015 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -26,6 +26,7 @@
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#include "llvm/Intrinsics.h"
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#include "llvm/IntrinsicInst.h"
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#include "llvm/ParameterAttributes.h"
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#include "llvm/CodeGen/FastISel.h"
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#include "llvm/CodeGen/GCStrategy.h"
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#include "llvm/CodeGen/GCMetadata.h"
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#include "llvm/CodeGen/MachineFunction.h"
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@ -55,6 +56,9 @@ static cl::opt<bool>
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EnableValueProp("enable-value-prop", cl::Hidden);
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static cl::opt<bool>
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EnableLegalizeTypes("enable-legalize-types", cl::Hidden);
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static cl::opt<bool>
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EnableFastISel("fast-isel", cl::Hidden,
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cl::desc("Enable the experimental \"fast\" instruction selector"));
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#ifndef NDEBUG
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@ -5091,12 +5095,39 @@ void SelectionDAGISel::BuildSelectionDAG(SelectionDAG &DAG, BasicBlock *LLVMBB,
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std::vector<std::pair<MachineInstr*, unsigned> > &PHINodesToUpdate,
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FunctionLoweringInfo &FuncInfo) {
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SelectionDAGLowering SDL(DAG, TLI, *AA, FuncInfo, GFI);
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BB = FuncInfo.MBBMap[LLVMBB];
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// Before doing SelectionDAG ISel, see if FastISel has been requested.
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// FastISel doesn't currently support entry blocks, because that
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// requires special handling for arguments. And it doesn't support EH
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// landing pads, which also require special handling.
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// For now, also exclude blocks with terminators that aren't
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// unconditional branches.
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if (EnableFastISel &&
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LLVMBB != &LLVMBB->getParent()->getEntryBlock() &&
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!BB->isLandingPad() &&
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isa<BranchInst>(LLVMBB->getTerminator()) &&
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cast<BranchInst>(LLVMBB->getTerminator())->isUnconditional()) {
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if (FastISel *F = TLI.createFastISel(BB, &FuncInfo.MF,
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TLI.getTargetMachine().getInstrInfo())) {
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BasicBlock::iterator I =
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F->SelectInstructions(LLVMBB->begin(), LLVMBB->end(), FuncInfo.ValueMap);
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if (I == LLVMBB->end())
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// The "fast" selector selected the entire block, so we're done.
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return;
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// The "fast" selector couldn't handle something and bailed.
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// For the temporary purpose of debugging, just abort.
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I->dump();
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assert(0 && "FastISel didn't select the entire block");
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abort();
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}
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}
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// Lower any arguments needed in this block if this is the entry block.
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if (LLVMBB == &LLVMBB->getParent()->getEntryBlock())
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LowerArguments(LLVMBB, SDL);
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BB = FuncInfo.MBBMap[LLVMBB];
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SDL.setCurrentBasicBlock(BB);
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MachineModuleInfo *MMI = DAG.getMachineModuleInfo();
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