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Add code to call FastISel, and a command-line option to enable it.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55015 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2008-08-19 22:33:34 +00:00
parent 6f2766d597
commit 78eca170e9
1 changed files with 32 additions and 1 deletions
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33
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -26,6 +26,7 @@
#include "llvm/Intrinsics.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/ParameterAttributes.h"
#include "llvm/CodeGen/FastISel.h"
#include "llvm/CodeGen/GCStrategy.h"
#include "llvm/CodeGen/GCMetadata.h"
#include "llvm/CodeGen/MachineFunction.h"
@ -55,6 +56,9 @@ static cl::opt<bool>
EnableValueProp("enable-value-prop", cl::Hidden);
static cl::opt<bool>
EnableLegalizeTypes("enable-legalize-types", cl::Hidden);
static cl::opt<bool>
EnableFastISel("fast-isel", cl::Hidden,
cl::desc("Enable the experimental \"fast\" instruction selector"));
#ifndef NDEBUG
@ -5091,12 +5095,39 @@ void SelectionDAGISel::BuildSelectionDAG(SelectionDAG &DAG, BasicBlock *LLVMBB,
std::vector<std::pair<MachineInstr*, unsigned> > &PHINodesToUpdate,
FunctionLoweringInfo &FuncInfo) {
SelectionDAGLowering SDL(DAG, TLI, *AA, FuncInfo, GFI);
BB = FuncInfo.MBBMap[LLVMBB];
// Before doing SelectionDAG ISel, see if FastISel has been requested.
// FastISel doesn't currently support entry blocks, because that
// requires special handling for arguments. And it doesn't support EH
// landing pads, which also require special handling.
// For now, also exclude blocks with terminators that aren't
// unconditional branches.
if (EnableFastISel &&
LLVMBB != &LLVMBB->getParent()->getEntryBlock() &&
!BB->isLandingPad() &&
isa<BranchInst>(LLVMBB->getTerminator()) &&
cast<BranchInst>(LLVMBB->getTerminator())->isUnconditional()) {
if (FastISel *F = TLI.createFastISel(BB, &FuncInfo.MF,
TLI.getTargetMachine().getInstrInfo())) {
BasicBlock::iterator I =
F->SelectInstructions(LLVMBB->begin(), LLVMBB->end(), FuncInfo.ValueMap);
if (I == LLVMBB->end())
// The "fast" selector selected the entire block, so we're done.
return;
// The "fast" selector couldn't handle something and bailed.
// For the temporary purpose of debugging, just abort.
I->dump();
assert(0 && "FastISel didn't select the entire block");
abort();
}
}
// Lower any arguments needed in this block if this is the entry block.
if (LLVMBB == &LLVMBB->getParent()->getEntryBlock())
LowerArguments(LLVMBB, SDL);
BB = FuncInfo.MBBMap[LLVMBB];
SDL.setCurrentBasicBlock(BB);
MachineModuleInfo *MMI = DAG.getMachineModuleInfo();