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//=== WebAssemblyPreLegalizerCombiner.cpp ---------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This pass does combining of machine instructions at the generic MI level,
// before the legalizer.
//
//===----------------------------------------------------------------------===//
#include "WebAssembly.h"
#include "WebAssemblySubtarget.h"
#include "llvm/CodeGen/GlobalISel/CSEInfo.h"
#include "llvm/CodeGen/GlobalISel/Combiner.h"
#include "llvm/CodeGen/GlobalISel/CombinerHelper.h"
#include "llvm/CodeGen/GlobalISel/CombinerInfo.h"
#include "llvm/CodeGen/GlobalISel/GIMatchTableExecutorImpl.h"
#include "llvm/CodeGen/GlobalISel/GISelValueTracking.h"
#include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/TargetPassConfig.h"
#include "llvm/Target/TargetMachine.h"
#define GET_GICOMBINER_DEPS
#include "WebAssemblyGenPreLegalizeGICombiner.inc"
#undef GET_GICOMBINER_DEPS
#define DEBUG_TYPE "wasm-prelegalizer-combiner"
using namespace llvm;
namespace {
#define GET_GICOMBINER_TYPES
#include "WebAssemblyGenPreLegalizeGICombiner.inc"
#undef GET_GICOMBINER_TYPES
class WebAssemblyPreLegalizerCombinerImpl : public Combiner {
protected:
const CombinerHelper Helper;
const WebAssemblyPreLegalizerCombinerImplRuleConfig &RuleConfig;
const WebAssemblySubtarget &STI;
public:
WebAssemblyPreLegalizerCombinerImpl(
MachineFunction &MF, CombinerInfo &CInfo, const TargetPassConfig *TPC,
GISelValueTracking &VT, GISelCSEInfo *CSEInfo,
const WebAssemblyPreLegalizerCombinerImplRuleConfig &RuleConfig,
const WebAssemblySubtarget &STI, MachineDominatorTree *MDT,
const LegalizerInfo *LI);
static const char *getName() { return "WebAssembly00PreLegalizerCombiner"; }
bool tryCombineAll(MachineInstr &I) const override;
private:
#define GET_GICOMBINER_CLASS_MEMBERS
#include "WebAssemblyGenPreLegalizeGICombiner.inc"
#undef GET_GICOMBINER_CLASS_MEMBERS
};
#define GET_GICOMBINER_IMPL
#include "WebAssemblyGenPreLegalizeGICombiner.inc"
#undef GET_GICOMBINER_IMPL
WebAssemblyPreLegalizerCombinerImpl::WebAssemblyPreLegalizerCombinerImpl(
MachineFunction &MF, CombinerInfo &CInfo, const TargetPassConfig *TPC,
GISelValueTracking &VT, GISelCSEInfo *CSEInfo,
const WebAssemblyPreLegalizerCombinerImplRuleConfig &RuleConfig,
const WebAssemblySubtarget &STI, MachineDominatorTree *MDT,
const LegalizerInfo *LI)
: Combiner(MF, CInfo, TPC, &VT, CSEInfo),
Helper(Observer, B, /*IsPreLegalize*/ true, &VT, MDT, LI),
RuleConfig(RuleConfig), STI(STI),
#define GET_GICOMBINER_CONSTRUCTOR_INITS
#include "WebAssemblyGenPreLegalizeGICombiner.inc"
#undef GET_GICOMBINER_CONSTRUCTOR_INITS
{
}
// Pass boilerplate
// ================
class WebAssemblyPreLegalizerCombiner : public MachineFunctionPass {
public:
static char ID;
WebAssemblyPreLegalizerCombiner();
StringRef getPassName() const override {
return "WebAssemblyPreLegalizerCombiner";
}
bool runOnMachineFunction(MachineFunction &MF) override;
void getAnalysisUsage(AnalysisUsage &AU) const override;
private:
WebAssemblyPreLegalizerCombinerImplRuleConfig RuleConfig;
};
} // end anonymous namespace
void WebAssemblyPreLegalizerCombiner::getAnalysisUsage(
AnalysisUsage &AU) const {
AU.addRequired<TargetPassConfig>();
AU.setPreservesCFG();
getSelectionDAGFallbackAnalysisUsage(AU);
AU.addRequired<GISelValueTrackingAnalysisLegacy>();
AU.addPreserved<GISelValueTrackingAnalysisLegacy>();
AU.addRequired<MachineDominatorTreeWrapperPass>();
AU.addPreserved<MachineDominatorTreeWrapperPass>();
AU.addRequired<GISelCSEAnalysisWrapperPass>();
AU.addPreserved<GISelCSEAnalysisWrapperPass>();
MachineFunctionPass::getAnalysisUsage(AU);
}
WebAssemblyPreLegalizerCombiner::WebAssemblyPreLegalizerCombiner()
: MachineFunctionPass(ID) {
if (!RuleConfig.parseCommandLineOption())
report_fatal_error("Invalid rule identifier");
}
bool WebAssemblyPreLegalizerCombiner::runOnMachineFunction(
MachineFunction &MF) {
if (MF.getProperties().hasFailedISel())
return false;
auto &TPC = getAnalysis<TargetPassConfig>();
// Enable CSE.
GISelCSEAnalysisWrapper &Wrapper =
getAnalysis<GISelCSEAnalysisWrapperPass>().getCSEWrapper();
auto *CSEInfo = &Wrapper.get(TPC.getCSEConfig());
const WebAssemblySubtarget &ST = MF.getSubtarget<WebAssemblySubtarget>();
const auto *LI = ST.getLegalizerInfo();
const Function &F = MF.getFunction();
bool EnableOpt =
MF.getTarget().getOptLevel() != CodeGenOptLevel::None && !skipFunction(F);
GISelValueTracking *VT =
&getAnalysis<GISelValueTrackingAnalysisLegacy>().get(MF);
MachineDominatorTree *MDT =
&getAnalysis<MachineDominatorTreeWrapperPass>().getDomTree();
CombinerInfo CInfo(/*AllowIllegalOps*/ true, /*ShouldLegalizeIllegal*/ false,
/*LegalizerInfo*/ nullptr, EnableOpt, F.hasOptSize(),
F.hasMinSize());
// Disable fixed-point iteration to reduce compile-time
CInfo.MaxIterations = 1;
CInfo.ObserverLvl = CombinerInfo::ObserverLevel::SinglePass;
// This is the first Combiner, so the input IR might contain dead
// instructions.
CInfo.EnableFullDCE = true;
WebAssemblyPreLegalizerCombinerImpl Impl(MF, CInfo, &TPC, *VT, CSEInfo,
RuleConfig, ST, MDT, LI);
return Impl.combineMachineInstrs();
}
char WebAssemblyPreLegalizerCombiner::ID = 0;
INITIALIZE_PASS_BEGIN(WebAssemblyPreLegalizerCombiner, DEBUG_TYPE,
"Combine WebAssembly machine instrs before legalization",
false, false)
INITIALIZE_PASS_DEPENDENCY(TargetPassConfig)
INITIALIZE_PASS_DEPENDENCY(GISelValueTrackingAnalysisLegacy)
INITIALIZE_PASS_DEPENDENCY(GISelCSEAnalysisWrapperPass)
INITIALIZE_PASS_END(WebAssemblyPreLegalizerCombiner, DEBUG_TYPE,
"Combine WebAssembly machine instrs before legalization",
false, false)
FunctionPass *llvm::createWebAssemblyPreLegalizerCombiner() {
return new WebAssemblyPreLegalizerCombiner();
}
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