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[GlobalISel] Add a fallback path to SDISel.
When global-isel fails on a MachineFunction MF, MF will be cleaned up and given to SDISel. Thanks to this fallback, we can already perform correctness test even if we support only a small portion of the functions in a test. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@279891 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -53,6 +53,8 @@ namespace llvm {
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/// using the MIR serialization format.
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MachineFunctionPass *createPrintMIRPass(raw_ostream &OS);
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MachineFunctionPass *createResetMachineFunctionPass();
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/// createCodeGenPreparePass - Transform the code to expose more pattern
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/// matching during instruction selection.
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FunctionPass *createCodeGenPreparePass(const TargetMachine *TM = nullptr);
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@ -292,6 +292,7 @@ void initializeRegionPrinterPass(PassRegistry&);
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void initializeRegionViewerPass(PassRegistry&);
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void initializeRegisterCoalescerPass(PassRegistry&);
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void initializeRenameIndependentSubregsPass(PassRegistry&);
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void initializeResetMachineFunctionPass(PassRegistry &);
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void initializeReversePostOrderFunctionAttrsLegacyPassPass(PassRegistry&);
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void initializeRewriteStatepointsForGCPass(PassRegistry&);
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void initializeRewriteSymbolsLegacyPassPass(PassRegistry&);
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@ -105,6 +105,7 @@ add_llvm_library(LLVMCodeGen
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RegisterUsageInfo.cpp
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RegUsageInfoCollector.cpp
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RegUsageInfoPropagate.cpp
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ResetMachineFunctionPass.cpp
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SafeStack.cpp
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SafeStackColoring.cpp
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SafeStackLayout.cpp
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@ -168,6 +168,15 @@ addPassesToGenerateCode(LLVMTargetMachine *TM, PassManagerBase &PM,
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if (PassConfig->addGlobalInstructionSelect())
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return nullptr;
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// Pass to reset the MachineFunction if the ISel failed.
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PM.add(createResetMachineFunctionPass());
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// Provide a fallback path when we do not want to abort on
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// not-yet-supported input.
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if (LLVM_UNLIKELY(!PassConfig->isGlobalISelAbortEnabled()) &&
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PassConfig->addInstSelector())
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return nullptr;
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} else if (PassConfig->addInstSelector())
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return nullptr;
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53
lib/CodeGen/ResetMachineFunctionPass.cpp
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53
lib/CodeGen/ResetMachineFunctionPass.cpp
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@ -0,0 +1,53 @@
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//===-- ResetMachineFunctionPass.cpp - Machine Loop Invariant Code Motion Pass ---------===//
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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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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/Support/Debug.h"
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using namespace llvm;
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#define DEBUG_TYPE "reset-machine-function"
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namespace {
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class ResetMachineFunction : public MachineFunctionPass {
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public:
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static char ID; // Pass identification, replacement for typeid
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ResetMachineFunction() :
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MachineFunctionPass(ID) {
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}
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const char *getPassName() const override {
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return "ResetMachineFunction";
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}
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bool runOnMachineFunction(MachineFunction &MF) override {
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if (MF.getProperties().hasProperty(
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MachineFunctionProperties::Property::FailedISel)) {
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DEBUG(dbgs() << "Reseting: " << MF.getName() << '\n');
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MF.reset();
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return true;
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}
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return false;
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}
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};
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} // end anonymous namespace
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char ResetMachineFunction::ID = 0;
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INITIALIZE_PASS(ResetMachineFunction, DEBUG_TYPE,
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"reset machine function if ISel failed", false, false)
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MachineFunctionPass *
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llvm::createResetMachineFunctionPass() {
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return new ResetMachineFunction();
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}
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19
test/CodeGen/AArch64/GlobalISel/arm64-fallback.ll
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19
test/CodeGen/AArch64/GlobalISel/arm64-fallback.ll
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@ -0,0 +1,19 @@
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; RUN: not llc -O0 -global-isel -verify-machineinstrs %s -o - 2>&1 | FileCheck %s --check-prefix=ERROR
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; RUN: llc -O0 -global-isel -global-isel-abort=false -verify-machineinstrs %s -o - 2>&1 | FileCheck %s --check-prefix=FALLBACK
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; This file checks that the fallback path to selection dag works.
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; The test is fragile in the sense that it must be updated to expose
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; something that fails with global-isel.
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; When we cannot produce a test case anymore, that means we can remove
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; the fallback path.
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target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
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target triple = "aarch64-apple-ios"
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; ERROR: Unable to lower arguments
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; FALLBACK: ldr q0,
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; FALLBACK-NEXT: bl ___fixunstfti
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define i128 @ABIi128(i128 %arg1) {
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%farg1 = bitcast i128 %arg1 to fp128
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%res = fptoui fp128 %farg1 to i128
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ret i128 %res
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}
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