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c82cc9dc57
This patch introduces a new pass that computes the safe point to insert the
prologue and epilogue of the function.
The interest is to find safe points that are cheaper than the entry and exits
blocks.
As an example and to avoid regressions to be introduce, this patch also
implements the required bits to enable the shrink-wrapping pass for AArch64.
** Context **
Currently we insert the prologue and epilogue of the method/function in the
entry and exits blocks. Although this is correct, we can do a better job when
those are not immediately required and insert them at less frequently executed
places.
The job of the shrink-wrapping pass is to identify such places.
** Motivating example **
Let us consider the following function that perform a call only in one branch of
a if:
define i32 @f(i32 %a, i32 %b) {
%tmp = alloca i32, align 4
%tmp2 = icmp slt i32 %a, %b
br i1 %tmp2, label %true, label %false
true:
store i32 %a, i32* %tmp, align 4
%tmp4 = call i32 @doSomething(i32 0, i32* %tmp)
br label %false
false:
%tmp.0 = phi i32 [ %tmp4, %true ], [ %a, %0 ]
ret i32 %tmp.0
}
On AArch64 this code generates (removing the cfi directives to ease
readabilities):
_f: ; @f
; BB#0:
stp x29, x30, [sp, #-16]!
mov x29, sp
sub sp, sp, #16 ; =16
cmp w0, w1
b.ge LBB0_2
; BB#1: ; %true
stur w0, [x29, #-4]
sub x1, x29, #4 ; =4
mov w0, wzr
bl _doSomething
LBB0_2: ; %false
mov sp, x29
ldp x29, x30, [sp], #16
ret
With shrink-wrapping we could generate:
_f: ; @f
; BB#0:
cmp w0, w1
b.ge LBB0_2
; BB#1: ; %true
stp x29, x30, [sp, #-16]!
mov x29, sp
sub sp, sp, #16 ; =16
stur w0, [x29, #-4]
sub x1, x29, #4 ; =4
mov w0, wzr
bl _doSomething
add sp, x29, #16 ; =16
ldp x29, x30, [sp], #16
LBB0_2: ; %false
ret
Therefore, we would pay the overhead of setting up/destroying the frame only if
we actually do the call.
** Proposed Solution **
This patch introduces a new machine pass that perform the shrink-wrapping
analysis (See the comments at the beginning of ShrinkWrap.cpp for more details).
It then stores the safe save and restore point into the MachineFrameInfo
attached to the MachineFunction.
This information is then used by the PrologEpilogInserter (PEI) to place the
related code at the right place. This pass runs right before the PEI.
Unlike the original paper of Chow from PLDI’88, this implementation of
shrink-wrapping does not use expensive data-flow analysis and does not need hack
to properly avoid frequently executed point. Instead, it relies on dominance and
loop properties.
The pass is off by default and each target can opt-in by setting the
EnableShrinkWrap boolean to true in their derived class of TargetPassConfig.
This setting can also be overwritten on the command line by using
-enable-shrink-wrap.
Before you try out the pass for your target, make sure you properly fix your
emitProlog/emitEpilog/adjustForXXX method to cope with basic blocks that are not
necessarily the entry block.
** Design Decisions **
1. ShrinkWrap is its own pass right now. It could frankly be merged into PEI but
for debugging and clarity I thought it was best to have its own file.
2. Right now, we only support one save point and one restore point. At some
point we can expand this to several save point and restore point, the impacted
component would then be:
- The pass itself: New algorithm needed.
- MachineFrameInfo: Hold a list or set of Save/Restore point instead of one
pointer.
- PEI: Should loop over the save point and restore point.
Anyhow, at least for this first iteration, I do not believe this is interesting
to support the complex cases. We should revisit that when we motivating
examples.
Differential Revision: http://reviews.llvm.org/D9210
<rdar://problem/3201744>
llvm-svn: 236507
304 lines
14 KiB
C++
304 lines
14 KiB
C++
//===- llvm/InitializePasses.h -------- Initialize All Passes ---*- 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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//
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// This file contains the declarations for the pass initialization routines
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// for the entire LLVM project.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_INITIALIZEPASSES_H
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#define LLVM_INITIALIZEPASSES_H
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namespace llvm {
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class PassRegistry;
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/// initializeCore - Initialize all passes linked into the
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/// TransformUtils library.
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void initializeCore(PassRegistry&);
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/// initializeTransformUtils - Initialize all passes linked into the
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/// TransformUtils library.
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void initializeTransformUtils(PassRegistry&);
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/// initializeScalarOpts - Initialize all passes linked into the
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/// ScalarOpts library.
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void initializeScalarOpts(PassRegistry&);
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/// initializeObjCARCOpts - Initialize all passes linked into the ObjCARCOpts
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/// library.
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void initializeObjCARCOpts(PassRegistry&);
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/// initializeVectorization - Initialize all passes linked into the
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/// Vectorize library.
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void initializeVectorization(PassRegistry&);
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/// initializeInstCombine - Initialize all passes linked into the
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/// InstCombine library.
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void initializeInstCombine(PassRegistry&);
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/// initializeIPO - Initialize all passes linked into the IPO library.
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void initializeIPO(PassRegistry&);
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/// initializeInstrumentation - Initialize all passes linked into the
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/// Instrumentation library.
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void initializeInstrumentation(PassRegistry&);
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/// initializeAnalysis - Initialize all passes linked into the Analysis library.
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void initializeAnalysis(PassRegistry&);
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/// initializeIPA - Initialize all passes linked into the IPA library.
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void initializeIPA(PassRegistry&);
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/// initializeCodeGen - Initialize all passes linked into the CodeGen library.
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void initializeCodeGen(PassRegistry&);
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/// initializeCodeGen - Initialize all passes linked into the CodeGen library.
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void initializeTarget(PassRegistry&);
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void initializeAAEvalPass(PassRegistry&);
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void initializeAddDiscriminatorsPass(PassRegistry&);
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void initializeADCEPass(PassRegistry&);
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void initializeBDCEPass(PassRegistry&);
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void initializeAliasAnalysisAnalysisGroup(PassRegistry&);
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void initializeAliasAnalysisCounterPass(PassRegistry&);
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void initializeAliasDebuggerPass(PassRegistry&);
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void initializeAliasSetPrinterPass(PassRegistry&);
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void initializeAlwaysInlinerPass(PassRegistry&);
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void initializeArgPromotionPass(PassRegistry&);
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void initializeAtomicExpandPass(PassRegistry&);
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void initializeSampleProfileLoaderPass(PassRegistry&);
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void initializeAlignmentFromAssumptionsPass(PassRegistry&);
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void initializeBarrierNoopPass(PassRegistry&);
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void initializeBasicAliasAnalysisPass(PassRegistry&);
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void initializeCallGraphWrapperPassPass(PassRegistry &);
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void initializeBlockExtractorPassPass(PassRegistry&);
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void initializeBlockFrequencyInfoPass(PassRegistry&);
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void initializeBoundsCheckingPass(PassRegistry&);
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void initializeBranchFolderPassPass(PassRegistry&);
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void initializeBranchProbabilityInfoPass(PassRegistry&);
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void initializeBreakCriticalEdgesPass(PassRegistry&);
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void initializeCallGraphPrinterPass(PassRegistry&);
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void initializeCallGraphViewerPass(PassRegistry&);
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void initializeCFGOnlyPrinterPass(PassRegistry&);
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void initializeCFGOnlyViewerPass(PassRegistry&);
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void initializeCFGPrinterPass(PassRegistry&);
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void initializeCFGSimplifyPassPass(PassRegistry&);
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void initializeCFLAliasAnalysisPass(PassRegistry&);
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void initializeForwardControlFlowIntegrityPass(PassRegistry&);
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void initializeFlattenCFGPassPass(PassRegistry&);
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void initializeStructurizeCFGPass(PassRegistry&);
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void initializeCFGViewerPass(PassRegistry&);
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void initializeConstantHoistingPass(PassRegistry&);
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void initializeCodeGenPreparePass(PassRegistry&);
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void initializeConstantMergePass(PassRegistry&);
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void initializeConstantPropagationPass(PassRegistry&);
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void initializeMachineCopyPropagationPass(PassRegistry&);
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void initializeCostModelAnalysisPass(PassRegistry&);
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void initializeCorrelatedValuePropagationPass(PassRegistry&);
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void initializeDAEPass(PassRegistry&);
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void initializeDAHPass(PassRegistry&);
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void initializeDCEPass(PassRegistry&);
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void initializeDSEPass(PassRegistry&);
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void initializeDeadInstEliminationPass(PassRegistry&);
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void initializeDeadMachineInstructionElimPass(PassRegistry&);
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void initializeDelinearizationPass(PassRegistry &);
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void initializeDependenceAnalysisPass(PassRegistry&);
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void initializeDivergenceAnalysisPass(PassRegistry&);
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void initializeDomOnlyPrinterPass(PassRegistry&);
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void initializeDomOnlyViewerPass(PassRegistry&);
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void initializeDomPrinterPass(PassRegistry&);
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void initializeDomViewerPass(PassRegistry&);
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void initializeDominanceFrontierPass(PassRegistry&);
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void initializeDominatorTreeWrapperPassPass(PassRegistry&);
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void initializeEarlyIfConverterPass(PassRegistry&);
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void initializeEdgeBundlesPass(PassRegistry&);
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void initializeExpandPostRAPass(PassRegistry&);
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void initializeGCOVProfilerPass(PassRegistry&);
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void initializeInstrProfilingPass(PassRegistry&);
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void initializeAddressSanitizerPass(PassRegistry&);
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void initializeAddressSanitizerModulePass(PassRegistry&);
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void initializeMemorySanitizerPass(PassRegistry&);
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void initializeThreadSanitizerPass(PassRegistry&);
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void initializeSanitizerCoverageModulePass(PassRegistry&);
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void initializeDataFlowSanitizerPass(PassRegistry&);
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void initializeScalarizerPass(PassRegistry&);
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void initializeEarlyCSELegacyPassPass(PassRegistry &);
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void initializeExpandISelPseudosPass(PassRegistry&);
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void initializeFunctionAttrsPass(PassRegistry&);
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void initializeGCMachineCodeAnalysisPass(PassRegistry&);
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void initializeGCModuleInfoPass(PassRegistry&);
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void initializeGVNPass(PassRegistry&);
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void initializeGlobalDCEPass(PassRegistry&);
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void initializeGlobalOptPass(PassRegistry&);
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void initializeGlobalsModRefPass(PassRegistry&);
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void initializeIPCPPass(PassRegistry&);
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void initializeIPSCCPPass(PassRegistry&);
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void initializeIVUsersPass(PassRegistry&);
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void initializeIfConverterPass(PassRegistry&);
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void initializeInductiveRangeCheckEliminationPass(PassRegistry&);
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void initializeIndVarSimplifyPass(PassRegistry&);
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void initializeInlineCostAnalysisPass(PassRegistry&);
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void initializeInstructionCombiningPassPass(PassRegistry&);
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void initializeInstCountPass(PassRegistry&);
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void initializeInstNamerPass(PassRegistry&);
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void initializeInternalizePassPass(PassRegistry&);
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void initializeIntervalPartitionPass(PassRegistry&);
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void initializeJumpThreadingPass(PassRegistry&);
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void initializeLCSSAPass(PassRegistry&);
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void initializeLICMPass(PassRegistry&);
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void initializeLazyValueInfoPass(PassRegistry&);
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void initializeLibCallAliasAnalysisPass(PassRegistry&);
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void initializeLintPass(PassRegistry&);
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void initializeLiveDebugVariablesPass(PassRegistry&);
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void initializeLiveIntervalsPass(PassRegistry&);
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void initializeLiveRegMatrixPass(PassRegistry&);
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void initializeLiveStacksPass(PassRegistry&);
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void initializeLiveVariablesPass(PassRegistry&);
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void initializeLoaderPassPass(PassRegistry&);
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void initializeLocalStackSlotPassPass(PassRegistry&);
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void initializeLoopDeletionPass(PassRegistry&);
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void initializeLoopExtractorPass(PassRegistry&);
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void initializeLoopInfoWrapperPassPass(PassRegistry&);
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void initializeLoopInterchangePass(PassRegistry &);
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void initializeLoopInstSimplifyPass(PassRegistry&);
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void initializeLoopRotatePass(PassRegistry&);
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void initializeLoopSimplifyPass(PassRegistry&);
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void initializeLoopStrengthReducePass(PassRegistry&);
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void initializeGlobalMergePass(PassRegistry&);
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void initializeLoopRerollPass(PassRegistry&);
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void initializeLoopUnrollPass(PassRegistry&);
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void initializeLoopUnswitchPass(PassRegistry&);
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void initializeLoopIdiomRecognizePass(PassRegistry&);
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void initializeLowerAtomicPass(PassRegistry&);
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void initializeLowerBitSetsPass(PassRegistry&);
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void initializeLowerExpectIntrinsicPass(PassRegistry&);
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void initializeLowerIntrinsicsPass(PassRegistry&);
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void initializeLowerInvokePass(PassRegistry&);
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void initializeLowerSwitchPass(PassRegistry&);
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void initializeMachineBlockFrequencyInfoPass(PassRegistry&);
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void initializeMachineBlockPlacementPass(PassRegistry&);
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void initializeMachineBlockPlacementStatsPass(PassRegistry&);
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void initializeMachineBranchProbabilityInfoPass(PassRegistry&);
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void initializeMachineCSEPass(PassRegistry&);
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void initializeMachineDominatorTreePass(PassRegistry&);
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void initializeMachineDominanceFrontierPass(PassRegistry&);
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void initializeMachinePostDominatorTreePass(PassRegistry&);
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void initializeMachineLICMPass(PassRegistry&);
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void initializeMachineLoopInfoPass(PassRegistry&);
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void initializeMachineModuleInfoPass(PassRegistry&);
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void initializeMachineRegionInfoPassPass(PassRegistry&);
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void initializeMachineSchedulerPass(PassRegistry&);
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void initializeMachineSinkingPass(PassRegistry&);
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void initializeMachineTraceMetricsPass(PassRegistry&);
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void initializeMachineVerifierPassPass(PassRegistry&);
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void initializeMemCpyOptPass(PassRegistry&);
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void initializeMemDepPrinterPass(PassRegistry&);
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void initializeMemDerefPrinterPass(PassRegistry&);
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void initializeMemoryDependenceAnalysisPass(PassRegistry&);
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void initializeMergedLoadStoreMotionPass(PassRegistry &);
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void initializeMetaRenamerPass(PassRegistry&);
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void initializeMergeFunctionsPass(PassRegistry&);
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void initializeModuleDebugInfoPrinterPass(PassRegistry&);
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void initializeNaryReassociatePass(PassRegistry&);
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void initializeNoAAPass(PassRegistry&);
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void initializeObjCARCAliasAnalysisPass(PassRegistry&);
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void initializeObjCARCAPElimPass(PassRegistry&);
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void initializeObjCARCExpandPass(PassRegistry&);
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void initializeObjCARCContractPass(PassRegistry&);
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void initializeObjCARCOptPass(PassRegistry&);
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void initializePAEvalPass(PassRegistry &);
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void initializeOptimizePHIsPass(PassRegistry&);
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void initializePartiallyInlineLibCallsPass(PassRegistry&);
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void initializePEIPass(PassRegistry&);
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void initializePHIEliminationPass(PassRegistry&);
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void initializePartialInlinerPass(PassRegistry&);
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void initializePeepholeOptimizerPass(PassRegistry&);
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void initializePostDomOnlyPrinterPass(PassRegistry&);
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void initializePostDomOnlyViewerPass(PassRegistry&);
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void initializePostDomPrinterPass(PassRegistry&);
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void initializePostDomViewerPass(PassRegistry&);
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void initializePostDominatorTreePass(PassRegistry&);
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void initializePostRASchedulerPass(PassRegistry&);
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void initializePostMachineSchedulerPass(PassRegistry&);
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void initializePrintFunctionPassWrapperPass(PassRegistry&);
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void initializePrintModulePassWrapperPass(PassRegistry&);
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void initializePrintBasicBlockPassPass(PassRegistry&);
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void initializeProcessImplicitDefsPass(PassRegistry&);
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void initializePromotePassPass(PassRegistry&);
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void initializePruneEHPass(PassRegistry&);
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void initializeReassociatePass(PassRegistry&);
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void initializeRegToMemPass(PassRegistry&);
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void initializeRegionInfoPassPass(PassRegistry&);
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void initializeRegionOnlyPrinterPass(PassRegistry&);
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void initializeRegionOnlyViewerPass(PassRegistry&);
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void initializeRegionPrinterPass(PassRegistry&);
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void initializeRegionViewerPass(PassRegistry&);
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void initializeRewriteStatepointsForGCPass(PassRegistry&);
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void initializeSCCPPass(PassRegistry&);
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void initializeSROAPass(PassRegistry&);
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void initializeSROA_DTPass(PassRegistry&);
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void initializeSROA_SSAUpPass(PassRegistry&);
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void initializeScalarEvolutionAliasAnalysisPass(PassRegistry&);
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void initializeScalarEvolutionPass(PassRegistry&);
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void initializeShrinkWrapPass(PassRegistry &);
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void initializeSimpleInlinerPass(PassRegistry&);
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void initializeShadowStackGCLoweringPass(PassRegistry&);
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void initializeRegisterCoalescerPass(PassRegistry&);
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void initializeSingleLoopExtractorPass(PassRegistry&);
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void initializeSinkingPass(PassRegistry&);
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void initializeSeparateConstOffsetFromGEPPass(PassRegistry &);
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void initializeSlotIndexesPass(PassRegistry&);
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void initializeSpillPlacementPass(PassRegistry&);
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void initializeStackProtectorPass(PassRegistry&);
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void initializeStackColoringPass(PassRegistry&);
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void initializeStackSlotColoringPass(PassRegistry&);
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void initializeStraightLineStrengthReducePass(PassRegistry &);
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void initializeStripDeadDebugInfoPass(PassRegistry&);
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void initializeStripDeadPrototypesPassPass(PassRegistry&);
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void initializeStripDebugDeclarePass(PassRegistry&);
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void initializeStripNonDebugSymbolsPass(PassRegistry&);
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void initializeStripSymbolsPass(PassRegistry&);
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void initializeTailCallElimPass(PassRegistry&);
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void initializeTailDuplicatePassPass(PassRegistry&);
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void initializeTargetPassConfigPass(PassRegistry&);
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void initializeDataLayoutPassPass(PassRegistry &);
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void initializeTargetTransformInfoWrapperPassPass(PassRegistry &);
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void initializeTargetLibraryInfoWrapperPassPass(PassRegistry &);
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void initializeAssumptionCacheTrackerPass(PassRegistry &);
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void initializeTwoAddressInstructionPassPass(PassRegistry&);
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void initializeTypeBasedAliasAnalysisPass(PassRegistry&);
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void initializeScopedNoAliasAAPass(PassRegistry&);
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void initializeUnifyFunctionExitNodesPass(PassRegistry&);
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void initializeUnreachableBlockElimPass(PassRegistry&);
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void initializeUnreachableMachineBlockElimPass(PassRegistry&);
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void initializeVerifierLegacyPassPass(PassRegistry&);
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void initializeVirtRegMapPass(PassRegistry&);
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void initializeVirtRegRewriterPass(PassRegistry&);
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void initializeInstSimplifierPass(PassRegistry&);
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void initializeUnpackMachineBundlesPass(PassRegistry&);
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void initializeFinalizeMachineBundlesPass(PassRegistry&);
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void initializeLoopAccessAnalysisPass(PassRegistry&);
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void initializeLoopVectorizePass(PassRegistry&);
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void initializeSLPVectorizerPass(PassRegistry&);
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void initializeBBVectorizePass(PassRegistry&);
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void initializeMachineFunctionPrinterPassPass(PassRegistry&);
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void initializeStackMapLivenessPass(PassRegistry&);
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void initializeMachineCombinerPass(PassRegistry &);
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void initializeLoadCombinePass(PassRegistry&);
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void initializeRewriteSymbolsPass(PassRegistry&);
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void initializeWinEHPreparePass(PassRegistry&);
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void initializePlaceBackedgeSafepointsImplPass(PassRegistry&);
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void initializePlaceSafepointsPass(PassRegistry&);
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void initializeDwarfEHPreparePass(PassRegistry&);
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void initializeFloat2IntPass(PassRegistry&);
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}
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#endif
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