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[PEI] Add basic opt-remarks support
Add optimization remarks support to the PrologueEpilogueInserter. For now, emit the stack size as an analysis remark, but more additions wrt shrink-wrapping may be added. https://reviews.llvm.org/D35645 llvm-svn: 308556
This commit is contained in:
Francis Visoiu Mistrih
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8c2df64728
commit
497c89212c
@ -25,6 +25,7 @@
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/CodeGen/MachineLoopInfo.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/CodeGen/MachineOptimizationRemarkEmitter.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/CodeGen/RegisterScavenging.h"
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@ -98,6 +99,9 @@ private:
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// FrameIndexVirtualScavenging is used.
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bool FrameIndexEliminationScavenging;
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// Emit remarks.
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MachineOptimizationRemarkEmitter *ORE = nullptr;
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void calculateCallFrameInfo(MachineFunction &Fn);
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void calculateSaveRestoreBlocks(MachineFunction &Fn);
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void doSpillCalleeSavedRegs(MachineFunction &MF);
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@ -122,6 +126,7 @@ INITIALIZE_PASS_BEGIN(PEI, DEBUG_TYPE, "Prologue/Epilogue Insertion", false,
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INITIALIZE_PASS_DEPENDENCY(MachineLoopInfo)
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INITIALIZE_PASS_DEPENDENCY(MachineDominatorTree)
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INITIALIZE_PASS_DEPENDENCY(StackProtector)
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INITIALIZE_PASS_DEPENDENCY(MachineOptimizationRemarkEmitterPass)
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INITIALIZE_PASS_END(PEI, DEBUG_TYPE,
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"Prologue/Epilogue Insertion & Frame Finalization", false,
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false)
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@ -138,6 +143,7 @@ void PEI::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addPreserved<MachineLoopInfo>();
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AU.addPreserved<MachineDominatorTree>();
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AU.addRequired<StackProtector>();
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AU.addRequired<MachineOptimizationRemarkEmitterPass>();
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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@ -171,6 +177,7 @@ bool PEI::runOnMachineFunction(MachineFunction &Fn) {
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FrameIndexVirtualScavenging = TRI->requiresFrameIndexScavenging(Fn);
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FrameIndexEliminationScavenging = (RS && !FrameIndexVirtualScavenging) ||
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TRI->requiresFrameIndexReplacementScavenging(Fn);
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ORE = &getAnalysis<MachineOptimizationRemarkEmitterPass>().getORE();
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// Calculate the MaxCallFrameSize and AdjustsStack variables for the
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// function's frame information. Also eliminates call frame pseudo
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@ -938,6 +945,12 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
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int64_t StackSize = Offset - LocalAreaOffset;
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MFI.setStackSize(StackSize);
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NumBytesStackSpace += StackSize;
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MachineOptimizationRemarkAnalysis R(
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DEBUG_TYPE, "StackSize", Fn.getFunction()->getSubprogram(), &Fn.front());
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R << ore::NV("NumStackBytes", static_cast<unsigned>(StackSize))
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<< " stack bytes in function";
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ORE->emit(R);
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}
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/// insertPrologEpilogCode - Scan the function for modified callee saved
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57
test/CodeGen/AArch64/prologue-epilogue-remarks.mir
Normal file
57
test/CodeGen/AArch64/prologue-epilogue-remarks.mir
Normal file
@ -0,0 +1,57 @@
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# RUN: llc -mtriple=aarch64-unknown-unknown -run-pass=prologepilog -pass-remarks-output=%t -pass-remarks-analysis=prologepilog -o /dev/null %s 2>&1
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# RUN: cat %t | FileCheck %s
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...
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---
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name: fun0
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stack:
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- { id: 0, type: default, offset: 0, size: 8, alignment: 4 }
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# CHECK: --- !Analysis
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# CHECK-NEXT: Pass: prologepilog
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# CHECK-NEXT: Name: StackSize
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# CHECK-NEXT: Function: fun0
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# CHECK-NEXT: Args:
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# CHECK-NEXT: - NumStackBytes: '16'
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# CHECK-NEXT: - String: ' stack bytes in function'
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# CHECK-NEXT: ...
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constants:
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body: |
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bb.0:
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RET_ReallyLR
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...
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---
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name: fun1
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stack:
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- { id: 0, type: default, offset: 0, size: 19, alignment: 4 }
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# CHECK: --- !Analysis
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# CHECK-NEXT: Pass: prologepilog
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# CHECK-NEXT: Name: StackSize
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# CHECK-NEXT: Function: fun1
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# CHECK-NEXT: Args:
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# CHECK-NEXT: - NumStackBytes: '32'
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# CHECK-NEXT: - String: ' stack bytes in function'
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# CHECK-NEXT: ...
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constants:
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body: |
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bb.0:
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RET_ReallyLR
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...
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---
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name: fun2
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stack:
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- { id: 0, type: default, offset: 0, size: 1024, alignment: 4 }
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# --- !Analysis
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# CHECK: Pass: prologepilog
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# CHECK-NEXT: Name: StackSize
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# CHECK-NEXT: Function: fun2
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# CHECK-NEXT: Args:
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# CHECK-NEXT: - NumStackBytes: '1040'
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# CHECK-NEXT: - String: ' stack bytes in function'
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# CHECK-NEXT: ...
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constants:
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body: |
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bb.0:
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RET_ReallyLR
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...
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@ -42,6 +42,8 @@
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; CHECK-NEXT: Fast Register Allocator
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; CHECK-NEXT: Bundle Machine CFG Edges
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; CHECK-NEXT: X86 FP Stackifier
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; CHECK-NEXT: Lazy Machine Block Frequency Analysis
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; CHECK-NEXT: Machine Optimization Remark Emitter
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; CHECK-NEXT: Prologue/Epilogue Insertion & Frame Finalization
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; CHECK-NEXT: Post-RA pseudo instruction expansion pass
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; CHECK-NEXT: X86 pseudo instruction expansion pass
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58
test/CodeGen/X86/prologue-epilogue-remarks.mir
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58
test/CodeGen/X86/prologue-epilogue-remarks.mir
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@ -0,0 +1,58 @@
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# RUN: llc -mtriple=x86_64-unknown-unknown -run-pass=prologepilog -pass-remarks-output=%t -pass-remarks-analysis=prologepilog -o /dev/null %s 2>&1
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# RUN: cat %t | FileCheck %s
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...
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---
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name: fun0
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stack:
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- { id: 0, type: default, offset: 0, size: 8, alignment: 4 }
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# --- !Analysis
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# CHECK: Pass: prologepilog
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# CHECK-NEXT: Name: StackSize
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# CHECK-NEXT: Function: fun0
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# CHECK-NEXT: Args:
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# CHECK-NEXT: - NumStackBytes: '8'
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# CHECK-NEXT: - String: ' stack bytes in function'
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# CHECK-NEXT: ...
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constants:
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body: |
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bb.0:
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RETQ
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...
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---
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name: fun1
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stack:
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- { id: 0, type: default, offset: 0, size: 19, alignment: 4 }
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# --- !Analysis
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# CHECK: Pass: prologepilog
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# CHECK-NEXT: Name: StackSize
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# CHECK-NEXT: Function: fun1
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# CHECK-NEXT: Args:
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# CHECK-NEXT: - NumStackBytes: '20'
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# CHECK-NEXT: - String: ' stack bytes in function'
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# CHECK-NEXT: ...
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constants:
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body: |
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bb.0:
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RETQ
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...
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---
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name: fun2
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stack:
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- { id: 0, type: default, offset: 0, size: 1024, alignment: 8 }
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# --- !Analysis
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# CHECK: Pass: prologepilog
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# CHECK-NEXT: Name: StackSize
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# CHECK-NEXT: Function: fun2
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# CHECK-NEXT: Args:
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# CHECK-NEXT: - NumStackBytes: '1024'
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# CHECK-NEXT: - String: ' stack bytes in function'
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# CHECK-NEXT: ...
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constants:
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body: |
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bb.0:
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RETQ
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...
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