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OptDiag: Summarize the instruction count in asm-printer

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Add an optimization remark to asm-printer that summarizes the number
of instructions emitted per function.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296053 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Justin Bogner 2017-02-24 00:19:22 +00:00
parent 04ea7c64e2
commit 52ab9f0e65
2 changed files with 17 additions and 1 deletions
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4
include/llvm/CodeGen/AsmPrinter.h
View File

@ -53,6 +53,7 @@ class MachineInstr;
class MachineJumpTableInfo;
class MachineLoopInfo;
class MachineModuleInfo;
class MachineOptimizationRemarkEmitter;
class MCAsmInfo;
class MCCFIInstruction;
class MCContext;
@ -93,6 +94,9 @@ public:
/// This is a pointer to the current MachineModuleInfo.
MachineModuleInfo *MMI = nullptr;
/// Optimization remark emitter.
MachineOptimizationRemarkEmitter *ORE;
/// The symbol for the current function. This is recalculated at the beginning
/// of each call to runOnMachineFunction().
///

14
lib/CodeGen/AsmPrinter/AsmPrinter.cpp
View File

@ -45,6 +45,7 @@
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/MachineModuleInfoImpls.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/MachineOptimizationRemarkEmitter.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Constant.h"
#include "llvm/IR/Constants.h"
@ -213,6 +214,7 @@ void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
MachineFunctionPass::getAnalysisUsage(AU);
AU.addRequired<MachineModuleInfo>();
AU.addRequired<MachineOptimizationRemarkEmitterPass>();
AU.addRequired<GCModuleInfo>();
if (isVerbose())
AU.addRequired<MachineLoopInfo>();
@ -925,6 +927,7 @@ void AsmPrinter::EmitFunctionBody() {
// Print out code for the function.
bool HasAnyRealCode = false;
int NumInstsInFunction = 0;
for (auto &MBB : *MF) {
// Print a label for the basic block.
EmitBasicBlockStart(MBB);
@ -934,7 +937,7 @@ void AsmPrinter::EmitFunctionBody() {
if (!MI.isPosition() && !MI.isImplicitDef() && !MI.isKill() &&
!MI.isDebugValue()) {
HasAnyRealCode = true;
++EmittedInsts;
++NumInstsInFunction;
}
if (ShouldPrintDebugScopes) {
@ -995,6 +998,14 @@ void AsmPrinter::EmitFunctionBody() {
EmitBasicBlockEnd(MBB);
}
EmittedInsts += NumInstsInFunction;
MachineOptimizationRemarkAnalysis R(DEBUG_TYPE, "InstructionCount",
MF->getFunction()->getSubprogram(),
&MF->front());
R << ore::NV("NumInstructions", NumInstsInFunction)
<< " instructions in function";
ORE->emit(R);
// If the function is empty and the object file uses .subsections_via_symbols,
// then we need to emit *something* to the function body to prevent the
// labels from collapsing together. Just emit a noop.
@ -1353,6 +1364,7 @@ void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
CurrentFnSymForSize = CurrentFnBegin;
}
ORE = &getAnalysis<MachineOptimizationRemarkEmitterPass>().getORE();
if (isVerbose())
LI = &getAnalysis<MachineLoopInfo>();
}