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[GISel][NFC]: Add missing call to record CSE hits in the CSEMIRBuilder

Browse Source 
https://reviews.llvm.org/D57932

Add some logging + tests to make sure CSEInfo prints debug output.

reviewed by: arsenm

llvm-svn: 353553
This commit is contained in:
Aditya Nandakumar 2019-02-08 19:41:13 +00:00
parent 49e5279126
commit 1cbeacb1ea
3 changed files with 45 additions and 9 deletions
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18
lib/CodeGen/GlobalISel/CSEInfo.cpp
View File

@ -138,7 +138,7 @@ MachineInstr *GISelCSEInfo::getMachineInstrIfExists(FoldingSetNodeID &ID,
void *&InsertPos) {
handleRecordedInsts();
if (auto *Inst = getNodeIfExists(ID, MBB, InsertPos)) {
LLVM_DEBUG(dbgs() << "CSEInfo: Found Instr " << *Inst->MI << "\n";);
LLVM_DEBUG(dbgs() << "CSEInfo::Found Instr " << *Inst->MI;);
return const_cast<MachineInstr *>(Inst->MI);
}
return nullptr;
@ -157,14 +157,14 @@ void GISelCSEInfo::countOpcodeHit(unsigned Opc) {
void GISelCSEInfo::recordNewInstruction(MachineInstr *MI) {
if (shouldCSE(MI->getOpcode())) {
TemporaryInsts.insert(MI);
LLVM_DEBUG(dbgs() << "CSEInfo: Recording new MI " << *MI);
LLVM_DEBUG(dbgs() << "CSEInfo::Recording new MI " << *MI);
}
}
void GISelCSEInfo::handleRecordedInst(MachineInstr *MI) {
assert(shouldCSE(MI->getOpcode()) && "Invalid instruction for CSE");
auto *UMI = InstrMapping.lookup(MI);
LLVM_DEBUG(dbgs() << "CSEInfo: Handling recorded MI " << *MI);
LLVM_DEBUG(dbgs() << "CSEInfo::Handling recorded MI " << *MI);
if (UMI) {
// Invalidate this MI.
invalidateUniqueMachineInstr(UMI);
@ -230,7 +230,7 @@ void GISelCSEInfo::analyze(MachineFunction &MF) {
}
void GISelCSEInfo::releaseMemory() {
// print();
print();
CSEMap.clear();
InstrMapping.clear();
UniqueInstrAllocator.Reset();
@ -244,11 +244,11 @@ void GISelCSEInfo::releaseMemory() {
}
void GISelCSEInfo::print() {
#ifndef NDEBUG
for (auto &It : OpcodeHitTable) {
dbgs() << "CSE Count for Opc " << It.first << " : " << It.second << "\n";
};
#endif
LLVM_DEBUG(for (auto &It
: OpcodeHitTable) {
dbgs() << "CSEInfo::CSE Hit for Opc " << It.first << " : " << It.second
<< "\n";
};);
}
/// -----------------------------------------
// ---- Profiling methods for FoldingSetNode --- //

1
lib/CodeGen/GlobalISel/CSEMIRBuilder.cpp
View File

@ -39,6 +39,7 @@ CSEMIRBuilder::getDominatingInstrForID(FoldingSetNodeID &ID,
MachineInstr *MI =
CSEInfo->getMachineInstrIfExists(ID, CurMBB, NodeInsertPos);
if (MI) {
CSEInfo->countOpcodeHit(MI->getOpcode());
auto CurrPos = getInsertPt();
if (!dominates(MI, CurrPos))
CurMBB->splice(CurrPos, CurMBB, MI);

35
test/CodeGen/AArch64/GlobalISel/legalize-ext-csedebug-output.mir Normal file
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@ -0,0 +1,35 @@
# RUN: llc -march=aarch64 -run-pass=legalizer %s -o - -enable-cse-in-legalizer=1 -debug-only=cseinfo 2>&1 | FileCheck %s
# Test the -debug-only=cseinfo option here to make sure we're recording new instructions and printing the hit count
# at the end.
# REQUIRES: asserts
---
name: test_cse_in_legalizer
body: |
bb.0.entry:
; CHECK: CSEInfo::Add MI: %{{[0-9]+}}:_(s8) = G_TRUNC
; CHECK: CSEInfo::Add MI: %{{[0-9]+}}:_(s32) = G_ZEXT
; CHECK: CSEInfo::Add MI: %{{[0-9]+}}:_(s8) = G_TRUNC
; CHECK: CSEInfo::Add MI: %{{[0-9]+}}:_(s32) = G_ZEXT
; CHECK: CSEInfo::Recording new MI G_CONSTANT
; CHECK: CSEInfo::Recording new MI G_CONSTANT
; CHECK: CSEInfo::Recording new MI G_TRUNC
; CHECK: CSEInfo::Recording new MI G_TRUNC
; CHECK: CSEInfo::Recording new MI G_AND
; CHECK: CSEInfo::Recording new MI G_AND
; CHECK: CSEInfo::Found Instr %{{[0-9]+}}:_(s32) = G_CONSTANT
; CHECK: CSEInfo::Found Instr %{{[0-9]+}}:_(s32) = G_TRUNC
; CHECK: CSEInfo::Found Instr %{{[0-9]+}}:_(s32) = G_AND
; Note - these will be sensitive the opcode numbers. If
; frequently modifying generic opcodes, we could just regex
; the opcodes in the following lines instead of checking for
; specific opcode numbers.
; CHECK: CSEInfo::CSE Hit for Opc 82 : 1
; CHECK: CSEInfo::CSE Hit for Opc 41 : 1
; CHECK: CSEInfo::CSE Hit for Opc 83 : 1
%0:_(s64) = COPY $x0
%1:_(s8) = G_TRUNC %0(s64)
%19:_(s32) = G_ZEXT %1(s8)
$w0 = COPY %19(s32)
%2:_(s8) = G_TRUNC %0(s64)
%20:_(s32) = G_ZEXT %2(s8)
$w0 = COPY %20(s32)