mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 20:23:11 +01:00
7fbb587058
As a follow-up to https://reviews.llvm.org/D104129, I'm cleaning up the danling probe related code in both the compiler and llvm-profgen. I'm seeing a 5% size win for the pseudo_probe section for SPEC2017 and 10% for Ciner. Certain benchmark such as 602.gcc has a 20% size win. No obvious difference seen on build time for SPEC2017 and Cinder. Reviewed By: wenlei Differential Revision: https://reviews.llvm.org/D104477
110 lines
4.1 KiB
C++
110 lines
4.1 KiB
C++
//===- PseudoProbe.cpp - Pseudo Probe Helpers -----------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements the helpers to manipulate pseudo probe IR intrinsic
|
|
// calls.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/IR/PseudoProbe.h"
|
|
#include "llvm/IR/DebugInfoMetadata.h"
|
|
#include "llvm/IR/IRBuilder.h"
|
|
#include "llvm/IR/Instruction.h"
|
|
#include <unordered_set>
|
|
|
|
using namespace llvm;
|
|
|
|
namespace llvm {
|
|
|
|
Optional<PseudoProbe> extractProbeFromDiscriminator(const Instruction &Inst) {
|
|
assert(isa<CallBase>(&Inst) && !isa<IntrinsicInst>(&Inst) &&
|
|
"Only call instructions should have pseudo probe encodes as their "
|
|
"Dwarf discriminators");
|
|
if (const DebugLoc &DLoc = Inst.getDebugLoc()) {
|
|
const DILocation *DIL = DLoc;
|
|
auto Discriminator = DIL->getDiscriminator();
|
|
if (DILocation::isPseudoProbeDiscriminator(Discriminator)) {
|
|
PseudoProbe Probe;
|
|
Probe.Id =
|
|
PseudoProbeDwarfDiscriminator::extractProbeIndex(Discriminator);
|
|
Probe.Type =
|
|
PseudoProbeDwarfDiscriminator::extractProbeType(Discriminator);
|
|
Probe.Attr =
|
|
PseudoProbeDwarfDiscriminator::extractProbeAttributes(Discriminator);
|
|
Probe.Factor =
|
|
PseudoProbeDwarfDiscriminator::extractProbeFactor(Discriminator) /
|
|
(float)PseudoProbeDwarfDiscriminator::FullDistributionFactor;
|
|
return Probe;
|
|
}
|
|
}
|
|
return None;
|
|
}
|
|
|
|
Optional<PseudoProbe> extractProbe(const Instruction &Inst) {
|
|
if (const auto *II = dyn_cast<PseudoProbeInst>(&Inst)) {
|
|
PseudoProbe Probe;
|
|
Probe.Id = II->getIndex()->getZExtValue();
|
|
Probe.Type = (uint32_t)PseudoProbeType::Block;
|
|
Probe.Attr = II->getAttributes()->getZExtValue();
|
|
Probe.Factor = II->getFactor()->getZExtValue() /
|
|
(float)PseudoProbeFullDistributionFactor;
|
|
return Probe;
|
|
}
|
|
|
|
if (isa<CallBase>(&Inst) && !isa<IntrinsicInst>(&Inst))
|
|
return extractProbeFromDiscriminator(Inst);
|
|
|
|
return None;
|
|
}
|
|
|
|
void setProbeDistributionFactor(Instruction &Inst, float Factor) {
|
|
assert(Factor >= 0 && Factor <= 1 &&
|
|
"Distribution factor must be in [0, 1.0]");
|
|
if (auto *II = dyn_cast<PseudoProbeInst>(&Inst)) {
|
|
IRBuilder<> Builder(&Inst);
|
|
uint64_t IntFactor = PseudoProbeFullDistributionFactor;
|
|
if (Factor < 1)
|
|
IntFactor *= Factor;
|
|
auto OrigFactor = II->getFactor()->getZExtValue();
|
|
if (IntFactor != OrigFactor)
|
|
II->replaceUsesOfWith(II->getFactor(), Builder.getInt64(IntFactor));
|
|
} else if (isa<CallBase>(&Inst) && !isa<IntrinsicInst>(&Inst)) {
|
|
if (const DebugLoc &DLoc = Inst.getDebugLoc()) {
|
|
const DILocation *DIL = DLoc;
|
|
auto Discriminator = DIL->getDiscriminator();
|
|
if (DILocation::isPseudoProbeDiscriminator(Discriminator)) {
|
|
auto Index =
|
|
PseudoProbeDwarfDiscriminator::extractProbeIndex(Discriminator);
|
|
auto Type =
|
|
PseudoProbeDwarfDiscriminator::extractProbeType(Discriminator);
|
|
auto Attr = PseudoProbeDwarfDiscriminator::extractProbeAttributes(
|
|
Discriminator);
|
|
// Round small factors to 0 to avoid over-counting.
|
|
uint32_t IntFactor =
|
|
PseudoProbeDwarfDiscriminator::FullDistributionFactor;
|
|
if (Factor < 1)
|
|
IntFactor *= Factor;
|
|
uint32_t V = PseudoProbeDwarfDiscriminator::packProbeData(
|
|
Index, Type, Attr, IntFactor);
|
|
DIL = DIL->cloneWithDiscriminator(V);
|
|
Inst.setDebugLoc(DIL);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void addPseudoProbeAttribute(PseudoProbeInst &Inst,
|
|
PseudoProbeAttributes Attr) {
|
|
IRBuilder<> Builder(&Inst);
|
|
uint32_t OldAttr = Inst.getAttributes()->getZExtValue();
|
|
uint32_t NewAttr = OldAttr | (uint32_t)Attr;
|
|
if (OldAttr != NewAttr)
|
|
Inst.replaceUsesOfWith(Inst.getAttributes(), Builder.getInt32(NewAttr));
|
|
}
|
|
} // namespace llvm
|