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llvm-mirror/lib/Target/AMDGPU/SIFixSGPRCopies.cpp
Chandler Carruth eb66b33867 Sort the remaining #include lines in include/... and lib/.... 
I did this a long time ago with a janky python script, but now
clang-format has built-in support for this. I fed clang-format every
line with a #include and let it re-sort things according to the precise
LLVM rules for include ordering baked into clang-format these days.

I've reverted a number of files where the results of sorting includes
isn't healthy. Either places where we have legacy code relying on
particular include ordering (where possible, I'll fix these separately)
or where we have particular formatting around #include lines that
I didn't want to disturb in this patch.

This patch is *entirely* mechanical. If you get merge conflicts or
anything, just ignore the changes in this patch and run clang-format
over your #include lines in the files.

Sorry for any noise here, but it is important to keep these things
stable. I was seeing an increasing number of patches with irrelevant
re-ordering of #include lines because clang-format was used. This patch
at least isolates that churn, makes it easy to skip when resolving
conflicts, and gets us to a clean baseline (again).

llvm-svn: 304787
2017-06-06 11:49:48 +00:00

662 lines
21 KiB
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//===-- SIFixSGPRCopies.cpp - Remove potential VGPR => SGPR copies --------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
/// \file
/// Copies from VGPR to SGPR registers are illegal and the register coalescer
/// will sometimes generate these illegal copies in situations like this:
///
/// Register Class <vsrc> is the union of <vgpr> and <sgpr>
///
/// BB0:
/// %vreg0 <sgpr> = SCALAR_INST
/// %vreg1 <vsrc> = COPY %vreg0 <sgpr>
/// ...
/// BRANCH %cond BB1, BB2
/// BB1:
/// %vreg2 <vgpr> = VECTOR_INST
/// %vreg3 <vsrc> = COPY %vreg2 <vgpr>
/// BB2:
/// %vreg4 <vsrc> = PHI %vreg1 <vsrc>, <BB#0>, %vreg3 <vrsc>, <BB#1>
/// %vreg5 <vgpr> = VECTOR_INST %vreg4 <vsrc>
///
///
/// The coalescer will begin at BB0 and eliminate its copy, then the resulting
/// code will look like this:
///
/// BB0:
/// %vreg0 <sgpr> = SCALAR_INST
/// ...
/// BRANCH %cond BB1, BB2
/// BB1:
/// %vreg2 <vgpr> = VECTOR_INST
/// %vreg3 <vsrc> = COPY %vreg2 <vgpr>
/// BB2:
/// %vreg4 <sgpr> = PHI %vreg0 <sgpr>, <BB#0>, %vreg3 <vsrc>, <BB#1>
/// %vreg5 <vgpr> = VECTOR_INST %vreg4 <sgpr>
///
/// Now that the result of the PHI instruction is an SGPR, the register
/// allocator is now forced to constrain the register class of %vreg3 to
/// <sgpr> so we end up with final code like this:
///
/// BB0:
/// %vreg0 <sgpr> = SCALAR_INST
/// ...
/// BRANCH %cond BB1, BB2
/// BB1:
/// %vreg2 <vgpr> = VECTOR_INST
/// %vreg3 <sgpr> = COPY %vreg2 <vgpr>
/// BB2:
/// %vreg4 <sgpr> = PHI %vreg0 <sgpr>, <BB#0>, %vreg3 <sgpr>, <BB#1>
/// %vreg5 <vgpr> = VECTOR_INST %vreg4 <sgpr>
///
/// Now this code contains an illegal copy from a VGPR to an SGPR.
///
/// In order to avoid this problem, this pass searches for PHI instructions
/// which define a <vsrc> register and constrains its definition class to
/// <vgpr> if the user of the PHI's definition register is a vector instruction.
/// If the PHI's definition class is constrained to <vgpr> then the coalescer
/// will be unable to perform the COPY removal from the above example which
/// ultimately led to the creation of an illegal COPY.
//===----------------------------------------------------------------------===//
#include "AMDGPU.h"
#include "AMDGPUSubtarget.h"
#include "SIInstrInfo.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
using namespace llvm;
#define DEBUG_TYPE "si-fix-sgpr-copies"
static cl::opt<bool> EnableM0Merge(
"amdgpu-enable-merge-m0",
cl::desc("Merge and hoist M0 initializations"),
cl::init(false));
namespace {
class SIFixSGPRCopies : public MachineFunctionPass {
MachineDominatorTree *MDT;
public:
static char ID;
SIFixSGPRCopies() : MachineFunctionPass(ID) { }
bool runOnMachineFunction(MachineFunction &MF) override;
StringRef getPassName() const override { return "SI Fix SGPR copies"; }
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.addRequired<MachineDominatorTree>();
AU.addPreserved<MachineDominatorTree>();
AU.setPreservesCFG();
MachineFunctionPass::getAnalysisUsage(AU);
}
};
} // End anonymous namespace
INITIALIZE_PASS_BEGIN(SIFixSGPRCopies, DEBUG_TYPE,
"SI Fix SGPR copies", false, false)
INITIALIZE_PASS_DEPENDENCY(MachineDominatorTree)
INITIALIZE_PASS_END(SIFixSGPRCopies, DEBUG_TYPE,
"SI Fix SGPR copies", false, false)
char SIFixSGPRCopies::ID = 0;
char &llvm::SIFixSGPRCopiesID = SIFixSGPRCopies::ID;
FunctionPass *llvm::createSIFixSGPRCopiesPass() {
return new SIFixSGPRCopies();
}
static bool hasVGPROperands(const MachineInstr &MI, const SIRegisterInfo *TRI) {
const MachineRegisterInfo &MRI = MI.getParent()->getParent()->getRegInfo();
for (unsigned i = 0, e = MI.getNumOperands(); i != e; ++i) {
if (!MI.getOperand(i).isReg() ||
!TargetRegisterInfo::isVirtualRegister(MI.getOperand(i).getReg()))
continue;
if (TRI->hasVGPRs(MRI.getRegClass(MI.getOperand(i).getReg())))
return true;
}
return false;
}
static std::pair<const TargetRegisterClass *, const TargetRegisterClass *>
getCopyRegClasses(const MachineInstr &Copy,
const SIRegisterInfo &TRI,
const MachineRegisterInfo &MRI) {
unsigned DstReg = Copy.getOperand(0).getReg();
unsigned SrcReg = Copy.getOperand(1).getReg();
const TargetRegisterClass *SrcRC =
TargetRegisterInfo::isVirtualRegister(SrcReg) ?
MRI.getRegClass(SrcReg) :
TRI.getPhysRegClass(SrcReg);
// We don't really care about the subregister here.
// SrcRC = TRI.getSubRegClass(SrcRC, Copy.getOperand(1).getSubReg());
const TargetRegisterClass *DstRC =
TargetRegisterInfo::isVirtualRegister(DstReg) ?
MRI.getRegClass(DstReg) :
TRI.getPhysRegClass(DstReg);
return std::make_pair(SrcRC, DstRC);
}
static bool isVGPRToSGPRCopy(const TargetRegisterClass *SrcRC,
const TargetRegisterClass *DstRC,
const SIRegisterInfo &TRI) {
return TRI.isSGPRClass(DstRC) && TRI.hasVGPRs(SrcRC);
}
static bool isSGPRToVGPRCopy(const TargetRegisterClass *SrcRC,
const TargetRegisterClass *DstRC,
const SIRegisterInfo &TRI) {
return TRI.isSGPRClass(SrcRC) && TRI.hasVGPRs(DstRC);
}
// Distribute an SGPR->VGPR copy of a REG_SEQUENCE into a VGPR REG_SEQUENCE.
//
// SGPRx = ...
// SGPRy = REG_SEQUENCE SGPRx, sub0 ...
// VGPRz = COPY SGPRy
//
// ==>
//
// VGPRx = COPY SGPRx
// VGPRz = REG_SEQUENCE VGPRx, sub0
//
// This exposes immediate folding opportunities when materializing 64-bit
// immediates.
static bool foldVGPRCopyIntoRegSequence(MachineInstr &MI,
const SIRegisterInfo *TRI,
const SIInstrInfo *TII,
MachineRegisterInfo &MRI) {
assert(MI.isRegSequence());
unsigned DstReg = MI.getOperand(0).getReg();
if (!TRI->isSGPRClass(MRI.getRegClass(DstReg)))
return false;
if (!MRI.hasOneUse(DstReg))
return false;
MachineInstr &CopyUse = *MRI.use_instr_begin(DstReg);
if (!CopyUse.isCopy())
return false;
// It is illegal to have vreg inputs to a physreg defining reg_sequence.
if (TargetRegisterInfo::isPhysicalRegister(CopyUse.getOperand(0).getReg()))
return false;
const TargetRegisterClass *SrcRC, *DstRC;
std::tie(SrcRC, DstRC) = getCopyRegClasses(CopyUse, *TRI, MRI);
if (!isSGPRToVGPRCopy(SrcRC, DstRC, *TRI))
return false;
// TODO: Could have multiple extracts?
unsigned SubReg = CopyUse.getOperand(1).getSubReg();
if (SubReg != AMDGPU::NoSubRegister)
return false;
MRI.setRegClass(DstReg, DstRC);
// SGPRx = ...
// SGPRy = REG_SEQUENCE SGPRx, sub0 ...
// VGPRz = COPY SGPRy
// =>
// VGPRx = COPY SGPRx
// VGPRz = REG_SEQUENCE VGPRx, sub0
MI.getOperand(0).setReg(CopyUse.getOperand(0).getReg());
for (unsigned I = 1, N = MI.getNumOperands(); I != N; I += 2) {
unsigned SrcReg = MI.getOperand(I).getReg();
unsigned SrcSubReg = MI.getOperand(I).getSubReg();
const TargetRegisterClass *SrcRC = MRI.getRegClass(SrcReg);
assert(TRI->isSGPRClass(SrcRC) &&
"Expected SGPR REG_SEQUENCE to only have SGPR inputs");
SrcRC = TRI->getSubRegClass(SrcRC, SrcSubReg);
const TargetRegisterClass *NewSrcRC = TRI->getEquivalentVGPRClass(SrcRC);
unsigned TmpReg = MRI.createVirtualRegister(NewSrcRC);
BuildMI(*MI.getParent(), &MI, MI.getDebugLoc(), TII->get(AMDGPU::COPY),
TmpReg)
.add(MI.getOperand(I));
MI.getOperand(I).setReg(TmpReg);
}
CopyUse.eraseFromParent();
return true;
}
static bool phiHasVGPROperands(const MachineInstr &PHI,
const MachineRegisterInfo &MRI,
const SIRegisterInfo *TRI,
const SIInstrInfo *TII) {
for (unsigned i = 1; i < PHI.getNumOperands(); i += 2) {
unsigned Reg = PHI.getOperand(i).getReg();
if (TRI->hasVGPRs(MRI.getRegClass(Reg)))
return true;
}
return false;
}
static bool phiHasBreakDef(const MachineInstr &PHI,
const MachineRegisterInfo &MRI,
SmallSet<unsigned, 8> &Visited) {
for (unsigned i = 1; i < PHI.getNumOperands(); i += 2) {
unsigned Reg = PHI.getOperand(i).getReg();
if (Visited.count(Reg))
continue;
Visited.insert(Reg);
MachineInstr *DefInstr = MRI.getVRegDef(Reg);
switch (DefInstr->getOpcode()) {
default:
break;
case AMDGPU::SI_BREAK:
case AMDGPU::SI_IF_BREAK:
case AMDGPU::SI_ELSE_BREAK:
return true;
case AMDGPU::PHI:
if (phiHasBreakDef(*DefInstr, MRI, Visited))
return true;
}
}
return false;
}
static bool hasTerminatorThatModifiesExec(const MachineBasicBlock &MBB,
const TargetRegisterInfo &TRI) {
for (MachineBasicBlock::const_iterator I = MBB.getFirstTerminator(),
E = MBB.end(); I != E; ++I) {
if (I->modifiesRegister(AMDGPU::EXEC, &TRI))
return true;
}
return false;
}
static bool isSafeToFoldImmIntoCopy(const MachineInstr *Copy,
const MachineInstr *MoveImm,
const SIInstrInfo *TII,
unsigned &SMovOp,
int64_t &Imm) {
if (!MoveImm->isMoveImmediate())
return false;
const MachineOperand *ImmOp =
TII->getNamedOperand(*MoveImm, AMDGPU::OpName::src0);
if (!ImmOp->isImm())
return false;
// FIXME: Handle copies with sub-regs.
if (Copy->getOperand(0).getSubReg())
return false;
switch (MoveImm->getOpcode()) {
default:
return false;
case AMDGPU::V_MOV_B32_e32:
SMovOp = AMDGPU::S_MOV_B32;
break;
case AMDGPU::V_MOV_B64_PSEUDO:
SMovOp = AMDGPU::S_MOV_B64;
break;
}
Imm = ImmOp->getImm();
return true;
}
template <class UnaryPredicate>
bool searchPredecessors(const MachineBasicBlock *MBB,
const MachineBasicBlock *CutOff,
UnaryPredicate Predicate) {
if (MBB == CutOff)
return false;
DenseSet<const MachineBasicBlock*> Visited;
SmallVector<MachineBasicBlock*, 4> Worklist(MBB->pred_begin(),
MBB->pred_end());
while (!Worklist.empty()) {
MachineBasicBlock *MBB = Worklist.pop_back_val();
if (!Visited.insert(MBB).second)
continue;
if (MBB == CutOff)
continue;
if (Predicate(MBB))
return true;
Worklist.append(MBB->pred_begin(), MBB->pred_end());
}
return false;
}
static bool predsHasDivergentTerminator(MachineBasicBlock *MBB,
const TargetRegisterInfo *TRI) {
return searchPredecessors(MBB, nullptr, [TRI](MachineBasicBlock *MBB) {
return hasTerminatorThatModifiesExec(*MBB, *TRI); });
}
// Checks if there is potential path From instruction To instruction.
// If CutOff is specified and it sits in between of that path we ignore
// a higher portion of the path and report it is not reachable.
static bool isReachable(const MachineInstr *From,
const MachineInstr *To,
const MachineBasicBlock *CutOff,
MachineDominatorTree &MDT) {
// If either From block dominates To block or instructions are in the same
// block and From is higher.
if (MDT.dominates(From, To))
return true;
const MachineBasicBlock *MBBFrom = From->getParent();
const MachineBasicBlock *MBBTo = To->getParent();
if (MBBFrom == MBBTo)
return false;
// Instructions are in different blocks, do predecessor search.
// We should almost never get here since we do not usually produce M0 stores
// other than -1.
return searchPredecessors(MBBTo, CutOff, [MBBFrom]
(const MachineBasicBlock *MBB) { return MBB == MBBFrom; });
}
// Hoist and merge identical SGPR initializations into a common predecessor.
// This is intended to combine M0 initializations, but can work with any
// SGPR. A VGPR cannot be processed since we cannot guarantee vector
// executioon.
static bool hoistAndMergeSGPRInits(unsigned Reg,
const MachineRegisterInfo &MRI,
MachineDominatorTree &MDT) {
// List of inits by immediate value.
typedef std::map<unsigned, std::list<MachineInstr*>> InitListMap;
InitListMap Inits;
// List of clobbering instructions.
SmallVector<MachineInstr*, 8> Clobbers;
bool Changed = false;
for (auto &MI : MRI.def_instructions(Reg)) {
MachineOperand *Imm = nullptr;
for (auto &MO: MI.operands()) {
if ((MO.isReg() && ((MO.isDef() && MO.getReg() != Reg) || !MO.isDef())) ||
(!MO.isImm() && !MO.isReg()) || (MO.isImm() && Imm)) {
Imm = nullptr;
break;
} else if (MO.isImm())
Imm = &MO;
}
if (Imm)
Inits[Imm->getImm()].push_front(&MI);
else
Clobbers.push_back(&MI);
}
for (auto &Init : Inits) {
auto &Defs = Init.second;
for (auto I1 = Defs.begin(), E = Defs.end(); I1 != E; ) {
MachineInstr *MI1 = *I1;
for (auto I2 = std::next(I1); I2 != E; ) {
MachineInstr *MI2 = *I2;
// Check any possible interference
auto intereferes = [&](MachineBasicBlock::iterator From,
MachineBasicBlock::iterator To) -> bool {
assert(MDT.dominates(&*To, &*From));
auto interferes = [&MDT, From, To](MachineInstr* &Clobber) -> bool {
const MachineBasicBlock *MBBFrom = From->getParent();
const MachineBasicBlock *MBBTo = To->getParent();
bool MayClobberFrom = isReachable(Clobber, &*From, MBBTo, MDT);
bool MayClobberTo = isReachable(Clobber, &*To, MBBTo, MDT);
if (!MayClobberFrom && !MayClobberTo)
return false;
if ((MayClobberFrom && !MayClobberTo) ||
(!MayClobberFrom && MayClobberTo))
return true;
// Both can clobber, this is not an interference only if both are
// dominated by Clobber and belong to the same block or if Clobber
// properly dominates To, given that To >> From, so it dominates
// both and located in a common dominator.
return !((MBBFrom == MBBTo &&
MDT.dominates(Clobber, &*From) &&
MDT.dominates(Clobber, &*To)) ||
MDT.properlyDominates(Clobber->getParent(), MBBTo));
};
return (any_of(Clobbers, interferes)) ||
(any_of(Inits, [&](InitListMap::value_type &C) {
return C.first != Init.first && any_of(C.second, interferes);
}));
};
if (MDT.dominates(MI1, MI2)) {
if (!intereferes(MI2, MI1)) {
DEBUG(dbgs() << "Erasing from BB#" << MI2->getParent()->getNumber()
<< " " << *MI2);
MI2->eraseFromParent();
Defs.erase(I2++);
Changed = true;
continue;
}
} else if (MDT.dominates(MI2, MI1)) {
if (!intereferes(MI1, MI2)) {
DEBUG(dbgs() << "Erasing from BB#" << MI1->getParent()->getNumber()
<< " " << *MI1);
MI1->eraseFromParent();
Defs.erase(I1++);
Changed = true;
break;
}
} else {
auto *MBB = MDT.findNearestCommonDominator(MI1->getParent(),
MI2->getParent());
if (!MBB) {
++I2;
continue;
}
MachineBasicBlock::iterator I = MBB->getFirstNonPHI();
if (!intereferes(MI1, I) && !intereferes(MI2, I)) {
DEBUG(dbgs() << "Erasing from BB#" << MI1->getParent()->getNumber()
<< " " << *MI1 << "and moving from BB#"
<< MI2->getParent()->getNumber() << " to BB#"
<< I->getParent()->getNumber() << " " << *MI2);
I->getParent()->splice(I, MI2->getParent(), MI2);
MI1->eraseFromParent();
Defs.erase(I1++);
Changed = true;
break;
}
}
++I2;
}
++I1;
}
}
if (Changed)
MRI.clearKillFlags(Reg);
return Changed;
}
bool SIFixSGPRCopies::runOnMachineFunction(MachineFunction &MF) {
const SISubtarget &ST = MF.getSubtarget<SISubtarget>();
MachineRegisterInfo &MRI = MF.getRegInfo();
const SIRegisterInfo *TRI = ST.getRegisterInfo();
const SIInstrInfo *TII = ST.getInstrInfo();
MDT = &getAnalysis<MachineDominatorTree>();
SmallVector<MachineInstr *, 16> Worklist;
for (MachineFunction::iterator BI = MF.begin(), BE = MF.end();
BI != BE; ++BI) {
MachineBasicBlock &MBB = *BI;
for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end();
I != E; ++I) {
MachineInstr &MI = *I;
switch (MI.getOpcode()) {
default:
continue;
case AMDGPU::COPY: {
// If the destination register is a physical register there isn't really
// much we can do to fix this.
if (!TargetRegisterInfo::isVirtualRegister(MI.getOperand(0).getReg()))
continue;
const TargetRegisterClass *SrcRC, *DstRC;
std::tie(SrcRC, DstRC) = getCopyRegClasses(MI, *TRI, MRI);
if (isVGPRToSGPRCopy(SrcRC, DstRC, *TRI)) {
unsigned SrcReg = MI.getOperand(1).getReg();
if (!TargetRegisterInfo::isVirtualRegister(SrcReg)) {
TII->moveToVALU(MI);
break;
}
MachineInstr *DefMI = MRI.getVRegDef(SrcReg);
unsigned SMovOp;
int64_t Imm;
// If we are just copying an immediate, we can replace the copy with
// s_mov_b32.
if (isSafeToFoldImmIntoCopy(&MI, DefMI, TII, SMovOp, Imm)) {
MI.getOperand(1).ChangeToImmediate(Imm);
MI.addImplicitDefUseOperands(MF);
MI.setDesc(TII->get(SMovOp));
break;
}
TII->moveToVALU(MI);
}
break;
}
case AMDGPU::PHI: {
unsigned Reg = MI.getOperand(0).getReg();
if (!TRI->isSGPRClass(MRI.getRegClass(Reg)))
break;
// We don't need to fix the PHI if the common dominator of the
// two incoming blocks terminates with a uniform branch.
if (MI.getNumExplicitOperands() == 5) {
MachineBasicBlock *MBB0 = MI.getOperand(2).getMBB();
MachineBasicBlock *MBB1 = MI.getOperand(4).getMBB();
if (!predsHasDivergentTerminator(MBB0, TRI) &&
!predsHasDivergentTerminator(MBB1, TRI)) {
DEBUG(dbgs() << "Not fixing PHI for uniform branch: " << MI << '\n');
break;
}
}
// If a PHI node defines an SGPR and any of its operands are VGPRs,
// then we need to move it to the VALU.
//
// Also, if a PHI node defines an SGPR and has all SGPR operands
// we must move it to the VALU, because the SGPR operands will
// all end up being assigned the same register, which means
// there is a potential for a conflict if different threads take
// different control flow paths.
//
// For Example:
//
// sgpr0 = def;
// ...
// sgpr1 = def;
// ...
// sgpr2 = PHI sgpr0, sgpr1
// use sgpr2;
//
// Will Become:
//
// sgpr2 = def;
// ...
// sgpr2 = def;
// ...
// use sgpr2
//
// The one exception to this rule is when one of the operands
// is defined by a SI_BREAK, SI_IF_BREAK, or SI_ELSE_BREAK
// instruction. In this case, there we know the program will
// never enter the second block (the loop) without entering
// the first block (where the condition is computed), so there
// is no chance for values to be over-written.
SmallSet<unsigned, 8> Visited;
if (phiHasVGPROperands(MI, MRI, TRI, TII) ||
!phiHasBreakDef(MI, MRI, Visited)) {
DEBUG(dbgs() << "Fixing PHI: " << MI);
TII->moveToVALU(MI);
}
break;
}
case AMDGPU::REG_SEQUENCE: {
if (TRI->hasVGPRs(TII->getOpRegClass(MI, 0)) ||
!hasVGPROperands(MI, TRI)) {
foldVGPRCopyIntoRegSequence(MI, TRI, TII, MRI);
continue;
}
DEBUG(dbgs() << "Fixing REG_SEQUENCE: " << MI);
TII->moveToVALU(MI);
break;
}
case AMDGPU::INSERT_SUBREG: {
const TargetRegisterClass *DstRC, *Src0RC, *Src1RC;
DstRC = MRI.getRegClass(MI.getOperand(0).getReg());
Src0RC = MRI.getRegClass(MI.getOperand(1).getReg());
Src1RC = MRI.getRegClass(MI.getOperand(2).getReg());
if (TRI->isSGPRClass(DstRC) &&
(TRI->hasVGPRs(Src0RC) || TRI->hasVGPRs(Src1RC))) {
DEBUG(dbgs() << " Fixing INSERT_SUBREG: " << MI);
TII->moveToVALU(MI);
}
break;
}
}
}
}
if (MF.getTarget().getOptLevel() > CodeGenOpt::None && EnableM0Merge)
hoistAndMergeSGPRInits(AMDGPU::M0, MRI, *MDT);
return true;
}
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