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Fixup register kills after scheduling.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80002 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -40,6 +40,7 @@
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/ADT/Statistic.h"
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#include <map>
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#include <set>
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using namespace llvm;
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STATISTIC(NumNoops, "Number of noops inserted");
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@ -140,6 +141,11 @@ namespace {
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/// Schedule - Schedule the instruction range using list scheduling.
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///
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void Schedule();
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/// FixupKills - Fix register kill flags that have been made
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/// invalid due to scheduling
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///
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void FixupKills(MachineBasicBlock *MBB);
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/// Observe - Update liveness information to account for the current
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/// instruction, which will not be scheduled.
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@ -150,6 +156,11 @@ namespace {
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///
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void FinishBlock();
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/// GenerateLivenessForKills - If true then generate Def/Kill
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/// information for use in updating register kill. If false then
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/// generate Def/Kill information for anti-dependence breaking.
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bool GenerateLivenessForKills;
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private:
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void PrescanInstruction(MachineInstr *MI);
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void ScanInstruction(MachineInstr *MI, unsigned Count);
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@ -202,6 +213,7 @@ bool PostRAScheduler::runOnMachineFunction(MachineFunction &Fn) {
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for (MachineFunction::iterator MBB = Fn.begin(), MBBe = Fn.end();
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MBB != MBBe; ++MBB) {
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// Initialize register live-range state for scheduling in this block.
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Scheduler.GenerateLivenessForKills = false;
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Scheduler.StartBlock(MBB);
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// Schedule each sequence of instructions not interrupted by a label
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@ -228,6 +240,12 @@ bool PostRAScheduler::runOnMachineFunction(MachineFunction &Fn) {
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// Clean up register live-range state.
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Scheduler.FinishBlock();
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// Initialize register live-range state again and update register kills
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Scheduler.GenerateLivenessForKills = true;
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Scheduler.StartBlock(MBB);
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Scheduler.FixupKills(MBB);
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Scheduler.FinishBlock();
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}
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return true;
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@ -287,26 +305,28 @@ void SchedulePostRATDList::StartBlock(MachineBasicBlock *BB) {
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}
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}
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// Consider callee-saved registers as live-out, since we're running after
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// prologue/epilogue insertion so there's no way to add additional
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// saved registers.
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//
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// TODO: If the callee saves and restores these, then we can potentially
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// use them between the save and the restore. To do that, we could scan
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// the exit blocks to see which of these registers are defined.
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// Alternatively, callee-saved registers that aren't saved and restored
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// could be marked live-in in every block.
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for (const unsigned *I = TRI->getCalleeSavedRegs(); *I; ++I) {
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unsigned Reg = *I;
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Classes[Reg] = reinterpret_cast<TargetRegisterClass *>(-1);
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KillIndices[Reg] = BB->size();
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DefIndices[Reg] = ~0u;
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// Repeat, for all aliases.
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for (const unsigned *Alias = TRI->getAliasSet(Reg); *Alias; ++Alias) {
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unsigned AliasReg = *Alias;
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Classes[AliasReg] = reinterpret_cast<TargetRegisterClass *>(-1);
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KillIndices[AliasReg] = BB->size();
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DefIndices[AliasReg] = ~0u;
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if (!GenerateLivenessForKills) {
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// Consider callee-saved registers as live-out, since we're running after
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// prologue/epilogue insertion so there's no way to add additional
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// saved registers.
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//
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// TODO: If the callee saves and restores these, then we can potentially
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// use them between the save and the restore. To do that, we could scan
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// the exit blocks to see which of these registers are defined.
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// Alternatively, callee-saved registers that aren't saved and restored
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// could be marked live-in in every block.
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for (const unsigned *I = TRI->getCalleeSavedRegs(); *I; ++I) {
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unsigned Reg = *I;
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Classes[Reg] = reinterpret_cast<TargetRegisterClass *>(-1);
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KillIndices[Reg] = BB->size();
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DefIndices[Reg] = ~0u;
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// Repeat, for all aliases.
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for (const unsigned *Alias = TRI->getAliasSet(Reg); *Alias; ++Alias) {
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unsigned AliasReg = *Alias;
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Classes[AliasReg] = reinterpret_cast<TargetRegisterClass *>(-1);
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KillIndices[AliasReg] = BB->size();
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DefIndices[AliasReg] = ~0u;
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}
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}
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}
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}
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@ -467,11 +487,17 @@ void SchedulePostRATDList::ScanInstruction(MachineInstr *MI,
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Classes[SubregReg] = 0;
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RegRefs.erase(SubregReg);
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}
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// Conservatively mark super-registers as unusable.
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// Conservatively mark super-registers as unusable. If
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// initializing for kill updating, then mark all supers as defined
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// as well.
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for (const unsigned *Super = TRI->getSuperRegisters(Reg);
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*Super; ++Super) {
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unsigned SuperReg = *Super;
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Classes[SuperReg] = reinterpret_cast<TargetRegisterClass *>(-1);
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if (GenerateLivenessForKills) {
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DefIndices[SuperReg] = Count;
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KillIndices[SuperReg] = ~0u;
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}
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}
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}
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for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
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@ -753,6 +779,53 @@ bool SchedulePostRATDList::BreakAntiDependencies() {
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return Changed;
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}
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/// FixupKills - Fix the register kill flags, they may have been made
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/// incorrect by instruction reordering.
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///
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void SchedulePostRATDList::FixupKills(MachineBasicBlock *MBB) {
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DEBUG(errs() << "Fixup kills for BB ID#" << MBB->getNumber() << '\n');
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std::set<unsigned> killedRegs;
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BitVector ReservedRegs = TRI->getReservedRegs(MF);
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unsigned Count = MBB->size();
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for (MachineBasicBlock::iterator I = MBB->end(), E = MBB->begin();
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I != E; --Count) {
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MachineInstr *MI = --I;
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// After regalloc, IMPLICIT_DEF instructions aren't safe to treat as
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// dependence-breaking. In the case of an INSERT_SUBREG, the IMPLICIT_DEF
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// is left behind appearing to clobber the super-register, while the
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// subregister needs to remain live. So we just ignore them.
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if (MI->getOpcode() == TargetInstrInfo::IMPLICIT_DEF)
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continue;
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PrescanInstruction(MI);
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ScanInstruction(MI, Count);
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// Examine all used registers and set kill flag. When a register
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// is used multiple times we only set the kill flag on the first
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// use.
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killedRegs.clear();
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for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
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MachineOperand &MO = MI->getOperand(i);
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if (!MO.isReg() || !MO.isUse()) continue;
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unsigned Reg = MO.getReg();
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if ((Reg == 0) || ReservedRegs.test(Reg)) continue;
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bool kill = ((KillIndices[Reg] == Count) &&
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(killedRegs.find(Reg) == killedRegs.end()));
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if (MO.isKill() != kill) {
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MO.setIsKill(kill);
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DEBUG(errs() << "Fixed " << MO << " in ");
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DEBUG(MI->dump());
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}
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killedRegs.insert(Reg);
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}
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}
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}
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//===----------------------------------------------------------------------===//
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// Top-Down Scheduling
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//===----------------------------------------------------------------------===//
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40
test/CodeGen/ARM/2009-08-21-PostRAKill.ll
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40
test/CodeGen/ARM/2009-08-21-PostRAKill.ll
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; RUN: llvm-as < %s | llc -march=arm -mattr=+vfp2 -mcpu=cortex-a8 -disable-post-RA-scheduler=0 -avoid-hazards
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; ModuleID = '<stdin>'
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:64:64-v128:128:128-a0:0:64"
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target triple = "armv7-apple-darwin9"
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%struct.tree = type { i32, double, double, %struct.tree*, %struct.tree*, %struct.tree*, %struct.tree* }
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@g = common global %struct.tree* null
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define arm_apcscc %struct.tree* @tsp(%struct.tree* %t, i32 %nproc) nounwind {
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entry:
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%t.idx51.val.i = load double* null ; <double> [#uses=1]
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br i1 undef, label %bb4.i, label %bb.i
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bb.i: ; preds = %entry
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unreachable
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bb4.i: ; preds = %entry
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%0 = load %struct.tree** @g, align 4 ; <%struct.tree*> [#uses=2]
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%.idx45.i = getelementptr %struct.tree* %0, i32 0, i32 1 ; <double*> [#uses=1]
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%.idx45.val.i = load double* %.idx45.i ; <double> [#uses=1]
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%.idx46.i = getelementptr %struct.tree* %0, i32 0, i32 2 ; <double*> [#uses=1]
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%.idx46.val.i = load double* %.idx46.i ; <double> [#uses=1]
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%1 = fsub double 0.000000e+00, %.idx45.val.i ; <double> [#uses=2]
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%2 = fmul double %1, %1 ; <double> [#uses=1]
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%3 = fsub double %t.idx51.val.i, %.idx46.val.i ; <double> [#uses=2]
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%4 = fmul double %3, %3 ; <double> [#uses=1]
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%5 = fadd double %2, %4 ; <double> [#uses=1]
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%6 = tail call double @llvm.sqrt.f64(double %5) nounwind ; <double> [#uses=1]
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br i1 undef, label %bb7.i4, label %bb6.i
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bb6.i: ; preds = %bb4.i
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br label %bb7.i4
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bb7.i4: ; preds = %bb6.i, %bb4.i
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%tton1.0.i = phi double [ %6, %bb6.i ], [ undef, %bb4.i ] ; <double> [#uses=0]
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unreachable
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}
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declare double @llvm.sqrt.f64(double) nounwind readonly
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test/CodeGen/ARM/2009-08-21-PostRAKill2.ll
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38
test/CodeGen/ARM/2009-08-21-PostRAKill2.ll
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@ -0,0 +1,38 @@
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; RUN: llvm-as < %s | llc -asm-verbose=false -O3 -relocation-model=pic -disable-fp-elim -mtriple=thumbv7-apple-darwin -mcpu=cortex-a8 -disable-post-RA-scheduler=0 -avoid-hazards
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; ModuleID = '<stdin>'
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:64:64-v128:128:128-a0:0:64"
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target triple = "armv7-apple-darwin9"
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%struct.anon = type { [3 x double], double, %struct.node*, [64 x %struct.bnode*], [64 x %struct.bnode*] }
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%struct.bnode = type { i16, double, [3 x double], i32, i32, [3 x double], [3 x double], [3 x double], double, %struct.bnode*, %struct.bnode* }
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%struct.icstruct = type { [3 x i32], i16 }
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%struct.node = type { i16, double, [3 x double], i32, i32 }
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declare arm_apcscc double @floor(double) nounwind readnone
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define void @intcoord(%struct.icstruct* noalias nocapture sret %agg.result, i1 %a, double %b) {
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entry:
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br i1 %a, label %bb3, label %bb1
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bb1: ; preds = %entry
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unreachable
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bb3: ; preds = %entry
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br i1 %a, label %bb7, label %bb5
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bb5: ; preds = %bb3
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unreachable
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bb7: ; preds = %bb3
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br i1 %a, label %bb11, label %bb9
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bb9: ; preds = %bb7
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%0 = tail call arm_apcscc double @floor(double %b) nounwind readnone ; <double> [#uses=0]
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br label %bb11
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bb11: ; preds = %bb9, %bb7
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%1 = getelementptr %struct.icstruct* %agg.result, i32 0, i32 0, i32 0 ; <i32*> [#uses=1]
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store i32 0, i32* %1
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ret void
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}
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test/CodeGen/ARM/2009-08-21-PostRAKill3.ll
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31
test/CodeGen/ARM/2009-08-21-PostRAKill3.ll
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@ -0,0 +1,31 @@
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; RUN: llvm-as < %s | llc -asm-verbose=false -O3 -relocation-model=pic -disable-fp-elim -mtriple=thumbv7-apple-darwin -mcpu=cortex-a8 -disable-post-RA-scheduler=0 -avoid-hazards
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; ModuleID = '<stdin>'
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:64:64-v128:128:128-a0:0:64"
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target triple = "armv7-apple-darwin9"
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%struct.Hosp = type { i32, i32, i32, %struct.List, %struct.List, %struct.List, %struct.List }
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%struct.List = type { %struct.List*, %struct.Patient*, %struct.List* }
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%struct.Patient = type { i32, i32, i32, %struct.Village* }
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%struct.Village = type { [4 x %struct.Village*], %struct.Village*, %struct.List, %struct.Hosp, i32, i32 }
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define arm_apcscc %struct.Village* @alloc_tree(i32 %level, i32 %label, %struct.Village* %back, i1 %p) nounwind {
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entry:
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br i1 %p, label %bb8, label %bb1
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bb1: ; preds = %entry
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%0 = malloc %struct.Village ; <%struct.Village*> [#uses=3]
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%exp2 = call double @ldexp(double 1.000000e+00, i32 %level) nounwind ; <double> [#uses=1]
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%.c = fptosi double %exp2 to i32 ; <i32> [#uses=1]
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store i32 %.c, i32* null
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%1 = getelementptr %struct.Village* %0, i32 0, i32 3, i32 6, i32 0 ; <%struct.List**> [#uses=1]
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store %struct.List* null, %struct.List** %1
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%2 = getelementptr %struct.Village* %0, i32 0, i32 3, i32 6, i32 2 ; <%struct.List**> [#uses=1]
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store %struct.List* null, %struct.List** %2
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ret %struct.Village* %0
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bb8: ; preds = %entry
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ret %struct.Village* null
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}
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declare double @ldexp(double, i32)
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