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Disable the PPC CTR-Loops pass by default.

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The pass itself works well, but the something in the Machine* infrastructure
does not understand terminators which define registers. Without the ability
to use the block-placement pass, etc. this causes performance regressions (and
so is turned off by default). Turning off the analysis turns off the problems
with the Machine* infrastructure.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158206 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel 2012-06-08 15:38:25 +00:00
parent daa03ec604
commit 09fdc7baae
4 changed files with 19 additions and 6 deletions
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12
lib/Target/PowerPC/PPCInstrInfo.cpp
View File

@ -40,6 +40,10 @@ extern cl::opt<bool> DisablePPC64RS;
using namespace llvm;
static cl::
opt<bool> EnableCTRLoopAnal("enable-ppc-ctrloop-analysis", cl::Hidden,
cl::desc("Enable analysis for CTR loops (experimental)"));
PPCInstrInfo::PPCInstrInfo(PPCTargetMachine &tm)
: PPCGenInstrInfo(PPC::ADJCALLSTACKDOWN, PPC::ADJCALLSTACKUP),
TM(tm), RI(*TM.getSubtargetImpl(), *this) {}
@ -229,6 +233,8 @@ bool PPCInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
LastInst->getOpcode() == PPC::BDNZ) {
if (!LastInst->getOperand(0).isMBB())
return true;
if (!EnableCTRLoopAnal)
return true;
TBB = LastInst->getOperand(0).getMBB();
Cond.push_back(MachineOperand::CreateImm(1));
Cond.push_back(MachineOperand::CreateReg(isPPC64 ? PPC::CTR8 : PPC::CTR,
@ -238,6 +244,8 @@ bool PPCInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
LastInst->getOpcode() == PPC::BDZ) {
if (!LastInst->getOperand(0).isMBB())
return true;
if (!EnableCTRLoopAnal)
return true;
TBB = LastInst->getOperand(0).getMBB();
Cond.push_back(MachineOperand::CreateImm(0));
Cond.push_back(MachineOperand::CreateReg(isPPC64 ? PPC::CTR8 : PPC::CTR,
@ -274,6 +282,8 @@ bool PPCInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
if (!SecondLastInst->getOperand(0).isMBB() ||
!LastInst->getOperand(0).isMBB())
return true;
if (!EnableCTRLoopAnal)
return true;
TBB = SecondLastInst->getOperand(0).getMBB();
Cond.push_back(MachineOperand::CreateImm(1));
Cond.push_back(MachineOperand::CreateReg(isPPC64 ? PPC::CTR8 : PPC::CTR,
@ -286,6 +296,8 @@ bool PPCInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
if (!SecondLastInst->getOperand(0).isMBB() ||
!LastInst->getOperand(0).isMBB())
return true;
if (!EnableCTRLoopAnal)
return true;
TBB = SecondLastInst->getOperand(0).getMBB();
Cond.push_back(MachineOperand::CreateImm(0));
Cond.push_back(MachineOperand::CreateReg(isPPC64 ? PPC::CTR8 : PPC::CTR,

9
lib/Target/PowerPC/PPCTargetMachine.cpp
View File

@ -23,8 +23,8 @@
using namespace llvm;
static cl::
opt<bool> DisableCTRLoops("disable-ppc-ctrloops", cl::Hidden,
cl::desc("Disable CTR loops for PPC"));
opt<bool> EnableCTRLoops("enable-ppc-ctrloops", cl::Hidden,
cl::desc("Enable CTR loops for PPC"));
extern "C" void LLVMInitializePowerPCTarget() {
// Register the targets
@ -103,9 +103,10 @@ TargetPassConfig *PPCTargetMachine::createPassConfig(PassManagerBase &PM) {
}
bool PPCPassConfig::addPreRegAlloc() {
if (!DisableCTRLoops && getOptLevel() != CodeGenOpt::None) {
// FIXME: Once this can be enabled by default, this condition should read:
// if (!DisableCTRLoops && getOptLevel() != CodeGenOpt::None)
if (EnableCTRLoops)
PM->add(createPPCCTRLoops());
}
return false;
}

2
test/CodeGen/PowerPC/ctrloop-reg.ll
View File

@ -1,7 +1,7 @@
; ModuleID = 'bugpoint-reduced-simplified.bc'
target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v128:128:128-n32:64"
target triple = "powerpc64-unknown-linux-gnu"
; RUN: llc < %s -march=ppc64 | FileCheck %s
; RUN: llc -enable-ppc-ctrloops < %s -march=ppc64 | FileCheck %s
%struct.ref_s.1.49.91.115.121.139.145.151.157.163.169.175.181.211 = type { %union.v.0.48.90.114.120.138.144.150.156.162.168.174.180.210, i16, i16 }
%union.v.0.48.90.114.120.138.144.150.156.162.168.174.180.210 = type { i64 }

2
test/CodeGen/PowerPC/ctrloops.ll
View File

@ -1,6 +1,6 @@
target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v128:128:128-n32:64"
target triple = "powerpc64-unknown-freebsd10.0"
; RUN: llc < %s -march=ppc64 | FileCheck %s
; RUN: llc -enable-ppc-ctrloops -enable-ppc-ctrloop-analysis < %s -march=ppc64 | FileCheck %s
@a = common global i32 0, align 4