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pull a nested loop of this pass out to its own function,

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eliminating the gymnastics around the ContainsFPCode var.

llvm-svn: 104328
This commit is contained in:
Chris Lattner 2010-05-21 17:57:03 +00:00
parent 91ffa7a5bf
commit 2077759153
1 changed files with 55 additions and 42 deletions
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97
lib/Target/X86/X86FloatingPointRegKill.cpp
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@ -53,6 +53,52 @@ FunctionPass *llvm::createX87FPRegKillInserterPass() {
return new FPRegKiller();
}
/// ContainsFPStackCode - Return true if the specific MBB has floating point
/// stack code, and thus needs an FP_REG_KILL.
static bool ContainsFPStackCode(MachineBasicBlock *MBB, unsigned SSELevel,
MachineRegisterInfo &MRI) {
for (MachineBasicBlock::iterator I = MBB->begin(), E = MBB->end();
I != E; ++I) {
if (I->getNumOperands() != 0 && I->getOperand(0).isReg()) {
for (unsigned op = 0, e = I->getNumOperands(); op != e; ++op) {
if (I->getOperand(op).isReg() && I->getOperand(op).isDef() &&
TargetRegisterInfo::isVirtualRegister(I->getOperand(op).getReg())) {
const TargetRegisterClass *RegClass =
MRI.getRegClass(I->getOperand(op).getReg());
if (RegClass == X86::RFP32RegisterClass ||
RegClass == X86::RFP64RegisterClass ||
RegClass == X86::RFP80RegisterClass)
return true;
}
}
}
}
// Check PHI nodes in successor blocks. These PHI's will be lowered to have
// a copy of the input value in this block. In SSE mode, we only care about
// 80-bit values.
// Final check, check LLVM BB's that are successors to the LLVM BB
// corresponding to BB for FP PHI nodes.
const BasicBlock *LLVMBB = MBB->getBasicBlock();
for (succ_const_iterator SI = succ_begin(LLVMBB), E = succ_end(LLVMBB);
SI != E; ++SI) {
const PHINode *PN;
for (BasicBlock::const_iterator II = SI->begin();
(PN = dyn_cast<PHINode>(II)); ++II) {
if (PN->getType()->isX86_FP80Ty() ||
(SSELevel == 0 && PN->getType()->isFloatingPointTy()) ||
(SSELevel < 2 && PN->getType()->isDoubleTy())) {
return true;
}
}
}
return false;
}
bool FPRegKiller::runOnMachineFunction(MachineFunction &MF) {
// If we are emitting FP stack code, scan the basic block to determine if this
// block defines any FP values. If so, put an FP_REG_KILL instruction before
@ -75,8 +121,14 @@ bool FPRegKiller::runOnMachineFunction(MachineFunction &MF) {
MRI.getRegClassVirtRegs(X86::RFP32RegisterClass).empty())
return false;
bool Changed = false;
const X86Subtarget &Subtarget = MF.getTarget().getSubtarget<X86Subtarget>();
unsigned SSELevel = 0;
if (Subtarget.hasSSE2())
SSELevel = 2;
else if (Subtarget.hasSSE1())
SSELevel = 1;
bool Changed = false;
MachineFunction::iterator MBBI = MF.begin();
MachineFunction::iterator EndMBB = MF.end();
for (; MBBI != EndMBB; ++MBBI) {
@ -91,47 +143,8 @@ bool FPRegKiller::runOnMachineFunction(MachineFunction &MF) {
continue;
}
bool ContainsFPCode = false;
for (MachineBasicBlock::iterator I = MBB->begin(), E = MBB->end();
!ContainsFPCode && I != E; ++I) {
if (I->getNumOperands() != 0 && I->getOperand(0).isReg()) {
const TargetRegisterClass *clas;
for (unsigned op = 0, e = I->getNumOperands(); op != e; ++op) {
if (I->getOperand(op).isReg() && I->getOperand(op).isDef() &&
TargetRegisterInfo::isVirtualRegister(I->getOperand(op).getReg()) &&
((clas = MRI.getRegClass(I->getOperand(op).getReg())) ==
X86::RFP32RegisterClass ||
clas == X86::RFP64RegisterClass ||
clas == X86::RFP80RegisterClass)) {
ContainsFPCode = true;
break;
}
}
}
}
// Check PHI nodes in successor blocks. These PHI's will be lowered to have
// a copy of the input value in this block. In SSE mode, we only care about
// 80-bit values.
if (!ContainsFPCode) {
// Final check, check LLVM BB's that are successors to the LLVM BB
// corresponding to BB for FP PHI nodes.
const BasicBlock *LLVMBB = MBB->getBasicBlock();
for (succ_const_iterator SI = succ_begin(LLVMBB), E = succ_end(LLVMBB);
!ContainsFPCode && SI != E; ++SI) {
const PHINode *PN;
for (BasicBlock::const_iterator II = SI->begin();
(PN = dyn_cast<PHINode>(II)); ++II) {
if (PN->getType()->isX86_FP80Ty() ||
(!Subtarget.hasSSE1() && PN->getType()->isFloatingPointTy()) ||
(!Subtarget.hasSSE2() && PN->getType()->isDoubleTy())) {
ContainsFPCode = true;
break;
}
}
}
}
// Finally, if we found any FP code, emit the FP_REG_KILL instruction.
if (ContainsFPCode) {
// If we find any FP stack code, emit the FP_REG_KILL instruction.
if (ContainsFPStackCode(MBB, SSELevel, MRI)) {
BuildMI(*MBB, MBBI->getFirstTerminator(), DebugLoc(),
MF.getTarget().getInstrInfo()->get(X86::FP_REG_KILL));
++NumFPKill;