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A basic block that only uses RFP registers still needs the FP_REG_KILL marker.

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This fixes PR7375.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108120 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2010-07-12 02:12:47 +00:00
parent cbeb3db8fd
commit 8b78d4b5bb
1 changed files with 7 additions and 10 deletions
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17
lib/Target/X86/X86FloatingPointRegKill.cpp
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@ -72,18 +72,15 @@ static bool isFPStackVReg(unsigned RegNo, const MachineRegisterInfo &MRI) {
/// stack code, and thus needs an FP_REG_KILL.
static bool ContainsFPStackCode(MachineBasicBlock *MBB,
const MachineRegisterInfo &MRI) {
// Scan the block, looking for instructions that define fp stack vregs.
// Scan the block, looking for instructions that define or use fp stack vregs.
for (MachineBasicBlock::iterator I = MBB->begin(), E = MBB->end();
I != E; ++I) {
if (I->getNumOperands() == 0 || !I->getOperand(0).isReg())
continue;
for (unsigned op = 0, e = I->getNumOperands(); op != e; ++op) {
if (!I->getOperand(op).isReg() || !I->getOperand(op).isDef())
if (!I->getOperand(op).isReg())
continue;
if (isFPStackVReg(I->getOperand(op).getReg(), MRI))
return true;
if (unsigned Reg = I->getOperand(op).getReg())
if (isFPStackVReg(Reg, MRI))
return true;
}
}
@ -108,8 +105,8 @@ static bool ContainsFPStackCode(MachineBasicBlock *MBB,
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
// the terminator of the block.
// block defines or uses any FP values. If so, put an FP_REG_KILL instruction
// before the terminator of the block.
// Note that FP stack instructions are used in all modes for long double,
// so we always need to do this check.