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Add dynamic realignment when rematerializing the base register. 

llvm-svn: 116886
This commit is contained in:
Jim Grosbach 2010-10-20 00:02:50 +00:00
parent 104a6e9baa
commit cb6fc2b2de
1 changed files with 13 additions and 0 deletions
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13
llvm/lib/Target/ARM/ARMExpandPseudoInsts.cpp
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@ -606,6 +606,19 @@ bool ARMExpandPseudo::ExpandMBB(MachineBasicBlock &MBB) {
FramePtr, -NumBytes, ARMCC::AL, 0,
*TII);
}
// If there's dynamic realignment, adjust for it.
if (!RI.needsStackRealignment(MF)) {
MachineFrameInfo *MFI = MF.getFrameInfo();
unsigned MaxAlign = MFI->getMaxAlignment();
assert (!AFI->isThumb1OnlyFunction());
// Emit bic r6, r6, MaxAlign
unsigned bicOpc = AFI->isThumbFunction() ?
ARM::t2BICri : ARM::BICri;
AddDefaultCC(AddDefaultPred(BuildMI(MBB, MBBI, MI.getDebugLoc(),
TII->get(bicOpc), ARM::R6)
.addReg(ARM::R6, RegState::Kill)
.addImm(MaxAlign-1)));
}
}
MI.eraseFromParent();