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This should have gone in with 26015, see comments there.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96020 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen 2010-02-12 22:00:40 +00:00
parent 83498e55e2
commit ee25bc2942
1 changed files with 12 additions and 0 deletions
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12
lib/Target/PowerPC/PPCRegisterInfo.cpp
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@ -427,6 +427,12 @@ BitVector PPCRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
Reserved.set(PPC::R2); // System-reserved register
Reserved.set(PPC::R13); // Small Data Area pointer register
}
// Reserve R2 on Darwin to hack around the problem of save/restore of CR
// when the stack frame is too big to address directly; we need two regs.
// This is a hack.
if (Subtarget.isDarwinABI()) {
Reserved.set(PPC::R2);
}
// On PPC64, r13 is the thread pointer. Never allocate this register.
// Note that this is over conservative, as it also prevents allocation of R31
@ -447,6 +453,12 @@ BitVector PPCRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
if (Subtarget.isSVR4ABI()) {
Reserved.set(PPC::X2);
}
// Reserve R2 on Darwin to hack around the problem of save/restore of CR
// when the stack frame is too big to address directly; we need two regs.
// This is a hack.
if (Subtarget.isDarwinABI()) {
Reserved.set(PPC::X2);
}
}
if (needsFP(MF))