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In 32-bit mode, mark 64-bit GPR's as unallocatable. 

llvm-svn: 48217
This commit is contained in:
Evan Cheng 2008-03-11 07:16:00 +00:00
parent 756f9d9c51
commit 5b59e372dc
1 changed files with 3 additions and 0 deletions
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3
llvm/lib/Target/X86/X86RegisterInfo.td
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@ -415,6 +415,9 @@ def GR64 : RegisterClass<"X86", [i64], 64,
GR64Class::allocation_order_end(const MachineFunction &MF) const {
const TargetMachine &TM = MF.getTarget();
const TargetRegisterInfo *RI = TM.getRegisterInfo();
const X86Subtarget &Subtarget = TM.getSubtarget<X86Subtarget>();
if (!Subtarget.is64Bit())
return begin(); // None of these are allocatable in 32-bit.
if (RI->hasFP(MF)) // Does the function dedicate RBP to being a frame ptr?
return end()-2; // If so, don't allocate RSP or RBP
else