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AArch64: remove unnecessary check that RS is valid 

AArch64 always demands a register-scavenger, so the pointer should never be
NULL. However, in the spirit of paranoia, we'll assert it before use just in
case.

llvm-svn: 180080
This commit is contained in:
Tim Northover 2013-04-23 06:55:15 +00:00
parent 535ab8601f
commit 2ac2d4c59d
1 changed files with 3 additions and 2 deletions
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5
llvm/lib/Target/AArch64/AArch64FrameLowering.cpp
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@ -367,9 +367,8 @@ AArch64FrameLowering::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
// shoving a base register and an offset into the instruction then we may well
// need to scavenge registers. We should either specifically add an
// callee-save register for this purpose or allocate an extra spill slot.
bool BigStack =
(RS && MFI->estimateStackSize(MF) >= TII.estimateRSStackLimit(MF))
MFI->estimateStackSize(MF) >= TII.estimateRSStackLimit(MF)
|| MFI->hasVarSizedObjects() // Access will be from X29: messes things up
|| (MFI->adjustsStack() && !hasReservedCallFrame(MF));
@ -392,6 +391,8 @@ AArch64FrameLowering::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
if (ExtraReg != 0) {
MF.getRegInfo().setPhysRegUsed(ExtraReg);
} else {
assert(RS && "Expect register scavenger to be available");
// Create a stack slot for scavenging purposes. PrologEpilogInserter
// helpfully places it near either SP or FP for us to avoid
// infinitely-regression during scavenging.