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Fix PR15332 (patch by Florian Zeitz).

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There's no need to generate a stack frame for PPC32 SVR4 when there are
no local variables assigned to the stack, i.e., when no red zone is needed.
(PPC64 supports a red zone, but PPC32 does not.)



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176124 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Schmidt
2013-02-26 21:28:57 +00:00
parent 7375f4f981
commit 6539682330
2 changed files with 44 additions and 4 deletions
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9
lib/Target/PowerPC/PPCFrameLowering.cpp
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@ -207,13 +207,14 @@ void PPCFrameLowering::determineFrameLayout(MachineFunction &MF) const {
// to adjust the stack pointer (we fit in the Red Zone). For 64-bit
// SVR4, we also require a stack frame if we need to spill the CR,
// since this spill area is addressed relative to the stack pointer.
// The 32-bit SVR4 ABI has no Red Zone. However, it can still generate
// stackless code if all local vars are reg-allocated.
bool DisableRedZone = MF.getFunction()->getAttributes().
hasAttribute(AttributeSet::FunctionIndex, Attribute::NoRedZone);
// FIXME SVR4 The 32-bit SVR4 ABI has no red zone. However, it can
// still generate stackless code if all local vars are reg-allocated.
// Try: (FrameSize <= 224
// || (FrameSize == 0 && Subtarget.isPPC32 && Subtarget.isSVR4ABI()))
if (!DisableRedZone &&
(Subtarget.isPPC64() || // 32-bit SVR4, no stack-
!Subtarget.isSVR4ABI() || // allocated locals.
FrameSize == 0) &&
FrameSize <= 224 && // Fits in red zone.
!MFI->hasVarSizedObjects() && // No dynamic alloca.
!MFI->adjustsStack() && // No calls.