diff options
| author | Bill Schmidt <wschmidt@linux.vnet.ibm.com> | 2013-02-26 21:28:57 +0000 |
|---|---|---|
| committer | Bill Schmidt <wschmidt@linux.vnet.ibm.com> | 2013-02-26 21:28:57 +0000 |
| commit | 65396823305326bcb379e88a95ded318e1da875c (patch) | |
| tree | dc9f94c2ce1e31ba6eb405eddd938ca391874d9f /lib/Target/PowerPC/PPCFrameLowering.cpp | |
| parent | 7375f4f98148fc34f0c7fc765967501cdc65b24e (diff) | |
Fix PR15332 (patch by Florian Zeitz).
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
Diffstat (limited to 'lib/Target/PowerPC/PPCFrameLowering.cpp')
| -rw-r--r-- | lib/Target/PowerPC/PPCFrameLowering.cpp | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/lib/Target/PowerPC/PPCFrameLowering.cpp b/lib/Target/PowerPC/PPCFrameLowering.cpp index 6dfb4c8d774..0a396e6693f 100644 --- a/lib/Target/PowerPC/PPCFrameLowering.cpp +++ b/lib/Target/PowerPC/PPCFrameLowering.cpp @@ -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. |