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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
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@ -207,13 +207,14 @@ void PPCFrameLowering::determineFrameLayout(MachineFunction &MF) const {
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// to adjust the stack pointer (we fit in the Red Zone). For 64-bit
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// to adjust the stack pointer (we fit in the Red Zone). For 64-bit
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// SVR4, we also require a stack frame if we need to spill the CR,
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// SVR4, we also require a stack frame if we need to spill the CR,
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// since this spill area is addressed relative to the stack pointer.
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// since this spill area is addressed relative to the stack pointer.
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// The 32-bit SVR4 ABI has no Red Zone. However, it can still generate
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// stackless code if all local vars are reg-allocated.
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bool DisableRedZone = MF.getFunction()->getAttributes().
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bool DisableRedZone = MF.getFunction()->getAttributes().
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hasAttribute(AttributeSet::FunctionIndex, Attribute::NoRedZone);
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hasAttribute(AttributeSet::FunctionIndex, Attribute::NoRedZone);
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// FIXME SVR4 The 32-bit SVR4 ABI has no red zone. However, it can
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// still generate stackless code if all local vars are reg-allocated.
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// Try: (FrameSize <= 224
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// || (FrameSize == 0 && Subtarget.isPPC32 && Subtarget.isSVR4ABI()))
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if (!DisableRedZone &&
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if (!DisableRedZone &&
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(Subtarget.isPPC64() || // 32-bit SVR4, no stack-
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!Subtarget.isSVR4ABI() || // allocated locals.
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FrameSize == 0) &&
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FrameSize <= 224 && // Fits in red zone.
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FrameSize <= 224 && // Fits in red zone.
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!MFI->hasVarSizedObjects() && // No dynamic alloca.
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!MFI->hasVarSizedObjects() && // No dynamic alloca.
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!MFI->adjustsStack() && // No calls.
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!MFI->adjustsStack() && // No calls.
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39
test/CodeGen/PowerPC/svr4-redzone.ll
Normal file
39
test/CodeGen/PowerPC/svr4-redzone.ll
Normal file
@ -0,0 +1,39 @@
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; RUN: llc -mtriple="powerpc-unknown-linux-gnu" < %s | FileCheck %s --check-prefix=PPC32
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; RUN: llc -mtriple="powerpc64-unknown-linux-gnu" < %s | FileCheck %s --check-prefix=PPC64
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; PR15332
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define void @regalloc() nounwind {
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entry:
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%0 = add i32 1, 2
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ret void
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}
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; PPC32: regalloc:
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; PPC32-NOT: stwu 1, -{{[0-9]+}}(1)
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; PPC32: blr
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; PPC64: regalloc:
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; PPC64-NOT: stdu 1, -{{[0-9]+}}(1)
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; PPC64: blr
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define void @smallstack() nounwind {
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entry:
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%0 = alloca i8, i32 4
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ret void
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}
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; PPC32: smallstack:
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; PPC32: stwu 1, -16(1)
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; PPC64: smallstack:
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; PPC64-NOT: stdu 1, -{{[0-9]+}}(1)
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; PPC64: blr
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define void @bigstack() nounwind {
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entry:
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%0 = alloca i8, i32 230
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ret void
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}
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; PPC32: bigstack:
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; PPC32: stwu 1, -240(1)
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; PPC64: bigstack:
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; PPC64: stdu 1, -352(1)
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