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Leaf functions which do not save CSRs can be frameless even with -disable-fp-elim.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79039 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2009-08-14 20:48:13 +00:00
parent 9c546cd946
commit 98a0104014
3 changed files with 16 additions and 1 deletions
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9
lib/Target/ARM/ARMBaseRegisterInfo.cpp
View File

@ -440,6 +440,13 @@ bool ARMBaseRegisterInfo::hasFP(const MachineFunction &MF) const {
MFI->isFrameAddressTaken());
}
bool ARMBaseRegisterInfo::hasStackFrame(const MachineFunction &MF) const {
const MachineFrameInfo *MFI = MF.getFrameInfo();
if (NoFramePointerElim && MFI->hasCalls())
return true;
return MFI->hasVarSizedObjects() || MFI->isFrameAddressTaken();
}
/// estimateStackSize - Estimate and return the size of the frame.
static unsigned estimateStackSize(MachineFunction &MF, MachineFrameInfo *MFI) {
const MachineFrameInfo *FFI = MF.getFrameInfo();
@ -589,7 +596,7 @@ ARMBaseRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
}
bool ExtraCSSpill = false;
if (!CanEliminateFrame || hasFP(MF)) {
if (!CanEliminateFrame || hasStackFrame(MF)) {
AFI->setHasStackFrame(true);
// If LR is not spilled, but at least one of R4, R5, R6, and R7 is spilled.

2
lib/Target/ARM/ARMBaseRegisterInfo.h
View File

@ -89,6 +89,8 @@ public:
bool hasFP(const MachineFunction &MF) const;
bool hasStackFrame(const MachineFunction &MF) const;
void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
RegScavenger *RS = NULL) const;

6
test/CodeGen/Thumb2/frameless.ll Normal file
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@ -0,0 +1,6 @@
; RUN: llvm-as < %s | llc -mtriple=thumbv7-apple-darwin -disable-fp-elim | not grep mov
; RUN: llvm-as < %s | llc -mtriple=thumbv7-linux -disable-fp-elim | not grep mov
define arm_apcscc void @t() nounwind readnone {
ret void
}