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Blackfin always uses a reserved call frame.

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Materializing the stack pointer update before a call requires a scratch
register that may not be available.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132601 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-06-03 22:45:18 +00:00
parent ec281c8934
commit 7b5fdc7fbd
3 changed files with 7 additions and 2 deletions
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6
lib/Target/Blackfin/BlackfinFrameLowering.cpp
View File

@ -31,6 +31,12 @@ bool BlackfinFrameLowering::hasFP(const MachineFunction &MF) const {
MFI->adjustsStack() || MFI->hasVarSizedObjects();
}
// Always reserve a call frame. We dont have enough registers to adjust SP.
bool BlackfinFrameLowering::
hasReservedCallFrame(const MachineFunction &MF) const {
return true;
}
// Emit a prologue that sets up a stack frame.
// On function entry, R0-R2 and P0 may hold arguments.
// R3, P1, and P2 may be used as scratch registers

1
lib/Target/Blackfin/BlackfinFrameLowering.h
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@ -36,6 +36,7 @@ public:
void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
bool hasFP(const MachineFunction &MF) const;
bool hasReservedCallFrame(const MachineFunction &MF) const;
void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
RegScavenger *RS) const;

2
lib/Target/Blackfin/BlackfinRegisterInfo.h
View File

@ -41,8 +41,6 @@ namespace llvm {
return &BF::PRegClass;
}
// bool hasReservedCallFrame(MachineFunction &MF) const;
bool requiresRegisterScavenging(const MachineFunction &MF) const;
void eliminateCallFramePseudoInstr(MachineFunction &MF,