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[Sparc] Implements hasReservedCallFrame and hasFP.

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This is to generate correct framesetup code when the function
 has variable sized allocas.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182108 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Venkatraman Govindaraju 2013-05-17 15:14:34 +00:00
parent a0de26ce34
commit a65d33760b
3 changed files with 33 additions and 1 deletions
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15
lib/Target/Sparc/SparcFrameLowering.cpp
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@ -106,3 +106,18 @@ void SparcFrameLowering::emitEpilogue(MachineFunction &MF,
BuildMI(MBB, MBBI, dl, TII.get(SP::RESTORErr), SP::G0).addReg(SP::G0)
.addReg(SP::G0);
}
bool SparcFrameLowering::hasReservedCallFrame(const MachineFunction &MF) const {
//Reserve call frame if there are no variable sized objects on the stack
return !MF.getFrameInfo()->hasVarSizedObjects();
}
// hasFP - Return true if the specified function should have a dedicated frame
// pointer register. This is true if the function has variable sized allocas or
// if frame pointer elimination is disabled.
bool SparcFrameLowering::hasFP(const MachineFunction &MF) const {
const MachineFrameInfo *MFI = MF.getFrameInfo();
return MF.getTarget().Options.DisableFramePointerElim(MF) ||
MFI->hasVarSizedObjects() || MFI->isFrameAddressTaken();
}

3
lib/Target/Sparc/SparcFrameLowering.h
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@ -38,7 +38,8 @@ public:
MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const;
bool hasFP(const MachineFunction &MF) const { return false; }
bool hasReservedCallFrame(const MachineFunction &MF) const;
bool hasFP(const MachineFunction &MF) const;
};
} // End llvm namespace

16
test/CodeGen/SPARC/2013-05-17-CallFrame.ll Normal file
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@ -0,0 +1,16 @@
; RUN: llc -march=sparc < %s | FileCheck %s
; CHECK: variable_alloca_with_adj_call_stack
; CHECK: save %sp, -96, %sp
; CHECK: add %sp, -16, %sp
; CHECK: call foo
; CHECK: add %sp, 16, %sp
define void @variable_alloca_with_adj_call_stack(i32 %num) {
entry:
%0 = alloca i8, i32 %num, align 8
call void @foo(i8* %0, i8* %0, i8* %0, i8* %0, i8* %0, i8* %0, i8* %0, i8* %0, i8* %0, i8* %0)
ret void
}
declare void @foo(i8* , i8*, i8*, i8*, i8*, i8*, i8*, i8*, i8*, i8*);