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Spill R4 if it's going to be used to restore SP from FP.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123567 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2011-01-16 05:14:33 +00:00
parent 9922ccf4b4
commit df55fea807
2 changed files with 29 additions and 4 deletions
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16
lib/Target/ARM/ARMFrameLowering.cpp
View File

@ -801,15 +801,23 @@ ARMFrameLowering::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
// Spill R4 if Thumb2 function requires stack realignment - it will be used as
// scratch register. Also spill R4 if Thumb2 function has varsized objects,
// since it's always posible to restore sp from fp in a single instruction.
// since it's not always possible to restore sp from fp in a single
// instruction.
// FIXME: It will be better just to find spare register here.
if (AFI->isThumb2Function() &&
(MFI->hasVarSizedObjects() || RegInfo->needsStackRealignment(MF)))
MF.getRegInfo().setPhysRegUsed(ARM::R4);
// Spill LR if Thumb1 function uses variable length argument lists.
if (AFI->isThumb1OnlyFunction() && AFI->getVarArgsRegSaveSize() > 0)
MF.getRegInfo().setPhysRegUsed(ARM::LR);
if (AFI->isThumb1OnlyFunction()) {
// Spill LR if Thumb1 function uses variable length argument lists.
if (AFI->getVarArgsRegSaveSize() > 0)
MF.getRegInfo().setPhysRegUsed(ARM::LR);
// Spill R4 if Thumb1 epilogue has to restore SP from FP since
// FIXME: It will be better just to find spare register here.
if (MFI->hasVarSizedObjects())
MF.getRegInfo().setPhysRegUsed(ARM::R4);
}
// Spill the BasePtr if it's used.
if (RegInfo->hasBasePointer(MF))

17
test/CodeGen/Thumb/2011-EpilogueBug.ll Normal file
View File

@ -0,0 +1,17 @@
; RUN: llc -mtriple=thumbv6-apple-darwin < %s | FileCheck %s
; r8869722
%struct.state = type { i32, %struct.info*, float**, i32, i32, i32, i32, i32, i32, i32, i32, i32, i64, i64, i64, i64, i64, i64, i8* }
%struct.info = type { i32, i32, i32, i32, i32, i32, i32, i8* }
define void @t1(%struct.state* %v) {
; CHECK: push {r4
%tmp6 = load i32* null
%tmp8 = alloca float, i32 %tmp6
store i32 1, i32* null
br label %return
return: ; preds = %0
; CHECK: mov sp, r4
ret void
}