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Fix stack alignment in functions with varargs.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34532 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lauro Ramos Venancio 2007-02-23 20:32:57 +00:00
parent cae0a193e3
commit 600c383e5c
2 changed files with 25 additions and 2 deletions
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7
lib/Target/ARM/ARMISelLowering.cpp
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@ -831,13 +831,16 @@ ARMTargetLowering::LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG) {
SSARegMap *RegMap = MF.getSSARegMap();
MachineFrameInfo *MFI = MF.getFrameInfo();
ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
unsigned VARegSaveSize = (4 - NumGPRs) * 4;
unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
unsigned VARegSize = (4 - NumGPRs) * 4;
unsigned VARegSaveSize = (VARegSize + Align - 1) & ~(Align - 1);
if (VARegSaveSize) {
// If this function is vararg, store any remaining integer argument regs
// to their spots on the stack so that they may be loaded by deferencing
// the result of va_next.
AFI->setVarArgsRegSaveSize(VARegSaveSize);
VarArgsFrameIndex = MFI->CreateFixedObject(VARegSaveSize, ArgOffset);
VarArgsFrameIndex = MFI->CreateFixedObject(VARegSaveSize, ArgOffset +
VARegSaveSize - VARegSize);
SDOperand FIN = DAG.getFrameIndex(VarArgsFrameIndex, getPointerTy());
SmallVector<SDOperand, 4> MemOps;

20
test/CodeGen/ARM/vargs_align.ll Normal file
View File

@ -0,0 +1,20 @@
; RUN: llvm-as < %s | llc -march=arm &&
; RUN: llvm-as < %s | llc -march=arm -mtriple=arm-linux-gnueabi -disable-fp-elim | grep "add sp, sp, #16" &&
; RUN: llvm-as < %s | llc -march=arm -mtriple=arm-linux-gnu -disable-fp-elim | grep "add sp, sp, #12"
define i32 @f(i32 %a, ...) {
entry:
%a_addr = alloca i32 ; <i32*> [#uses=1]
%retval = alloca i32, align 4 ; <i32*> [#uses=2]
%tmp = alloca i32, align 4 ; <i32*> [#uses=2]
"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
store i32 %a, i32* %a_addr
store i32 0, i32* %tmp
%tmp1 = load i32* %tmp ; <i32> [#uses=1]
store i32 %tmp1, i32* %retval
br label %return
return: ; preds = %entry
%retval2 = load i32* %retval ; <i32> [#uses=1]
ret i32 %retval2
}