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This fixes functions like

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void f (int a1, int a2, int a3, int a4, int a5,...)

In ARMTargetLowering::LowerFormalArguments if the function has 4 or
more regular arguments we used to set VarArgsFrameIndex using an
offset of 0, which is only correct if the function has exactly 4
regular arguments.

llvm-svn: 85590
This commit is contained in:
Rafael Espindola 2009-10-30 14:33:14 +00:00
parent 8072b6dafe
commit d4fadd76da
2 changed files with 18 additions and 2 deletions
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3
lib/Target/ARM/ARMISelLowering.cpp
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@ -1629,13 +1629,12 @@ ARMTargetLowering::LowerFormalArguments(SDValue Chain,
unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
unsigned VARegSize = (4 - NumGPRs) * 4;
unsigned VARegSaveSize = (VARegSize + Align - 1) & ~(Align - 1);
unsigned ArgOffset = 0;
unsigned ArgOffset = CCInfo.getNextStackOffset();
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);
ArgOffset = CCInfo.getNextStackOffset();
VarArgsFrameIndex = MFI->CreateFixedObject(VARegSaveSize, ArgOffset +
VARegSaveSize - VARegSize);
SDValue FIN = DAG.getFrameIndex(VarArgsFrameIndex, getPointerTy());

17
test/CodeGen/ARM/2009-10-30.ll Normal file
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@ -0,0 +1,17 @@
; RUN: llc < %s -mtriple=arm-linux-gnueabi | FileCheck %s
; This test checks that the address of the varg arguments is correctly
; computed when there are 5 or more regular arguments.
define void @f(i32 %a1, i32 %a2, i32 %a3, i32 %a4, i32 %a5, ...) {
entry:
;CHECK: sub sp, sp, #4
;CHECK: add r0, sp, #8
;CHECK: str r0, [sp], #+4
;CHECK: bx lr
%ap = alloca i8*, align 4
%ap1 = bitcast i8** %ap to i8*
call void @llvm.va_start(i8* %ap1)
ret void
}
declare void @llvm.va_start(i8*) nounwind