http://llvm.org/bugs/show_bug.cgi?id=17545
Bug ID: 17545
Summary: X86FrameLowering::getFrameIndexOffset generates wrong
offsets
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 11360
--> http://llvm.org/bugs/attachment.cgi?id=11360&action=edit
Source Of The Crash And Patch
int X86FrameLowering::getFrameIndexOffset(const MachineFunction &MF, int FI)
const {
const X86RegisterInfo *RegInfo =
static_cast<const X86RegisterInfo*>(MF.getTarget().getRegisterInfo());
const MachineFrameInfo *MFI = MF.getFrameInfo();
- int Offset = MFI->getObjectOffset(FI) - getOffsetOfLocalArea();
+ int Offset = MFI->getObjectOffset(FI);
The Offset have already been considered OffsetOfLocalArea once,in
PEI::calculateFrameObjectOffsets.So subtract it back here make the offset
smaller than expected.
The file uploaded is the ll source cause a crash and a patch fixing this bug.
Crash cause:
The SkMatrix object is in [SP-60],but [SP-64] is what we expecting.This stack
object is align to 16 bytes.
%mat = alloca %class.SkMatrix, align 16
So the vmovaps inst will cause a gp exception when accessing unaligned stack
address.
the compile command is
llc -O2 -o crashx86.s crashx86.ll
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