https://llvm.org/bugs/show_bug.cgi?id=29037
Bug ID: 29037
Summary: LLC: Frame Pointer Elim. optimization causes a stack
crash on Sandybridge.
Product: tools
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: llc
Assignee: unassignedb...@nondot.org
Reporter: shishpanov2...@yandex.ru
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 16986
--> https://llvm.org/bugs/attachment.cgi?id=16986&action=edit
Source IR
Launch commands:
llc -mcpu=sandybridge input.ll -o output.asm -O1 ;
clang++ test_static.cpp output.asm -o output.run ;
./output.run
If I run LLC with -O0 instead of -O1 or run it with -disable-fp-elim, the
function f_fu() works properly. If I run it with -O1, I have seg. fault.
As I can see, the problem is in the last VPEXTRD instruction in f_fu(), which
overrides and damages the pointer's value for the final result on the stack. In
addition, if I skip " TFI.orderFrameObjects(Fn, ObjectsToAllocate);" in
lib/CodeGen/PrologEpilogInserter.cpp:calculateFrameObjectOffsets(MachineFunction
&Fn) with -O1 only, then it works.
LLVM rev. 277592.
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