https://llvm.org/bugs/show_bug.cgi?id=26992
Bug ID: 26992
Summary: instcombine attempts to insert in catchswitch
Product: new-bugs
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: andrew.kay...@intel.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 16051
--> https://llvm.org/bugs/attachment.cgi?id=16051&action=edit
Small reproducer
There is a scenario where instcombine will attempt to insert a rewritten GEP
instruction for a compare into a catchswitch block below the catchswitch
instruction.
I came across this in a program that was using the basic_istream template from
an MSVC header, but I have reduced the failure to the attached IR file.
The bad insertion is happening within the rewriteGEPAsOffset() function in
InstCombineCompares.cpp.
It looks like this problem was introduced with r257897.
I am able to reproduce the failure with the following command line:
opt -instcombine -S instcombine-badinsert.ll
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