[llvm-bugs] [Bug 25440] New: assertion in GVN

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25440

            Bug ID: 25440
           Summary: assertion in GVN
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: weimingz at codeaurora.org
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 15240
  --> https://llvm.org/bugs/attachment.cgi?id=15240&action=edit
reduced test case

on tip r252395, GVN hits an assertion:

lib/Transforms/Scalar/GVN.cpp:467: uint32_t
<anonymousnamespace>::ValueTable::lookup(llvm::Value *) const: Assertion `VI !=
valueNumbering.end() && "Value not numbered?"' failed.


To reproduce:
opt -gvn -S bugpoint-reduced-simplified.ll


The reason it hits the assertion is when it coerced the two loads:
  %0 = load i16, i16* %code1, align 4
  %bf.load = load i16, i16* %mode, align 2

it inserts some truncs/zext insts and they don't have GVN assigned.

-- 
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20151107/5c95ab3b/attachment.html>