[llvm-bugs] [Bug 47381] New: Assertion `(LocalChanged || (RefHash == StructuralHash(F))) && "Pass modifies its input and doesn't report it."' for -indvars pass

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47381

            Bug ID: 47381
           Summary: Assertion `(LocalChanged || (RefHash ==
                    StructuralHash(F))) && "Pass modifies its input and
                    doesn't report it."' for -indvars pass
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Loop Optimizer
          Assignee: unassignedbugs at nondot.org
          Reporter: mikael.holmen at ericsson.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 23911
  --> https://bugs.llvm.org/attachment.cgi?id=23911&action=edit
reproducer

opt needs to be compiled with EXPENSIVE_CHECKS.

Reproduce with:
 opt -S -indvars < eliminate-overflow-intrinsic-changed.ll

Result:

Pass modifies its input and doesn't report it: Induction Variable
Simplification
Pass modifies its input and doesn't report it
UNREACHABLE executed at ../lib/Analysis/LoopPass.cpp:204!
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash
backtrace.

The call to
 @llvm.ssub.with.overflow.i32
is changed to a
 sub nsw
but the change is not reported.

The change is done by
 SimplifyIndvar::eliminateOverflowIntrinsic

-- 
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/20200901/68bffab2/attachment.html>