[llvm-bugs] [Bug 30454] New: Assertion `InLCSSA && "LCSSA is broken after loop-simplify."' failed.

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30454

            Bug ID: 30454
           Summary: Assertion `InLCSSA && "LCSSA is broken after
                    loop-simplify."' failed.
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: mikael.holmen at ericsson.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 17315
  --> https://llvm.org/bugs/attachment.cgi?id=17315&action=edit
Reproducer

The original C-code was generated by csmith, and then it's been reduced
heavily.

opt -S -lcssa -licm red.ll

hits:

opt: ../lib/Transforms/Utils/LoopSimplify.cpp:825: virtual bool (anonymous
namespace)::LoopSimplify::runOnFunction(llvm::Function &): Assertion `InLCSSA
&& "LCSSA is broken after loop-simplify."' failed.

Note the block

if.end1070:                                       ; No predecessors!
 br i1 undef, label %for.end1146, label %if.end1074

Noone jumps to it, and if I remove it, the program compiles instead of hitting
the assert.

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