[LLVMbugs] [Bug 15570] SEGV: SCEV back-edge info invalid after dead code removal.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=15570

Andrew Trick <atrick at apple.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
           Assignee|unassignedbugs at nondot.org   |atrick at apple.com

--- Comment #6 from Andrew Trick <atrick at apple.com> ---
trunk at 177986

Fix SCEV forgetMemoizedResults should search and destroy backedge exprs.

    Indvars creates a SCEV expression for the loop's back edge taken
    count, then determines that the comparison is always true and
    removes it.

    When loop-unroll asks for the expression, it contains a NULL
    SCEVUnknkown (as a CallbackVH).

    forgetMemoizedResults should invalidate the loop back edges expression.

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