[Bug tree-optimization/56321] [4.8 Regression] ICE:segfault in midend for -funsafe-math-optimizations -O3

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56321

--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> 2013-02-15 09:43:36 UTC ---
(In reply to comment #7)
> I see.  The problem is a memory VUSE on the return statement that no longer has
> a def.  The VDEF was associated with the __builtin_pow statement that was
> expanded.  Looks like I need to release the SSA name.  Working on a fix.

Use unlink_stmt_vdef when removing a stmt that possibly has a VDEF.