[Bug tree-optimization/43107] [4.5 Regression] ICE: SIGSEGV with -O3 -mavx

[jakub at gcc dot gnu dot org]

------- Comment #3 from jakub at gcc dot gnu dot org  2010-02-17 22:17 -------
The
@@ -24597,7 +24610,7 @@ avx_vpermilp_parallel (rtx par, enum machine_mode mode)
       if (!CONST_INT_P (er))
        return 0;
       ei = INTVAL (er);
-      if (ei >= nelt)
+      if (ei >= 2 * nelt)
        return 0;
       ipar[i] = ei;
     }
hunk in
http://gcc.gnu.org/ml/gcc-patches/2009-11/msg01730.html
seems to be the culprit.  I can't see how allowing values nelt or larger can be
correct, e.g. the mask returned by it is certainly wrong in that case.


-- 

jakub at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rth at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43107