[Bug target/52607] v4df __builtin_shuffle with {0,2,1,3} or {1,3,0,2}

[rth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52607

--- Comment #11 from Richard Henderson <rth at gcc dot gnu.org> 2012-03-19 
19:36:03 UTC ---
The vselect patch looks pretty good.

+  if (icode >= 0 && !testing_p)
+    x = copy_rtx (PATTERN (vselect_insn));
...
+  if (!testing_p)
+    emit_insn (x);

could be merged for clarity.

The patch in comment #8 looks plausible.  It could
stand to have some comments added though.