Hi,
The patch didn't handled the case for dt being vect_constant_def,
where of course the reduc_def_stmt is NULL.
By checking for NULL before testing for PHI, we now fallback for such
cases to old behavior and return in the next if-statment.
2015-02-25 Richard Biener <rguent...@suse.de>
Kai Tietz <kti...@redhat.com>
PR tree-optimization/61917
* tree-vect-loop.c (vectorizable_reduction): Handle obvious case
that reduc_def_stmt is null.
Tested and will apply as obvious to trunk and 4.9 if there are no objections.
Sorry for the noise.
Kai
Index: tree-vect-loop.c
===================================================================
--- tree-vect-loop.c (Revision 220968)
+++ tree-vect-loop.c (Arbeitskopie)
@@ -4912,7 +4912,7 @@ vectorizable_reduction (gimple stmt, gimple_stmt_i
if (!found_nested_cycle_def)
reduc_def_stmt = def_stmt;
- if (gimple_code (reduc_def_stmt) != GIMPLE_PHI)
+ if (reduc_def_stmt && gimple_code (reduc_def_stmt) != GIMPLE_PHI)
return false;
if (!(dt == vect_reduction_def
