http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49926
--- Comment #3 from Ira Rosen <irar at il dot ibm.com> 2011-08-01 15:14:50 UTC
---
I am testing this patch:
Index: tree-vect-loop.c
===================================================================
--- tree-vect-loop.c (revision 177007)
+++ tree-vect-loop.c (working copy)
@@ -1730,7 +1730,7 @@
tree lhs;
imm_use_iterator imm_iter;
use_operand_p use_p;
- int nloop_uses, size = 0;
+ int nloop_uses, size = 0, n_out_of_loop_uses;
bool found = false;
if (loop != vect_loop)
@@ -1741,6 +1741,7 @@
while (1)
{
nloop_uses = 0;
+ n_out_of_loop_uses = 0;
FOR_EACH_IMM_USE_FAST (use_p, imm_iter, lhs)
{
gimple use_stmt = USE_STMT (use_p);
@@ -1757,16 +1758,22 @@
break;
}
- if (flow_bb_inside_loop_p (loop, gimple_bb (use_stmt))
- && vinfo_for_stmt (use_stmt)
- && !STMT_VINFO_IN_PATTERN_P (vinfo_for_stmt (use_stmt)))
- {
- loop_use_stmt = use_stmt;
- nloop_uses++;
- }
+ if (flow_bb_inside_loop_p (loop, gimple_bb (use_stmt)))
+ {
+ if (vinfo_for_stmt (use_stmt)
+ && !STMT_VINFO_IN_PATTERN_P (vinfo_for_stmt (use_stmt)))
+ {
+ loop_use_stmt = use_stmt;
+ nloop_uses++;
+ }
+ }
+ else
+ n_out_of_loop_uses++;
- if (nloop_uses > 1)
- return false;
+ /* There are can be either a single use in the loop or two uses in
+ phi nodes. */
+ if (nloop_uses > 1 || (n_out_of_loop_uses && nloop_uses))
+ return false;
}
if (found)
