Richard Sandiford <richard.sandif...@arm.com> writes:
> The series to remove vinfo_for_stmt also removed tests of
> flow_bb_inside_loop_p if the call was simply testing whether the
> statement was in the vectorisation region. I'd tried to keep calls
> that were testing whether the statement was in a particular loop
> (inner or outer), but messed up in vect_is_simple_reduction and
> removed calls that were actually needed. This patch restores them.
>
> I double-checked the other removed calls and I think these are
> the only ones affected.
>
> Tested on aarch64-linux-gnu (with and without SVE), aarch64_be-elf and
> x86_64-linux-gnu. Applied as obvious, on the basis that it's simply
> reverting part of my own patch.
>
> Richard
>
>
> 2018-08-08 Richard Sandiford <richard.sandif...@arm.com>
>
> gcc/
> PR tree-optimization/86858
> * tree-vect-loop.c (vect_is_simple_reduction): Restore
> flow_bb_inside_loop_p calls.
>
> gcc/testsuite/
> PR tree-optimization/86858
> * gcc.dg/vect/pr86858.c: New test.
Sorry, patch was:
Index: gcc/tree-vect-loop.c
===================================================================
--- gcc/tree-vect-loop.c 2018-08-09 15:38:35.230258362 +0100
+++ gcc/tree-vect-loop.c 2018-08-09 15:41:10.672888995 +0100
@@ -2922,7 +2922,8 @@ vect_is_simple_reduction (loop_vec_info
}
stmt_vec_info def_stmt_info = loop_info->lookup_def (loop_arg);
- if (!def_stmt_info)
+ if (!def_stmt_info
+ || !flow_bb_inside_loop_p (loop, gimple_bb (def_stmt_info->stmt)))
return NULL;
if (gassign *def_stmt = dyn_cast <gassign *> (def_stmt_info->stmt))
@@ -3161,6 +3162,7 @@ vect_is_simple_reduction (loop_vec_info
&& def2_info->stmt == phi
&& (code == COND_EXPR
|| !def1_info
+ || !flow_bb_inside_loop_p (loop, gimple_bb (def1_info->stmt))
|| vect_valid_reduction_input_p (def1_info)))
{
if (dump_enabled_p ())
@@ -3172,6 +3174,7 @@ vect_is_simple_reduction (loop_vec_info
&& def1_info->stmt == phi
&& (code == COND_EXPR
|| !def2_info
+ || !flow_bb_inside_loop_p (loop, gimple_bb (def2_info->stmt))
|| vect_valid_reduction_input_p (def2_info)))
{
if (! nested_in_vect_loop && orig_code != MINUS_EXPR)
Index: gcc/testsuite/gcc.dg/vect/pr86858.c
===================================================================
--- /dev/null 2018-07-26 10:26:13.137955424 +0100
+++ gcc/testsuite/gcc.dg/vect/pr86858.c 2018-08-09 15:41:10.672888995 +0100
@@ -0,0 +1,13 @@
+/* { dg-do compile } */
+
+int a, b, c, d;
+char e(char f, char g) { return f + g; }
+void h() {
+ for (; c; ++c) {
+ d = 0;
+ for (; d != 8; d = e(d, 3)) {
+ a = b && a;
+ b = c;
+ }
+ }
+}
