tree-optimization/108816 - vect versioning check split confusion
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Commit Message
The split of the versioning condition assumes the definition is
in the condition block which is ensured by the versioning code.
But that only works when we actually have to insert any statements
for the versioning condition. The following adjusts the guard
accordingly and asserts this condition.
Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.
PR tree-optimization/108816
* tree-vect-loop-manip.cc (vect_loop_versioning): Adjust
versioning condition split prerequesite, assert required
invariant.
* gcc.dg/torture/pr108816.c: New testcase.
---
gcc/testsuite/gcc.dg/torture/pr108816.c | 18 ++++++++++++++++++
gcc/tree-vect-loop-manip.cc | 3 ++-
2 files changed, 20 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/gcc.dg/torture/pr108816.c
new file mode 100644
@@ -0,0 +1,18 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-fvect-cost-model=dynamic" } */
+
+int m;
+
+void
+foo (int p[][16], unsigned int x)
+{
+ while (x < 4)
+ {
+ int j;
+
+ for (j = x * 4; j < (x + 1) * 4 - 2; j++)
+ p[0][j] = p[m][j];
+
+ ++x;
+ }
+}
@@ -3477,7 +3477,7 @@ vect_loop_versioning (loop_vec_info loop_vinfo,
tree cost_name = NULL_TREE;
profile_probability prob2 = profile_probability::uninitialized ();
if (cond_expr
- && !integer_truep (cond_expr)
+ && EXPR_P (cond_expr)
&& (version_niter
|| version_align
|| version_alias
@@ -3711,6 +3711,7 @@ vect_loop_versioning (loop_vec_info loop_vinfo,
if (cost_name && TREE_CODE (cost_name) == SSA_NAME)
{
gimple *def = SSA_NAME_DEF_STMT (cost_name);
+ gcc_assert (gimple_bb (def) == condition_bb);
/* All uses of the cost check are 'true' after the check we
are going to insert. */
replace_uses_by (cost_name, boolean_true_node);