Hi,
As Lyon pointed out, the newly introduced test case
gcc.dg/tree-ssa/pr96789.c fails on arm-none-linux-gnueabihf.
Loop vectorizer is able to vectorize the two loops which
operate on array tmp with load_lanes feature support. It
makes dse3 get unexpected inputs and do nothing.
This patch is to teach the case to respect vect_load_lanes,
meanwhile to guard the check only under vect_int.
Is it ok for trunk?
BR,
Kewen
-----
gcc/testsuite/ChangeLog:
* gcc.dg/tree-ssa/pr96789.c: Adjusted by excluding vect_load_lanes.
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr96789.c
b/gcc/testsuite/gcc.dg/tree-ssa/pr96789.c
index d6139a014d8..1b89f8b7a6a 100644
--- a/gcc/testsuite/gcc.dg/tree-ssa/pr96789.c
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr96789.c
@@ -55,4 +55,7 @@ bar (int16_t res[16], uint8_t *val1, uint8_t *val2)
}
}
-/* { dg-final { scan-tree-dump {Deleted dead store:.*tmp} "dse3" } } */
+/* Exclude targets which support load_lanes since loop vectorizer
+ can vectorize those two loops that operate tmp array so that
+ subsequent dse3 will not eliminate tmp stores. */
+/* { dg-final { scan-tree-dump {Deleted dead store:.*tmp} "dse3" { target {
vect_int && { ! vect_load_lanes } } } } } */
