[gcc r17-3137] tree-optimization/110935 - add testcase

https://gcc.gnu.org/g:1fb622222606c1ef960d3fff0b420bb8e7473cff

commit r17-3137-g1fb622222606c1ef960d3fff0b420bb8e7473cff
Author: Richard Biener <[email protected]>
Date:   Fri Aug 7 15:11:15 2026 +0200

    tree-optimization/110935 - add testcase
    
    The issue in the bug was fixed for GCC 16, this adds a testcase.
    
            PR tree-optimization/110935
            * gcc.dg/vect/bb-slp-reduc-pr110935.c: New testcase.

Diff:
---
 gcc/testsuite/gcc.dg/vect/bb-slp-reduc-pr110935.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/gcc/testsuite/gcc.dg/vect/bb-slp-reduc-pr110935.c b/gcc/testsuite/gcc.dg/vect/bb-slp-reduc-pr110935.c
new file mode 100644
index 000000000000..88243d40c058
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/bb-slp-reduc-pr110935.c
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-ffast-math" } */
+
+double vals[16];
+double test ()
+{
+  vals[0]++;
+  return vals[2] + vals[4] + vals[1] + vals[3];
+}
+
+/* { dg-final { scan-tree-dump "optimized: basic block part vectorized" "slp2" { target { vect_double && vect_hw_misalign } } } } */