There exists no .REDUC_PLUS on s390.
gcc/testsuite/ChangeLog:
* gcc.dg/vect/bb-slp-77.c: Skip on s390.
*s = sumf;
}
-/* { dg-final { scan-tree-dump-times "optimized: basic block" 1 "slp1" { target { { vect_int_mult && vect_element_align } && { ! { powerpc*-*-* x86_64-*-* i?86-*-* loongarch*-*-* } } } } } } */
+/* { dg-final { scan-tree-dump-times "optimized: basic block" 1 "slp1" { target { { vect_int_mult && vect_element_align } && { ! { powerpc*-*-* x86_64-*-* i?86-*-* loongarch*-*-* s390*-*-* } } } } } } */