Fix static array size in gcc.dg/vect/vect-simd-20.c
    
    10000 / 78 is a strictly greater than 128 so we will
    actually do 128+1 strides in foo() for s == 78 and p[]
    needs to be dimensioned accordingly.
    
    2021-11-02  Olivier Hainque  <hainque@adacore.com>
    
            * gcc.dg/vect/vect-simd-20.c: Fix size of p[]
            to accommodate the number of strides performed
            by foo() for s == 78.

diff --git a/gcc/testsuite/gcc.dg/vect/vect-simd-20.c b/gcc/testsuite/gcc.dg/vect/vect-simd-20.c
index c85f05f61c6..8d8d8378484 100644
--- a/gcc/testsuite/gcc.dg/vect/vect-simd-20.c
+++ b/gcc/testsuite/gcc.dg/vect/vect-simd-20.c
@@ -18,7 +18,10 @@ foo (int s, int m, int n, int *p)
   return r;
 }
 
-int p[10000 / 78 * 7];
+/* Dimension this static array in accordance with the maximum number
+   of inner strides we might do in foo().  This will be for s == 78,
+   and 10000 % 78 > 0.  */
+int p[((10000 / 78) + 1) * 7];
 
 int
 main ()