[gcc(refs/vendors/riscv/heads/gcc-13-with-riscv-opts)] test: Isolate slp-1.c check of target supports vect_strided5

[gcc(refs/vendors/riscv/heads/gcc-13-with-riscv-opts)] test: Isolate slp-1.c check of target supports vect_strided5

[Jeff Law]

https://gcc.gnu.org/g:760ccab75b67db0ab9ec9f837e38b2f11f2b478f

commit 760ccab75b67db0ab9ec9f837e38b2f11f2b478f
Author: Juzhe-Zhong <juzhe.zhong@rivai.ai>
Date:   Fri Sep 15 17:16:36 2023 +0800

    test: Isolate slp-1.c check of target supports vect_strided5
    
    This test failed in RISC-V:
    FAIL: gcc.dg/vect/slp-1.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorizing stmts using SLP" 4
    FAIL: gcc.dg/vect/slp-1.c scan-tree-dump-times vect "vectorizing stmts using SLP" 4
    
    Because this loop:
      /* SLP with unrolling by 8.  */
      for (i = 0; i < N; i++)
        {
          out[i*5] = 8;
          out[i*5 + 1] = 7;
          out[i*5 + 2] = 81;
          out[i*5 + 3] = 28;
          out[i*5 + 4] = 18;
        }
    
    is using vect_load_lanes with array size = 5.
    instead of SLP.
    
    When we adjust the COST of LANES load store, then it will use SLP.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.dg/vect/slp-1.c: Add vect_stried5.
    
    (cherry picked from commit 0854ebea63f59eb678ebf4440afe1d18ed5bb6d4)

Diff:
---
 gcc/testsuite/gcc.dg/vect/slp-1.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gcc/testsuite/gcc.dg/vect/slp-1.c b/gcc/testsuite/gcc.dg/vect/slp-1.c
index 26b71d65425..06e7381c23f 100644
--- a/gcc/testsuite/gcc.dg/vect/slp-1.c
+++ b/gcc/testsuite/gcc.dg/vect/slp-1.c
@@ -118,5 +118,5 @@ int main (void)
 }
 
 /* { dg-final { scan-tree-dump-times "vectorized 4 loops" 1 "vect"  } } */
-/* { dg-final { scan-tree-dump-times "vectorizing stmts using SLP" 4 "vect" } } */
-  
+/* { dg-final { scan-tree-dump-times "vectorizing stmts using SLP" 4 "vect" { target {! vect_strided5 } } } } */
+/* { dg-final { scan-tree-dump-times "vectorizing stmts using SLP" 3 "vect" { target vect_strided5 } } } */