[gcc r14-7084] RISC-V: Robostify dynamic lmul test

[Lehua Ding]

https://gcc.gnu.org/g:cf4dcf83a7df7805186aca7db0595bbf59cd40eb

commit r14-7084-gcf4dcf83a7df7805186aca7db0595bbf59cd40eb
Author: Juzhe-Zhong <juzhe.zhong@rivai.ai>
Date:   Wed Jan 10 09:00:05 2024 +0800

    RISC-V: Robostify dynamic lmul test
    
    While working on refining the cost model, I notice this test will generate unexpected
    scalar xor instructions if we don't tune cost model carefully.
    
    Add more assembler to avoid future regression.
    
    Committed.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.dg/vect/costmodel/riscv/rvv/dynamic-lmul2-7.c: Add assembler-not check.

Diff:
---
 gcc/testsuite/gcc.dg/vect/costmodel/riscv/rvv/dynamic-lmul2-7.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gcc/testsuite/gcc.dg/vect/costmodel/riscv/rvv/dynamic-lmul2-7.c b/gcc/testsuite/gcc.dg/vect/costmodel/riscv/rvv/dynamic-lmul2-7.c
index 87e963edc47..38cbefbe625 100644
--- a/gcc/testsuite/gcc.dg/vect/costmodel/riscv/rvv/dynamic-lmul2-7.c
+++ b/gcc/testsuite/gcc.dg/vect/costmodel/riscv/rvv/dynamic-lmul2-7.c
@@ -22,3 +22,4 @@ x264_pixel_8x8 (unsigned char *pix1, unsigned char *pix2, int i_stride_pix2)
 }
 
 /* { dg-final { scan-assembler {e32,m2} } } */
+/* { dg-final { scan-assembler-not {xor} } } */