[Stable-8.2.3 64/87] target/riscv/vector_helper.c: fix 'vmvr_v' memcpy endianess

[Michael Tokarev]

From: Daniel Henrique Barboza <dbarboza@ventanamicro.com>

vmvr_v isn't handling the case where the host might be big endian and
the bytes to be copied aren't sequential.

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Fixes: f714361ed7 ("target/riscv: rvv-1.0: implement vstart CSR")
Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20240314175704.478276-4-dbarboza@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
(cherry picked from commit 768e7b329c0be22035da077fe76221dd0a47103b)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/target/riscv/vector_helper.c b/target/riscv/vector_helper.c
index 6215a0bc5e..d5a98acce0 100644
--- a/target/riscv/vector_helper.c
+++ b/target/riscv/vector_helper.c
@@ -5064,9 +5064,17 @@ void HELPER(vmvr_v)(void *vd, void *vs2, CPURISCVState 
*env, uint32_t desc)
     uint32_t startb = env->vstart * sewb;
     uint32_t i = startb;
 
+    if (HOST_BIG_ENDIAN && i % 8 != 0) {
+        uint32_t j = ROUND_UP(i, 8);
+        memcpy((uint8_t *)vd + H1(j - 1),
+               (uint8_t *)vs2 + H1(j - 1),
+               j - i);
+        i = j;
+    }
+
     memcpy((uint8_t *)vd + H1(i),
            (uint8_t *)vs2 + H1(i),
-           maxsz - startb);
+           maxsz - i);
 
     env->vstart = 0;
 }
-- 
2.39.2