[PATCH] target/riscv: Fix LMUL check to use minimum SEW

[Rob Bradford]

The previous check was failing with:

ELEN = 64 SEW = 16 and LMUL = 1/8 (encoded as 5) which is a valid
combination.

Fix the check to correctly match the specification by using minimum SEW
rather than the active SEW.

>From the specification:

"In general, the requirement is to support LMUL ≥ SEWMIN/ELEN, where
SEWMIN is the narrowest supported SEW value and ELEN is the widest
supported SEW value. In the standard extensions, SEWMIN=8. For standard
vector extensions with ELEN=32, fractional LMULs of 1/2 and 1/4 must be
supported. For standard vector extensions with ELEN=64, fractional LMULs
of 1/2, 1/4, and 1/8 must be supported."

>From inspection this new check allows:

ELEN=64 1/2, 1/4, 1/8 (encoded as 7, 6, 5 respectfully)
ELEN=32 1/2, 1/4 (encoded as 7 and 6 respectfully)

Fixes: d9b7609a1fb2 ("target/riscv: rvv-1.0: configure instructions")

Signed-off-by: Rob Bradford <rbradford@rivosinc.com>
---
 target/riscv/vector_helper.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/target/riscv/vector_helper.c b/target/riscv/vector_helper.c
index 1e06e7447c..8dfd8fe484 100644
--- a/target/riscv/vector_helper.c
+++ b/target/riscv/vector_helper.c
@@ -43,9 +43,9 @@ target_ulong HELPER(vsetvl)(CPURISCVState *env, target_ulong 
s1,
                                             xlen - 1 - R_VTYPE_RESERVED_SHIFT);
 
     if (lmul & 4) {
-        /* Fractional LMUL. */
+        /* Fractional LMUL - check LMUL >= ELEN/SEW_MIN (8) */
         if (lmul == 4 ||
-            cpu->cfg.elen >> (8 - lmul) < sew) {
+            cpu->cfg.elen >> (8 - lmul) < 8) {
             vill = true;
         }
     }
-- 
2.41.0