4 files changed, 9 insertions, 1 deletions

diff --git a/gas/config/tc-riscv.c b/gas/config/tc-riscv.c
index 0682eb3..77c0d2e 100644
--- a/gas/config/tc-riscv.c
+++ b/gas/config/tc-riscv.c
@@ -1206,7 +1206,8 @@ arg_lookup (char **s, const char *const *array, size_t size, unsigned *regnop)
     return false;
 
   for (i = 0; i < size; i++)
-    if (array[i] != NULL && strncmp (array[i], *s, len) == 0)
+    if (array[i] != NULL && strncmp (array[i], *s, len) == 0
+	&& array[i][len] == '\0')
       {
 	*regnop = i;
 	*s += len;
diff --git a/gas/testsuite/gas/riscv/vector-insns-fail-vsew.d b/gas/testsuite/gas/riscv/vector-insns-fail-vsew.d
new file mode 100644
index 0000000..e0354d1
--- /dev/null
+++ b/gas/testsuite/gas/riscv/vector-insns-fail-vsew.d
@@ -0,0 +1,3 @@
+#as: -march=rv32iv
+#source: vector-insns-fail-vsew.s
+#error_output: vector-insns-fail-vsew.l
diff --git a/gas/testsuite/gas/riscv/vector-insns-fail-vsew.l b/gas/testsuite/gas/riscv/vector-insns-fail-vsew.l
new file mode 100644
index 0000000..87a2c22
--- /dev/null
+++ b/gas/testsuite/gas/riscv/vector-insns-fail-vsew.l
@@ -0,0 +1,3 @@
+.*: Assembler messages:
+.*: Error: instruction vsetvli requires absolute expression
+.*: Error: illegal operands `vsetvli a0,a1,e6,mf8,tu,ma'
diff --git a/gas/testsuite/gas/riscv/vector-insns-fail-vsew.s b/gas/testsuite/gas/riscv/vector-insns-fail-vsew.s
new file mode 100644
index 0000000..b8f3242
--- /dev/null
+++ b/gas/testsuite/gas/riscv/vector-insns-fail-vsew.s
@@ -0,0 +1 @@
+	vsetvli  a0, a1, e6, mf8, tu, ma		# unrecognized vsew