This implements the AES64IM instruction.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/riscv/crypto_helper.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/target/riscv/crypto_helper.c b/target/riscv/crypto_helper.c
index e61f7fe1e5..505166ce5a 100644
--- a/target/riscv/crypto_helper.c
+++ b/target/riscv/crypto_helper.c
@@ -272,17 +272,12 @@ target_ulong HELPER(aes64ks1i)(target_ulong rs1, target_ulong rnum)
 
 target_ulong HELPER(aes64im)(target_ulong rs1)
 {
-    uint64_t RS1 = rs1;
-    uint32_t col_0 = RS1 & 0xFFFFFFFF;
-    uint32_t col_1 = RS1 >> 32;
-    target_ulong result;
+    AESState t;
 
-    col_0 = AES_INVMIXCOLUMN(col_0);
-    col_1 = AES_INVMIXCOLUMN(col_1);
-
-    result = ((uint64_t)col_1 << 32) | col_0;
-
-    return result;
+    t.d[HOST_BIG_ENDIAN] = rs1;
+    t.d[!HOST_BIG_ENDIAN] = 0;
+    aesdec_IMC(&t, &t, false);
+    return t.d[HOST_BIG_ENDIAN];
 }
 
 target_ulong HELPER(sm4ed)(target_ulong rs1, target_ulong rs2,
-- 
2.34.1