tcg: Implement gvec support for rotate by immediate

No host backend support yet, but the interfaces for rotli
are in place.  Canonicalize immediate rotate to the left,
based on a survey of architectures, but provide both left
and right shift interfaces to the translators.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/tcg/tcg.c b/tcg/tcg.c
index a2268d9db0..73a3a4fb9e 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -1661,6 +1661,8 @@ bool tcg_op_supported(TCGOpcode op)
     case INDEX_op_shrv_vec:
     case INDEX_op_sarv_vec:
         return have_vec && TCG_TARGET_HAS_shv_vec;
+    case INDEX_op_rotli_vec:
+        return have_vec && TCG_TARGET_HAS_roti_vec;
     case INDEX_op_ssadd_vec:
     case INDEX_op_usadd_vec:
     case INDEX_op_sssub_vec: