target/arm: Implement MVE VRHADD
Implement the MVE VRHADD insn, which performs a rounded halving
addition.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210617121628.20116-40-peter.maydell@linaro.org
diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index fb8933a..8e18a96 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -531,6 +531,12 @@
DO_2OP_S(vrshls, DO_VRSHLS)
DO_2OP_U(vrshlu, DO_VRSHLU)
+#define DO_RHADD_S(N, M) (((int64_t)(N) + (M) + 1) >> 1)
+#define DO_RHADD_U(N, M) (((uint64_t)(N) + (M) + 1) >> 1)
+
+DO_2OP_S(vrhadds, DO_RHADD_S)
+DO_2OP_U(vrhaddu, DO_RHADD_U)
+
static inline int32_t do_sat_bhw(int64_t val, int64_t min, int64_t max, bool *s)
{
if (val > max) {
