target/loongarch: Add fixed point bit instruction translation

This includes:
- EXT.W.{B/H}
- CL{O/Z}.{W/D}, CT{O/Z}.{W/D}
- BYTEPICK.{W/D}
- REVB.{2H/4H/2W/D}
- REVH.{2W/D}
- BITREV.{4B/8B}, BITREV.{W/D}
- BSTRINS.{W/D}, BSTRPICK.{W/D}
- MASKEQZ, MASKNEZ

Signed-off-by: Song Gao <gaosong@loongson.cn>
Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220606124333.2060567-7-yangxiaojuan@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 21 insertions, 0 deletions

diff --git a/target/loongarch/op_helper.c b/target/loongarch/op_helper.c
index 903810951e..f4b22c70a0 100644
--- a/target/loongarch/op_helper.c
+++ b/target/loongarch/op_helper.c
@@ -19,3 +19,24 @@ void helper_raise_exception(CPULoongArchState *env, uint32_t exception)
 {
     do_raise_exception(env, exception, GETPC());
 }
+
+target_ulong helper_bitrev_w(target_ulong rj)
+{
+    return (int32_t)revbit32(rj);
+}
+
+target_ulong helper_bitrev_d(target_ulong rj)
+{
+    return revbit64(rj);
+}
+
+target_ulong helper_bitswap(target_ulong v)
+{
+    v = ((v >> 1) & (target_ulong)0x5555555555555555ULL) |
+        ((v & (target_ulong)0x5555555555555555ULL) << 1);
+    v = ((v >> 2) & (target_ulong)0x3333333333333333ULL) |
+        ((v & (target_ulong)0x3333333333333333ULL) << 2);
+    v = ((v >> 4) & (target_ulong)0x0F0F0F0F0F0F0F0FULL) |
+        ((v & (target_ulong)0x0F0F0F0F0F0F0F0FULL) << 4);
+    return v;
+}