[RFC PATCH v2 18/22] target/mips/tx79: Introduce PROT3W opcode (Parallel Rotate 3 Words)

[Philippe Mathieu-Daudé]

Introduce the PROT3W opcode (Parallel Rotate 3 Words).

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210214175912.732946-25-f4bug@amsat.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 target/mips/tx79.decode      |  1 +
 target/mips/tx79_translate.c | 28 ++++++++++++++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/target/mips/tx79.decode b/target/mips/tx79.decode
index 0ea9fc95568..79001359242 100644
--- a/target/mips/tx79.decode
+++ b/target/mips/tx79.decode
@@ -56,6 +56,7 @@ PAND            011100 ..... ..... ..... 10010 001001   
@rs_rt_rd
 PXOR            011100 ..... ..... ..... 10011 001001   @rs_rt_rd
 PEXEH           011100 00000 ..... ..... 11010 001001   @rt_rd
 PEXEW           011100 00000 ..... ..... 11110 001001   @rt_rd
+PROT3W          011100 00000 ..... ..... 11111 001001   @rt_rd
 
 # MMI3
 
diff --git a/target/mips/tx79_translate.c b/target/mips/tx79_translate.c
index b23e0a1b048..f1c6546d70c 100644
--- a/target/mips/tx79_translate.c
+++ b/target/mips/tx79_translate.c
@@ -685,3 +685,31 @@ static bool trans_PEXEW(DisasContext *ctx, arg_rtype *a)
 
     return true;
 }
+
+/* Parallel Rotate 3 Words Left */
+static bool trans_PROT3W(DisasContext *ctx, arg_rtype *a)
+{
+    TCGv_i64 ax;
+
+    if (a->rd == 0) {
+        /* nop */
+        return true;
+    }
+    if (a->rt == 0) {
+        tcg_gen_movi_i64(cpu_gpr[a->rd], 0);
+        tcg_gen_movi_i64(cpu_gpr_hi[a->rd], 0);
+        return true;
+    }
+
+    ax = tcg_temp_new_i64();
+
+    tcg_gen_mov_i64(ax, cpu_gpr_hi[a->rt]);
+    tcg_gen_deposit_i64(cpu_gpr_hi[a->rd], ax, cpu_gpr[a->rt], 0, 32);
+
+    tcg_gen_deposit_i64(cpu_gpr[a->rd], cpu_gpr[a->rt], ax, 0, 32);
+    tcg_gen_rotri_i64(cpu_gpr[a->rd], cpu_gpr[a->rd], 32);
+
+    tcg_temp_free(ax);
+
+    return true;
+}
-- 
2.26.2