target/riscv: rvb: sign-extend instructions

Signed-off-by: Kito Cheng <kito.cheng@sifive.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Frank Chang <frank.chang@sifive.com>
Message-id: 20210505160620.15723-8-frank.chang@sifive.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

target/riscv/insn32.decode

@@ -663,6 +663,9 @@ vamomaxud_v     11100 . . ..... ..... 111 ..... 0101111 @r_wdvm
 clz        011000 000000 ..... 001 ..... 0010011 @r2
 ctz        011000 000001 ..... 001 ..... 0010011 @r2
 cpop       011000 000010 ..... 001 ..... 0010011 @r2
+sext_b     011000 000100 ..... 001 ..... 0010011 @r2
+sext_h     011000 000101 ..... 001 ..... 0010011 @r2
+
 andn       0100000 .......... 111 ..... 0110011 @r
 orn        0100000 .......... 110 ..... 0110011 @r
 xnor       0100000 .......... 100 ..... 0110011 @r

target/riscv/insn_trans/trans_rvb.c.inc

@@ -95,6 +95,18 @@ static bool trans_maxu(DisasContext *ctx, arg_maxu *a)
     return gen_arith(ctx, a, tcg_gen_umax_tl);
 }
 
+static bool trans_sext_b(DisasContext *ctx, arg_sext_b *a)
+{
+    REQUIRE_EXT(ctx, RVB);
+    return gen_unary(ctx, a, tcg_gen_ext8s_tl);
+}
+
+static bool trans_sext_h(DisasContext *ctx, arg_sext_h *a)
+{
+    REQUIRE_EXT(ctx, RVB);
+    return gen_unary(ctx, a, tcg_gen_ext16s_tl);
+}
+
 static bool trans_clzw(DisasContext *ctx, arg_clzw *a)
 {
     REQUIRE_64BIT(ctx);