Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/sparc/translate.c  | 18 ++++++++++++++++++
 target/sparc/insns.decode |  1 +
 2 files changed, 19 insertions(+)

diff --git a/target/sparc/translate.c b/target/sparc/translate.c
index c26fd04598..761ae204b9 100644
--- a/target/sparc/translate.c
+++ b/target/sparc/translate.c
@@ -667,6 +667,11 @@ static void gen_op_popc(TCGv dst, TCGv src1, TCGv src2)
     tcg_gen_ctpop_tl(dst, src2);
 }
 
+static void gen_op_lzcnt(TCGv dst, TCGv src)
+{
+    tcg_gen_clzi_tl(dst, src, TARGET_LONG_BITS);
+}
+
 #ifndef TARGET_SPARC64
 static void gen_helper_array8(TCGv dst, TCGv src1, TCGv src2)
 {
@@ -3869,6 +3874,19 @@ TRANS(EDGE16LN, VIS2, gen_edge, a, 16, 0, 1)
 TRANS(EDGE32N, VIS2, gen_edge, a, 32, 0, 0)
 TRANS(EDGE32LN, VIS2, gen_edge, a, 32, 0, 1)
 
+static bool do_rr(DisasContext *dc, arg_r_r *a,
+                  void (*func)(TCGv, TCGv))
+{
+    TCGv dst = gen_dest_gpr(dc, a->rd);
+    TCGv src = gen_load_gpr(dc, a->rs);
+
+    func(dst, src);
+    gen_store_gpr(dc, a->rd, dst);
+    return advance_pc(dc);
+}
+
+TRANS(LZCNT, VIS3, do_rr, a, gen_op_lzcnt)
+
 static bool do_rrr(DisasContext *dc, arg_r_r_r *a,
                    void (*func)(TCGv, TCGv, TCGv))
 {
diff --git a/target/sparc/insns.decode b/target/sparc/insns.decode
index 353d26b9e6..f7f532002a 100644
--- a/target/sparc/insns.decode
+++ b/target/sparc/insns.decode
@@ -389,6 +389,7 @@ FCMPEq      10 000 cc:2 110101 .....  0 0101 0111 .....    \
 
     ADDXC       10 ..... 110110 ..... 0 0001 0001 .....    @r_r_r
     ADDXCcc     10 ..... 110110 ..... 0 0001 0011 .....    @r_r_r
+    LZCNT       10 ..... 110110 00000 0 0001 0111 .....    @r_r2
 
     ALIGNADDR   10 ..... 110110 ..... 0 0001 1000 .....    @r_r_r
     ALIGNADDRL  10 ..... 110110 ..... 0 0001 1010 .....    @r_r_r
-- 
2.34.1

On 2/3/24 06:15, Richard Henderson wrote:
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>   target/sparc/translate.c  | 18 ++++++++++++++++++
>   target/sparc/insns.decode |  1 +
>   2 files changed, 19 insertions(+)

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>