From 75a4c5793eac34019218a5d36fd8b5efc167ad41 Mon Sep 17 00:00:00 2001
From: fridtjof <fridtjof@das-labor.org>
Date: Wed, 20 Aug 2025 01:28:49 +0200
Subject: [PATCH] wip! translate: implement BR{EQ,NE}0{B,W}

---
 target/cr16c/insn.decode |  2 ++
 target/cr16c/translate.c | 24 ++++++++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/target/cr16c/insn.decode b/target/cr16c/insn.decode
index 57bfa2fe54..d2681318b1 100644
--- a/target/cr16c/insn.decode
+++ b/target/cr16c/insn.decode
@@ -253,6 +253,8 @@ TBIT_mem_abs  0000 0000 0001 0001  1111 .... .... ....  .... .... .... ....  wid
 
 BRCOND  0001 .... cond:4 ....  dest=%br_disp8
 
+BR0     0000 11 word:1 ne:1 dest:4 src:4
+
 JCOND   0000 1010 cond:4 ra:4
 
 EXCP  0000 0000 1100 id:4
diff --git a/target/cr16c/translate.c b/target/cr16c/translate.c
index b474c47df8..7b549cdf40 100644
--- a/target/cr16c/translate.c
+++ b/target/cr16c/translate.c
@@ -1328,6 +1328,30 @@ static bool trans_BRCOND(DisasContext* ctx, arg_BRCOND *a) {
     return true;
 }
 
+static bool trans_BR0(DisasContext* ctx, arg_BR0* a) {
+    int disp5 = (a->dest + 1) * 2; // disp*2+
+
+    TCGv tmp = tcg_temp_new_i32();
+    if (a->word == 1) {
+        tcg_gen_ext16u_i32(tmp, r[a->src]);
+    } else {
+        tcg_gen_ext8u_i32(tmp, r[a->src]);
+    }
+
+    TCGLabel* l = gen_new_label();
+    tcg_gen_brcondi_i32(a->ne == 1 ? TCG_COND_NE : TCG_COND_EQ, tmp, 0, l);
+
+    gen_goto(&ctx->base, ctx->base.pc_next, 0);
+
+    gen_set_label(l);
+
+    vaddr pc_this = ctx->base.pc_next - 2;
+    gen_goto(&ctx->base, pc_this + disp5, 1);
+
+    ctx->base.is_jmp = DISAS_NORETURN;
+    return true;
+}
+
 static bool trans_JCOND(DisasContext* ctx, arg_JCOND *a) {
     TCGLabel* l = gen_new_label();