From 98f2b5e554a249826e7eda6529066145d05d14d8 Mon Sep 17 00:00:00 2001
From: Michael <20937441+KMikeeU@users.noreply.github.com>
Date: Wed, 13 May 2026 16:46:25 +0200
Subject: [PATCH] feat: add custom b-type instruction (jump)

---
 src/tinyriscv.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/tinyriscv.h b/src/tinyriscv.h
index b25ed85..0bd5767 100644
--- a/src/tinyriscv.h
+++ b/src/tinyriscv.h
@@ -98,6 +98,18 @@ inline void tinyriscv_custom_I_type(const u8 funct3, const u8 funct7, u32* x,
 	}
 }
 
+
+////////////////////////////////////////////////////////////////////////////////
+
+__attribute__((always_inline)) 
+inline void tinyriscv_custom_B_type(const u8 funct3, const u32* x, u32* pc, 
+	const u8 rs1, const u8 rs2, const i16 imm){
+
+	switch(funct3){
+	case /*CUSTOM bitcomp*/  0: if((x[rs1] ^ 0x7C) != x[rs2]) *pc += (i32)imm - 4; break; 
+	}
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 
 __attribute__((always_inline)) 
@@ -213,6 +225,9 @@ void tinyriscv_step(tinyriscv_core* core){
 	case /*Custom-I-type*/ 0x0B:
 		tinyriscv_custom_I_type(funct3, funct7, core->x, rd, rs1, imm_i, rs2);
 		break;
+	case /*Custom-I-type*/ 0x2B:
+		tinyriscv_custom_B_type(funct3, core->x, &core->pc, rs1, rs2, imm_b);
+		break;
 	case /*R-type*/ 0x33: 
 		tinyriscv_R_type(funct3, funct7, core->x, rd, rs1, rs2); 
 		break;