rv32g-core

commit 34a9291bb58c54a908fd48f3f69abc9fd5ff62d6
parent 97385bda2d364514abda2a3df050a2122a88d572
Author: Vineet Kumar <git@vineetk.net>
Date:   Mon,  8 Jun 2026 15:07:18 -0400

fix faulty nop detection in decoding

this caused rv32ui-p-addi test to fail previously

Diffstat:
M
rtl/stage_decode.sv
 | 
6
+++---

1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/rtl/stage_decode.sv b/rtl/stage_decode.sv
@@ -219,13 +219,13 @@ module stage_decode
        SH: ctrl.memop = MEM_SH;
        SW: ctrl.memop = MEM_SW;
        ADDI: begin
-	 if (imm != 'b0 && rs1_val != 'b0) begin
-	   ctrl.aluop = ALU_ADD;
-	 end else begin // handle nop by doing a nop
+	 if (rd_num == 0 && rs1_num == 0 && imm == 0) begin // handle nop by doing a nop
 	   ctrl.aluop = ALU_NONE;
 	   ctrl.aluop1src = ALUOP1_NONE;
 	   ctrl.aluop2src = ALUOP2_NONE;
 	   ctrl.wbsrc = WB_NONE;
+	 end else begin
+	   ctrl.aluop = ALU_ADD;
 	 end
        end
        SLTI: ctrl.aluop = ALU_SLT;