1 files changed, 117 insertions, 0 deletions
diff --git a/rtl/gfx/gfx_sp_decode.sv b/rtl/gfx/gfx_sp_decode.sv
new file mode 100644
index 0000000..d24c608
--- /dev/null
+++ b/rtl/gfx/gfx_sp_decode.sv
@@ -0,0 +1,117 @@
+`include "gfx/gfx_isa.sv"
+`include "gfx/gfx_defs.sv"
+
+module gfx_sp_decode
+(
+	input  logic     clk,
+	                 rst_n,
+
+	input  logic     clear_lanes,
+	input  insn_word insn,
+	input  logic     insn_valid,
+	output logic     insn_ready,
+
+	output insn_deco deco,
+	input  logic     deco_ready,
+	output logic     deco_valid
+);
+
+	logic stall;
+	insn_deco deco_in, deco_out;
+
+	gfx_pipeline_flow #(.STAGES(1)) flow
+	(
+		.in_ready(insn_ready),
+		.in_valid(insn_valid),
+		.out_ready(deco_ready),
+		.out_valid(deco_valid),
+		.*
+	);
+
+	gfx_pipes #(.WIDTH($bits(deco)), .DEPTH(1)) pipe
+	(
+		.in(deco_in),
+		.out(deco_out),
+		.*
+	);
+
+	gfx_skid_buf #(.WIDTH($bits(deco))) skid
+	(
+		.in(deco_out),
+		.out(deco),
+		.*
+	);
+
+	always_comb begin
+		deco_in.writeback = 0;
+		deco_in.read_src_a = 0;
+		deco_in.read_src_b = 0;
+
+		deco_in.ex.stream = 0;
+		deco_in.ex.combiner = 0;
+		deco_in.ex.shuffler = 0;
+
+		deco_in.shuffler.is_imm = 1'bx;
+		deco_in.shuffler.is_swizzle = 1'bx;
+
+		unique casez (insn)
+			`GFX_INSN_OP_SELECT: begin
+				deco_in.writeback = 1;
+				deco_in.read_src_a = 1;
+				deco_in.read_src_b = 1;
+
+				deco_in.ex.shuffler = 1;
+				deco_in.shuffler.is_imm = 0;
+				deco_in.shuffler.is_swizzle = 0;
+			end
+
+			`GFX_INSN_OP_SWIZZL: begin
+				deco_in.writeback = 1;
+				deco_in.read_src_a = 1;
+
+				deco_in.ex.shuffler = 1;
+				deco_in.shuffler.is_imm = 0;
+				deco_in.shuffler.is_swizzle = 1;
+			end
+
+			`GFX_INSN_OP_BROADC: begin
+				deco_in.writeback = 1;
+
+				deco_in.ex.shuffler = 1;
+				deco_in.shuffler.is_imm = 1;
+				deco_in.shuffler.is_swizzle = 0;
+			end
+
+			`GFX_INSN_OP_MATVEC: begin
+				deco_in.writeback = 1;
+				deco_in.read_src_a = 1;
+				deco_in.read_src_b = 1;
+				deco_in.ex.combiner = 1;
+			end
+
+			`GFX_INSN_OP_SEND: begin
+				deco_in.read_src_a = 1;
+				deco_in.ex.stream = 1;
+			end
+
+			`GFX_INSN_OP_RECV: begin
+				deco_in.writeback = 1;
+				deco_in.ex.stream = 1;
+			end
+
+			default:
+				// Esto es jugar con fuego, pero lo vale con tal de que cierre el timing
+				deco_in = {($bits(deco_in)){1'bx}};
+		endcase
+
+		deco_in.dst = insn `GFX_INSN_DST;
+		deco_in.src_a = insn `GFX_INSN_SRC_A;
+		deco_in.src_b = insn `GFX_INSN_SRC_B;
+		deco_in.clear_lanes = clear_lanes;
+
+		deco_in.shuffler.imm = insn `GFX_INSN_BROADC_IMM;
+		deco_in.shuffler.select_mask = insn `GFX_INSN_SELECT_MASK;
+		deco_in.shuffler.swizzle_op = insn `GFX_INSN_SWIZZL_LANES;
+	end
+
+endmodule