From d84718bf7955a6bba03aa44938f0f140c1a6390d Mon Sep 17 00:00:00 2001
From: Alejandro Soto <alejandro@34project.org>
Date: Sat, 21 Oct 2023 03:21:18 -0600
Subject: rtl/gfx: implement non-synthesizable matrix multiplier

---
 rtl/gfx/horizontal_fold.sv | 51 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 rtl/gfx/horizontal_fold.sv

(limited to 'rtl/gfx/horizontal_fold.sv')

diff --git a/rtl/gfx/horizontal_fold.sv b/rtl/gfx/horizontal_fold.sv
new file mode 100644
index 0000000..127150e
--- /dev/null
+++ b/rtl/gfx/horizontal_fold.sv
@@ -0,0 +1,51 @@
+`include "gfx/gfx_defs.sv"
+
+// Asume que N es una potencia de 2
+module horizontal_fold
+#(parameter N=1)
+(
+	input  logic clk,
+	             rst_n,
+
+	input  logic start,
+	input  fp    vec[N - 1:0],
+
+	output logic done,
+	output fp    q
+);
+
+	fp q_left, q_right;
+	logic halves_done;
+
+	generate
+		if (N > 1) begin
+			horizontal_fold #(.N(N / 2)) left
+			(
+				.q(q_left),
+				.vec(vec[N - 1:N / 2]),
+				.done(halves_done),
+				.*
+			);
+
+			horizontal_fold #(.N(N / 2)) right
+			(
+				.q(q_right),
+				.vec(vec[N / 2 - 1:0]),
+				.done(),
+				.*
+			);
+
+			fp_add fold
+			(
+				.a(q_left),
+				.b(q_right),
+				.start(halves_done),
+				.*
+			);
+		end else begin
+			assign q = vec[0];
+			assign done = start;
+		end
+	endgenerate
+
+endmodule
-- 
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