From 9dc6d7180438031d25daf6a68a3959c3cfa9312d Mon Sep 17 00:00:00 2001
From: joshua <joshua@joshuayun.com>
Date: Tue, 14 Dec 2021 01:46:40 -0600
Subject: Initial Commit

---
 verilog/fpu/fpu.v | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 verilog/fpu/fpu.v

(limited to 'verilog/fpu/fpu.v')

diff --git a/verilog/fpu/fpu.v b/verilog/fpu/fpu.v
new file mode 100644
index 0000000..7ec70d9
--- /dev/null
+++ b/verilog/fpu/fpu.v
@@ -0,0 +1,71 @@
+module fpu
+(
+	input wire [31:0] fpu_in_1,
+	input wire [31:0] fpu_in_2,
+	output wire[31:0] fpu_output
+);
+
+reg[31:0] tmp_out;
+reg[22:0] fpu_reg_1;
+reg[22:0] fpu_reg_2;
+reg[7:0] exp;
+
+wire [7:0] dif_exp = fpu_in_1[30:23] - fpu_in_2[30:23];
+wire [7:0] neg_dif_exp = fpu_in_2[30:23] - fpu_in_1[30:23];
+
+reg[23:0] mantis_sum;
+
+always @ ( * )
+begin
+	/* $display("\nNEW TEST\n"); */
+	/* $display("\nMantissas R1: %16b R2: %16b", fpu_in_1[22:0], fpu_in_2[22:0]); */
+	/* $display("\ndif_exp[7]: %16b", dif_exp); */
+	if (dif_exp[7] == 1'b1) begin
+		fpu_reg_1 = fpu_in_1[22:0] >> 1;
+		fpu_reg_1[22] = 1'b1;
+		fpu_reg_1 = fpu_reg_1 >> neg_dif_exp-1;
+		fpu_reg_2 = fpu_in_2[22:0];
+		exp = fpu_in_2[30:23];
+		/* $display("\n1 1 smaller exp: %16b", neg_dif_exp, fpu_reg_1[22:0]); */
+	end else begin
+		if (dif_exp > 8'b0) begin
+			fpu_reg_2 = fpu_in_2 >> 1;
+			fpu_reg_2[22] = 1'b1;
+			fpu_reg_2 = fpu_reg_2 >> dif_exp-1;
+			/* $display("\n 2 smaller exp: %16b, shifted R2: %16b", dif_exp, fpu_reg_2[22:0]); */
+		end else begin
+			fpu_reg_2 = fpu_in_2[22:0];
+			/* $display("\nexp equal"); */
+		end
+		fpu_reg_1 = fpu_in_1[22:0];
+		exp = fpu_in_1[30:23];
+	end
+
+	/* $display("\nDenormalized mantissas: 1: %16b, 2: %16b: ", fpu_reg_1, fpu_reg_2); */
+	/* $display("\nexp: %16b", exp); */
+
+	mantis_sum = fpu_reg_1 + fpu_reg_2;
+
+	/* $display("\nmantis: %16b, exp:%16b", mantis_sum, exp); */
+
+	if (mantis_sum[23] == 1'b1) begin
+		exp = exp + 1;
+		mantis_sum = mantis_sum >> 1'b1;
+		if (dif_exp == 8'b0) begin
+			mantis_sum[22] = 1'b1;
+		end else begin
+			mantis_sum[22] = 1'b0;
+		end
+
+		/* $display("\nshifted exp: %16b", exp); */
+		/* $display("\nshifted mantis: %16b", mantis_sum); */
+	end
+
+
+	tmp_out[31] = 1'b0;
+	tmp_out[30:23] = exp;
+	tmp_out[22:0] = mantis_sum[22:0];
+end
+
+assign fpu_output = tmp_out;
+endmodule
-- 
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