rtl/fpu: initial commit

Imported from https://github.com/taneroksuz/fpu-sp

1 files changed, 44 insertions, 0 deletions

diff --git a/rtl/fpu/lzc/lzc_8.sv b/rtl/fpu/lzc/lzc_8.sv
new file mode 100644
index 0000000..562b79f
--- /dev/null
+++ b/rtl/fpu/lzc/lzc_8.sv
@@ -0,0 +1,44 @@
+module lzc_8 (
+    input [7:0] a,
+    output [2:0] c,
+    output v
+);
+
+  logic [1:0] z0;
+  logic [1:0] z1;
+
+  logic v0;
+  logic v1;
+
+  logic s0;
+  logic s1;
+  logic s2;
+  logic s3;
+  logic s4;
+  logic s5;
+  logic s6;
+
+  lzc_4 lzc_4_comp_0 (
+      .a(a[3:0]),
+      .c(z0),
+      .v(v0)
+  );
+
+  lzc_4 lzc_4_comp_1 (
+      .a(a[7:4]),
+      .c(z1),
+      .v(v1)
+  );
+
+  assign s0 = v1 | v0;
+  assign s1 = (~v1) & z0[0];
+  assign s2 = z1[0] | s1;
+  assign s3 = (~v1) & z0[1];
+  assign s4 = z1[1] | s3;
+
+  assign v = s0;
+  assign c[0] = s2;
+  assign c[1] = s4;
+  assign c[2] = v1;
+
+endmodule