From: Eddie Hung <eddie@fpgeh.com>
Date: Thu, 11 Apr 2019 01:05:09 +0000 (-0700)
Subject: WIP for cells_map.v -- maybe working?
X-Git-Tag: working-ls180~1208^2~360
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=cd7b2de27f4ffd097af7662a0390a5c86e5532a3;p=yosys.git

WIP for cells_map.v -- maybe working?
---

diff --git a/techlibs/xilinx/cells_map.v b/techlibs/xilinx/cells_map.v
index 253678028..93d60f60b 100644
--- a/techlibs/xilinx/cells_map.v
+++ b/techlibs/xilinx/cells_map.v
@@ -31,6 +31,7 @@ module \$shiftx (A, B, Y);
   parameter [B_WIDTH-1:0] _TECHMAP_CONSTMSK_B_ = 0;
   parameter [B_WIDTH-1:0] _TECHMAP_CONSTVAL_B_ = 0;
 
+  localparam NUM = A_WIDTH/Y_WIDTH;
   generate
     genvar i, j;
     if (B_SIGNED) begin
@@ -40,57 +41,51 @@ module \$shiftx (A, B, Y);
       else
         wire _TECHMAP_FAIL_ = 1;
     end
-    else if (Y_WIDTH > 1) begin
-      for (i = 0; i < Y_WIDTH; i++) begin
-        wire [A_WIDTH/Y_WIDTH-1:0] A_i;
-        for (j = 0; j < A_WIDTH/Y_WIDTH; j++)
-          assign A_i[j] = A[i*Y_WIDTH+j];
-        wire [$clog2(A_WIDTH/Y_WIDTH)-1:0] B_i = B/Y_WIDTH;
-        \$shiftx  #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(A_WIDTH/Y_WIDTH), .B_WIDTH($clog2(A_WIDTH/Y_WIDTH)), .Y_WIDTH(1)) bitblast (.A(A_i), .B(B_i), .Y(Y[i]));
-      end
-    end
-    else if (B_WIDTH < 3) begin
+    else if (NUM <= 4) begin
       wire _TECHMAP_FAIL_ = 1;
     end
-    else if (B_WIDTH == 3) begin
-      localparam a_width0 = 2 ** 2;
+    else if (NUM <= 8) begin
+      localparam a_width0 = Y_WIDTH * 4;
       localparam a_widthN = A_WIDTH - a_width0;
-      wire T0, T1;
+      wire [Y_WIDTH-1:0] T0, T1;
       \$shiftx  #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_width0), .B_WIDTH(B_WIDTH-1),        .Y_WIDTH(Y_WIDTH)) fpga_shiftx      (.A(A[a_width0-1:0]),       .B(B[B_WIDTH-2:0]), .Y(T0));
       \$shiftx  #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_widthN), .B_WIDTH($clog2(a_widthN)), .Y_WIDTH(Y_WIDTH)) fpga_shiftx_last (.A(A[A_WIDTH-1:a_width0]), .B(B[$clog2(a_widthN)-1:0]), .Y(T1));
-      MUXF7 fpga_mux (.I0(T0[i]), .I1(T1[i]), .S(B[B_WIDTH-1]), .O(Y[i]));
+      for (i = 0; i < Y_WIDTH; i++)
+        MUXF7 fpga_mux (.I0(T0[i]), .I1(T1[i]), .S(B[B_WIDTH-1]), .O(Y[i]));
     end
-    else if (B_WIDTH == 4) begin
-      localparam a_width0 = 2 ** 3;
+    else if (NUM <= 16) begin
+      localparam a_width0 = Y_WIDTH * 4;
       localparam num_mux8 = A_WIDTH / a_width0;
       localparam a_widthN = A_WIDTH - num_mux8*a_width0;
-      wire [B_WIDTH-1:0] T;
-      wire T0, T1;
-      for (i = 0; i < B_WIDTH; i++)
+      wire [Y_WIDTH*4-1:0] T;
+      wire [Y_WIDTH-1:0] T0, T1;
+      for (i = 0; i < 4; i++)
         if (i < num_mux8)
-          \$shiftx  #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_width0), .B_WIDTH(B_WIDTH-2),        .Y_WIDTH(Y_WIDTH)) fpga_shiftx      (.A(A[(i+1)*a_width0-1:i*a_width0]), .B(B[B_WIDTH-3:0]),          .Y(T[i]));
+          \$shiftx  #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_width0), .B_WIDTH(B_WIDTH-2), .Y_WIDTH(Y_WIDTH)) fpga_shiftx      (.A(A[(i+1)*a_width0-1:i*a_width0]), .B(B[B_WIDTH-3:0]), .Y(T[(i+1)*Y_WIDTH-1:i*Y_WIDTH]));
         else if (i == num_mux8 && a_widthN > 0)
-          \$shiftx  #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_widthN), .B_WIDTH($clog2(a_widthN)), .Y_WIDTH(Y_WIDTH)) fpga_shiftx_last (.A(A[A_WIDTH-1:i*a_width0]),        .B(B[$clog2(a_widthN)-1:0]), .Y(T[i]));
+          \$shiftx  #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_widthN), .B_WIDTH(B_WIDTH-2), .Y_WIDTH(Y_WIDTH)) fpga_shiftx_last (.A(A[A_WIDTH-1:i*a_width0]),        .B(B[B_WIDTH-3:0]), .Y(T[(i+1)*Y_WIDTH-1:i*Y_WIDTH]));
         else
-          assign T[i] = 1'bx;
-      MUXF7 fpga_mux_0 (.I0(T[0]), .I1(T[1]), .S(B[B_WIDTH-2]), .O(T0));
-      MUXF7 fpga_mux_1 (.I0(T[2]), .I1(T[3]), .S(B[B_WIDTH-2]), .O(T1));
-      MUXF8 fpga_mux_2 (.I0(T0),   .I1(T1),   .S(B[B_WIDTH-1]), .O(Y));
+          assign T[(i+1)*Y_WIDTH-1:i*Y_WIDTH] = {Y_WIDTH{1'bx}};
+      for (i = 0; i < Y_WIDTH; i++) begin
+        MUXF7 fpga_mux_0 (.I0(T[0*Y_WIDTH+i]), .I1(T[1*Y_WIDTH+i]), .S(B[B_WIDTH-2]), .O(T0[i]));
+        MUXF7 fpga_mux_1 (.I0(T[2*Y_WIDTH+i]), .I1(T[3*Y_WIDTH+i]), .S(B[B_WIDTH-2]), .O(T1[i]));
+        MUXF8 fpga_mux_2 (.I0(T0[i]),          .I1(T1[i]),          .S(B[B_WIDTH-1]), .O(Y[i]));
+      end
     end
     else begin
-      localparam a_width0 = 2 ** 4;
+      localparam a_width0 = Y_WIDTH * 16;
       localparam num_mux16 = A_WIDTH / a_width0;
       localparam a_widthN = A_WIDTH - num_mux16*a_width0;
-      wire [(2**(B_WIDTH-4))-1:0] T;
-      for (i = 0; i < 2 ** (B_WIDTH-4); i++)
+      wire [Y_WIDTH * (2 ** ($clog2(NUM)-4))-1:0] T;
+      for (i = 0; i < 2 ** ($clog2(NUM)-4); i++)
         if (i < num_mux16)
-          \$shiftx  #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_width0), .B_WIDTH(4),                .Y_WIDTH(Y_WIDTH)) fpga_shiftx      (.A(A[(i+1)*a_width0-1:i*a_width0]), .B(B[4-1:0]),                .Y(T[i]));
+          \$shiftx  #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_width0), .B_WIDTH($clog2(a_width0)), .Y_WIDTH(Y_WIDTH)) fpga_shiftx      (.A(A[(i+1)*a_width0-1:i*a_width0]), .B(B[$clog2(a_width0)-1:0]), .Y(T[(i+1)*Y_WIDTH-1:i*Y_WIDTH]));
         else if (i == num_mux16 && a_widthN > 0) begin
-          \$shiftx  #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_widthN), .B_WIDTH($clog2(a_widthN)), .Y_WIDTH(Y_WIDTH)) fpga_shiftx_last (.A(A[A_WIDTH-1:i*a_width0]),        .B(B[$clog2(a_widthN)-1:0]), .Y(T[i]));
+          \$shiftx  #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_widthN), .B_WIDTH($clog2(a_width0)), .Y_WIDTH(Y_WIDTH)) fpga_shiftx_last (.A(A[A_WIDTH-1:i*a_width0]),        .B(B[$clog2(a_width0)-1:0]), .Y(T[(i+1)*Y_WIDTH-1:i*Y_WIDTH]));
         end
         else
-          assign T[i] = 1'bx;
-      \$shiftx  #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(2**(B_WIDTH-4)), .B_WIDTH(B_WIDTH-4), .Y_WIDTH(Y_WIDTH)) fpga_shiftx (.A(T), .B(B[B_WIDTH-1:4]), .Y(Y));
+          assign T[(i+1)*Y_WIDTH-1:i*Y_WIDTH] = {Y_WIDTH{1'bx}};
+      \$shiftx  #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(Y_WIDTH * (2 ** ($clog2(NUM)-4))), .B_WIDTH(B_WIDTH-$clog2(a_width0)), .Y_WIDTH(Y_WIDTH)) fpga_shiftx (.A(T), .B(B[B_WIDTH-1:$clog2(a_width0)]), .Y(Y));
     end
   endgenerate
 endmodule