riscv
/
yosys
mirror of https://github.com/YosysHQ/yosys.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Fixes for improved techmap of shifts with large B inputs

This commit is contained in:
Clifford Wolf 2014-03-06 13:22:10 +01:00
parent 97710ffad5
commit 973507d85b
1 changed files with 8 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
techlibs/common/stdcells.v
View File

@ -165,7 +165,7 @@ parameter B_WIDTH = 1;
parameter Y_WIDTH = 1;
parameter WIDTH = Y_WIDTH;
localparam BB_WIDTH = $clog2(WIDTH) + 1 < B_WIDTH ? $clog2(WIDTH) + 1 : B_WIDTH;
localparam BB_WIDTH = $clog2(WIDTH) + 2 < B_WIDTH ? $clog2(WIDTH) + 2 : B_WIDTH;
input [A_WIDTH-1:0] A;
input [B_WIDTH-1:0] B;
@ -173,7 +173,7 @@ output [Y_WIDTH-1:0] Y;
genvar i;
generate
wire [WIDTH*(B_WIDTH+1)-1:0] chain;
wire [WIDTH*(BB_WIDTH+1)-1:0] chain;
\$bu0 #(
.A_SIGNED(A_SIGNED),
.A_WIDTH(A_WIDTH),
@ -224,7 +224,7 @@ parameter B_WIDTH = 1;
parameter Y_WIDTH = 1;
localparam WIDTH = A_WIDTH > Y_WIDTH ? A_WIDTH : Y_WIDTH;
localparam BB_WIDTH = $clog2(WIDTH) + 1 < B_WIDTH ? $clog2(WIDTH) + 1 : B_WIDTH;
localparam BB_WIDTH = $clog2(WIDTH) + 2 < B_WIDTH ? $clog2(WIDTH) + 2 : B_WIDTH;
input [A_WIDTH-1:0] A;
input [B_WIDTH-1:0] B;
@ -283,7 +283,7 @@ parameter B_WIDTH = 1;
parameter Y_WIDTH = 1;
localparam WIDTH = Y_WIDTH;
localparam BB_WIDTH = $clog2(WIDTH) + 1 < B_WIDTH ? $clog2(WIDTH) + 1 : B_WIDTH;
localparam BB_WIDTH = $clog2(WIDTH) + 2 < B_WIDTH ? $clog2(WIDTH) + 2 : B_WIDTH;
input [A_WIDTH-1:0] A;
input [B_WIDTH-1:0] B;
@ -291,7 +291,7 @@ output [Y_WIDTH-1:0] Y;
genvar i;
generate
wire [WIDTH*(B_WIDTH+1)-1:0] chain;
wire [WIDTH*(BB_WIDTH+1)-1:0] chain;
\$bu0 #(
.A_SIGNED(A_SIGNED),
.A_WIDTH(A_WIDTH),
@ -300,8 +300,8 @@ generate
.A(A),
.Y(chain[WIDTH-1:0])
);
assign Y = chain[WIDTH*(B_WIDTH+1)-1 : WIDTH*B_WIDTH];
for (i = 0; i < B_WIDTH; i = i + 1) begin:V
assign Y = chain[WIDTH*(BB_WIDTH+1)-1 : WIDTH*BB_WIDTH];
for (i = 0; i < BB_WIDTH; i = i + 1) begin:V
wire [WIDTH-1:0] unshifted, shifted, result;
assign unshifted = chain[WIDTH*i + WIDTH-1 : WIDTH*i];
assign chain[WIDTH*(i+1) + WIDTH-1 : WIDTH*(i+1)] = result;
@ -342,7 +342,7 @@ parameter B_WIDTH = 1;
parameter Y_WIDTH = 1;
localparam WIDTH = A_WIDTH > Y_WIDTH ? A_WIDTH : Y_WIDTH;
localparam BB_WIDTH = $clog2(WIDTH) + 1 < B_WIDTH ? $clog2(WIDTH) + 1 : B_WIDTH;
localparam BB_WIDTH = $clog2(WIDTH) + 2 < B_WIDTH ? $clog2(WIDTH) + 2 : B_WIDTH;
input [A_WIDTH-1:0] A;
input [B_WIDTH-1:0] B;