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conversion for implicitly variably sized parameters

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This commit is contained in:
Zachary Snow
2020-08-12 21:59:57 -04:00
parent e4135bb896
commit e80db12422
9 changed files with 202 additions and 21 deletions
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test/basic/string.sv
+1 -1
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@@ -1,5 +1,5 @@
module top;
parameter FOO = "some useful string";
localparam FOO = "some useful string";
localparam type T = type(FOO);
localparam T BAR = "some other useful string";
initial $display("'%s' '%s'", FOO, BAR);
test/basic/string.v
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@@ -1,5 +1,5 @@
module top;
parameter FOO = "some useful string";
localparam FOO = "some useful string";
localparam BAR = "some other useful string";
initial $display("'%s' '%s'", FOO, BAR);
endmodule
test/basic/string_param.sv
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@@ -0,0 +1,16 @@
`include "string_param.vh"
module Example(inp, out);
parameter PATTERN = "whatever";
parameter UNUSED = 0;
localparam IN_WIDTH = $bits(PATTERN);
localparam OUT_WIDTH = `COUNT_ONES(PATTERN);
input [IN_WIDTH - 1:0] inp;
output [OUT_WIDTH - 1:0] out;
if (PATTERN[0])
assign out[0] = inp[0];
for (genvar j = 1; j < IN_WIDTH; ++j)
if (PATTERN[j])
assign out[`COUNT_ONES(PATTERN[j - 1:0])] = inp[j];
endmodule
test/basic/string_param.v
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@@ -0,0 +1,16 @@
`include "string_param.vh"
module Example(inp, out);
parameter PATTERN = "whatever";
parameter IN_WIDTH = $bits(PATTERN);
localparam OUT_WIDTH = `COUNT_ONES(PATTERN);
input wire [IN_WIDTH - 1:0] inp;
output wire [OUT_WIDTH - 1:0] out;
if (PATTERN[0])
assign out[0] = inp[0];
genvar j;
for (j = 1; j < IN_WIDTH; j = j + 1)
if (PATTERN[j])
assign out[`COUNT_ONES(PATTERN[j - 1:0])] = inp[j];
endmodule
test/basic/string_param.vh
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@@ -0,0 +1,33 @@
`define COUNT_ONES(expr) (0 \
+ ((expr) >> 0 & 1'b1) + ((expr) >> 1 & 1'b1) + ((expr) >> 2 & 1'b1) + ((expr) >> 3 & 1'b1) \
+ ((expr) >> 4 & 1'b1) + ((expr) >> 5 & 1'b1) + ((expr) >> 6 & 1'b1) + ((expr) >> 7 & 1'b1) \
+ ((expr) >> 8 & 1'b1) + ((expr) >> 9 & 1'b1) + ((expr) >> 10 & 1'b1) + ((expr) >> 11 & 1'b1) \
+ ((expr) >> 12 & 1'b1) + ((expr) >> 13 & 1'b1) + ((expr) >> 14 & 1'b1) + ((expr) >> 15 & 1'b1) \
+ ((expr) >> 16 & 1'b1) + ((expr) >> 17 & 1'b1) + ((expr) >> 18 & 1'b1) + ((expr) >> 19 & 1'b1) \
+ ((expr) >> 20 & 1'b1) + ((expr) >> 21 & 1'b1) + ((expr) >> 22 & 1'b1) + ((expr) >> 23 & 1'b1) \
+ ((expr) >> 24 & 1'b1) + ((expr) >> 25 & 1'b1) + ((expr) >> 26 & 1'b1) + ((expr) >> 27 & 1'b1) \
+ ((expr) >> 28 & 1'b1) + ((expr) >> 29 & 1'b1) + ((expr) >> 30 & 1'b1) + ((expr) >> 31 & 1'b1) \
)
module top;
reg [31:0] data;
`define TEST(idx, pattern, in_width, out_width) \
localparam p``idx = pattern; \
wire [in_width - 1:0] i``idx; \
wire [out_width - 1:0] o``idx; \
assign i``idx = data[0+:in_width]; \
Example #(p``idx, in_width) e``idx(i``idx, o``idx);
`TEST(1, 5'b10101, 5, 3)
`TEST(2, 10'b1110001111, 10, 7)
integer i;
initial begin
data = 0;
for (i = 0; i < 100; i = i + 1) begin
data = 1664525 * data + 1013904223;
#1 $display("%b %b %b", data, o1, o2);
end
end
endmodule