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critical path optimizations

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This commit is contained in:
Blaise Tine
2021-09-15 04:50:45 -07:00
parent 73d102afed
commit feca2db24e
4 changed files with 49 additions and 50 deletions
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40
hw/rtl/libs/VX_priority_encoder.v
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@@ -46,17 +46,17 @@ module VX_priority_encoder #(
.data_out (scan_lo)
);
VX_lzc #(
.N (N)
) lzc (
.in_i (reversed),
.cnt_o (index),
`UNUSED_PIN (valid_o)
);
assign onehot = scan_lo & {(~scan_lo[N-2:0]), 1'b1};
assign valid_out = scan_lo[N-1];
VX_onehot_encoder #(
.N (N)
) onehot_encoder (
.data_in (onehot),
.data_out (index),
`UNUSED_PIN (valid_out)
);
end else if (MODEL == 2) begin
`IGNORE_WARNINGS_BEGIN
@@ -66,30 +66,26 @@ module VX_priority_encoder #(
assign higher_pri_regs[0] = 1'b0;
assign onehot[N-1:0] = reversed[N-1:0] & ~higher_pri_regs[N-1:0];
VX_onehot_encoder #(
VX_lzc #(
.N (N)
) onehot_encoder (
.data_in (onehot),
.data_out (index),
`UNUSED_PIN (valid_out)
) lzc (
.in_i (reversed),
.cnt_o (index),
.valid_o (valid_out)
);
assign valid_out = (| reversed);
end else if (MODEL == 3) begin
assign onehot = reversed & ~(reversed-1);
VX_onehot_encoder #(
VX_lzc #(
.N (N)
) onehot_encoder (
.data_in (onehot),
.data_out (index),
`UNUSED_PIN (valid_out)
) lzc (
.in_i (reversed),
.cnt_o (index),
.valid_o (valid_out)
);
assign valid_out = (| reversed);
end else begin
reg [LN-1:0] index_r;