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|
`include "gfx/gfx_defs.sv"
module horizontal_fold
(
input logic clk,
input vec4 vec,
input logic stall,
feedback,
feedback_last,
output fp q
);
fp q_add;
vec2 feedback_vec, queued[`FP_ADD_STAGES];
assign feedback_vec = queued[`FP_ADD_STAGES - 1];
fp_add add
(
.a(feedback ? q_add : vec[0]),
.b(feedback ? feedback_vec[feedback_last] : vec[1]),
.q(q_add),
.*
);
skid_buf #(.WIDTH($bits(q))) skid
(
.in(q_add),
.out(q),
.*
);
always_ff @(posedge clk)
if (!stall) begin
if (feedback)
queued[0] <= feedback_vec;
else begin
queued[0][0] <= vec[2];
queued[0][1] <= vec[3];
end
end
genvar i;
generate
for (i = 1; i < `FLOATS_PER_VEC; ++i) begin: stages
always_ff @(posedge clk)
if (!stall)
queued[i] <= queued[i - 1];
end
endgenerate
endmodule
|
