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Add back SV for integer division to use 8-bit CPA in qslc

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James Stine 2022-06-15 11:46:39 -05:00
parent 535a9a04ee
commit d69a8f4077
1 changed files with 3 additions and 3 deletions
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6
pipelined/srt/stine/intdiv.sv
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@ -195,7 +195,7 @@ module divide4 #(parameter WIDTH=64)
logic [WIDTH:0] Qstar;
logic [WIDTH:0] QMstar;
logic [WIDTH:0] QM2star;
logic [6:0] qtotal;
logic [7:0] qtotal;
logic [WIDTH+3:0] SumN, CarryN, SumN2, CarryN2;
logic [WIDTH+3:0] divi1, divi2, divi1c, divi2c, dive1;
logic [WIDTH+3:0] mdivi_temp, mdivi;
@ -219,9 +219,9 @@ module divide4 #(parameter WIDTH=64)
mux2 #(WIDTH+4) mx2 ({CarryN2[WIDTH+1:0], 2'h0}, {WIDTH+4{1'b0}}, state0, CarryN);
mux2 #(WIDTH+4) mx3 ({SumN2[WIDTH+1:0], 2'h0}, dive1, state0, SumN);
// Simplify QST
adder #(7) cpa1 (SumN[WIDTH+3:WIDTH-3], CarryN[WIDTH+3:WIDTH-3], qtotal);
adder #(8) cpa1 (SumN[WIDTH+3:WIDTH-4], CarryN[WIDTH+3:WIDTH-4], qtotal);
// q = {+2, +1, -1, -2} else q = 0
qst4 pd1 (qtotal[6:0], divi1[WIDTH-1:WIDTH-3], quotient);
qst4 pd1 (qtotal[7:1], divi1[WIDTH-1:WIDTH-3], quotient);
assign ulp = quotient[2]|quotient[3];
assign zero = ~(quotient[3]|quotient[2]|quotient[1]|quotient[0]);
// Map to binary encoding