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Merge pull request #1648 from YosysHQ/eddie/cmp2lcu

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"techmap -map +/cmp2lcu.v" for decomposing arithmetic compares to $lcu
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Eddie Hung 2020-04-03 16:28:25 -07:00 • committed by GitHub
commit d61a6b81fc
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6 changed files with 173 additions and 13 deletions
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tests/techmap/cmp2lcu.ys Normal file
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read_verilog <<EOT
module top(input [12:0] a, b, output gtu, gts, ltu, lts, geu, ges, leu, les);
assign gtu = a > b;
assign gts = $signed(a) > $signed(b);
assign ltu = a < b;
assign lts = $signed(a) < $signed(b);
assign geu = a >= b;
assign ges = $signed(a) >= $signed(b);
assign leu = a <= b;
assign les = $signed(a) <= $signed(b);
endmodule
EOT
equiv_opt -assert techmap -map +/cmp2lcu.v -D LUT_WIDTH=6
design -load postopt
select -assert-count 8 t:$lcu r:WIDTH=5 %i
select -assert-none t:$gt t:$ge t:$lt t:$le
design -load preopt
equiv_opt -assert techmap -map +/cmp2lcu.v -D LUT_WIDTH=4
design -load postopt
select -assert-count 8 t:$lcu r:WIDTH=7 %i
select -assert-none t:$gt t:$ge t:$lt t:$le
design -reset
read_verilog <<EOT
module top(input [8:0] a, b, output gtu, gts, ltu, lts, geu, ges, leu, les);
wire [13:0] c = {a[8:6], 3'b101, a[5:4], 2'b11, a[3:0]};
wire [13:0] d = {b[8], 3'b101, b[7:4], 2'b01, b[3:0]};
assign gtu = c > d;
assign gts = $signed(c) > $signed(d);
assign ltu = c < d;
assign lts = $signed(c) < $signed(d);
assign geu = c >= d;
assign ges = $signed(c) >= $signed(d);
assign leu = c <= d;
assign les = $signed(c) <= $signed(d);
endmodule
EOT
design -save gold
equiv_opt -assert techmap -map +/cmp2lcu.v -D LUT_WIDTH=5
design -load postopt
select -assert-count 8 t:$lcu r:WIDTH=2 %i
select -assert-none t:$gt t:$ge t:$lt t:$le
design -load preopt
equiv_opt -assert techmap -map +/cmp2lcu.v -D LUT_WIDTH=3
design -load postopt
select -assert-count 8 t:$lcu r:WIDTH=4 %i
select -assert-none t:$gt t:$ge t:$lt t:$le