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Merge pull request #4819 from povik/wreduce-resign

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wreduce: Optimize signedness when possible
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Martin Povišer 2025-01-06 15:27:55 +01:00 • committed by GitHub
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@ -0,0 +1,22 @@
read_verilog <<EOF
module top(a, b, y);
parameter awidth = 6;
parameter bwidth = 8;
parameter ywidth = 14;
input [awidth-1:0] a;
input [bwidth-1:0] b;
output [ywidth-1:0] y;
wire [ywidth-1:0] aext = {{(ywidth-awidth){a[awidth-1]}}, a};
wire [ywidth-1:0] bext = {{(ywidth-bwidth){b[bwidth-1]}}, b};
assign y = aext*bext;
endmodule
EOF
opt_clean
wreduce
select -assert-count 1 t:$mul
select -assert-count 1 t:$mul r:A_SIGNED=1 r:B_SIGNED=1 %i %i
select -assert-count 1 t:$mul r:A_WIDTH=6 r:B_WIDTH=8 %i %i