mirrors/yosys
3
0
Fork 0
mirror of https://github.com/YosysHQ/yosys synced 2025-07-24 13:18:56 +00:00
Code Activity

opt_expr: const_xnor replacement to pad Y with 1'b1

Browse source
This commit is contained in:
Eddie Hung 2020-04-24 14:13:45 -07:00
parent ebd6fa945d
commit b5f38f8342
2 changed files with 48 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

46
tests/opt/opt_expr_xnor.ys
View file

@ -83,3 +83,49 @@ miter -equiv -flatten -make_assert -make_outputs gold coarse_keepdc miter3
sat -verify -prove-asserts -show-ports -enable_undef miter3
miter -equiv -flatten -make_assert -make_outputs coarse_keepdc fine_keepdc miter4
sat -verify -prove-asserts -show-ports -enable_undef miter4
# Single-bit $xnor extension
design -reset
read_verilog -noopt <<EOT
module gold(input i, output [1:0] o, p, q);
assign o = i ~^ i;
assign p = 1'b0 ~^ i;
assign q = 1'b1 ~^ i;
endmodule
EOT
select -assert-count 3 t:$xnor
copy gold coarse
copy gold fine
copy gold coarse_keepdc
copy gold fine_keepdc
cd coarse
opt_expr -fine
select -assert-none t:$xnor
cd fine
simplemap
opt_expr
select -assert-none t:$_XNOR_
cd
miter -equiv -flatten -make_assert -make_outputs -ignore_gold_x gold coarse miter
sat -verify -prove-asserts -show-ports -enable_undef miter
miter -equiv -flatten -make_assert -make_outputs coarse fine miter2
sat -verify -prove-asserts -show-ports -enable_undef miter2
cd coarse_keepdc
opt_expr -keepdc -fine
select -assert-count 1 t:$xnor
cd fine_keepdc
simplemap
opt_expr -keepdc
select -assert-count 0 c:$_XNOR_
cd
miter -equiv -flatten -make_assert -make_outputs gold coarse_keepdc miter3
sat -verify -prove-asserts -show-ports -enable_undef miter3
miter -equiv -flatten -make_assert -make_outputs coarse_keepdc fine_keepdc miter4
sat -verify -prove-asserts -show-ports -enable_undef miter4