mirror of
https://github.com/YosysHQ/yosys
synced 2025-04-06 17:44:09 +00:00
a855d62b42
The previously generated logic assumed an unconstrained past value in the initial state and did not handle 'x values. While the current formal verification flow uses 2-valued logic, SVA value change expressions require a past value of 'x during the initial state to behave in the expected way (i.e. to consider both an initial 0 and an initial 1 as $changed and an initial 1 as $rose and an initial 0 as $fell). This patch now generates logic that at the same time a) provides the expected behavior in a 2-valued logic setting, not depending on any dont-care optimizations, and b) properly handles 'x values in yosys simulation
74 lines
1.1 KiB
Bash
74 lines
1.1 KiB
Bash
#!/bin/bash
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set -ex
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prefix=${1%.ok}
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prefix=${prefix%.sv}
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prefix=${prefix%.vhd}
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test -f $prefix.sv -o -f $prefix.vhd
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generate_sby() {
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cat <<- EOT
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[options]
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mode bmc
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depth 10
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expect $1
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[engines]
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smtbmc yices
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[script]
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EOT
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if [ -f $prefix.sv ]; then
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if [ "$1" = "fail" ]; then
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echo "read -sv ${prefix}_fail.sv"
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else
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echo "read -sv $prefix.sv"
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fi
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fi
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if [ -f $prefix.vhd ]; then
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echo "read -vhdl $prefix.vhd"
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fi
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cat <<- EOT
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prep -top top
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chformal -early -assume
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[files]
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EOT
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if [ -f $prefix.sv ]; then
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echo "$prefix.sv"
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fi
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if [ -f $prefix.vhd ]; then
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echo "$prefix.vhd"
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fi
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if [ "$1" = "fail" ]; then
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cat <<- EOT
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[file ${prefix}_fail.sv]
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\`define FAIL
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\`include "$prefix.sv"
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EOT
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fi
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}
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if [ -f $prefix.ys ]; then
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$PWD/../../yosys -q -e "Assert .* failed." -s $prefix.ys
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elif [ -f $prefix.sv ]; then
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generate_sby pass > ${prefix}_pass.sby
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generate_sby fail > ${prefix}_fail.sby
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sby --yosys $PWD/../../yosys -f ${prefix}_pass.sby
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sby --yosys $PWD/../../yosys -f ${prefix}_fail.sby
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else
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generate_sby pass > ${prefix}.sby
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sby --yosys $PWD/../../yosys -f ${prefix}.sby
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fi
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touch $prefix.ok
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