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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
9 lines
95 B
Plaintext
9 lines
95 B
Plaintext
/*_pass.sby
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/*_fail.sby
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/*_pass
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/*_fail
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/*.ok
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/*.fst
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/vhdlpsl[0-9][0-9]
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/vhdlpsl[0-9][0-9].sby
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