[scheduling] Use ASAP/ALAP bounds in the SDC scheduler#4489
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By providing tighter initial ranges for the cycle variables in the LP model, the solver saves (apparently significant) time. This also lets us use the ASAP scheduler to compute the minimum possible pipeline length, if we need it. If the ASAP scheduler fails to converge (which is possible for complex constraints, but rare), we fall back to using the SDC scheduler directly. PiperOrigin-RevId: 939372611
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[scheduling] Use ASAP/ALAP bounds in the SDC scheduler
By providing tighter initial ranges for the cycle variables in the LP model, the solver saves (apparently significant) time. This also lets us use the ASAP scheduler to compute the minimum possible pipeline length, if we need it.
If the ASAP scheduler fails to converge (which is possible for complex constraints, but rare), we fall back to using the SDC scheduler directly.