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Do not frighten future COMPRESS-INSTRUCTIONS spelunkers #846

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Sep 7, 2022
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Do not frighten future COMPRESS-INSTRUCTIONS spelunkers #846

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8 changes: 8 additions & 0 deletions src/compressor/compressor.lisp
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Original file line number Diff line number Diff line change
Expand Up @@ -787,6 +787,14 @@ Its role is to find SHORT SEQUENCES (so that producing their matrix form is not
;; involve fewer qubits
(t
(multiple-value-bind (r-output r-queues)
;; After running compression at QUEUE-TOLERANCE-THRESHOLD, it's desirable to
;; shrink the queue width down to 2 immediately because no new
;; compilers/reducers will be introduced until the queue width is shrunk
;; down to a hardware object. While it is theoretically possible for a
;; general compiler to apply at queue width 3 but not at queue width 4,
;; (because a slightly different set of instructions will be selected for
;; compilation), it's highly unlikely and generally not worth the large
;; performance impact
(compress-instructions once-compressed-instructions chip-specification
:protoquil protoquil
:queue-tolerance-threshold (min 2 (1- (compression-queue-num-qubits queue)))
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