scheduling insn on none

[Ian Lance Taylor]

"Tabony, Charles" <ctabony@qualcomm.com> writes:

> What does it mean by "unit none"?

First I'll note that you shouldn't see this when using the DFA
scheduler (define_insn_reservation, etc.).  You should only see it
when using the old pipeline description (define_function_unit, etc.).
The old pipeline description has been removed from the current
sources, but it was still present in 3.4.

"unit none" simply means that the scheduler doesn't know which
functional unit(s) are used by the insn.  The insn did not match any
of the tests in the various define_function_unit clauses.

If you actually wrote define_insn_reservation clauses, then see
TARGET_SCHED_USE_DFA_PIPELINE_INTERFACE.

Ian