diff options
Diffstat (limited to 'gcc/modulo-sched.c')
| -rw-r--r-- | gcc/modulo-sched.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/gcc/modulo-sched.c b/gcc/modulo-sched.c index d12f53b..f2fd445 100644 --- a/gcc/modulo-sched.c +++ b/gcc/modulo-sched.c @@ -545,7 +545,7 @@ set_columns_for_ps (partial_schedule_ptr ps) The move is part of a chain that satisfies register dependencies between a producing ddg node and various consuming ddg nodes. If some of these dependencies have a distance of 1 (meaning that - the use is upward-exposoed) then DISTANCE1_USES is nonnull and + the use is upward-exposed) then DISTANCE1_USES is nonnull and contains the set of uses with distance-1 dependencies. DISTANCE1_USES is null otherwise. @@ -1810,7 +1810,11 @@ sms_schedule (void) 41. endif 42. compute epilogue & prologue 43. finish - succeeded to schedule -*/ + + ??? The algorithm restricts the scheduling window to II cycles. + In rare cases, it may be better to allow windows of II+1 cycles. + The window would then start and end on the same row, but with + different "must precede" and "must follow" requirements. */ /* A limit on the number of cycles that resource conflicts can span. ??? Should be provided by DFA, and be dependent on the type of insn scheduled. Currently |