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Diffstat (limited to 'gcc/doc/tm.texi')
| -rw-r--r-- | gcc/doc/tm.texi | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi index 0576d74d600..9e8de6d603a 100644 --- a/gcc/doc/tm.texi +++ b/gcc/doc/tm.texi @@ -5549,6 +5549,16 @@ scheduling one insn causes other insns to become ready in the same cycle. These other insns can then be taken into account properly. @end deftypefn +@deftypefn {Target Hook} void TARGET_SCHED_DEPENDENCIES_EVALUATION_HOOK (rtx @var{head}, rtx @var{tail}) +This hook is called after evaluation forward dependencies of insns in +chain given by two parameter values (@var{head} and @var{tail} +correspondingly) but before insns scheduling of the insn chain. For +example, it can be used for better insn classification if it requires +analysis of dependencies. This hook can use backward and forward +dependencies of the insn scheduler because they are already +calculated. +@end deftypefn + @deftypefn {Target Hook} void TARGET_SCHED_INIT (FILE *@var{file}, int @var{verbose}, int @var{max_ready}) This hook is executed by the scheduler at the beginning of each block of instructions that are to be scheduled. @var{file} is either a null @@ -5635,6 +5645,30 @@ schedules to choose the best one. The default is no multipass scheduling. @end deftypefn +@deftypefn {Target Hook} int TARGET_SCHED_FIRST_CYCLE_MULTIPASS_DFA_LOOKAHEAD_GUARD (rtx) + +This hook controls what insns from the ready insn queue will be +considered for the multipass insn scheduling. If the hook returns +zero for insn passed as the parameter, the insn will be not chosen to +be issued. + +The default is that any ready insns can be choosen to be issued. +@end deftypefn + +@deftypefn {Target Hook} int TARGET_SCHED_DFA_NEW_CYCLE (FILE *, int, rtx, int, int, int *) + +This hook is called by the insn scheduler before issuing insn passed +as the third parameter on given cycle. If the hook returns nonzero, +the insn is not issued on given processors cycle. Instead of that, +the processor cycle is advanced. If the value passed through the last +parameter is zero, the insn ready queue is not sorted on the new cycle +start as usually. The first parameter passes file for debugging +output. The second one passes the scheduler verbose level of the +debugging output. The forth and the fifth parameter values are +correspondingly processor cycle on which the previous insn has been +issued and the current processor cycle. +@end deftypefn + @deftypefn {Target Hook} void TARGET_SCHED_INIT_DFA_BUBBLES (void) The @acronym{DFA}-based scheduler could take the insertion of nop operations for better insn scheduling into account. It can be done |