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Diffstat (limited to 'gcc/target.h')
| -rw-r--r-- | gcc/target.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/gcc/target.h b/gcc/target.h index 8d73f496ba0..afbdad04aaa 100644 --- a/gcc/target.h +++ b/gcc/target.h @@ -113,6 +113,47 @@ struct gcc_target insn in the new chain we're building. Returns a new LAST. The default is to do nothing. */ rtx (* cycle_display) PARAMS ((int clock, rtx last)); + /* The following member value is a pointer to a function returning + nonzero if we should use DFA based scheduling. The default is + to use the old pipeline scheduler. */ + int (* use_dfa_pipeline_interface) PARAMS ((void)); + /* The values of all the following members are used only for the + DFA based scheduler: */ + /* The values of the following four members are pointers to + functions used to simplify the automaton descriptions. + dfa_pre_cycle_insn and dfa_post_cycle_insn give functions + returning insns which are used to change the pipeline hazard + recognizer state when the new simulated processor cycle + correspondingly starts and finishes. The function defined by + init_dfa_pre_cycle_insn and init_dfa_post_cycle_insn are used + to initialize the corresponding insns. The default values of + the memebers result in not changing the automaton state when + the new simulated processor cycle correspondingly starts and + finishes. */ + void (* init_dfa_pre_cycle_insn) PARAMS ((void)); + rtx (* dfa_pre_cycle_insn) PARAMS ((void)); + void (* init_dfa_post_cycle_insn) PARAMS ((void)); + rtx (* dfa_post_cycle_insn) PARAMS ((void)); + /* The following member value is a pointer to a function returning value + which defines how many insns in queue `ready' will we try for + multi-pass scheduling. if the member value is nonzero and the + function returns positive value, the DFA based scheduler will make + multi-pass scheduling for the first cycle. In other words, we will + try to choose ready insn which permits to start maximum number of + insns on the same cycle. */ + int (* first_cycle_multipass_dfa_lookahead) PARAMS ((void)); + /* The values of the following members are pointers to functions + used to improve the first cycle multipass scheduling by + inserting nop insns. dfa_scheduler_bubble gives a function + returning a nop insn with given index. The indexes start with + zero. The function should return NULL if there are no more nop + insns with indexes greater than given index. To initialize the + nop insn the function given by member + init_dfa_scheduler_bubbles is used. The default values of the + members result in not inserting nop insns during the multipass + scheduling. */ + void (* init_dfa_bubbles) PARAMS ((void)); + rtx (* dfa_bubble) PARAMS ((int)); } sched; /* Given two decls, merge their attributes and return the result. */ |