contrib/gcc/haifa-sched.c

734 	  rtx prev_first, twin;
746 	      twin = insn;
751 	      twin = PREV_INSN (BB_END (rec));
756 	      for (link = INSN_DEPEND (twin); link; link = XEXP (link, 1))
782 						  twin == insn ?
785 						  twin == insn ? link : 0,
793 	      twin = PREV_INSN (twin);
795 	  while (twin != prev_first);
3360 process_insn_depend_be_in_spec (rtx link, rtx twin, ds_t fs)
3396       add_back_forw_dep (consumer, twin, REG_NOTE_KIND (link), ds);
3454       rtx link, check, twin;
3469       twin = emit_insn_before (copy_rtx (PATTERN (insn)), BB_END (rec));
3470       extend_global (twin);
3472       RESOLVED_DEPS (twin) = copy_DEPS_LIST_list (RESOLVED_DEPS (insn));
3475         /* INSN_BB (insn) isn't determined for twin insns yet.
3477         fprintf (spec_info->dump, ";;\t\tGenerated twin insn : %d/rec%d\n",
3478                  INSN_UID (twin), rec->index);
3480       twins = alloc_INSN_LIST (twin, twins);
3486 	  add_back_forw_dep (twin, check, REG_DEP_TRUE, DEP_TRUE);
3504       process_insn_depend_be_in_spec (INSN_DEPEND (insn), twin, ts);
3521   /* We can't add the dependence between insn and twin earlier because
3522      that would make twin appear in the INSN_DEPEND (insn).  */
3525       rtx twin;
3527       twin = XEXP (twins, 0);
3528       calc_priorities (twin);
3529       add_back_forw_dep (twin, insn, REG_DEP_OUTPUT, DEP_OUTPUT);
3531       twin = XEXP (twins, 1);
3533       twins = twin;
3715   rtx label, check, twin, link;
3761   /* Initialize TWIN (twin is a duplicate of original instruction
3775       twin = emit_insn_after (ORIG_PAT (insn), BB_END (rec));
3776       extend_global (twin);
3779 	/* INSN_BB (insn) isn't determined for twin insns yet.
3781 	fprintf (spec_info->dump, ";;\t\tGenerated twin insn : %d/rec%d\n",
3782 		 INSN_UID (twin), rec->index);
3788       twin = check;
3793   RESOLVED_DEPS (twin) = copy_DEPS_LIST_list (RESOLVED_DEPS (insn));
3862 	 twin  --TRUE--> producer
3863 	 twin  --ANTI--> check
3867 	 twin  --ANTI--> producer
3868 	 twin  --ANTI--> check
3872 	 twin  ~~TRUE~~> producer
3873 	 twin  --ANTI--> check  */
3886 	  add_back_forw_dep (twin, XEXP (link, 0), REG_NOTE_KIND (link), ds);
3927   process_insn_depend_be_in_spec (INSN_DEPEND (insn), twin, fs);
3938 	  add_back_forw_dep (twin, insn, REG_DEP_OUTPUT, DEP_OUTPUT);
3955       add_back_forw_dep (twin, check, REG_DEP_ANTI, DEP_ANTI);
3964       clear_priorities (twin);
3965       calc_priorities (twin);