diff options
Diffstat (limited to 'gcc/ira-conflicts.c')
| -rw-r--r-- | gcc/ira-conflicts.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/gcc/ira-conflicts.c b/gcc/ira-conflicts.c index 8b8c48582ea..e467a7c60ee 100644 --- a/gcc/ira-conflicts.c +++ b/gcc/ira-conflicts.c @@ -331,7 +331,7 @@ go_through_subreg (rtx x, int *offset) static bool process_regs_for_copy (rtx reg1, rtx reg2, rtx insn, int freq) { - int hard_regno, cost, index, offset1, offset2; + int allocno_preferenced_hard_regno, cost, index, offset1, offset2; bool only_regs_p; ira_allocno_t a; enum reg_class rclass, cover_class; @@ -342,16 +342,18 @@ process_regs_for_copy (rtx reg1, rtx reg2, rtx insn, int freq) only_regs_p = REG_P (reg1) && REG_P (reg2); reg1 = go_through_subreg (reg1, &offset1); reg2 = go_through_subreg (reg2, &offset2); + /* Set up hard regno preferenced by allocno. If allocno gets the + hard regno the copy (or potential move) insn will be removed. */ if (HARD_REGISTER_P (reg1)) { if (HARD_REGISTER_P (reg2)) return false; - hard_regno = REGNO (reg1) + offset1 - offset2; + allocno_preferenced_hard_regno = REGNO (reg1) + offset1 - offset2; a = ira_curr_regno_allocno_map[REGNO (reg2)]; } else if (HARD_REGISTER_P (reg2)) { - hard_regno = REGNO (reg2) + offset2 - offset1; + allocno_preferenced_hard_regno = REGNO (reg2) + offset2 - offset1; a = ira_curr_regno_allocno_map[REGNO (reg1)]; } else if (!CONFLICT_ALLOCNO_P (ira_curr_regno_allocno_map[REGNO (reg1)], @@ -366,7 +368,10 @@ process_regs_for_copy (rtx reg1, rtx reg2, rtx insn, int freq) } else return false; - rclass = REGNO_REG_CLASS (hard_regno); + if (! IN_RANGE (allocno_preferenced_hard_regno, 0, FIRST_PSEUDO_REGISTER - 1)) + /* Can not be tied. */ + return false; + rclass = REGNO_REG_CLASS (allocno_preferenced_hard_regno); mode = ALLOCNO_MODE (a); cover_class = ALLOCNO_COVER_CLASS (a); if (! ira_class_subset_p[rclass][cover_class]) @@ -375,8 +380,9 @@ process_regs_for_copy (rtx reg1, rtx reg2, rtx insn, int freq) && reg_class_size[rclass] <= (unsigned) CLASS_MAX_NREGS (rclass, mode)) /* It is already taken into account in ira-costs.c. */ return false; - index = ira_class_hard_reg_index[cover_class][hard_regno]; + index = ira_class_hard_reg_index[cover_class][allocno_preferenced_hard_regno]; if (index < 0) + /* Can not be tied. It is not in the cover class. */ return false; if (HARD_REGISTER_P (reg1)) cost = ira_register_move_cost[mode][cover_class][rclass] * freq; |