diff options
Diffstat (limited to 'gcc/local-alloc.c')
| -rw-r--r-- | gcc/local-alloc.c | 56 |
1 files changed, 27 insertions, 29 deletions
diff --git a/gcc/local-alloc.c b/gcc/local-alloc.c index f46b9c9..cd1c01d 100644 --- a/gcc/local-alloc.c +++ b/gcc/local-alloc.c @@ -2286,42 +2286,40 @@ find_free_reg (enum reg_class class, enum machine_mode mode, int qtyno, IOR_COMPL_HARD_REG_SET (first_used, qty_phys_sugg[qtyno]); } - /* If all registers are excluded, we can't do anything. */ - GO_IF_HARD_REG_SUBSET (reg_class_contents[(int) ALL_REGS], first_used, fail); - /* If at least one would be suitable, test each hard reg. */ - - for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) - { + if (!hard_reg_set_subset_p (reg_class_contents[(int) ALL_REGS], first_used)) + for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) + { #ifdef REG_ALLOC_ORDER - int regno = reg_alloc_order[i]; + int regno = reg_alloc_order[i]; #else - int regno = i; + int regno = i; #endif - if (! TEST_HARD_REG_BIT (first_used, regno) - && HARD_REGNO_MODE_OK (regno, mode) - && (qty[qtyno].n_calls_crossed == 0 - || accept_call_clobbered - || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode))) - { - int j; - int size1 = hard_regno_nregs[regno][mode]; - for (j = 1; j < size1 && ! TEST_HARD_REG_BIT (used, regno + j); j++); - if (j == size1) - { - /* Mark that this register is in use between its birth and death - insns. */ - post_mark_life (regno, mode, 1, born_index, dead_index); - return regno; - } + if (!TEST_HARD_REG_BIT (first_used, regno) + && HARD_REGNO_MODE_OK (regno, mode) + && (qty[qtyno].n_calls_crossed == 0 + || accept_call_clobbered + || !HARD_REGNO_CALL_PART_CLOBBERED (regno, mode))) + { + int j; + int size1 = hard_regno_nregs[regno][mode]; + j = 1; + while (j < size1 && !TEST_HARD_REG_BIT (used, regno + j)) + j++; + if (j == size1) + { + /* Mark that this register is in use between its birth + and death insns. */ + post_mark_life (regno, mode, 1, born_index, dead_index); + return regno; + } #ifndef REG_ALLOC_ORDER - /* Skip starting points we know will lose. */ - i += j; + /* Skip starting points we know will lose. */ + i += j; #endif - } - } + } + } - fail: /* If we are just trying suggested register, we have just tried copy- suggested registers, and there are arithmetic-suggested registers, try them. */ |