diff options
Diffstat (limited to 'gcc/lra.c')
| -rw-r--r-- | gcc/lra.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/gcc/lra.c b/gcc/lra.c index a29266e7ecc..f4d7a3c071f 100644 --- a/gcc/lra.c +++ b/gcc/lra.c @@ -2180,6 +2180,10 @@ int lra_new_regno_start; /* Start of reload pseudo regnos before the new spill pass. */ int lra_constraint_new_regno_start; +/* Avoid spilling pseudos with regno more than the following value if + it is possible. */ +int lra_bad_spill_regno_start; + /* Inheritance pseudo regnos before the new spill pass. */ bitmap_head lra_inheritance_pseudos; @@ -2269,6 +2273,7 @@ lra (FILE *f) permit changing reg classes for pseudos created by this simplification. */ lra_constraint_new_regno_start = lra_new_regno_start = max_reg_num (); + lra_bad_spill_regno_start = INT_MAX; remove_scratches (); scratch_p = lra_constraint_new_regno_start != max_reg_num (); @@ -2406,12 +2411,14 @@ lra (FILE *f) /* Assignment of stack slots changes elimination offsets for some eliminations. So update the offsets here. */ lra_eliminate (false, false); - /* After switching off inheritance and rematerialization passes, - don't forget reload pseudos after spilling sub-pass to avoid - LRA cycling in some complicated cases. */ - if (lra_inheritance_iter <= LRA_MAX_INHERITANCE_PASSES - || lra_rematerialization_iter <= LRA_MAX_REMATERIALIZATION_PASSES) - lra_constraint_new_regno_start = max_reg_num (); + lra_constraint_new_regno_start = max_reg_num (); + if (lra_bad_spill_regno_start == INT_MAX + && lra_inheritance_iter > LRA_MAX_INHERITANCE_PASSES + && lra_rematerialization_iter > LRA_MAX_REMATERIALIZATION_PASSES) + /* After switching off inheritance and rematerialization + passes, avoid spilling reload pseudos will be created to + prevent LRA cycling in some complicated cases. */ + lra_bad_spill_regno_start = lra_constraint_new_regno_start; lra_assignment_iter_after_spill = 0; } restore_scratches (); |