diff options
Diffstat (limited to 'gcc/tree-ssa-reassoc.c')
| -rw-r--r-- | gcc/tree-ssa-reassoc.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/gcc/tree-ssa-reassoc.c b/gcc/tree-ssa-reassoc.c index 5f7c6b721d8..cf05de5be71 100644 --- a/gcc/tree-ssa-reassoc.c +++ b/gcc/tree-ssa-reassoc.c @@ -467,6 +467,8 @@ eliminate_duplicate_pair (enum tree_code opcode, return false; } +static VEC(tree, heap) *plus_negates; + /* If OPCODE is PLUS_EXPR, CURR->OP is really a negate expression, look in OPS for a corresponding positive operation to cancel it out. If we find one, remove the other from OPS, replace @@ -521,6 +523,10 @@ eliminate_plus_minus_pair (enum tree_code opcode, } } + /* CURR->OP is a negate expr in a plus expr: save it for later + inspection in repropagate_negates(). */ + VEC_safe_push (tree, heap, plus_negates, curr->op); + return false; } @@ -1500,8 +1506,6 @@ get_single_immediate_use (tree lhs) return NULL; } -static VEC(tree, heap) *broken_up_subtracts; - /* Recursively negate the value of TONEGATE, and return the SSA_NAME representing the negated value. Insertions of any necessary instructions go before GSI. @@ -1544,7 +1548,6 @@ negate_value (tree tonegate, gimple_stmt_iterator *gsi) tonegate = fold_build1 (NEGATE_EXPR, TREE_TYPE (tonegate), tonegate); resultofnegate = force_gimple_operand_gsi (gsi, tonegate, true, NULL_TREE, true, GSI_SAME_STMT); - VEC_safe_push (tree, heap, broken_up_subtracts, resultofnegate); return resultofnegate; } @@ -1700,7 +1703,7 @@ repropagate_negates (void) unsigned int i = 0; tree negate; - for (i = 0; VEC_iterate (tree, broken_up_subtracts, i, negate); i++) + for (i = 0; VEC_iterate (tree, plus_negates, i, negate); i++) { gimple user = get_single_immediate_use (negate); @@ -2014,7 +2017,7 @@ init_reassoc (void) free (bbs); calculate_dominance_info (CDI_POST_DOMINATORS); - broken_up_subtracts = NULL; + plus_negates = NULL; } /* Cleanup after the reassociation pass, and print stats if @@ -2035,7 +2038,7 @@ fini_reassoc (void) pointer_map_destroy (operand_rank); free_alloc_pool (operand_entry_pool); free (bb_rank); - VEC_free (tree, heap, broken_up_subtracts); + VEC_free (tree, heap, plus_negates); free_dominance_info (CDI_POST_DOMINATORS); loop_optimizer_finalize (); } |