diff options
Diffstat (limited to 'gcc/tree-ssanames.c')
| -rw-r--r-- | gcc/tree-ssanames.c | 47 |
1 files changed, 41 insertions, 6 deletions
diff --git a/gcc/tree-ssanames.c b/gcc/tree-ssanames.c index e83dd469846..676c806c622 100644 --- a/gcc/tree-ssanames.c +++ b/gcc/tree-ssanames.c @@ -320,11 +320,14 @@ make_ssa_name_fn (struct function *fn, tree var, gimple *stmt, return t; } -/* Store range information RANGE_TYPE, MIN, and MAX to tree ssa_name NAME. */ +/* Helper function for set_range_info. + + Store range information RANGE_TYPE, MIN, and MAX to tree ssa_name + NAME. */ void -set_range_info (tree name, enum value_range_type range_type, - const wide_int_ref &min, const wide_int_ref &max) +set_range_info_raw (tree name, enum value_range_type range_type, + const wide_int_ref &min, const wide_int_ref &max) { gcc_assert (!POINTER_TYPE_P (TREE_TYPE (name))); gcc_assert (range_type == VR_RANGE || range_type == VR_ANTI_RANGE); @@ -360,6 +363,34 @@ set_range_info (tree name, enum value_range_type range_type, } } +/* Store range information RANGE_TYPE, MIN, and MAX to tree ssa_name + NAME while making sure we don't store useless range info. */ + +void +set_range_info (tree name, enum value_range_type range_type, + const wide_int_ref &min, const wide_int_ref &max) +{ + gcc_assert (!POINTER_TYPE_P (TREE_TYPE (name))); + + /* A range of the entire domain is really no range at all. */ + tree type = TREE_TYPE (name); + if (min == wi::min_value (TYPE_PRECISION (type), TYPE_SIGN (type)) + && max == wi::max_value (TYPE_PRECISION (type), TYPE_SIGN (type))) + { + range_info_def *ri = SSA_NAME_RANGE_INFO (name); + if (ri == NULL) + return; + if (ri->get_nonzero_bits () == -1) + { + ggc_free (ri); + SSA_NAME_RANGE_INFO (name) = NULL; + return; + } + } + + set_range_info_raw (name, range_type, min, max); +} + /* Gets range information MIN, MAX and returns enum value_range_type corresponding to tree ssa_name NAME. enum value_range_type returned @@ -419,9 +450,13 @@ set_nonzero_bits (tree name, const wide_int_ref &mask) { gcc_assert (!POINTER_TYPE_P (TREE_TYPE (name))); if (SSA_NAME_RANGE_INFO (name) == NULL) - set_range_info (name, VR_RANGE, - TYPE_MIN_VALUE (TREE_TYPE (name)), - TYPE_MAX_VALUE (TREE_TYPE (name))); + { + if (mask == -1) + return; + set_range_info_raw (name, VR_RANGE, + TYPE_MIN_VALUE (TREE_TYPE (name)), + TYPE_MAX_VALUE (TREE_TYPE (name))); + } range_info_def *ri = SSA_NAME_RANGE_INFO (name); ri->set_nonzero_bits (mask); } |