diff options
Diffstat (limited to 'gcc/tree-vrp.c')
| -rw-r--r-- | gcc/tree-vrp.c | 27 |
1 files changed, 22 insertions, 5 deletions
diff --git a/gcc/tree-vrp.c b/gcc/tree-vrp.c index 15498f4..380c17f 100644 --- a/gcc/tree-vrp.c +++ b/gcc/tree-vrp.c @@ -138,7 +138,9 @@ static assert_locus_t *asserts_for; /* Value range array. After propagation, VR_VALUE[I] holds the range of values that SSA name N_I may take. */ +static unsigned num_vr_values; static value_range_t **vr_value; +static bool values_propagated; /* For a PHI node which sets SSA name N_I, VR_COUNTS[I] holds the number of executable edges we saw the last time we visited the @@ -658,6 +660,8 @@ abs_extent_range (value_range_t *vr, tree min, tree max) static value_range_t * get_value_range (const_tree var) { + static const struct value_range_d vr_const_varying + = { VR_VARYING, NULL_TREE, NULL_TREE, NULL }; value_range_t *vr; tree sym; unsigned ver = SSA_NAME_VERSION (var); @@ -666,10 +670,20 @@ get_value_range (const_tree var) if (! vr_value) return NULL; + /* If we query the range for a new SSA name return an unmodifiable VARYING. + We should get here at most from the substitute-and-fold stage which + will never try to change values. */ + if (ver >= num_vr_values) + return CONST_CAST (value_range_t *, &vr_const_varying); + vr = vr_value[ver]; if (vr) return vr; + /* After propagation finished do not allocate new value-ranges. */ + if (values_propagated) + return CONST_CAST (value_range_t *, &vr_const_varying); + /* Create a default value range. */ vr_value[ver] = vr = XCNEW (value_range_t); @@ -3931,7 +3945,7 @@ dump_all_value_ranges (FILE *file) { size_t i; - for (i = 0; i < num_ssa_names; i++) + for (i = 0; i < num_vr_values; i++) { if (vr_value[i]) { @@ -5593,7 +5607,9 @@ vrp_initialize (void) { basic_block bb; - vr_value = XCNEWVEC (value_range_t *, num_ssa_names); + values_propagated = false; + num_vr_values = num_ssa_names; + vr_value = XCNEWVEC (value_range_t *, num_vr_values); vr_phi_edge_counts = XCNEWVEC (int, num_ssa_names); FOR_EACH_BB (bb) @@ -5720,7 +5736,7 @@ vrp_visit_assignment_or_call (gimple stmt, tree *output_p) static inline value_range_t get_vr_for_comparison (int i) { - value_range_t vr = *(vr_value[i]); + value_range_t vr = *get_value_range (ssa_name (i)); /* If name N_i does not have a valid range, use N_i as its own range. This allows us to compare against names that may @@ -7700,7 +7716,8 @@ static void vrp_finalize (void) { size_t i; - unsigned num = num_ssa_names; + + values_propagated = true; if (dump_file) { @@ -7720,7 +7737,7 @@ vrp_finalize (void) identify_jump_threads (); /* Free allocated memory. */ - for (i = 0; i < num; i++) + for (i = 0; i < num_vr_values; i++) if (vr_value[i]) { BITMAP_FREE (vr_value[i]->equiv); |