diff options
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/tree-vrp.c | 56 |
2 files changed, 49 insertions, 13 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 615f13d..b963ad6 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2006-12-06 Jan Hubicka <jh@suse.cz> + + * tree-vrp.c (operand_less_p): New. + (compare_values, value_inside_range): Rewrite in terms of + operand_less_p. + 2006-12-06 Uros Bizjak <ubizjak@gmail.com> * config/i386/i386.md (DIRFLAG_REG): Remove constant. diff --git a/gcc/tree-vrp.c b/gcc/tree-vrp.c index bbbaa5b..908f22b 100644 --- a/gcc/tree-vrp.c +++ b/gcc/tree-vrp.c @@ -442,6 +442,29 @@ valid_value_p (tree expr) return is_gimple_min_invariant (expr); } +/* Return + 1 if VAL < VAL2 + 0 if !(VAL < VAL2) + -2 if those are incomparable. */ +static inline int +operand_less_p (tree val, tree val2) +{ + tree tcmp; + /* LT is folded faster than GE and others. Inline the common case. */ + if (TREE_CODE (val) == INTEGER_CST && TREE_CODE (val2) == INTEGER_CST) + { + if (TYPE_UNSIGNED (TREE_TYPE (val))) + return INT_CST_LT_UNSIGNED (val, val2); + else + return INT_CST_LT (val, val2); + } + else + tcmp = fold_binary_to_constant (LT_EXPR, boolean_type_node, val, val2); + if (!tcmp) + return -2; + return !integer_zerop (tcmp); +} + /* Compare two values VAL1 and VAL2. Return -2 if VAL1 and VAL2 cannot be compared at compile-time, @@ -590,13 +613,11 @@ compare_values (tree val1, tree val2) return 0; /* If VAL1 is a lower address than VAL2, return -1. */ - t = fold_binary (LT_EXPR, boolean_type_node, val1, val2); - if (t == boolean_true_node) + if (operand_less_p (val1, val2) == 1) return -1; /* If VAL1 is a higher address than VAL2, return +1. */ - t = fold_binary (GT_EXPR, boolean_type_node, val1, val2); - if (t == boolean_true_node) + if (operand_less_p (val2, val1) == 1) return 1; /* If VAL1 is different than VAL2, return +2. */ @@ -627,27 +648,36 @@ compare_values (tree val1, tree val2) This also applies to value_ranges_intersect_p and range_includes_zero_p. The semantics of VR_RANGE and VR_ANTI_RANGE should be encoded here, but that also means - adapting the users of these functions to the new semantics. */ + adapting the users of these functions to the new semantics. + + Benchmark compile/20001226-1.c compilation time after changing this + function. */ static inline int -value_inside_range (tree val, value_range_t *vr) +value_inside_range (tree val, value_range_t * vr) { - tree cmp1, cmp2; + int cmp1, cmp2; - cmp1 = fold_binary_to_constant (GE_EXPR, boolean_type_node, val, vr->min); - if (!cmp1) + cmp1 = operand_less_p (val, vr->min); + if (cmp1 == -2) return -2; + if (cmp1 == 1) + return 0; - cmp2 = fold_binary_to_constant (LE_EXPR, boolean_type_node, val, vr->max); - if (!cmp2) + cmp2 = operand_less_p (vr->max, val); + if (cmp2 == -2) return -2; - return cmp1 == boolean_true_node && cmp2 == boolean_true_node; + return !cmp2; } /* Return true if value ranges VR0 and VR1 have a non-empty - intersection. */ + intersection. + + Benchmark compile/20001226-1.c compilation time after changing this + function. + */ static inline bool value_ranges_intersect_p (value_range_t *vr0, value_range_t *vr1) |