Author: pluto Date: Thu Aug 4 22:55:40 2005 GMT
Module: SOURCES Tag: HEAD
---- Log message:
- patch partially merged into mainline.
---- Files affected:
SOURCES:
gcc-pr23128.patch (NONE -> 1.1) (NEW), gcc-pr23128_23129.patch (1.1 ->
NONE) (REMOVED)
---- Diffs:
================================================================
Index: SOURCES/gcc-pr23128.patch
diff -u /dev/null SOURCES/gcc-pr23128.patch:1.1
--- /dev/null Fri Aug 5 00:55:40 2005
+++ SOURCES/gcc-pr23128.patch Fri Aug 5 00:55:35 2005
@@ -0,0 +1,68 @@
+--- gcc/gcc/tree-vrp.c 29 Jul 2005 15:21:54 -0000 2.47
++++ gcc/gcc/tree-vrp.c 30 Jul 2005 18:10:26 -0000
+@@ -908,7 +908,7 @@ vrp_int_const_binop (enum tree_code code
+ {
+ tree res;
+
+- if (flag_wrapv)
++ if (flag_wrapv || TYPE_UNSIGNED (TREE_TYPE (val1)))
+ return int_const_binop (code, val1, val2, 0);
+
+ /* If we are not using wrapping arithmetic, operate symbolically
+@@ -1095,6 +1095,22 @@ extract_range_from_binary_expr (value_ra
+ the same end of each range. */
+ min = vrp_int_const_binop (code, vr0.min, vr1.min);
+ max = vrp_int_const_binop (code, vr0.max, vr1.max);
++
++ /* Check for possible unsigned wrapping. */
++ if (code == PLUS_EXPR && TYPE_UNSIGNED (TREE_TYPE (expr)))
++ {
++ tree res0 = fold_binary_to_constant (GT_EXPR, TREE_TYPE (expr),
++ vr0.max, max);
++ tree res1 = fold_binary_to_constant (GT_EXPR, TREE_TYPE (expr),
++ vr1.max, max);
++
++ if ((res0 && integer_onep (res0))
++ || (res1 && integer_onep (res1)))
++ {
++ set_value_range_to_varying (vr);
++ return;
++ }
++ }
+ }
+ else if (code == MULT_EXPR
+ || code == TRUNC_DIV_EXPR
+@@ -1204,6 +1221,22 @@ extract_range_from_binary_expr (value_ra
+ each range. */
+ min = vrp_int_const_binop (code, vr0.min, vr1.max);
+ max = vrp_int_const_binop (code, vr0.max, vr1.min);
++
++ /* Check for possible unsigned wrapping. */
++ if (TYPE_UNSIGNED (TREE_TYPE (expr)))
++ {
++ tree res0 = fold_binary_to_constant (LT_EXPR, TREE_TYPE (expr),
++ vr0.min, min);
++ tree res1 = fold_binary_to_constant (GT_EXPR, TREE_TYPE (expr),
++ vr1.max, max);
++
++ if ((res0 && integer_onep (res0))
++ || (res1 && integer_onep (res1)))
++ {
++ set_value_range_to_varying (vr);
++ return;
++ }
++ }
+ }
+ else
+ gcc_unreachable ();
+@@ -1677,6 +1710,10 @@ compare_ranges (enum tree_code comp, val
+ else if (cmp_min != -2 && cmp_max != -2)
+ return boolean_false_node;
+ }
++ /* If [V0_MIN, V1_MAX] < [V1_MIN, V1_MAX] then V0 != V1. */
++ else if (compare_values (vr0->min, vr1->max) == 1
++ || compare_values (vr1->min, vr0->max) == 1)
++ return boolean_false_node;
+
+ return NULL_TREE;
+ }
================================================================
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