new file mode 100644
@@ -0,0 +1,13 @@
+/* { dg-do compile } */
+/* { dg-options "-O -fdump-tree-ccp1" } */
+
+int
+test(int* a, int* b)
+{
+ __INTPTR_TYPE__ delta = (int*)__builtin_assume_aligned(b, 32)
+ - (int*)__builtin_assume_aligned(a, 32);
+ __INTPTR_TYPE__ x = delta % 8;
+ return (x == 0);
+}
+
+/* { dg-final { scan-tree-dump "return 1;" "ccp1" } } */
@@ -1921,6 +1921,27 @@ bit_value_binop (enum tree_code code, signop sgn, int width,
{
widest_int r1max = r1val | r1mask;
widest_int r2max = r2val | r2mask;
+ if (r2mask == 0)
+ {
+ widest_int shift = wi::exact_log2 (r2val);
+ if (shift != -1)
+ {
+ // Handle modulo by a power of 2 as a bitwise and.
+ widest_int tem_val, tem_mask;
+ bit_value_binop (BIT_AND_EXPR, sgn, width, &tem_val, &tem_mask,
+ r1type_sgn, r1type_precision, r1val, r1mask,
+ r2type_sgn, r2type_precision,
+ r2val - 1, r2mask);
+ if (sgn == UNSIGNED
+ || !wi::neg_p (r1max)
+ || (tem_mask == 0 && tem_val == 0))
+ {
+ *val = tem_val;
+ *mask = tem_mask;
+ return;
+ }
+ }
+ }
if (sgn == UNSIGNED
|| (!wi::neg_p (r1max) && !wi::neg_p (r2max)))
{
@@ -1949,11 +1970,15 @@ bit_value_binop (enum tree_code code, signop sgn, int width,
}
break;
+ case EXACT_DIV_EXPR:
case TRUNC_DIV_EXPR:
{
widest_int r1max = r1val | r1mask;
widest_int r2max = r2val | r2mask;
- if (r2mask == 0 && !wi::neg_p (r1max))
+ if (r2mask == 0
+ && (code == EXACT_DIV_EXPR
+ || sgn == UNSIGNED
+ || !wi::neg_p (r1max)))
{
widest_int shift = wi::exact_log2 (r2val);
if (shift != -1)