+2007-06-21 Sebastian Pop <sebpop@gmail.com>
+
+ PR tree-optimization/19590
+ * tree-vrp.c (adjust_range_with_scev): Set the range when the result
+ of scev is a constant.
+ * gcc/testsuite/gcc.dg/tree-ssa/pr19590.c: New.
+
2007-06-21 Kenneth Zadeck <zadeck@naturalbridge.com>
* df-problems.c (df_note_bb_compute): Made computation of live
--- /dev/null
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-ivopts" } */
+
+void vnum_test8(int *data)
+{
+ int i;
+ int stop = data[3];
+ int m = data[4];
+ int n = m;
+ for (i=1; i<stop; i++) {
+ int k = data[2];
+ data[k] = 2;
+ data[0] = m - n;
+ k = data[1];
+ m = m + k;
+ n = n + k;
+ }
+}
+
+/* Using the SCEV analysis, this loop should be transformed to:
+
+ | void vnum_result8(int *data)
+ |{
+ | int i;
+ | int stop = data[3];
+ | for (i=1; i<stop; i++) {
+ | int k = data[2];
+ | data[k] = 2;
+ | data[0] = 0;
+ | }
+ |}
+
+*/
+
+/* { dg-final { scan-tree-dump-times "= 0;" 1 "ivopts"} } */
+/* { dg-final { scan-tree-dump-times "= 2;" 1 "ivopts"} } */
+/* { dg-final { cleanup-tree-dump "ivopts" } } */
return;
chrec = instantiate_parameters (loop, analyze_scalar_evolution (loop, var));
+
+ /* Like in PR19590, scev can return a constant function. */
+ if (is_gimple_min_invariant (chrec))
+ {
+ set_value_range (vr, VR_RANGE, chrec, chrec, vr->equiv);
+ return;
+ }
+
if (TREE_CODE (chrec) != POLYNOMIAL_CHREC)
return;