+2006-11-24 Andrew Pinski <andrew_pinski@playstation.sony.com>
+
+ PR tree-opt/29964
+ * ipa-pure-const.c (check_tree): If the original tree
+ is volatile return early and say the function is not pure
+ nor const. Remove the volatile check for writes.
+ (analyze_function): Print out the result of the local
+ analysis pass.
+
2006-11-24 Joseph Myers <joseph@codesourcery.com>
* config/rs6000/eabispe.h (TARGET_DEFAULT): Include
if ((TREE_CODE (t) == EXC_PTR_EXPR) || (TREE_CODE (t) == FILTER_EXPR))
return;
+ /* Any tree which is volatile disqualifies thie function from being
+ const or pure. */
+ if (TREE_THIS_VOLATILE (t))
+ {
+ local->pure_const_state = IPA_NEITHER;
+ return;
+ }
+
while (TREE_CODE (t) == REALPART_EXPR
|| TREE_CODE (t) == IMAGPART_EXPR
|| handled_component_p (t))
/* Any indirect reference that occurs on the lhs
disqualifies the function from being pure or const. Any
- indirect reference to a volatile disqualifies the
- function from being pure or const. Any indirect
- reference that occurs on the rhs disqualifies the
+ indirect reference that occurs on the rhs disqualifies the
function from being const. */
- if (checking_write || TREE_THIS_VOLATILE (t))
- local->pure_const_state = IPA_NEITHER;
+ if (checking_write)
+ {
+ local->pure_const_state = IPA_NEITHER;
+ return;
+ }
else if (local->pure_const_state == IPA_CONST)
local->pure_const_state = IPA_PURE;
}
walk_tree (bsi_stmt_ptr (bsi), scan_function,
fn, visited_nodes);
if (l->pure_const_state == IPA_NEITHER)
- return;
+ goto end;
}
}
pop_cfun ();
}
}
+
+end:
+ if (dump_file)
+ {
+ fprintf (dump_file, "after local analysis of %s with initial value = %d\n ",
+ cgraph_node_name (fn),
+ l->pure_const_state);
+ }
}
\f
+2006-11-24 Andrew Pinski <andrew_pinski@playstation.sony.com>
+
+ PR tree-opt/29964
+ * gcc.dg/pure-1.c: New test.
+
2006-11-24 Joseph Myers <joseph@codesourcery.com>
* g++.dg/eh/simd-2.C: Use -O -w in general for PowerPC.
--- /dev/null
+/* Regression test for PR middle-end/23584 */
+/* Verify that dereferencing a volatile element in a struct causes
+ the function not be pure. */
+
+/* { dg-do compile } */
+/* { dg-options "-O1 -fdump-ipa-pure-const" } */
+
+struct test_a { volatile int a; };
+
+int func_a(struct test_a *a)
+{
+ return a->a;
+}
+
+/* { dg-final { scan-ipa-dump-not "found to be pure: func_a" "pure-const" } } */
+/* { dg-final { cleanup-ipa-dump "pure-const" } } */