Backport from 2012-06-04 mainline r188172

[pf3gnuchains/gcc-fork.git] / gcc / ipa-pure-const.c

diff --git a/gcc/ipa-pure-const.c b/gcc/ipa-pure-const.c
index 36212cd..e8b21f9 100644 (file)
--- a/gcc/ipa-pure-const.c
+++ b/gcc/ipa-pure-const.c
@@ -437,6 +437,7 @@ special_builtin_state (enum pure_const_state_e *state, bool *looping,
        case BUILT_IN_RETURN:
        case BUILT_IN_UNREACHABLE:
        case BUILT_IN_ALLOCA:
+       case BUILT_IN_ALLOCA_WITH_ALIGN:
        case BUILT_IN_STACK_SAVE:
        case BUILT_IN_STACK_RESTORE:
        case BUILT_IN_EH_POINTER:
@@ -651,7 +652,8 @@ check_stmt (gimple_stmt_iterator *gsip, funct_state local, bool ipa)
       print_gimple_stmt (dump_file, stmt, 0, 0);
     }
 
-  if (gimple_has_volatile_ops (stmt))
+  if (gimple_has_volatile_ops (stmt)
+      && !gimple_clobber_p (stmt))
     {
       local->pure_const_state = IPA_NEITHER;
       if (dump_file)