diff options
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 4 | ||||
| -rw-r--r-- | gcc/fold-const.c | 6 |
2 files changed, 10 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index fcf41bdc79f..4d0035dfc8f 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,7 @@ +Fri Sep 17 15:05:27 1999 Gavin Romig-Koch <gavin@cygnus.com> + + * fold-const.c (operand_equal_p): Pay attention to side effects. + Fri Sep 17 11:14:17 1999 Jason Merrill <jason@yorick.cygnus.com> * libgcc2.c (L_exit): Check for ON_EXIT, not HAVE_ON_EXIT. diff --git a/gcc/fold-const.c b/gcc/fold-const.c index cddcded25ee..c13b6908c43 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -2183,6 +2183,12 @@ operand_equal_p (arg0, arg1, only_const) TREE_OPERAND (arg1, 0), 0)); case 'r': + /* If either of the pointer (or reference) expressions we are dereferencing + contain a side effect, these cannot be equal. */ + if (TREE_SIDE_EFFECTS (arg0) + || TREE_SIDE_EFFECTS (arg1)) + return 0; + switch (TREE_CODE (arg0)) { case INDIRECT_REF: |