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| author | Gavin Romig-Koch <gavin@cygnus.com> | 1999-09-17 19:06:50 +0000 |
|---|---|---|
| committer | Gavin Romig-Koch <gavin@gcc.gnu.org> | 1999-09-17 19:06:50 +0000 |
| commit | 05ca5990713469bc7ca0b473c10d9698d688cf6b (patch) | |
| tree | 93d7e32f7fd22847ca013e3c9145338887370baf /gcc | |
| parent | 3f94eee6850c59300cf57e0fe154c8eacefadab1 (diff) | |
| download | gcc-05ca5990713469bc7ca0b473c10d9698d688cf6b.zip gcc-05ca5990713469bc7ca0b473c10d9698d688cf6b.tar.gz gcc-05ca5990713469bc7ca0b473c10d9698d688cf6b.tar.bz2 | |
* fold-const.c (operand_equal_p): Pay attention to side effects.
From-SVN: r29483
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 fcf41bd..4d0035d 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 cddcded..c13b690 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: |