diff options
| author | rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2010-07-06 13:37:58 +0000 |
|---|---|---|
| committer | rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2010-07-06 13:37:58 +0000 |
| commit | 8822b88567443be7228beb3097b927744a6bad0c (patch) | |
| tree | 416997b33906d5c835be090548d2bc7556824351 /gcc/convert.c | |
| parent | 864a438fb6bab4f861727ba298bfa7ea26232921 (diff) | |
| download | gcc-8822b88567443be7228beb3097b927744a6bad0c.tar.gz | |
2010-07-06 Richard Guenther <rguenther@suse.de>
PR middle-end/44828
* convert.c (convert_to_integer): Watch out for overflowing
MULT_EXPR as well.
* gcc.c-torture/execute/pr44828.c: New testcase.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@161869 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/convert.c')
| -rw-r--r-- | gcc/convert.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/gcc/convert.c b/gcc/convert.c index f54b6d9adfe..5fe4d5712f6 100644 --- a/gcc/convert.c +++ b/gcc/convert.c @@ -768,13 +768,19 @@ convert_to_integer (tree type, tree expr) || ex_form == LSHIFT_EXPR /* If we have !flag_wrapv, and either ARG0 or ARG1 is of a signed type, we have to do - PLUS_EXPR or MINUS_EXPR in an unsigned - type. Otherwise, we would introduce + PLUS_EXPR, MINUS_EXPR or MULT_EXPR in an unsigned + type in case the operation in outprec precision + could overflow. Otherwise, we would introduce signed-overflow undefinedness. */ || ((!TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg0)) || !TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg1))) + && ((TYPE_PRECISION (TREE_TYPE (arg0)) * 2u + > outprec) + || (TYPE_PRECISION (TREE_TYPE (arg1)) * 2u + > outprec)) && (ex_form == PLUS_EXPR - || ex_form == MINUS_EXPR))) + || ex_form == MINUS_EXPR + || ex_form == MULT_EXPR))) typex = unsigned_type_for (typex); else typex = signed_type_for (typex); |