------- Additional Comments From pinskia at gcc dot gnu dot org 2005-07-12
06:54 -------
4.0 produced:
D.1463 = n - -1073741824;
if (D.1463 >= 0)
Which is wrong as overflow is undefined.
4.1 produces:
(n >= -1073741824)
as overflow is undefined.
This was exposed by:
2005-07-02 Andrew Pinski <[EMAIL PROTECTED]>
PR middle-end/14490
* fold-const.c (fold_binary): Handle the return value of
fold_to_nonsharp_ineq_using_bound if we get back the same operand back.
Implement "X +- C1 CMP C2" folding to "X CMP C2 -+ C1".
Which means I have to look into it since I exposed it. We should be
subtracting using unsigned mode.
--
What |Removed |Added
----------------------------------------------------------------------------
CC| |pinskia at gcc dot gnu dot
| |org
Status|UNCONFIRMED |NEW
Component|c |middle-end
Ever Confirmed| |1
GCC target triplet|i686-pc-linux-gnu |
Keywords| |wrong-code
Known to fail| |4.1.0
Known to work| |4.0.2
Last reconfirmed|0000-00-00 00:00:00 |2005-07-12 06:54:16
date| |
Summary|-1073741824 <= n && n <= |[4.1 Regression] -1073741824
|1073741823 is true where n |<= n && n <= 1073741823 is
|is 1073741824 |true where n is 1073741824
Target Milestone|--- |4.1.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22429
