When comparing the return value of two functions (which both return double and
do always return the same value), I have the case that (a < b) && (b < a)
(whereby they should be equal) in a real world application.
I tried to reproduce it, though in the test case, I have a slightly different
case, which should be also wrong: !(a < b) && (b > a) is true (whereby it
should be a == b).
Probably both problems are related.
The behaviour pretty much depend on the optimisation. With -O0 and -Os, I am
hitting the problem, but not so with -O1, -O2 and -O3.
--
Summary: floating point comparision works wrong ( !(a < b) && (b
> a) is true )
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: ich at az2000 dot de
GCC build triplet: tried with GCC 4.1.2, 4.3.2 and 4.4.0
GCC host triplet: Gentoo Linux i386
GCC target triplet: Linux i386
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40186
