Hi,
Status update.....
On Wed, Jan 04, 2012 at 05:29:35PM +0100, Harry van der Wolf wrote:
> On my (main) Mac OS X 64bit machine a straightforward compilation
> with g++ 4.2.1 and optimisation -O3, delivering a 64bit binary,
> works fine as well.
I have tried it on ubuntu Natty (gcc-4.4), and found that I can get it
to crash at -O3 level on my test data.
I have confirmation from Carlos that it crashes on his system in
the same function as on mine.
It is around line 100 of maskpyramids.cpp
pixel=input[p++];
by the time it crashes p has the value 120thousand. In a normal run I
normally see p run up to 7 or 8, but never higher. I haven't checked
this, just by hand. OK. checked: It does occasionally go above 10, but
never over 20.
So apparently the loop isn't terminating when it should....
Code inspection has learned that (the line before the crash):
while (readmore>0) {
could just as well read:
while (1) {
because readmore can never be assigned a value other than 1, 2 or
three.
The exit from the loop will be caused by a "break" statement in the
loop.
(To be sure: The problem can be inside this function, (compilation or
the code, but it could just as well be somewhere else and that this
crashes because it gets wrong data. )
My debugging code shows it goes weird on the first call with inwidth
!= 14917.
....
inwidth=14917
inwidth=14917
inwidth=7459
readmore=1, p=21, readsofar = 22383
inwidth=7459
Even when I abort the loop at p==21, it crashes eventually.
Roger.
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