On 6/19/06, Richard Guenther <[EMAIL PROTECTED]> wrote:
Using -mfpmath=sse -msse2 is a workaround if you have a processor that supports
SSE2 instructions. As opposed to -ffloat-store, it works reliably and
with no performance
impact.
Such slab test can be turned into a branchless sequence of SS
On 6/19/06, Seongbae Park <[EMAIL PROTECTED]> wrote:
On 6/19/06, Dave Korn <[EMAIL PROTECTED]> wrote:
> On 19 June 2006 00:04, Paolo Carlini wrote:
>
> > Zdenek Dvorak wrote:
> >
> >> ... I suspect there is something wrong with your
> >> code (possibly invoking some undefined
On 6/19/06, Dave Korn <[EMAIL PROTECTED]> wrote:
On 19 June 2006 00:04, Paolo Carlini wrote:
> Zdenek Dvorak wrote:
>
>> ... I suspect there is something wrong with your
>> code (possibly invoking some undefined behavior, using uninitialized
>> variable, sensitivity to roundi
On 19 June 2006 00:04, Paolo Carlini wrote:
> Zdenek Dvorak wrote:
>
>> ... I suspect there is something wrong with your
>> code (possibly invoking some undefined behavior, using uninitialized
>> variable, sensitivity to rounding errors, or something like that).
>>
>>
> A da
On 6/18/06, Paolo Carlini <[EMAIL PROTECTED]> wrote:
Zdenek Dvorak wrote:
>... I suspect there is something wrong with your
>code (possibly invoking some undefined behavior, using uninitialized
>variable, sensitivity to rounding errors, or something like that).
>
>
A data poi
Zdenek Dvorak wrote:
... I suspect there is something wrong with your
code (possibly invoking some undefined behavior, using uninitialized
variable, sensitivity to rounding errors, or something like that).
A data point apparently in favor of this suspect is that the "probl
Interestingly this problem doesn't appear with gcc trunk on ppc Darwin
(MacOS X 10.4) using any optimization level (-O, -O0, -O1, -02 or -O3).
It also doesn't appear with Apple's own g++ based on 4.0.1. I can reproduce
the problem with the gcc 4.1.1 from Fedora Core 5 on a dual Xeon though.
Hello,
> This 'little' program behaves bad when compiled with -O. It works fine
> when no -O or -O0 is used.
>
> The function is from Graphics Gem I and has been ported from C to C++
> http://www.acm.org/pubs/tog/GraphicsGems/gems.html#gems
> Woo, Andrew, Fast Ray-Box Intersection, p. 395-396,
minus wrote:
This 'little' program behaves bad when compiled with -O. It works fine
when no -O or -O0 is used.
You need to debug and find out exactly what went wrong. You don't even
know this is a compiler problem yet (lots of user errors in code show
up only if the optimizer is active, e.g. th
This 'little' program behaves bad when compiled with -O. It works fine
when no -O or -O0 is used.
The function is from Graphics Gem I and has been ported from C to C++
http://www.acm.org/pubs/tog/GraphicsGems/gems.html#gems
Woo, Andrew, Fast Ray-Box Intersection, p. 395-396, code: p. 736-737
Th
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