Hi,
I’m trying to enable hard float computation on arm.
I think I have managed to enable it doing the following changes:
1) Set a new environment var ANDROID_ARCH_TARGET=armeabi-v7a-hard
2) Adding
equals(ANDROID_TARGET_ARCH, armeabi-v7a-hard): \
QMAKE_CFLAGS = -Wno-psabi -march=armv7-a -mf
2016-04-29 10:11 GMT+02:00 Nuno Santos :
>
> Code compiled and ruined fine but couldn’t notice a faster performance (I
> have profiling timers in critical parts of the application).
>
> Has anyone done this before?
>
>
As far as I know Qt is built with qreal as double as a default setting.
In cas
Ola,
Thanks for your reply.
While Qt code may be compiled with support for hard float, the qmake.specs file
for android doesn’t show that and, in general, it seems that hard float support
is disabled by default in android:
QMAKE_CFLAGS = -Wno-psabi -march=armv7-a -mfloat-abi=softfp -mfpu=vfp
On Fri, Apr 29, 2016 at 1:55 PM, Ola Røer Thorsen
wrote:
>
> float a = 1.0f;
> float b = 2.0*a; // BAD!
> float b = 2.0f*a; // Good!
>
Pretty sure that this would be a non-problem starting at -O1 optimization
level.
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On sexta-feira, 29 de abril de 2016 13:55:05 PDT Ola Røer Thorsen wrote:
> As far as I know Qt is built with qreal as double as a default setting.
qreal is double.
--
Thiago Macieira - thiago.macieira (AT) intel.com
Software Architect - Intel Open Source Technology Center
On sexta-feira, 29 de abril de 2016 14:59:35 PDT Nuno Santos wrote:
> While Qt code may be compiled with support for hard float, the qmake.specs
> file for android doesn’t show that and, in general, it seems that hard
> float support is disabled by default in android:
Unless you're recompiling ALL
Thiago,
> On 29 Apr 2016, at 17:12, Thiago Macieira wrote:
>
> So I have to ask:
> a) are you sure your system wasn't already hard-float?
I don’t have a clue
> b) if it wasn't, are the hard-float libs for EVERYTHING available on the
> system? And does the lib loader know how to find them?
2016-04-29 16:36 GMT+02:00 Jean-Michaël Celerier <
jeanmichael.celer...@gmail.com>:
>
> On Fri, Apr 29, 2016 at 1:55 PM, Ola Røer Thorsen
> wrote:
>
>>
>> float a = 1.0f;
>> float b = 2.0*a; // BAD!
>> float b = 2.0f*a; // Good!
>>
>
> Pretty sure that this would be a non-problem starting at -O1
On sexta-feira, 29 de abril de 2016 17:19:03 PDT Nuno Santos wrote:
> > So I have to ask:
> > a) are you sure your system wasn't already hard-float?
>
> I don’t have a clue
>
> > b) if it wasn't, are the hard-float libs for EVERYTHING available on the
> >
> > system? And does the lib loader kn
Ok Thiago, many thanks!
> On 29 Apr 2016, at 17:35, Thiago Macieira wrote:
>
> On sexta-feira, 29 de abril de 2016 17:19:03 PDT Nuno Santos wrote:
>>> So I have to ask:
>>> a) are you sure your system wasn't already hard-float?
>>
>> I don’t have a clue
>>
>>> b) if it wasn't, are the hard-fl
https://godbolt.org/g/DqBlFG
With gcc -O1
float f(float x)
{
return 2. * x;
}
becomes
f(float):
addss %xmm0, %xmm0
ret
and
float g (float x)
{
return 2.f * x;
}
becomes
g(float):
addss %xmm0, %xmm0
ret
On Fri, Apr 29, 2016 at 6:30 PM, Ola Røer Thor
2016-04-30 10:46 GMT+02:00 Jean-Michaël Celerier <
jeanmichael.celer...@gmail.com>:
> https://godbolt.org/g/DqBlFG
>
> With gcc -O1
>
> float f(float x)
> {
> return 2. * x;
> }
>
> becomes
>
> f(float):
> addss %xmm0, %xmm0
> ret
>
>
> and
>
> float g (float x)
> {
> return
2016-04-30 11:51 GMT+02:00 Ola Røer Thorsen :
>
> 2016-04-30 10:46 GMT+02:00 Jean-Michaël Celerier
> :
>>
>> https://godbolt.org/g/DqBlFG
>>
>> With gcc -O1
>>
>> float f(float x)
>> {
>> return 2. * x;
>> }
>>
>> becomes
>>
>> f(float):
>> addss %xmm0, %xmm0
>> ret
>>
>>
>> and
On sábado, 30 de abril de 2016 10:46:21 PDT Jean-Michaël Celerier wrote:
> https://godbolt.org/g/DqBlFG
>
> With gcc -O1
>
> float f(float x)
> {
> return 2. * x;
> }
>
> becomes
>
> f(float):
> addss %xmm0, %xmm0
> ret
>
>
> and
>
> float g (float x)
> {
> return 2.f *
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