qsimd.cpp File Reference

#include "qsimd_p.h"
#include <QByteArray>
#include <stdio.h>
#include <windows.h>

Go to the source code of this file.

Functions
static uint	detectProcessorFeatures ()
uint	qDetectCPUFeatures ()
void	qDumpCPUFeatures ()

Variables
const int	features_count = (sizeof features_indices - 1) / (sizeof features_indices[0])
static const int	features_indices []
static const char	features_string []

Function Documentation

detectProcessorFeatures()

static uint detectProcessorFeatures ( )

inlinestatic

Definition at line 81 of file qsimd.cpp.

Referenced by qDetectCPUFeatures().

{
    uint features = 0;

#if defined (ARM)
    if (IsProcessorFeaturePresent(PF_ARM_INTEL_WMMX)) {
        features = IWMMXT;
        return features;
    }
#elif defined(_X86_)
    features = 0;
#if defined QT_HAVE_MMX
    if (IsProcessorFeaturePresent(PF_MMX_INSTRUCTIONS_AVAILABLE))
        features |= MMX;
#endif
#if defined QT_HAVE_3DNOW
    if (IsProcessorFeaturePresent(PF_3DNOW_INSTRUCTIONS_AVAILABLE))
        features |= MMX3DNOW;
#endif
    return features;
#endif
    features = 0;
    return features;
}

qDetectCPUFeatures()

uint qDetectCPUFeatures

(

)

Definition at line 382 of file qsimd.cpp.

Referenced by qDumpCPUFeatures(), qInitDrawhelperAsm(), qInitImageConversions(), and QJpegHandler::QJpegHandler().

{
    static QBasicAtomicInt features = Q_BASIC_ATOMIC_INITIALIZER(-1);
    if (features != -1)
        return features;

    uint f = detectProcessorFeatures();
    QByteArray disable = qgetenv("QT_NO_CPU_FEATURE");
    if (!disable.isEmpty()) {
        disable.prepend(' ');
        for (int i = 0; i < features_count; ++i) {
            if (disable.contains(features_string + features_indices[i]))
                f &= ~(1 << i);
        }
    }

    features = f;
    return features;
}

qDumpCPUFeatures()

void qDumpCPUFeatures

(

)

Definition at line 402 of file qsimd.cpp.

Referenced by QLibraryInfo::location().

{
    uint features = qDetectCPUFeatures();
    printf("Processor features: ");
    for (int i = 0; i < features_count; ++i) {
        if (features & (1 << i))
            printf("%s", features_string + features_indices[i]);
    }
    puts("");
}

Variable Documentation

features_count

const int features_count = (sizeof features_indices - 1) / (sizeof features_indices[0])

Definition at line 380 of file qsimd.cpp.

Referenced by qDetectCPUFeatures(), and qDumpCPUFeatures().

features_indices

const int features_indices[]

static

Initial value:

= {
       0,    5,   13,   23,   36,   41,   47,   53,
      61,   67,   73,   80,   88,   96,   -1
}

Definition at line 374 of file qsimd.cpp.

Referenced by qDetectCPUFeatures(), and qDumpCPUFeatures().

features_string

const char features_string[]

static

Initial value:

=
    " mmx\0"
    " mmxext\0"
    " mmx3dnow\0"
    " mmx3dnowext\0"
    " sse\0"
    " sse2\0"
    " cmov\0"
    " iwmmxt\0"
    " neon\0"
    " sse3\0"
    " ssse3\0"
    " sse4.1\0"
    " sse4.2\0"
    " avx\0"
    "\0"

Definition at line 357 of file qsimd.cpp.

Referenced by qDetectCPUFeatures(), and qDumpCPUFeatures().