qsimd_p.h File Reference

#include <qglobal.h>

Go to the source code of this file.

Macros
#define	ALIGNMENT_PROLOGUE_16BYTES(ptr, i, length)   for (; i < static_cast<int>(qMin(static_cast<quintptr>(length), ((4 - ((reinterpret_cast<quintptr>(ptr) >> 2) & 0x3)) & 0x3))); ++i)

Enumerations
enum	CPUFeatures {   None = 0, MMX = 0x1, MMXEXT = 0x2, MMX3DNOW = 0x4,   MMX3DNOWEXT = 0x8, SSE = 0x10, SSE2 = 0x20, CMOV = 0x40,   IWMMXT = 0x80, NEON = 0x100, SSE3 = 0x200, SSSE3 = 0x400,   SSE4_1 = 0x800, SSE4_2 = 0x1000, AVX = 0x2000 }

Functions
Q_CORE_EXPORT uint	qDetectCPUFeatures ()

Macro Definition Documentation

ALIGNMENT_PROLOGUE_16BYTES

#define ALIGNMENT_PROLOGUE_16BYTES	(		ptr,
			i,
			length
	)		for (; i < static_cast<int>(qMin(static_cast<quintptr>(length), ((4 - ((reinterpret_cast<quintptr>(ptr) >> 2) & 0x3)) & 0x3))); ++i)

Definition at line 231 of file qsimd_p.h.

Enumeration Type Documentation

CPUFeatures

enum CPUFeatures

Enumerator
None
MMX
MMXEXT
MMX3DNOW
MMX3DNOWEXT
SSE
SSE2
CMOV
IWMMXT
NEON
SSE3
SSSE3
SSE4_1
SSE4_2
AVX

Definition at line 210 of file qsimd_p.h.

                 {
    None        = 0,
    MMX         = 0x1,
    MMXEXT      = 0x2,
    MMX3DNOW    = 0x4,
    MMX3DNOWEXT = 0x8,
    SSE         = 0x10,
    SSE2        = 0x20,
    CMOV        = 0x40,
    IWMMXT      = 0x80,
    NEON        = 0x100,
    SSE3        = 0x200,
    SSSE3       = 0x400,
    SSE4_1      = 0x800,
    SSE4_2      = 0x1000,
    AVX         = 0x2000
};

Function Documentation

qDetectCPUFeatures()

Q_CORE_EXPORT 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;
}