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QQuaternion: perform some operations in memory order

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The order of member variables is wp, xp, yp, zp. When performing
operations that touch all members, do so in declaration (=memory)
order.

Might enable autovectorization. Probably leads to slightly
better cache behavior.

Change-Id: Id9541e5a8011c349f5d24c5e9322bb232a7607b6
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Marc Mutz 2015-04-20 22:10:33 +02:00
parent 84770d6375
commit 596e157d3c
1 changed files with 14 additions and 14 deletions
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28
src/gui/math3d/qquaternion.h
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@ -164,12 +164,12 @@ inline QQuaternion::QQuaternion(float aScalar, float xpos, float ypos, float zpo
inline bool QQuaternion::isNull() const
{
return xp == 0.0f && yp == 0.0f && zp == 0.0f && wp == 0.0f;
return wp == 0.0f && xp == 0.0f && yp == 0.0f && zp == 0.0f;
}
inline bool QQuaternion::isIdentity() const
{
return xp == 0.0f && yp == 0.0f && zp == 0.0f && wp == 1.0f;
return wp == 1.0f && xp == 0.0f && yp == 0.0f && zp == 0.0f;
}
inline float QQuaternion::x() const { return xp; }
@ -184,16 +184,16 @@ inline void QQuaternion::setScalar(float aScalar) { wp = aScalar; }
Q_DECL_CONSTEXPR inline float QQuaternion::dotProduct(const QQuaternion &q1, const QQuaternion &q2)
{
return q1.xp * q2.xp + q1.yp * q2.yp + q1.zp * q2.zp + q1.wp * q2.wp;
return q1.wp * q2.wp + q1.xp * q2.xp + q1.yp * q2.yp + q1.zp * q2.zp;
}
inline QQuaternion QQuaternion::inverted() const
{
// Need some extra precision if the length is very small.
double len = double(xp) * double(xp) +
double len = double(wp) * double(wp) +
double(xp) * double(xp) +
double(yp) * double(yp) +
double(zp) * double(zp) +
double(wp) * double(wp);
double(zp) * double(zp);
if (!qFuzzyIsNull(len))
return QQuaternion(wp / len, -xp / len, -yp / len, -zp / len);
return QQuaternion(0.0f, 0.0f, 0.0f, 0.0f);
@ -213,28 +213,28 @@ inline QQuaternion QQuaternion::conjugate() const
inline QQuaternion &QQuaternion::operator+=(const QQuaternion &quaternion)
{
wp += quaternion.wp;
xp += quaternion.xp;
yp += quaternion.yp;
zp += quaternion.zp;
wp += quaternion.wp;
return *this;
}
inline QQuaternion &QQuaternion::operator-=(const QQuaternion &quaternion)
{
wp -= quaternion.wp;
xp -= quaternion.xp;
yp -= quaternion.yp;
zp -= quaternion.zp;
wp -= quaternion.wp;
return *this;
}
inline QQuaternion &QQuaternion::operator*=(float factor)
{
wp *= factor;
xp *= factor;
yp *= factor;
zp *= factor;
wp *= factor;
return *this;
}
@ -262,16 +262,16 @@ inline QQuaternion &QQuaternion::operator*=(const QQuaternion &quaternion)
inline QQuaternion &QQuaternion::operator/=(float divisor)
{
wp /= divisor;
xp /= divisor;
yp /= divisor;
zp /= divisor;
wp /= divisor;
return *this;
}
inline bool operator==(const QQuaternion &q1, const QQuaternion &q2)
{
return q1.xp == q2.xp && q1.yp == q2.yp && q1.zp == q2.zp && q1.wp == q2.wp;
return q1.wp == q2.wp && q1.xp == q2.xp && q1.yp == q2.yp && q1.zp == q2.zp;
}
inline bool operator!=(const QQuaternion &q1, const QQuaternion &q2)
@ -311,10 +311,10 @@ inline const QQuaternion operator/(const QQuaternion &quaternion, float divisor)
inline bool qFuzzyCompare(const QQuaternion& q1, const QQuaternion& q2)
{
return qFuzzyCompare(q1.xp, q2.xp) &&
return qFuzzyCompare(q1.wp, q2.wp) &&
qFuzzyCompare(q1.xp, q2.xp) &&
qFuzzyCompare(q1.yp, q2.yp) &&
qFuzzyCompare(q1.zp, q2.zp) &&
qFuzzyCompare(q1.wp, q2.wp);
qFuzzyCompare(q1.zp, q2.zp);
}
#ifndef QT_NO_VECTOR3D