From 13868474f9aac7a0138a1a8d226973713b46a9ba Mon Sep 17 00:00:00 2001
From: Ivan Solovev <ivan.solovev@qt.io>
Date: Wed, 6 Jul 2022 14:59:04 +0200
Subject: Move numeric functions from qglobal.h to qnumeric.h

Task-number: QTBUG-99313
Change-Id: Ic7f7d6ea6d2b81a8593c7cfe05aee1d62921afd1
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
---
 src/corelib/global/qnumeric.h | 75 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)

(limited to 'src/corelib/global/qnumeric.h')

diff --git a/src/corelib/global/qnumeric.h b/src/corelib/global/qnumeric.h
index b10936b38f..24fa782f06 100644
--- a/src/corelib/global/qnumeric.h
+++ b/src/corelib/global/qnumeric.h
@@ -319,6 +319,81 @@ template <auto V2, typename T> bool qMulOverflow(T v1, T *r)
     return qMulOverflow(v1, std::integral_constant<T, V2>{}, r);
 }
 
+template <typename T>
+constexpr inline T qAbs(const T &t) { return t >= 0 ? t : -t; }
+
+// gcc < 10 doesn't have __has_builtin
+#if defined(Q_PROCESSOR_ARM_64) && (__has_builtin(__builtin_round) || defined(Q_CC_GNU)) && !defined(Q_CC_CLANG)
+// ARM64 has a single instruction that can do C++ rounding with conversion to integer.
+// Note current clang versions have non-constexpr __builtin_round, ### allow clang this path when they fix it.
+constexpr inline int qRound(double d)
+{ return int(__builtin_round(d)); }
+constexpr inline int qRound(float f)
+{ return int(__builtin_roundf(f)); }
+constexpr inline qint64 qRound64(double d)
+{ return qint64(__builtin_round(d)); }
+constexpr inline qint64 qRound64(float f)
+{ return qint64(__builtin_roundf(f)); }
+#elif defined(__SSE2__) && (__has_builtin(__builtin_copysign) || defined(Q_CC_GNU))
+// SSE has binary operations directly on floating point making copysign fast
+constexpr inline int qRound(double d)
+{ return int(d + __builtin_copysign(0.5, d)); }
+constexpr inline int qRound(float f)
+{ return int(f + __builtin_copysignf(0.5f, f)); }
+constexpr inline qint64 qRound64(double d)
+{ return qint64(d + __builtin_copysign(0.5, d)); }
+constexpr inline qint64 qRound64(float f)
+{ return qint64(f + __builtin_copysignf(0.5f, f)); }
+#else
+constexpr inline int qRound(double d)
+{ return d >= 0.0 ? int(d + 0.5) : int(d - 0.5); }
+constexpr inline int qRound(float d)
+{ return d >= 0.0f ? int(d + 0.5f) : int(d - 0.5f); }
+
+constexpr inline qint64 qRound64(double d)
+{ return d >= 0.0 ? qint64(d + 0.5) : qint64(d - 0.5); }
+constexpr inline qint64 qRound64(float d)
+{ return d >= 0.0f ? qint64(d + 0.5f) : qint64(d - 0.5f); }
+#endif
+
+[[nodiscard]] constexpr bool qFuzzyCompare(double p1, double p2)
+{
+    return (qAbs(p1 - p2) * 1000000000000. <= qMin(qAbs(p1), qAbs(p2)));
+}
+
+[[nodiscard]] constexpr bool qFuzzyCompare(float p1, float p2)
+{
+    return (qAbs(p1 - p2) * 100000.f <= qMin(qAbs(p1), qAbs(p2)));
+}
+
+[[nodiscard]] constexpr bool qFuzzyIsNull(double d)
+{
+    return qAbs(d) <= 0.000000000001;
+}
+
+[[nodiscard]] constexpr bool qFuzzyIsNull(float f)
+{
+    return qAbs(f) <= 0.00001f;
+}
+
+QT_WARNING_PUSH
+QT_WARNING_DISABLE_FLOAT_COMPARE
+
+[[nodiscard]] constexpr bool qIsNull(double d) noexcept
+{
+    return d == 0.0;
+}
+
+[[nodiscard]] constexpr bool qIsNull(float f) noexcept
+{
+    return f == 0.0f;
+}
+
+QT_WARNING_POP
+
+inline int qIntCast(double f) { return int(f); }
+inline int qIntCast(float f) { return int(f); }
+
 QT_END_NAMESPACE
 
 #endif // QNUMERIC_H
-- 
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