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qfloat16: use std::numeric_limits<std::float16> if available

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Instead of going through the bit casts. Also solves the violation of
constexpr requirements from the previous commit.

Change-Id: I01ec3c774d9943adb903fffd17b8b6ee93d3c031
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
(cherry picked from commit 398a51686eda225f222d9df7ce56898c18ecdaa1)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Thiago Macieira 2024-03-01 10:19:54 -08:00 committed by Qt Cherry-pick Bot
parent 922370814a
commit 8a92fbf80c
1 changed files with 15 additions and 0 deletions
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15
src/corelib/global/qfloat16.h
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@ -93,6 +93,20 @@ public:
qfloat16 copySign(qfloat16 sign) const noexcept
{ return qfloat16(Wrap((sign.b16 & 0x8000) | (b16 & 0x7fff))); }
// Support for std::numeric_limits<qfloat16>
#ifdef __STDCPP_FLOAT16_T__
private:
using Bounds = std::numeric_limits<NativeType>;
public:
static constexpr qfloat16 _limit_epsilon() noexcept { return Bounds::epsilon(); }
static constexpr qfloat16 _limit_min() noexcept { return Bounds::min(); }
static constexpr qfloat16 _limit_denorm_min() noexcept { return Bounds::denorm_min(); }
static constexpr qfloat16 _limit_max() noexcept { return Bounds::max(); }
static constexpr qfloat16 _limit_lowest() noexcept { return Bounds::lowest(); }
static constexpr qfloat16 _limit_infinity() noexcept { return Bounds::infinity(); }
static constexpr qfloat16 _limit_quiet_NaN() noexcept { return Bounds::quiet_NaN(); }
static constexpr qfloat16 _limit_signaling_NaN() noexcept { return Bounds::signaling_NaN(); }
#else
static constexpr qfloat16 _limit_epsilon() noexcept { return qfloat16(Wrap(0x1400)); }
static constexpr qfloat16 _limit_min() noexcept { return qfloat16(Wrap(0x400)); }
static constexpr qfloat16 _limit_denorm_min() noexcept { return qfloat16(Wrap(1)); }
@ -102,6 +116,7 @@ public:
static constexpr qfloat16 _limit_quiet_NaN() noexcept { return qfloat16(Wrap(0x7e00)); }
#if QT_CONFIG(signaling_nan)
static constexpr qfloat16 _limit_signaling_NaN() noexcept { return qfloat16(Wrap(0x7d00)); }
#endif
#endif
inline constexpr bool isNormal() const noexcept
{ return (b16 & 0x7c00) && (b16 & 0x7c00) != 0x7c00; }