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Remove global -ffast-math flag, but apply fast math to just color_hel…
…pers.h/color_helpers.cpp Turn on FTZ/DAZ inside create_color_mgmt_luts()
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Original file line number | Diff line number | Diff line change |
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#pragma once | ||
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namespace gamescope::Directives { | ||
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struct FlagSwitcher { | ||
unsigned long long m_csr; | ||
FlagSwitcher(); | ||
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~FlagSwitcher(); | ||
}; | ||
} | ||
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#if defined(__x86__) || defined(__x86_64__) | ||
# include <xmmintrin.h> | ||
# include <pmmintrin.h> | ||
# define SET_FAST_MATH_FLAGS gamescope::Directives::FlagSwitcher switcher{}; | ||
# define SET_FLUSH_AND_ZERO_TO_ON(csr) _mm_setcsr( csr | (_MM_DENORMALS_ZERO_ON | _MM_FLUSH_ZERO_ON) ) | ||
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gamescope::Directives::FlagSwitcher::FlagSwitcher() : m_csr{_mm_getcsr()} { | ||
SET_FLUSH_AND_ZERO_TO_ON( static_cast<unsigned int>(m_csr) ); | ||
} | ||
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gamescope::Directives::FlagSwitcher::~FlagSwitcher() { | ||
_mm_setcsr( static_cast<unsigned int>(m_csr) ); | ||
} | ||
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#elif defined(__aarch64__) && __has_builtin(__builtin_aarch64_get_fpcr64) && __has_builtin(__builtin_aarch64_set_fpcr64) | ||
# define SET_FAST_MATH_FLAGS gamescope::Directives::FlagSwitcher switcher{}; | ||
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static constexpr unsigned long long fz_bit = 0x1'00'00'00; | ||
//based on this stuff: https://github.com/DLTcollab/sse2neon/blob/706d3b58025364c2371cafcf9b16e32ff7e630ed/sse2neon.h#L2433 | ||
//and this: https://stackoverflow.com/a/59001820 | ||
static constexpr unsigned long long fz16_bit = 0x8'00'00; | ||
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gamescope::Directives::FlagSwitcher::FlagSwitcher() : m_csr{__builtin_aarch64_get_fpcr64()} { | ||
__builtin_aarch64_set_fpcr64(m_csr | fz_bit | fz16_bit); | ||
} | ||
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gamescope::Directives::FlagSwitcher::~FlagSwitcher() { | ||
__builtin_aarch64_set_fpcr64(m_csr); | ||
} | ||
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#else | ||
# define SET_FAST_MATH_FLAGS | ||
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#endif | ||
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#ifdef __clang__ | ||
# define FAST_MATH_ON _Pragma("float_control(push)"); \ | ||
_Pragma("float_control(precise, off)") //https://clang.llvm.org/docs/LanguageExtensions.html#extensions-to-specify-floating-point-flags | ||
# define FAST_MATH_OFF _Pragma("float_control(pop)") | ||
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#elif defined(__GNUC__) | ||
# define FAST_MATH_ON _Pragma("GCC push_options"); \ | ||
_Pragma("GCC optimize(\"-ffast-math\")") | ||
# define FAST_MATH_OFF _Pragma("GCC pop_options") | ||
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#else | ||
# define FAST_MATH_ON | ||
# define FAST_MATH_OFF | ||
#endif |
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