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33 #include <xmmintrin.h>
34 #include <emmintrin.h>
38 #include <smmintrin.h>
41 /* The C standard library has functions round()/rint()/nearbyint() that round
42 * their arguments according to the rounding mode set in the floating-point
43 * control register. While there are trunc()/ceil()/floor() functions that do
44 * a specific operation without modifying the rounding mode, there is no
45 * roundeven() in any version of C.
47 * Technical Specification 18661 (ISO/IEC TS 18661-1:2014) adds roundeven(),
48 * but it's unfortunately not implemented by glibc.
50 * This implementation differs in that it does not raise the inexact exception.
52 * We use rint() to implement these functions, with the assumption that the
53 * floating-point rounding mode has not been changed from the default Round
58 * \brief Rounds \c x to the nearest integer, with ties to the even integer.
61 _mesa_roundevenf(float x
)
65 __m128 m
= _mm_load_ss(&x
);
66 m
= _mm_round_ss(m
, m
, _MM_FROUND_CUR_DIRECTION
| _MM_FROUND_NO_EXC
);
67 _mm_store_ss(&ret
, m
);
75 * \brief Rounds \c x to the nearest integer, with ties to the even integer.
78 _mesa_roundeven(double x
)
82 __m128d m
= _mm_load_sd(&x
);
83 m
= _mm_round_sd(m
, m
, _MM_FROUND_CUR_DIRECTION
| _MM_FROUND_NO_EXC
);
84 _mm_store_sd(&ret
, m
);
92 * \brief Rounds \c x to the nearest integer, with ties to the even integer,
93 * and returns the value as a long int.
96 _mesa_lroundevenf(float x
)
99 #if LONG_MAX == INT64_MAX
100 return _mm_cvtss_si64(_mm_load_ss(&x
));
101 #elif LONG_MAX == INT32_MAX
102 return _mm_cvtss_si32(_mm_load_ss(&x
));
104 #error "Unsupported long size"
112 * \brief Rounds \c x to the nearest integer, with ties to the even integer,
113 * and returns the value as a long int.
116 _mesa_lroundeven(double x
)
119 #if LONG_MAX == INT64_MAX
120 return _mm_cvtsd_si64(_mm_load_sd(&x
));
121 #elif LONG_MAX == INT32_MAX
122 return _mm_cvtsd_si32(_mm_load_sd(&x
));
124 #error "Unsupported long size"