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Diffstat (limited to 'newlib/libm/common/sf_llround.c')
-rw-r--r-- | newlib/libm/common/sf_llround.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/newlib/libm/common/sf_llround.c b/newlib/libm/common/sf_llround.c new file mode 100644 index 000000000..fe2b4bd23 --- /dev/null +++ b/newlib/libm/common/sf_llround.c @@ -0,0 +1,55 @@ +/* lroundf adapted to be llroundf for Newlib, 2009 by Craig Howland. */ +/* + * ==================================================== + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. + * + * Developed at SunPro, a Sun Microsystems, Inc. business. + * Permission to use, copy, modify, and distribute this + * software is freely granted, provided that this notice + * is preserved. + * ==================================================== + */ + +#include "fdlibm.h" + +long long int +llroundf(float x) +{ + __int32_t exponent_less_127; + __uint32_t w; + long long int result; + __int32_t sign; + + GET_FLOAT_WORD (w, x); + exponent_less_127 = ((w & 0x7f800000) >> 23) - 127; + sign = (w & 0x80000000) != 0 ? -1 : 1; + w &= 0x7fffff; + w |= 0x800000; + + if (exponent_less_127 < (int)((8 * sizeof (long long int)) - 1)) + { + if (exponent_less_127 < 0) + return exponent_less_127 < -1 ? 0 : sign; + else if (exponent_less_127 >= 23) + result = (long long int) w << (exponent_less_127 - 23); + else + { + w += 0x400000 >> exponent_less_127; + result = w >> (23 - exponent_less_127); + } + } + else + return (long long int) x; + + return sign * result; +} + +#ifdef _DOUBLE_IS_32BITS + +long long int +llround(double x) +{ + return llroundf((float) x); +} + +#endif /* defined(_DOUBLE_IS_32BITS) */ |