diff options
Diffstat (limited to 'src/math/__rem_pio2.c')
| -rw-r--r-- | src/math/__rem_pio2.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/src/math/__rem_pio2.c b/src/math/__rem_pio2.c index 5fafc4a8..a40db9fc 100644 --- a/src/math/__rem_pio2.c +++ b/src/math/__rem_pio2.c @@ -19,6 +19,12 @@ #include "libm.h" +#if FLT_EVAL_METHOD==0 || FLT_EVAL_METHOD==1 +#define EPS DBL_EPSILON +#elif FLT_EVAL_METHOD==2 +#define EPS LDBL_EPSILON +#endif + /* * invpio2: 53 bits of 2/pi * pio2_1: first 33 bit of pi/2 @@ -29,6 +35,7 @@ * pio2_3t: pi/2 - (pio2_1+pio2_2+pio2_3) */ static const double +toint = 1.5/EPS, invpio2 = 6.36619772367581382433e-01, /* 0x3FE45F30, 0x6DC9C883 */ pio2_1 = 1.57079632673412561417e+00, /* 0x3FF921FB, 0x54400000 */ pio2_1t = 6.07710050650619224932e-11, /* 0x3DD0B461, 0x1A626331 */ @@ -41,8 +48,8 @@ pio2_3t = 8.47842766036889956997e-32; /* 0x397B839A, 0x252049C1 */ int __rem_pio2(double x, double *y) { union {double f; uint64_t i;} u = {x}; - double_t z,w,t,r; - double tx[3],ty[2],fn; + double_t z,w,t,r,fn; + double tx[3],ty[2]; uint32_t ix; int sign, n, ex, ey, i; @@ -111,8 +118,7 @@ int __rem_pio2(double x, double *y) if (ix < 0x413921fb) { /* |x| ~< 2^20*(pi/2), medium size */ medium: /* rint(x/(pi/2)), Assume round-to-nearest. */ - fn = x*invpio2 + 0x1.8p52; - fn = fn - 0x1.8p52; + fn = x*invpio2 + toint - toint; n = (int32_t)fn; r = x - fn*pio2_1; w = fn*pio2_1t; /* 1st round, good to 85 bits */ |