X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fmath%2F__rem_pio2.c;h=a40db9fc05fdd028d90f11d8f9ce8f8db6992fcf;hb=b72cd07f176b876aa51864d93aa8101477b1d732;hp=5fafc4a8aca547ebd671f40680618960a61705b0;hpb=3fdf94ec5101fab63d0e8196d3e557641a0e19e2;p=musl

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 */