X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fmath%2Facosl.c;h=9e7b7fb3a146c0c978070cd4b9eb428d873a0d21;hb=ae4b0b96d63fe3cbd70008350f998570c9e91f7f;hp=21e6c95e8cba60bdeaa278a1c814d8418c1d10bd;hpb=b69f695acedd4ce2798ef9ea28d834ceccc789bd;p=musl

diff --git a/src/math/acosl.c b/src/math/acosl.c
index 21e6c95e..9e7b7fb3 100644
--- a/src/math/acosl.c
+++ b/src/math/acosl.c
@@ -24,68 +24,45 @@ long double acosl(long double x)
 #elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
 #include "__invtrigl.h"
 
-static const long double
-one = 1.00000000000000000000e+00;
-
-// FIXME
-//#ifdef __i386__
-/* XXX Work around the fact that gcc truncates long double constants on i386 */
-static volatile double
-pi1 = 3.14159265358979311600e+00, /* 0x1.921fb54442d18p+1 */
-pi2 = 1.22514845490862001043e-16; /* 0x1.1a80000000000p-53 */
-#define pi ((long double)pi1 + pi2)
-//#else
-#if 0
-static const long double
-pi = 3.14159265358979323846264338327950280e+00L;
-#endif
-
 long double acosl(long double x)
 {
 	union IEEEl2bits u;
-	long double z, p, q, r, w, s, c, df;
+	long double z, w, s, c, df;
 	int16_t expsign, expt;
 	u.e = x;
 	expsign = u.xbits.expsign;
 	expt = expsign & 0x7fff;
-	if (expt >= BIAS) {        /* |x| >= 1 */
-		if (expt == BIAS &&
+	/* |x| >= 1 or nan */
+	if (expt >= 0x3fff) {
+		if (expt == 0x3fff &&
 			((u.bits.manh & ~LDBL_NBIT) | u.bits.manl) == 0) {
 			if (expsign > 0)
-				return 0.0;  /* acos(1) = 0 */
-			else
-				return pi + 2.0 * pio2_lo;  /* acos(-1)= pi */
+				return 0;  /* acos(1) = 0 */
+			return 2*pio2_hi + 0x1p-120f;  /* acos(-1)= pi */
 		}
-		return (x - x) / (x - x);  /* acos(|x|>1) is NaN */
+		return 0/(x-x);  /* acos(|x|>1) is NaN */
 	}
-	if (expt < BIAS - 1) {     /* |x| < 0.5 */
-		if (expt < ACOS_CONST)
-			return pio2_hi + pio2_lo;  /* x tiny: acosl=pi/2 */
-		z = x * x;
-		p = P(z);
-		q = Q(z);
-		r = p / q;
-		return pio2_hi - (x - (pio2_lo - x * r));
-	} else if (expsign < 0) {  /* x < -0.5 */
-		z = (one + x) * 0.5;
-		p = P(z);
-		q = Q(z);
-		s = sqrtl(z);
-		r = p / q;
-		w = r * s - pio2_lo;
-		return pi - 2.0 * (s + w);
-	} else {                   /* x > 0.5 */
-		z = (one - x) * 0.5;
+	/* |x| < 0.5 */
+	if (expt < 0x3fff - 1) {
+		if (expt < 0x3fff - 65)
+			return pio2_hi + 0x1p-120f;  /* x < 0x1p-65: acosl(x)=pi/2 */
+		return pio2_hi - (x - (pio2_lo - x * __invtrigl_R(x*x)));
+	}
+	/* x < -0.5 */
+	if (expsign < 0) {
+		z = (1.0 + x) * 0.5;
 		s = sqrtl(z);
-		u.e = s;
-		u.bits.manl = 0;
-		df = u.e;
-		c = (z - df * df) / (s + df);
-		p = P(z);
-		q = Q(z);
-		r = p / q;
-		w = r * s + c;
-		return 2.0 * (df + w);
+		w = __invtrigl_R(z) * s - pio2_lo;
+		return 2*(pio2_hi - (s + w));
 	}
+	/* x > 0.5 */
+	z = (1.0 - x) * 0.5;
+	s = sqrtl(z);
+	u.e = s;
+	u.bits.manl = 0;
+	df = u.e;
+	c = (z - df * df) / (s + df);
+	w = __invtrigl_R(z) * s + c;
+	return 2*(df + w);
 }
 #endif