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authorJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
committerJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
commit0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (patch)
tree2ea1f8305970753e4a657acb2ccc15ca3eec8e2c /sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c
parent7d58530341304d403a6626d7f7a1913165fe2f32 (diff)
downloadglibc-0ecb606cb6cf65de1d9fc8a919bceb4be476c602.tar.gz
2.5-18.1
Diffstat (limited to 'sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c')
-rw-r--r--sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c b/sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c
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index 0000000000..39d0e6a5e3
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+++ b/sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c
@@ -0,0 +1,119 @@
+/* s_nextafterl.c -- long double version of s_nextafter.c.
+ * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
+ */
+
+/*
+ * ====================================================
+ * 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.
+ * ====================================================
+ */
+
+#if defined(LIBM_SCCS) && !defined(lint)
+static char rcsid[] = "$NetBSD: $";
+#endif
+
+/* IEEE functions
+ * nextafterl(x,y)
+ * return the next machine floating-point number of x in the
+ * direction toward y.
+ * Special cases:
+ */
+
+#include <math.h>
+#include <math_private.h>
+#include <math_ldbl_opt.h>
+
+#ifdef __STDC__
+ long double __nextafterl(long double x, long double y)
+#else
+ long double __nextafterl(x,y)
+ long double x,y;
+#endif
+{
+ int64_t hx,hy,ihx,ihy,ilx;
+ u_int64_t lx,ly;
+
+ GET_LDOUBLE_WORDS64(hx,lx,x);
+ GET_LDOUBLE_WORDS64(hy,ly,y);
+ ihx = hx&0x7fffffffffffffffLL; /* |hx| */
+ ilx = lx&0x7fffffffffffffffLL; /* |lx| */
+ ihy = hy&0x7fffffffffffffffLL; /* |hy| */
+
+ if((((ihx&0x7ff0000000000000LL)==0x7ff0000000000000LL)&&
+ ((ihx&0x000fffffffffffffLL)!=0)) || /* x is nan */
+ (((ihy&0x7ff0000000000000LL)==0x7ff0000000000000LL)&&
+ ((ihy&0x000fffffffffffffLL)!=0))) /* y is nan */
+ return x+y; /* signal the nan */
+ if(x==y)
+ return y; /* x=y, return y */
+ if(ihx == 0 && ilx == 0) { /* x == 0 */
+ long double u;
+ hy = (hy & 0x8000000000000000ULL) | 1;
+ SET_LDOUBLE_WORDS64(x,hy,0ULL);/* return +-minsubnormal */
+ u = math_opt_barrier (x);
+ u = u * u;
+ math_force_eval (u); /* raise underflow flag */
+ return x;
+ }
+
+ long double u;
+ if(x > y) { /* x > y, x -= ulp */
+ if((hx==0xffefffffffffffffLL)&&(lx==0xfc8ffffffffffffeLL))
+ return x+x; /* overflow, return -inf */
+ if (hx >= 0x7ff0000000000000LL) {
+ SET_LDOUBLE_WORDS64(u,0x7fefffffffffffffLL,0x7c8ffffffffffffeLL);
+ return u;
+ }
+ if(ihx <= 0x0360000000000000LL) { /* x <= LDBL_MIN */
+ u = math_opt_barrier (x);
+ x -= __LDBL_DENORM_MIN__;
+ if (ihx < 0x0360000000000000LL
+ || (hx > 0 && (int64_t) lx <= 0)
+ || (hx < 0 && (int64_t) lx > 1)) {
+ u = u * u;
+ math_force_eval (u); /* raise underflow flag */
+ }
+ return x;
+ }
+ if (ihx < 0x06a0000000000000LL) { /* ulp will denormal */
+ SET_LDOUBLE_WORDS64(u,(hx&0x7ff0000000000000LL),0ULL);
+ u *= 0x1.0000000000000p-105L;
+ } else
+ SET_LDOUBLE_WORDS64(u,(hx&0x7ff0000000000000LL)-0x0690000000000000LL,0ULL);
+ return x - u;
+ } else { /* x < y, x += ulp */
+ if((hx==0x7fefffffffffffffLL)&&(lx==0x7c8ffffffffffffeLL))
+ return x+x; /* overflow, return +inf */
+ if ((u_int64_t) hx >= 0xfff0000000000000ULL) {
+ SET_LDOUBLE_WORDS64(u,0xffefffffffffffffLL,0xfc8ffffffffffffeLL);
+ return u;
+ }
+ if(ihx <= 0x0360000000000000LL) { /* x <= LDBL_MIN */
+ u = math_opt_barrier (x);
+ x += __LDBL_DENORM_MIN__;
+ if (ihx < 0x0360000000000000LL
+ || (hx > 0 && (int64_t) lx < 0 && lx != 0x8000000000000001LL)
+ || (hx < 0 && (int64_t) lx >= 0)) {
+ u = u * u;
+ math_force_eval (u); /* raise underflow flag */
+ }
+ if (x == 0.0L) /* handle negative __LDBL_DENORM_MIN__ case */
+ x = -0.0L;
+ return x;
+ }
+ if (ihx < 0x06a0000000000000LL) { /* ulp will denormal */
+ SET_LDOUBLE_WORDS64(u,(hx&0x7ff0000000000000LL),0ULL);
+ u *= 0x1.0000000000000p-105L;
+ } else
+ SET_LDOUBLE_WORDS64(u,(hx&0x7ff0000000000000LL)-0x0690000000000000LL,0ULL);
+ return x + u;
+ }
+}
+strong_alias (__nextafterl, __nexttowardl)
+long_double_symbol (libm, __nextafterl, nextafterl);
+long_double_symbol (libm, __nexttowardl, nexttowardl);