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-rw-r--r--libquadmath/math/nextafterq.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/libquadmath/math/nextafterq.c b/libquadmath/math/nextafterq.c
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+++ b/libquadmath/math/nextafterq.c
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+/* 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.
+ * ====================================================
+ */
+
+#include "quadmath-imp.h"
+
+__float128
+nextafterq (__float128 x, __float128 y)
+{
+ int64_t hx,hy,ix,iy;
+ uint64_t lx,ly;
+
+ GET_FLT128_WORDS64(hx,lx,x);
+ GET_FLT128_WORDS64(hy,ly,y);
+ ix = hx&0x7fffffffffffffffLL; /* |x| */
+ iy = hy&0x7fffffffffffffffLL; /* |y| */
+
+ if(((ix>=0x7fff000000000000LL)&&((ix-0x7fff000000000000LL)|lx)!=0) || /* x is nan */
+ ((iy>=0x7fff000000000000LL)&&((iy-0x7fff000000000000LL)|ly)!=0)) /* y is nan */
+ return x+y;
+ if(x==y) return y; /* x=y, return y */
+ if((ix|lx)==0) { /* x == 0 */
+ SET_FLT128_WORDS64(x,hy&0x8000000000000000ULL,1);/* return +-minsubnormal */
+
+ /* here we should raise an underflow flag */
+ return x;
+ }
+ if(hx>=0) { /* x > 0 */
+ if(hx>hy||((hx==hy)&&(lx>ly))) { /* x > y, x -= ulp */
+ if(lx==0) hx--;
+ lx--;
+ } else { /* x < y, x += ulp */
+ lx++;
+ if(lx==0) hx++;
+ }
+ } else { /* x < 0 */
+ if(hy>=0||hx>hy||((hx==hy)&&(lx>ly))){/* x < y, x -= ulp */
+ if(lx==0) hx--;
+ lx--;
+ } else { /* x > y, x += ulp */
+ lx++;
+ if(lx==0) hx++;
+ }
+ }
+ hy = hx&0x7fff000000000000LL;
+ if(hy==0x7fff000000000000LL) return x+x;/* overflow */
+ if(hy==0) {
+ /* here we should raise an underflow flag */
+ }
+ SET_FLT128_WORDS64(x,hx,lx);
+ return x;
+}