2.5-18.1

1 files changed, 94 insertions, 0 deletions

diff --git a/sysdeps/ieee754/ldbl-128ibm/s_modfl.c b/sysdeps/ieee754/ldbl-128ibm/s_modfl.c
new file mode 100644
index 0000000000..f2e65f0c44
--- /dev/null
+++ b/sysdeps/ieee754/ldbl-128ibm/s_modfl.c
@@ -0,0 +1,94 @@
+/* s_modfl.c -- long double version of s_modf.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
+
+/*
+ * modfl(long double x, long double *iptr)
+ * return fraction part of x, and return x's integral part in *iptr.
+ * Method:
+ *	Bit twiddling.
+ *
+ * Exception:
+ *	No exception.
+ */
+
+#include "math.h"
+#include "math_private.h"
+#include <math_ldbl_opt.h>
+
+#ifdef __STDC__
+static const long double one = 1.0;
+#else
+static long double one = 1.0;
+#endif
+
+#ifdef __STDC__
+	long double __modfl(long double x, long double *iptr)
+#else
+	long double __modfl(x, iptr)
+	long double x,*iptr;
+#endif
+{
+	int64_t i0,i1,j0;
+	u_int64_t i;
+	GET_LDOUBLE_WORDS64(i0,i1,x);
+	i1 &= 0x000fffffffffffffLL;
+	j0 = ((i0>>52)&0x7ff)-0x3ff;	/* exponent of x */
+	if(j0<52) {			/* integer part in high x */
+	    if(j0<0) {			/* |x|<1 */
+		/* *iptr = +-0 */
+	        SET_LDOUBLE_WORDS64(*iptr,i0&0x8000000000000000ULL,0);
+		return x;
+	    } else {
+		i = (0x000fffffffffffffLL)>>j0;
+		if(((i0&i)|(i1&0x7fffffffffffffffLL))==0) {		/* x is integral */
+		    *iptr = x;
+		    /* return +-0 */
+		    SET_LDOUBLE_WORDS64(x,i0&0x8000000000000000ULL,0);
+		    return x;
+		} else {
+		    SET_LDOUBLE_WORDS64(*iptr,i0&(~i),0);
+		    return x - *iptr;
+		}
+	    }
+	} else if (j0>103) {		/* no fraction part */
+	    *iptr = x*one;
+	    /* We must handle NaNs separately.  */
+	    if (j0 == 0x400 && ((i0 & 0x000fffffffffffffLL) | i1))
+	      return x*one;
+	    /* return +-0 */
+	    SET_LDOUBLE_WORDS64(x,i0&0x8000000000000000ULL,0);
+	    return x;
+	} else {			/* fraction part in low x */
+	    i = -1ULL>>(j0-52);
+	    if((i1&i)==0) { 		/* x is integral */
+		*iptr = x;
+		/* return +-0 */
+		SET_LDOUBLE_WORDS64(x,i0&0x8000000000000000ULL,0);
+		return x;
+	    } else {
+		SET_LDOUBLE_WORDS64(*iptr,i0,i1&(~i));
+		return x - *iptr;
+	    }
+	}
+}
+#ifdef IS_IN_libm
+long_double_symbol (libm, __modfl, modfl);
+#else
+long_double_symbol (libc, __modfl, modfl);
+#endif