--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libquadmath/math/modfq.c	Sun Aug 21 07:07:55 2011 +0900
@@ -0,0 +1,64 @@
+/* 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.
+ * ====================================================
+ */
+
+#include "quadmath-imp.h"
+
+static const __float128 one = 1.0;
+
+__float128
+modfq (__float128 x, __float128 *iptr)
+{
+	int64_t i0,i1,j0;
+	uint64_t i;
+	GET_FLT128_WORDS64(i0,i1,x);
+	j0 = ((i0>>48)&0x7fff)-0x3fff;	/* exponent of x */
+	if(j0<48) {			/* integer part in high x */
+	    if(j0<0) {			/* |x|<1 */
+		/* *iptr = +-0 */
+	        SET_FLT128_WORDS64(*iptr,i0&0x8000000000000000ULL,0);
+		return x;
+	    } else {
+		i = (0x0000ffffffffffffLL)>>j0;
+		if(((i0&i)|i1)==0) {		/* x is integral */
+		    *iptr = x;
+		    /* return +-0 */
+		    SET_FLT128_WORDS64(x,i0&0x8000000000000000ULL,0);
+		    return x;
+		} else {
+		    SET_FLT128_WORDS64(*iptr,i0&(~i),0);
+		    return x - *iptr;
+		}
+	    }
+	} else if (j0>111) {		/* no fraction part */
+	    *iptr = x*one;
+	    /* We must handle NaNs separately.  */
+	    if (j0 == 0x4000 && ((i0 & 0x0000ffffffffffffLL) | i1))
+	      return x*one;
+	    /* return +-0 */
+	    SET_FLT128_WORDS64(x,i0&0x8000000000000000ULL,0);
+	    return x;
+	} else {			/* fraction part in low x */
+	    i = -1ULL>>(j0-48);
+	    if((i1&i)==0) { 		/* x is integral */
+		*iptr = x;
+		/* return +-0 */
+		SET_FLT128_WORDS64(x,i0&0x8000000000000000ULL,0);
+		return x;
+	    } else {
+		SET_FLT128_WORDS64(*iptr,i0,i1&(~i));
+		return x - *iptr;
+	    }
+	}
+}