1 files changed, 150 insertions, 0 deletions
diff --git a/usr/src/lib/libm/common/m9x/modfl.c b/usr/src/lib/libm/common/m9x/modfl.c
new file mode 100644
index 0000000000..000b03d41f
--- /dev/null
+++ b/usr/src/lib/libm/common/m9x/modfl.c
@@ -0,0 +1,150 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
+ */
+/*
+ * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#if defined(ELFOBJ)
+#pragma weak modfl = __modfl
+#endif
+
+#include "libm.h"
+
+#if defined(__sparc)
+
+long double
+__modfl(long double x, long double *iptr) {
+	union {
+		unsigned i[4];
+		long double q;
+	} xx, yy;
+	unsigned hx, s;
+
+	xx.q = x;
+	hx = xx.i[0] & ~0x80000000;
+
+	if (hx >= 0x406f0000) {	/* x is NaN, infinite, or integral */
+		*iptr = x;
+		if (hx < 0x7fff0000 || (hx == 0x7fff0000 &&
+			(xx.i[1] | xx.i[2] | xx.i[3]) == 0)) {
+			xx.i[0] &= 0x80000000;
+			xx.i[1] = xx.i[2] = xx.i[3] = 0;
+		}
+		return (xx.q);
+	}
+
+	if (hx < 0x3fff0000) {	/* |x| < 1 */
+		xx.i[0] &= 0x80000000;
+		xx.i[1] = xx.i[2] = xx.i[3] = 0;
+		*iptr = xx.q;
+		return (x);
+	}
+
+	/* split x at the binary point */
+	s = xx.i[0] & 0x80000000;
+	if (hx < 0x40100000) {
+		yy.i[0] = xx.i[0] & ~((1 << (0x400f - (hx >> 16))) - 1);
+		yy.i[1] = yy.i[2] = yy.i[3] = 0;
+	} else if (hx < 0x40300000) {
+		yy.i[0] = xx.i[0];
+		yy.i[1] = xx.i[1] & ~((1 << (0x402f - (hx >> 16))) - 1);
+		yy.i[2] = yy.i[3] = 0;
+	} else if (hx < 0x40500000) {
+		yy.i[0] = xx.i[0];
+		yy.i[1] = xx.i[1];
+		yy.i[2] = xx.i[2] & ~((1 << (0x404f - (hx >> 16))) - 1);
+		yy.i[3] = 0;
+	} else {
+		yy.i[0] = xx.i[0];
+		yy.i[1] = xx.i[1];
+		yy.i[2] = xx.i[2];
+		yy.i[3] = xx.i[3] & ~((1 << (0x406f - (hx >> 16))) - 1);
+	}
+	*iptr = yy.q;
+
+	/*
+	 * we could implement the following more efficiently than by using
+	 * software emulation of fsubq, but we'll do it this way for now
+	 * (and hope hardware support becomes commonplace)
+	 */
+	xx.q -= yy.q;
+	xx.i[0] = (xx.i[0] & ~0x80000000) | s;	/* keep sign of x */
+	return (xx.q);
+}
+
+#elif defined(__x86)
+
+long double
+__modfl(long double x, long double *iptr) {
+	union {
+		unsigned i[3];
+		long double e;
+	} xx, yy;
+	unsigned hx, s;
+
+	/*
+	 * It might be faster to use one of the x86 fpops instead of
+	 * the following.
+	 */
+	xx.e = x;
+	hx = xx.i[2] & 0x7fff;
+
+	if (hx >= 0x403e) {	/* x is NaN, infinite, or integral */
+		*iptr = x;
+		if (hx < 0x7fff || (hx == 0x7fff &&
+			((xx.i[1] << 1) | xx.i[0]) == 0)) {
+			xx.i[2] &= 0x8000;
+			xx.i[1] = xx.i[0] = 0;
+		}
+		return (xx.e);
+	}
+
+	if (hx < 0x3fff) {	/* |x| < 1 */
+		xx.i[2] &= 0x8000;
+		xx.i[1] = xx.i[0] = 0;
+		*iptr = xx.e;
+		return (x);
+	}
+
+	/* split x at the binary point */
+	s = xx.i[2] & 0x8000;
+	yy.i[2] = xx.i[2];
+	if (hx < 0x401f) {
+		yy.i[1] = xx.i[1] & ~((1 << (0x401e - hx)) - 1);
+		yy.i[0] = 0;
+	} else {
+		yy.i[1] = xx.i[1];
+		yy.i[0] = xx.i[0] & ~((1 << (0x403e - hx)) - 1);
+	}
+	*iptr = yy.e;
+	xx.e -= yy.e;
+	xx.i[2] = (xx.i[2] & ~0x8000) | s;	/* keep sign of x */
+	return (xx.e);
+}
+
+#else
+#error Unknown architecture
+#endif