1 files changed, 83 insertions, 0 deletions
diff --git a/sysdeps/sparc/sparc64/fpu/s_floor.S b/sysdeps/sparc/sparc64/fpu/s_floor.S
new file mode 100644
index 0000000000..88d9c4d193
--- /dev/null
+++ b/sysdeps/sparc/sparc64/fpu/s_floor.S
@@ -0,0 +1,83 @@
+/* floor function, sparc64 version.
+   Copyright (C) 2012 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by David S. Miller <davem@davemloft.net>, 2012.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+
+	/* Since changing the rounding mode is extremely expensive, we
+	   try to round up using a method that is rounding mode
+	   agnostic.
+
+	   We add then subtract (or subtract than add if the initial
+	   value was negative) 2**23 to the value, then subtract it
+	   back out.
+
+	   This will clear out the fractional portion of the value.
+	   One of two things will happen for non-whole initial values.
+	   Either the rounding mode will round it up, or it will be
+	   rounded down.  If the value started out whole, it will be
+	   equal after the addition and subtraction.  This means we
+	   can accurately detect with one test whether we need to add
+	   another 1.0 to round it up properly.
+
+	   We pop constants into the FPU registers using the incoming
+	   argument stack slots, since this avoid having to use any
+	   PIC references.  We also thus avoid having to allocate a
+	   register window.
+
+	   VIS instructions are used to facilitate the formation of
+	   easier constants, and the propagation of the sign bit.  */
+
+#define TWO_FIFTYTWO	0x43300000		/* 2**52 */
+#define ONE_DOT_ZERO	0x3ff00000		/* 1.0 */
+
+#define ZERO		%f10			/* 0.0 */
+#define SIGN_BIT	%f12			/* -0.0 */
+
+ENTRY (__floor)
+	sethi	%hi(TWO_FIFTYTWO), %o2
+	sethi	%hi(ONE_DOT_ZERO), %o3
+	fzero	ZERO
+
+	sllx	%o2, 32, %o2
+	fnegd	ZERO, SIGN_BIT
+
+	sllx	%o3, 32, %o3
+	stx	%o2, [%sp + STACK_BIAS + 128]
+	fabsd	%f0, %f14
+
+	ldd	[%sp + STACK_BIAS + 128], %f16
+	fcmpd	%fcc3, %f14, %f16
+
+	fmovduge %fcc3, ZERO, %f16
+	fand	%f0, SIGN_BIT, SIGN_BIT
+
+	for	%f16, SIGN_BIT, %f16
+	faddd	%f0, %f16, %f18
+	fsubd	%f18, %f16, %f18
+	fcmpd	%fcc2, %f18, %f0
+	stx	%o3, [%sp + STACK_BIAS + 128]
+
+	ldd	[%sp + STACK_BIAS + 128], %f20
+	fmovdule %fcc2, ZERO, %f20
+	fsubd	%f18, %f20, %f0
+	fabsd	%f0, %f0
+	retl
+	 for	%f0, SIGN_BIT, %f0
+END (__floor)
+weak_alias (__floor, floor)