Relocate alpha from ports to libc

Also fixed the following whitespace nits to satisfy the push:

sysdeps/alpha/alphaev6/memset.S:142: space before tab in indent.
sysdeps/alpha/configure:1: new blank line at EOF.
sysdeps/alpha/fpu/e_sqrt.c:126: space before tab in indent.
sysdeps/alpha/preconfigure:1: new blank line at EOF.
sysdeps/unix/sysv/linux/alpha/syscalls.list:1: new blank line at EOF.

1 files changed, 218 insertions, 0 deletions

diff --git a/sysdeps/alpha/ldiv.S b/sysdeps/alpha/ldiv.S
new file mode 100644
index 0000000000..63b0fd8d71
--- /dev/null
+++ b/sysdeps/alpha/ldiv.S
@@ -0,0 +1,218 @@
+/* Copyright (C) 1996-2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Richard Henderson <rth@tamu.edu>.
+
+   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 "div_libc.h"
+
+#undef FRAME
+#ifdef __alpha_fix__
+#define FRAME 0
+#else
+#define FRAME 16
+#endif
+
+#undef X
+#undef Y
+#define X $17
+#define Y $18
+
+	.set noat
+
+	.align 4
+	.globl ldiv
+	.ent ldiv
+ldiv:
+	.frame sp, FRAME, ra
+#if FRAME > 0
+	lda	sp, -FRAME(sp)
+#endif
+#ifdef PROF
+	.set	macro
+	ldgp	gp, 0(pv)
+	lda	AT, _mcount
+	jsr	AT, (AT), _mcount
+	.set	nomacro
+	.prologue 1
+#else
+	.prologue 0
+#endif
+
+	beq	Y, $divbyzero
+	excb
+	mf_fpcr	$f10
+
+	_ITOFT2	X, $f0, 0, Y, $f1, 8
+
+	.align	4
+	cvtqt	$f0, $f0
+	cvtqt	$f1, $f1
+	divt/c	$f0, $f1, $f0
+	unop
+
+	/* Check to see if X fit in the double as an exact value.  */
+	sll	X, (64-53), AT
+	sra	AT, (64-53), AT
+	cmpeq	X, AT, AT
+	beq	AT, $x_big
+
+	/* If we get here, we're expecting exact results from the division.
+	   Do nothing else besides convert and clean up.  */
+	cvttq/c	$f0, $f0
+	excb
+	mt_fpcr	$f10
+	_FTOIT	$f0, $0, 0
+
+$egress:
+	mulq	$0, Y, $1
+	subq	X, $1, $1
+
+	stq	$0, 0($16)
+	stq	$1, 8($16)
+	mov	$16, $0
+
+#if FRAME > 0
+	lda	sp, FRAME(sp)
+#endif
+	ret
+
+	.align	4
+$x_big:
+	/* If we get here, X is large enough that we don't expect exact
+	   results, and neither X nor Y got mis-translated for the fp
+	   division.  Our task is to take the fp result, figure out how
+	   far it's off from the correct result and compute a fixup.  */
+
+#define Q	v0		/* quotient */
+#define R	t0		/* remainder */
+#define SY	t1		/* scaled Y */
+#define S	t2		/* scalar */
+#define QY	t3		/* Q*Y */
+
+	/* The fixup code below can only handle unsigned values.  */
+	or	X, Y, AT
+	mov	$31, t5
+	blt	AT, $fix_sign_in
+$fix_sign_in_ret1:
+	cvttq/c	$f0, $f0
+
+	_FTOIT	$f0, Q, 8
+$fix_sign_in_ret2:
+	mulq	Q, Y, QY
+	excb
+	mt_fpcr	$f10
+
+	.align	4
+	subq	QY, X, R
+	mov	Y, SY
+	mov	1, S
+	bgt	R, $q_high
+
+$q_high_ret:
+	subq	X, QY, R
+	mov	Y, SY
+	mov	1, S
+	bgt	R, $q_low
+
+$q_low_ret:
+	negq	Q, t4
+	cmovlbs	t5, t4, Q
+	br	$egress
+
+	.align	4
+	/* The quotient that we computed was too large.  We need to reduce
+	   it by S such that Y*S >= R.  Obviously the closer we get to the
+	   correct value the better, but overshooting high is ok, as we'll
+	   fix that up later.  */
+0:
+	addq	SY, SY, SY
+	addq	S, S, S
+$q_high:
+	cmpult	SY, R, AT
+	bne	AT, 0b
+
+	subq	Q, S, Q
+	unop
+	subq	QY, SY, QY
+	br	$q_high_ret
+
+	.align	4
+	/* The quotient that we computed was too small.  Divide Y by the
+	   current remainder (R) and add that to the existing quotient (Q).
+	   The expectation, of course, is that R is much smaller than X.  */
+	/* Begin with a shift-up loop.  Compute S such that Y*S >= R.  We
+	   already have a copy of Y in SY and the value 1 in S.  */
+0:
+	addq	SY, SY, SY
+	addq	S, S, S
+$q_low:
+	cmpult	SY, R, AT
+	bne	AT, 0b
+
+	/* Shift-down and subtract loop.  Each iteration compares our scaled
+	   Y (SY) with the remainder (R); if SY <= R then X is divisible by
+	   Y's scalar (S) so add it to the quotient (Q).  */
+2:	addq	Q, S, t3
+	srl	S, 1, S
+	cmpule	SY, R, AT
+	subq	R, SY, t4
+
+	cmovne	AT, t3, Q
+	cmovne	AT, t4, R
+	srl	SY, 1, SY
+	bne	S, 2b
+
+	br	$q_low_ret
+
+	.align	4
+$fix_sign_in:
+	/* If we got here, then X|Y is negative.  Need to adjust everything
+	   such that we're doing unsigned division in the fixup loop.  */
+	/* T5 is true if result should be negative.  */
+	xor	X, Y, AT
+	cmplt	AT, 0, t5
+	cmplt	X, 0, AT
+	negq	X, t0
+
+	cmovne	AT, t0, X
+	cmplt	Y, 0, AT
+	negq	Y, t0
+
+	cmovne	AT, t0, Y
+	blbc	t5, $fix_sign_in_ret1
+
+	cvttq/c	$f0, $f0
+	_FTOIT	$f0, Q, 8
+	.align	3
+	negq	Q, Q
+	br	$fix_sign_in_ret2
+
+$divbyzero:
+	mov	a0, v0
+	lda	a0, GEN_INTDIV
+	call_pal PAL_gentrap
+	stq	zero, 0(v0)
+	stq	zero, 8(v0)
+
+#if FRAME > 0
+	lda	sp, FRAME(sp)
+#endif
+	ret
+
+	.end	ldiv
+
+weak_alias (ldiv, lldiv)
+weak_alias (ldiv, imaxdiv)