Prepare for radical source tree reorganization.zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 90 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/arm/add_n.S b/REORG.TODO/sysdeps/arm/add_n.S
new file mode 100644
index 0000000000..811a769959
--- /dev/null
+++ b/REORG.TODO/sysdeps/arm/add_n.S
@@ -0,0 +1,90 @@
+/* mpn_add_n -- add (or subtract) bignums.
+   Copyright (C) 2013-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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>
+#include <arm-features.h>
+
+	.syntax unified
+	.text
+
+#ifdef USE_AS_SUB_N
+# define INITC	cmp r0, r0
+# define OPC	sbcs
+# define RETC	sbc r0, r0, r0; neg r0, r0
+# define FUNC	__mpn_sub_n
+#else
+# define INITC	cmn r0, #0
+# define OPC	adcs
+# define RETC	mov r0, #0; adc r0, r0, r0
+# define FUNC	__mpn_add_n
+#endif
+
+/* mp_limb_t mpn_add_n(res_ptr, src1_ptr, src2_ptr, size) */
+
+ENTRY (FUNC)
+	push	{ r4, r5, r6, r7, r8, r10, lr }
+	cfi_adjust_cfa_offset (28)
+	cfi_rel_offset (r4, 0)
+	cfi_rel_offset (r5, 4)
+	cfi_rel_offset (r6, 8)
+	cfi_rel_offset (r7, 12)
+	cfi_rel_offset (r8, 16)
+	cfi_rel_offset (r10, 20)
+	cfi_rel_offset (lr, 24)
+
+	INITC				/* initialize carry flag */
+	tst	r3, #1			/* count & 1 == 1? */
+	add	lr, r1, r3, lsl #2	/* compute end src1 */
+	beq	1f
+
+	ldr	r4, [r1], #4		/* do one to make count even */
+	ldr	r5, [r2], #4
+	OPC	r4, r4, r5
+	teq	r1, lr			/* end of count? (preserve carry) */
+	str	r4, [r0], #4
+	beq	9f
+1:
+	tst	r3, #2			/* count & 2 == 2?  */
+	beq	2f
+	ldm	r1!, { r4, r5 }		/* do two to make count 0 mod 4 */
+	ldm	r2!, { r6, r7 }
+	OPC	r4, r4, r6
+	OPC	r5, r5, r7
+	teq	r1, lr			/* end of count? */
+	stm	r0!, { r4, r5 }
+	beq	9f
+2:
+	ldm	r1!, { r3, r5, r7, r10 }	/* do four each loop */
+	ldm	r2!, { r4, r6, r8, ip }
+	OPC	r3, r3, r4
+	OPC	r5, r5, r6
+	OPC	r7, r7, r8
+	OPC	r10, r10, ip
+	teq	r1, lr
+	stm	r0!, { r3, r5, r7, r10 }
+	bne	2b
+
+9:
+	RETC				/* copy carry out */
+#ifndef ARM_ALWAYS_BX
+	pop	{ r4, r5, r6, r7, r8, r10, pc }
+#else
+	pop	{ r4, r5, r6, r7, r8, r10, lr }
+	bx	lr
+#endif
+END (FUNC)