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, 263 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S b/REORG.TODO/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S
new file mode 100644
index 0000000000..2eb9e3744e
--- /dev/null
+++ b/REORG.TODO/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S
@@ -0,0 +1,263 @@
+/* memset/bzero with unaligned store and rep stosb
+   Copyright (C) 2016-2017 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/>.  */
+
+/* memset is implemented as:
+   1. Use overlapping store to avoid branch.
+   2. If size is less than VEC, use integer register stores.
+   3. If size is from VEC_SIZE to 2 * VEC_SIZE, use 2 VEC stores.
+   4. If size is from 2 * VEC_SIZE to 4 * VEC_SIZE, use 4 VEC stores.
+   5. If size is more to 4 * VEC_SIZE, align to 4 * VEC_SIZE with
+      4 VEC stores and store 4 * VEC at a time until done.  */
+
+#include <sysdep.h>
+
+#ifndef MEMSET_CHK_SYMBOL
+# define MEMSET_CHK_SYMBOL(p,s)		MEMSET_SYMBOL(p, s)
+#endif
+
+#ifndef WMEMSET_CHK_SYMBOL
+# define WMEMSET_CHK_SYMBOL(p,s)	WMEMSET_SYMBOL(p, s)
+#endif
+
+#ifndef VZEROUPPER
+# if VEC_SIZE > 16
+#  define VZEROUPPER			vzeroupper
+# else
+#  define VZEROUPPER
+# endif
+#endif
+
+#ifndef VZEROUPPER_SHORT_RETURN
+# if VEC_SIZE > 16
+#  define VZEROUPPER_SHORT_RETURN	vzeroupper
+# else
+#  define VZEROUPPER_SHORT_RETURN	rep
+# endif
+#endif
+
+#ifndef MOVQ
+# if VEC_SIZE > 16
+#  define MOVQ				vmovq
+# else
+#  define MOVQ				movq
+# endif
+#endif
+
+/* Threshold to use Enhanced REP STOSB.  Since there is overhead to set
+   up REP STOSB operation, REP STOSB isn't faster on short data.  The
+   memset micro benchmark in glibc shows that 2KB is the approximate
+   value above which REP STOSB becomes faster on processors with
+   Enhanced REP STOSB.  Since the stored value is fixed, larger register
+   size has minimal impact on threshold.  */
+#ifndef REP_STOSB_THRESHOLD
+# define REP_STOSB_THRESHOLD		2048
+#endif
+
+#ifndef SECTION
+# error SECTION is not defined!
+#endif
+
+	.section SECTION(.text),"ax",@progbits
+#if VEC_SIZE == 16 && IS_IN (libc)
+ENTRY (__bzero)
+	movq	%rdi, %rax /* Set return value.  */
+	movq	%rsi, %rdx /* Set n.  */
+	pxor	%xmm0, %xmm0
+	jmp	L(entry_from_bzero)
+END (__bzero)
+weak_alias (__bzero, bzero)
+#endif
+
+#if IS_IN (libc)
+# if defined SHARED
+ENTRY_CHK (WMEMSET_CHK_SYMBOL (__wmemset_chk, unaligned))
+	cmpq	%rdx, %rcx
+	jb	HIDDEN_JUMPTARGET (__chk_fail)
+END_CHK (WMEMSET_CHK_SYMBOL (__wmemset_chk, unaligned))
+# endif
+
+ENTRY (WMEMSET_SYMBOL (__wmemset, unaligned))
+	shlq	$2, %rdx
+	WMEMSET_VDUP_TO_VEC0_AND_SET_RETURN (%esi, %rdi)
+	jmp	L(entry_from_bzero)
+END (WMEMSET_SYMBOL (__wmemset, unaligned))
+#endif
+
+#if defined SHARED && IS_IN (libc)
+ENTRY_CHK (MEMSET_CHK_SYMBOL (__memset_chk, unaligned))
+	cmpq	%rdx, %rcx
+	jb	HIDDEN_JUMPTARGET (__chk_fail)
+END_CHK (MEMSET_CHK_SYMBOL (__memset_chk, unaligned))
+#endif
+
+ENTRY (MEMSET_SYMBOL (__memset, unaligned))
+	MEMSET_VDUP_TO_VEC0_AND_SET_RETURN (%esi, %rdi)
+L(entry_from_bzero):
+	cmpq	$VEC_SIZE, %rdx
+	jb	L(less_vec)
+	cmpq	$(VEC_SIZE * 2), %rdx
+	ja	L(more_2x_vec)
+	/* From VEC and to 2 * VEC.  No branch when size == VEC_SIZE.  */
+	VMOVU	%VEC(0), -VEC_SIZE(%rdi,%rdx)
+	VMOVU	%VEC(0), (%rdi)
+	VZEROUPPER
+	ret
+#if defined USE_MULTIARCH && IS_IN (libc)
+END (MEMSET_SYMBOL (__memset, unaligned))
+
+# if VEC_SIZE == 16
+/* Only used to measure performance of REP STOSB.  */
+ENTRY (__memset_erms)
+# else
+/* Provide a symbol to debugger.  */
+ENTRY (MEMSET_SYMBOL (__memset, erms))
+# endif
+L(stosb):
+	/* Issue vzeroupper before rep stosb.  */
+	VZEROUPPER
+	movq	%rdx, %rcx
+	movzbl	%sil, %eax
+	movq	%rdi, %rdx
+	rep stosb
+	movq	%rdx, %rax
+	ret
+# if VEC_SIZE == 16
+END (__memset_erms)
+# else
+END (MEMSET_SYMBOL (__memset, erms))
+# endif
+
+# if defined SHARED && IS_IN (libc)
+ENTRY_CHK (MEMSET_CHK_SYMBOL (__memset_chk, unaligned_erms))
+	cmpq	%rdx, %rcx
+	jb	HIDDEN_JUMPTARGET (__chk_fail)
+END_CHK (MEMSET_CHK_SYMBOL (__memset_chk, unaligned_erms))
+# endif
+
+ENTRY (MEMSET_SYMBOL (__memset, unaligned_erms))
+	MEMSET_VDUP_TO_VEC0_AND_SET_RETURN (%esi, %rdi)
+	cmpq	$VEC_SIZE, %rdx
+	jb	L(less_vec)
+	cmpq	$(VEC_SIZE * 2), %rdx
+	ja	L(stosb_more_2x_vec)
+	/* From VEC and to 2 * VEC.  No branch when size == VEC_SIZE.  */
+	VMOVU	%VEC(0), -VEC_SIZE(%rdi,%rdx)
+	VMOVU	%VEC(0), (%rdi)
+	VZEROUPPER
+	ret
+
+L(stosb_more_2x_vec):
+	cmpq	$REP_STOSB_THRESHOLD, %rdx
+	ja	L(stosb)
+#endif
+L(more_2x_vec):
+	cmpq  $(VEC_SIZE * 4), %rdx
+	ja	L(loop_start)
+	VMOVU	%VEC(0), (%rdi)
+	VMOVU	%VEC(0), VEC_SIZE(%rdi)
+	VMOVU	%VEC(0), -VEC_SIZE(%rdi,%rdx)
+	VMOVU	%VEC(0), -(VEC_SIZE * 2)(%rdi,%rdx)
+L(return):
+	VZEROUPPER
+	ret
+
+L(loop_start):
+	leaq	(VEC_SIZE * 4)(%rdi), %rcx
+	VMOVU	%VEC(0), (%rdi)
+	andq	$-(VEC_SIZE * 4), %rcx
+	VMOVU	%VEC(0), -VEC_SIZE(%rdi,%rdx)
+	VMOVU	%VEC(0), VEC_SIZE(%rdi)
+	VMOVU	%VEC(0), -(VEC_SIZE * 2)(%rdi,%rdx)
+	VMOVU	%VEC(0), (VEC_SIZE * 2)(%rdi)
+	VMOVU	%VEC(0), -(VEC_SIZE * 3)(%rdi,%rdx)
+	VMOVU	%VEC(0), (VEC_SIZE * 3)(%rdi)
+	VMOVU	%VEC(0), -(VEC_SIZE * 4)(%rdi,%rdx)
+	addq	%rdi, %rdx
+	andq	$-(VEC_SIZE * 4), %rdx
+	cmpq	%rdx, %rcx
+	je	L(return)
+L(loop):
+	VMOVA	%VEC(0), (%rcx)
+	VMOVA	%VEC(0), VEC_SIZE(%rcx)
+	VMOVA	%VEC(0), (VEC_SIZE * 2)(%rcx)
+	VMOVA	%VEC(0), (VEC_SIZE * 3)(%rcx)
+	addq	$(VEC_SIZE * 4), %rcx
+	cmpq	%rcx, %rdx
+	jne	L(loop)
+	VZEROUPPER_SHORT_RETURN
+	ret
+L(less_vec):
+	/* Less than 1 VEC.  */
+# if VEC_SIZE != 16 && VEC_SIZE != 32 && VEC_SIZE != 64
+#  error Unsupported VEC_SIZE!
+# endif
+# if VEC_SIZE > 32
+	cmpb	$32, %dl
+	jae	L(between_32_63)
+# endif
+# if VEC_SIZE > 16
+	cmpb	$16, %dl
+	jae	L(between_16_31)
+# endif
+	MOVQ	%xmm0, %rcx
+	cmpb	$8, %dl
+	jae	L(between_8_15)
+	cmpb	$4, %dl
+	jae	L(between_4_7)
+	cmpb	$1, %dl
+	ja	L(between_2_3)
+	jb	1f
+	movb	%cl, (%rdi)
+1:
+	VZEROUPPER
+	ret
+# if VEC_SIZE > 32
+	/* From 32 to 63.  No branch when size == 32.  */
+L(between_32_63):
+	vmovdqu	%ymm0, -32(%rdi,%rdx)
+	vmovdqu	%ymm0, (%rdi)
+	VZEROUPPER
+	ret
+# endif
+# if VEC_SIZE > 16
+	/* From 16 to 31.  No branch when size == 16.  */
+L(between_16_31):
+	vmovdqu	%xmm0, -16(%rdi,%rdx)
+	vmovdqu	%xmm0, (%rdi)
+	VZEROUPPER
+	ret
+# endif
+	/* From 8 to 15.  No branch when size == 8.  */
+L(between_8_15):
+	movq	%rcx, -8(%rdi,%rdx)
+	movq	%rcx, (%rdi)
+	VZEROUPPER
+	ret
+L(between_4_7):
+	/* From 4 to 7.  No branch when size == 4.  */
+	movl	%ecx, -4(%rdi,%rdx)
+	movl	%ecx, (%rdi)
+	VZEROUPPER
+	ret
+L(between_2_3):
+	/* From 2 to 3.  No branch when size == 2.  */
+	movw	%cx, -2(%rdi,%rdx)
+	movw	%cx, (%rdi)
+	VZEROUPPER
+	ret
+END (MEMSET_SYMBOL (__memset, unaligned_erms))