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, 315 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/x86_64/memchr.S b/REORG.TODO/sysdeps/x86_64/memchr.S
new file mode 100644
index 0000000000..d3be012424
--- /dev/null
+++ b/REORG.TODO/sysdeps/x86_64/memchr.S
@@ -0,0 +1,315 @@
+/* Copyright (C) 2011-2017 Free Software Foundation, Inc.
+   Contributed by Intel Corporation.
+   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>
+
+/* fast SSE2 version with using pmaxub and 64 byte loop */
+
+	.text
+ENTRY(memchr)
+	movd	%esi, %xmm1
+	mov	%edi, %ecx
+
+	punpcklbw %xmm1, %xmm1
+	test	%rdx, %rdx
+	jz	L(return_null)
+	punpcklbw %xmm1, %xmm1
+
+	and	$63, %ecx
+	pshufd	$0, %xmm1, %xmm1
+
+	cmp	$48, %ecx
+	ja	L(crosscache)
+
+	movdqu	(%rdi), %xmm0
+	pcmpeqb	%xmm1, %xmm0
+	pmovmskb %xmm0, %eax
+	test	%eax, %eax
+
+	jnz	L(matches_1)
+	sub	$16, %rdx
+	jbe	L(return_null)
+	add	$16, %rdi
+	and	$15, %ecx
+	and	$-16, %rdi
+	add	%rcx, %rdx
+	sub	$64, %rdx
+	jbe	L(exit_loop)
+	jmp	L(loop_prolog)
+
+	.p2align 4
+L(crosscache):
+	and	$15, %ecx
+	and	$-16, %rdi
+	movdqa	(%rdi), %xmm0
+
+	pcmpeqb	%xmm1, %xmm0
+/* Check if there is a match.  */
+	pmovmskb %xmm0, %eax
+/* Remove the leading bytes.  */
+	sar	%cl, %eax
+	test	%eax, %eax
+	je	L(unaligned_no_match)
+/* Check which byte is a match.  */
+	bsf	%eax, %eax
+
+	sub	%rax, %rdx
+	jbe	L(return_null)
+	add	%rdi, %rax
+	add	%rcx, %rax
+	ret
+
+	.p2align 4
+L(unaligned_no_match):
+        /* "rcx" is less than 16.  Calculate "rdx + rcx - 16" by using
+	   "rdx - (16 - rcx)" instead of "(rdx + rcx) - 16" to void
+	   possible addition overflow.  */
+	neg	%rcx
+	add	$16, %rcx
+	sub	%rcx, %rdx
+	jbe	L(return_null)
+	add	$16, %rdi
+	sub	$64, %rdx
+	jbe	L(exit_loop)
+
+	.p2align 4
+L(loop_prolog):
+	movdqa	(%rdi), %xmm0
+	pcmpeqb	%xmm1, %xmm0
+	pmovmskb %xmm0, %eax
+	test	%eax, %eax
+	jnz	L(matches)
+
+	movdqa	16(%rdi), %xmm2
+	pcmpeqb	%xmm1, %xmm2
+	pmovmskb %xmm2, %eax
+	test	%eax, %eax
+	jnz	L(matches16)
+
+	movdqa	32(%rdi), %xmm3
+	pcmpeqb	%xmm1, %xmm3
+	pmovmskb %xmm3, %eax
+	test	%eax, %eax
+	jnz	L(matches32)
+
+	movdqa	48(%rdi), %xmm4
+	pcmpeqb	%xmm1, %xmm4
+	add	$64, %rdi
+	pmovmskb %xmm4, %eax
+	test	%eax, %eax
+	jnz	L(matches0)
+
+	test	$0x3f, %rdi
+	jz	L(align64_loop)
+
+	sub	$64, %rdx
+	jbe	L(exit_loop)
+
+	movdqa	(%rdi), %xmm0
+	pcmpeqb	%xmm1, %xmm0
+	pmovmskb %xmm0, %eax
+	test	%eax, %eax
+	jnz	L(matches)
+
+	movdqa	16(%rdi), %xmm2
+	pcmpeqb	%xmm1, %xmm2
+	pmovmskb %xmm2, %eax
+	test	%eax, %eax
+	jnz	L(matches16)
+
+	movdqa	32(%rdi), %xmm3
+	pcmpeqb	%xmm1, %xmm3
+	pmovmskb %xmm3, %eax
+	test	%eax, %eax
+	jnz	L(matches32)
+
+	movdqa	48(%rdi), %xmm3
+	pcmpeqb	%xmm1, %xmm3
+	pmovmskb %xmm3, %eax
+
+	add	$64, %rdi
+	test	%eax, %eax
+	jnz	L(matches0)
+
+	mov	%rdi, %rcx
+	and	$-64, %rdi
+	and	$63, %ecx
+	add	%rcx, %rdx
+
+	.p2align 4
+L(align64_loop):
+	sub	$64, %rdx
+	jbe	L(exit_loop)
+	movdqa	(%rdi), %xmm0
+	movdqa	16(%rdi), %xmm2
+	movdqa	32(%rdi), %xmm3
+	movdqa	48(%rdi), %xmm4
+
+	pcmpeqb	%xmm1, %xmm0
+	pcmpeqb	%xmm1, %xmm2
+	pcmpeqb	%xmm1, %xmm3
+	pcmpeqb	%xmm1, %xmm4
+
+	pmaxub	%xmm0, %xmm3
+	pmaxub	%xmm2, %xmm4
+	pmaxub	%xmm3, %xmm4
+	pmovmskb %xmm4, %eax
+
+	add	$64, %rdi
+
+	test	%eax, %eax
+	jz	L(align64_loop)
+
+	sub	$64, %rdi
+
+	pmovmskb %xmm0, %eax
+	test	%eax, %eax
+	jnz	L(matches)
+
+	pmovmskb %xmm2, %eax
+	test	%eax, %eax
+	jnz	L(matches16)
+
+	movdqa	32(%rdi), %xmm3
+	pcmpeqb	%xmm1, %xmm3
+
+	pcmpeqb	48(%rdi), %xmm1
+	pmovmskb %xmm3, %eax
+	test	%eax, %eax
+	jnz	L(matches32)
+
+	pmovmskb %xmm1, %eax
+	bsf	%eax, %eax
+	lea	48(%rdi, %rax), %rax
+	ret
+
+	.p2align 4
+L(exit_loop):
+	add	$32, %edx
+	jle	L(exit_loop_32)
+
+	movdqa	(%rdi), %xmm0
+	pcmpeqb	%xmm1, %xmm0
+	pmovmskb %xmm0, %eax
+	test	%eax, %eax
+	jnz	L(matches)
+
+	movdqa	16(%rdi), %xmm2
+	pcmpeqb	%xmm1, %xmm2
+	pmovmskb %xmm2, %eax
+	test	%eax, %eax
+	jnz	L(matches16)
+
+	movdqa	32(%rdi), %xmm3
+	pcmpeqb	%xmm1, %xmm3
+	pmovmskb %xmm3, %eax
+	test	%eax, %eax
+	jnz	L(matches32_1)
+	sub	$16, %edx
+	jle	L(return_null)
+
+	pcmpeqb	48(%rdi), %xmm1
+	pmovmskb %xmm1, %eax
+	test	%eax, %eax
+	jnz	L(matches48_1)
+	xor	%eax, %eax
+	ret
+
+	.p2align 4
+L(exit_loop_32):
+	add	$32, %edx
+	movdqa	(%rdi), %xmm0
+	pcmpeqb	%xmm1, %xmm0
+	pmovmskb %xmm0, %eax
+	test	%eax, %eax
+	jnz	L(matches_1)
+	sub	$16, %edx
+	jbe	L(return_null)
+
+	pcmpeqb	16(%rdi), %xmm1
+	pmovmskb %xmm1, %eax
+	test	%eax, %eax
+	jnz	L(matches16_1)
+	xor	%eax, %eax
+	ret
+
+	.p2align 4
+L(matches0):
+	bsf	%eax, %eax
+	lea	-16(%rax, %rdi), %rax
+	ret
+
+	.p2align 4
+L(matches):
+	bsf	%eax, %eax
+	add	%rdi, %rax
+	ret
+
+	.p2align 4
+L(matches16):
+	bsf	%eax, %eax
+	lea	16(%rax, %rdi), %rax
+	ret
+
+	.p2align 4
+L(matches32):
+	bsf	%eax, %eax
+	lea	32(%rax, %rdi), %rax
+	ret
+
+	.p2align 4
+L(matches_1):
+	bsf	%eax, %eax
+	sub	%rax, %rdx
+	jbe	L(return_null)
+	add	%rdi, %rax
+	ret
+
+	.p2align 4
+L(matches16_1):
+	bsf	%eax, %eax
+	sub	%rax, %rdx
+	jbe	L(return_null)
+	lea	16(%rdi, %rax), %rax
+	ret
+
+	.p2align 4
+L(matches32_1):
+	bsf	%eax, %eax
+	sub	%rax, %rdx
+	jbe	L(return_null)
+	lea	32(%rdi, %rax), %rax
+	ret
+
+	.p2align 4
+L(matches48_1):
+	bsf	%eax, %eax
+	sub	%rax, %rdx
+	jbe	L(return_null)
+	lea	48(%rdi, %rax), %rax
+	ret
+
+	.p2align 4
+L(return_null):
+	xor	%eax, %eax
+	ret
+END(memchr)
+
+strong_alias (memchr, __memchr)
+
+libc_hidden_builtin_def(memchr)