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-rw-r--r--sysdeps/x86_64/multiarch/Makefile1
-rw-r--r--sysdeps/x86_64/multiarch/ifunc-impl-list.c7
-rw-r--r--sysdeps/x86_64/multiarch/memrchr-avx2.S359
-rw-r--r--sysdeps/x86_64/multiarch/memrchr-sse2.S26
-rw-r--r--sysdeps/x86_64/multiarch/memrchr.c31
5 files changed, 424 insertions, 0 deletions
diff --git a/sysdeps/x86_64/multiarch/Makefile b/sysdeps/x86_64/multiarch/Makefile
index 4523f51095..2fa390b3dd 100644
--- a/sysdeps/x86_64/multiarch/Makefile
+++ b/sysdeps/x86_64/multiarch/Makefile
@@ -7,6 +7,7 @@ ifeq ($(subdir),string)
 sysdep_routines += strncat-c stpncpy-c strncpy-c strcmp-ssse3 \
 		   strcmp-sse2-unaligned strncmp-ssse3 \
 		   memchr-sse2 rawmemchr-sse2 memchr-avx2 rawmemchr-avx2 \
+		   memrchr-sse2 memrchr-avx2 \
 		   memcmp-avx2-movbe \
 		   memcmp-sse4 memcpy-ssse3 \
 		   memmove-ssse3 \
diff --git a/sysdeps/x86_64/multiarch/ifunc-impl-list.c b/sysdeps/x86_64/multiarch/ifunc-impl-list.c
index 8dda1b040a..5670eb7e9e 100644
--- a/sysdeps/x86_64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/x86_64/multiarch/ifunc-impl-list.c
@@ -112,6 +112,13 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 	      IFUNC_IMPL_ADD (array, i, memmove, 1,
 			      __memmove_sse2_unaligned_erms))
 
+  /* Support sysdeps/x86_64/multiarch/memrchr.S.  */
+  IFUNC_IMPL (i, name, memrchr,
+	      IFUNC_IMPL_ADD (array, i, memrchr,
+			      HAS_ARCH_FEATURE (AVX2_Usable),
+			      __memrchr_avx2)
+	      IFUNC_IMPL_ADD (array, i, memrchr, 1, __memrchr_sse2))
+
   /* Support sysdeps/x86_64/multiarch/memset_chk.S.  */
   IFUNC_IMPL (i, name, __memset_chk,
 	      IFUNC_IMPL_ADD (array, i, __memset_chk, 1,
diff --git a/sysdeps/x86_64/multiarch/memrchr-avx2.S b/sysdeps/x86_64/multiarch/memrchr-avx2.S
new file mode 100644
index 0000000000..3ee02e1cc3
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/memrchr-avx2.S
@@ -0,0 +1,359 @@
+/* memrchr optimized with AVX2.
+   Copyright (C) 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/>.  */
+
+#if IS_IN (libc)
+
+# include <sysdep.h>
+
+# ifndef VZEROUPPER
+#  define VZEROUPPER	vzeroupper
+# endif
+
+# define VEC_SIZE 32
+
+	.section .text.avx,"ax",@progbits
+ENTRY (__memrchr_avx2)
+	/* Broadcast CHAR to YMM0.  */
+	vmovd	%esi, %xmm0
+	vpbroadcastb %xmm0, %ymm0
+
+	subq	$VEC_SIZE, %rdx
+	jbe	L(last_vec_or_less)
+
+	addq	%rdx, %rdi
+
+	/* Check the last VEC_SIZE bytes.  */
+	vpcmpeqb (%rdi), %ymm0, %ymm1
+	vpmovmskb %ymm1, %eax
+	testl	%eax, %eax
+	jnz	L(last_vec_x0)
+
+	subq	$(VEC_SIZE * 4), %rdi
+	movl	%edi, %ecx
+	andl	$(VEC_SIZE - 1), %ecx
+	jz	L(aligned_more)
+
+	/* Align data for aligned loads in the loop.  */
+	addq	$VEC_SIZE, %rdi
+	addq	$VEC_SIZE, %rdx
+	andq	$-VEC_SIZE, %rdi
+	subq	%rcx, %rdx
+
+	.p2align 4
+L(aligned_more):
+	subq	$(VEC_SIZE * 4), %rdx
+	jbe	L(last_4x_vec_or_less)
+
+	/* Check the last 4 * VEC_SIZE.  Only one VEC_SIZE at a time
+	   since data is only aligned to VEC_SIZE.  */
+	vpcmpeqb (VEC_SIZE * 3)(%rdi), %ymm0, %ymm1
+	vpmovmskb %ymm1, %eax
+	testl	%eax, %eax
+	jnz	L(last_vec_x3)
+
+	vpcmpeqb (VEC_SIZE * 2)(%rdi), %ymm0, %ymm2
+	vpmovmskb %ymm2, %eax
+	testl	%eax, %eax
+	jnz	L(last_vec_x2)
+
+	vpcmpeqb VEC_SIZE(%rdi), %ymm0, %ymm3
+	vpmovmskb %ymm3, %eax
+	testl	%eax, %eax
+	jnz	L(last_vec_x1)
+
+	vpcmpeqb (%rdi), %ymm0, %ymm4
+	vpmovmskb %ymm4, %eax
+	testl	%eax, %eax
+	jnz	L(last_vec_x0)
+
+	/* Align data to 4 * VEC_SIZE for loop with fewer branches.
+	   There are some overlaps with above if data isn't aligned
+	   to 4 * VEC_SIZE.  */
+	movl	%edi, %ecx
+	andl	$(VEC_SIZE * 4 - 1), %ecx
+	jz	L(loop_4x_vec)
+
+	addq	$(VEC_SIZE * 4), %rdi
+	addq	$(VEC_SIZE * 4), %rdx
+	andq	$-(VEC_SIZE * 4), %rdi
+	subq	%rcx, %rdx
+
+	.p2align 4
+L(loop_4x_vec):
+	/* Compare 4 * VEC at a time forward.  */
+	subq	$(VEC_SIZE * 4), %rdi
+	subq	$(VEC_SIZE * 4), %rdx
+	jbe	L(last_4x_vec_or_less)
+
+	vmovdqa	(%rdi), %ymm1
+	vmovdqa	VEC_SIZE(%rdi), %ymm2
+	vmovdqa	(VEC_SIZE * 2)(%rdi), %ymm3
+	vmovdqa	(VEC_SIZE * 3)(%rdi), %ymm4
+
+	vpcmpeqb %ymm1, %ymm0, %ymm1
+	vpcmpeqb %ymm2, %ymm0, %ymm2
+	vpcmpeqb %ymm3, %ymm0, %ymm3
+	vpcmpeqb %ymm4, %ymm0, %ymm4
+
+	vpor	%ymm1, %ymm2, %ymm5
+	vpor	%ymm3, %ymm4, %ymm6
+	vpor	%ymm5, %ymm6, %ymm5
+
+	vpmovmskb %ymm5, %eax
+	testl	%eax, %eax
+	jz	L(loop_4x_vec)
+
+	/* There is a match.  */
+	vpmovmskb %ymm4, %eax
+	testl	%eax, %eax
+	jnz	L(last_vec_x3)
+
+	vpmovmskb %ymm3, %eax
+	testl	%eax, %eax
+	jnz	L(last_vec_x2)
+
+	vpmovmskb %ymm2, %eax
+	testl	%eax, %eax
+	jnz	L(last_vec_x1)
+
+	vpmovmskb %ymm1, %eax
+	bsrl	%eax, %eax
+	addq	%rdi, %rax
+	VZEROUPPER
+	ret
+
+	.p2align 4
+L(last_4x_vec_or_less):
+	addl	$(VEC_SIZE * 4), %edx
+	cmpl	$(VEC_SIZE * 2), %edx
+	jbe	L(last_2x_vec)
+
+	vpcmpeqb (VEC_SIZE * 3)(%rdi), %ymm0, %ymm1
+	vpmovmskb %ymm1, %eax
+	testl	%eax, %eax
+	jnz	L(last_vec_x3)
+
+	vpcmpeqb (VEC_SIZE * 2)(%rdi), %ymm0, %ymm2
+	vpmovmskb %ymm2, %eax
+	testl	%eax, %eax
+	jnz	L(last_vec_x2)
+
+	vpcmpeqb VEC_SIZE(%rdi), %ymm0, %ymm3
+	vpmovmskb %ymm3, %eax
+	testl	%eax, %eax
+	jnz	L(last_vec_x1_check)
+	cmpl	$(VEC_SIZE * 3), %edx
+	jbe	L(zero)
+
+	vpcmpeqb (%rdi), %ymm0, %ymm4
+	vpmovmskb %ymm4, %eax
+	testl	%eax, %eax
+	jz	L(zero)
+	bsrl	%eax, %eax
+	subq	$(VEC_SIZE * 4), %rdx
+	addq	%rax, %rdx
+	jl	L(zero)
+	addq	%rdi, %rax
+	VZEROUPPER
+	ret
+
+	.p2align 4
+L(last_2x_vec):
+	vpcmpeqb (VEC_SIZE * 3)(%rdi), %ymm0, %ymm1
+	vpmovmskb %ymm1, %eax
+	testl	%eax, %eax
+	jnz	L(last_vec_x3_check)
+	cmpl	$VEC_SIZE, %edx
+	jbe	L(zero)
+
+	vpcmpeqb (VEC_SIZE * 2)(%rdi), %ymm0, %ymm1
+	vpmovmskb %ymm1, %eax
+	testl	%eax, %eax
+	jz	L(zero)
+	bsrl	%eax, %eax
+	subq	$(VEC_SIZE * 2), %rdx
+	addq	%rax, %rdx
+	jl	L(zero)
+	addl	$(VEC_SIZE * 2), %eax
+	addq	%rdi, %rax
+	VZEROUPPER
+	ret
+
+	.p2align 4
+L(last_vec_x0):
+	bsrl	%eax, %eax
+	addq	%rdi, %rax
+	VZEROUPPER
+	ret
+
+	.p2align 4
+L(last_vec_x1):
+	bsrl	%eax, %eax
+	addl	$VEC_SIZE, %eax
+	addq	%rdi, %rax
+	VZEROUPPER
+	ret
+
+	.p2align 4
+L(last_vec_x2):
+	bsrl	%eax, %eax
+	addl	$(VEC_SIZE * 2), %eax
+	addq	%rdi, %rax
+	VZEROUPPER
+	ret
+
+	.p2align 4
+L(last_vec_x3):
+	bsrl	%eax, %eax
+	addl	$(VEC_SIZE * 3), %eax
+	addq	%rdi, %rax
+	ret
+
+	.p2align 4
+L(last_vec_x1_check):
+	bsrl	%eax, %eax
+	subq	$(VEC_SIZE * 3), %rdx
+	addq	%rax, %rdx
+	jl	L(zero)
+	addl	$VEC_SIZE, %eax
+	addq	%rdi, %rax
+	VZEROUPPER
+	ret
+
+	.p2align 4
+L(last_vec_x3_check):
+	bsrl	%eax, %eax
+	subq	$VEC_SIZE, %rdx
+	addq	%rax, %rdx
+	jl	L(zero)
+	addl	$(VEC_SIZE * 3), %eax
+	addq	%rdi, %rax
+	VZEROUPPER
+	ret
+
+	.p2align 4
+L(zero):
+	VZEROUPPER
+L(null):
+	xorl	%eax, %eax
+	ret
+
+	.p2align 4
+L(last_vec_or_less_aligned):
+	movl	%edx, %ecx
+
+	vpcmpeqb (%rdi), %ymm0, %ymm1
+
+	movl	$1, %edx
+	/* Support rdx << 32.  */
+	salq	%cl, %rdx
+	subq	$1, %rdx
+
+	vpmovmskb %ymm1, %eax
+
+	/* Remove the trailing bytes.  */
+	andl	%edx, %eax
+	testl	%eax, %eax
+	jz	L(zero)
+
+	bsrl	%eax, %eax
+	addq	%rdi, %rax
+	VZEROUPPER
+	ret
+
+	.p2align 4
+L(last_vec_or_less):
+	addl	$VEC_SIZE, %edx
+
+	/* Check for zero length.  */
+	testl	%edx, %edx
+	jz	L(null)
+
+	movl	%edi, %ecx
+	andl	$(VEC_SIZE - 1), %ecx
+	jz	L(last_vec_or_less_aligned)
+
+	movl	%ecx, %esi
+	movl	%ecx, %r8d
+	addl	%edx, %esi
+	andq	$-VEC_SIZE, %rdi
+
+	subl	$VEC_SIZE, %esi
+	ja	L(last_vec_2x_aligned)
+
+	/* Check the last VEC.  */
+	vpcmpeqb (%rdi), %ymm0, %ymm1
+	vpmovmskb %ymm1, %eax
+
+	/* Remove the leading and trailing bytes.  */
+	sarl	%cl, %eax
+	movl	%edx, %ecx
+
+	movl	$1, %edx
+	sall	%cl, %edx
+	subl	$1, %edx
+
+	andl	%edx, %eax
+	testl	%eax, %eax
+	jz	L(zero)
+
+	bsrl	%eax, %eax
+	addq	%rdi, %rax
+	addq	%r8, %rax
+	VZEROUPPER
+	ret
+
+	.p2align 4
+L(last_vec_2x_aligned):
+	movl	%esi, %ecx
+
+	/* Check the last VEC.  */
+	vpcmpeqb VEC_SIZE(%rdi), %ymm0, %ymm1
+
+	movl	$1, %edx
+	sall	%cl, %edx
+	subl	$1, %edx
+
+	vpmovmskb %ymm1, %eax
+
+	/* Remove the trailing bytes.  */
+	andl	%edx, %eax
+
+	testl	%eax, %eax
+	jnz	L(last_vec_x1)
+
+	/* Check the second last VEC.  */
+	vpcmpeqb (%rdi), %ymm0, %ymm1
+
+	movl	%r8d, %ecx
+
+	vpmovmskb %ymm1, %eax
+
+	/* Remove the leading bytes.  Must use unsigned right shift for
+	   bsrl below.  */
+	shrl	%cl, %eax
+	testl	%eax, %eax
+	jz	L(zero)
+
+	bsrl	%eax, %eax
+	addq	%rdi, %rax
+	addq	%r8, %rax
+	VZEROUPPER
+	ret
+END (__memrchr_avx2)
+#endif
diff --git a/sysdeps/x86_64/multiarch/memrchr-sse2.S b/sysdeps/x86_64/multiarch/memrchr-sse2.S
new file mode 100644
index 0000000000..f518819c87
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/memrchr-sse2.S
@@ -0,0 +1,26 @@
+/* memrchr optimized with SSE2.
+   Copyright (C) 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/>.  */
+
+#if IS_IN (libc)
+# define __memrchr __memrchr_sse2
+
+# undef weak_alias
+# define weak_alias(__memrchr, memrchr)
+#endif
+
+#include "../memrchr.S"
diff --git a/sysdeps/x86_64/multiarch/memrchr.c b/sysdeps/x86_64/multiarch/memrchr.c
new file mode 100644
index 0000000000..003d403106
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/memrchr.c
@@ -0,0 +1,31 @@
+/* Multiple versions of memrchr
+   All versions must be listed in ifunc-impl-list.c.
+   Copyright (C) 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/>.  */
+
+/* Define multiple versions only for the definition in libc. */
+#if IS_IN (libc)
+# define memrchr __redirect_memrchr
+# include <string.h>
+# undef memrchr
+
+# define SYMBOL_NAME memrchr
+# include "ifunc-avx2.h"
+
+libc_ifunc_redirected (__redirect_memrchr, __memrchr, IFUNC_SELECTOR ());
+weak_alias (__memrchr, memrchr)
+#endif
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-11-21 09:56:04 +0000