diff --git a/libc/Android.bp b/libc/Android.bp
index a8beb05..3c5c9f1 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -623,7 +623,6 @@
         arm: {
             srcs: [
                 "upstream-openbsd/lib/libc/string/memchr.c",
-                "upstream-openbsd/lib/libc/string/memrchr.c",
                 "upstream-openbsd/lib/libc/string/stpncpy.c",
                 "upstream-openbsd/lib/libc/string/strncat.c",
                 "upstream-openbsd/lib/libc/string/strncmp.c",
@@ -640,7 +639,6 @@
         },
         riscv64: {
             srcs: [
-                "upstream-openbsd/lib/libc/string/memrchr.c",
                 "upstream-openbsd/lib/libc/string/stpncpy.c",
             ],
         },
@@ -1161,7 +1159,6 @@
 
                 "arch-x86/string/sse2-memchr-atom.S",
                 "arch-x86/string/sse2-memmove-slm.S",
-                "arch-x86/string/sse2-memrchr-atom.S",
                 "arch-x86/string/sse2-memset-slm.S",
                 "arch-x86/string/sse2-stpcpy-slm.S",
                 "arch-x86/string/sse2-stpncpy-slm.S",
diff --git a/libc/NOTICE b/libc/NOTICE
index 1fa036a..bca4891 100644
--- a/libc/NOTICE
+++ b/libc/NOTICE
@@ -3585,22 +3585,6 @@
 
 -------------------------------------------------------------------
 
-Copyright (c) 2007 Todd C. Miller <millert@openbsd.org>
-
-Permission to use, copy, modify, and distribute this software for any
-purpose with or without fee is hereby granted, provided that the above
-copyright notice and this permission notice appear in all copies.
-
-THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-
--------------------------------------------------------------------
-
 Copyright (c) 2007-2008  Michael G Schwern
 
 This software originally derived from Paul Sheer's pivotal_gmtime_r.c.
diff --git a/libc/arch-x86/string/sse2-memrchr-atom.S b/libc/arch-x86/string/sse2-memrchr-atom.S
deleted file mode 100644
index 1aa1a1a..0000000
--- a/libc/arch-x86/string/sse2-memrchr-atom.S
+++ /dev/null
@@ -1,778 +0,0 @@
-/*
-Copyright (c) 2011, Intel Corporation
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
-    * Redistributions of source code must retain the above copyright notice,
-    * this list of conditions and the following disclaimer.
-
-    * Redistributions in binary form must reproduce the above copyright notice,
-    * this list of conditions and the following disclaimer in the documentation
-    * and/or other materials provided with the distribution.
-
-    * Neither the name of Intel Corporation nor the names of its contributors
-    * may be used to endorse or promote products derived from this software
-    * without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
-ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
-ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
-ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*/
-
-#ifndef L
-# define L(label)	.L##label
-#endif
-
-#ifndef cfi_startproc
-# define cfi_startproc	.cfi_startproc
-#endif
-
-#ifndef cfi_endproc
-# define cfi_endproc	.cfi_endproc
-#endif
-
-#ifndef cfi_rel_offset
-# define cfi_rel_offset(reg, off)	.cfi_rel_offset reg, off
-#endif
-
-#ifndef cfi_restore
-# define cfi_restore(reg)	.cfi_restore reg
-#endif
-
-#ifndef cfi_adjust_cfa_offset
-# define cfi_adjust_cfa_offset(off)	.cfi_adjust_cfa_offset off
-#endif
-
-#ifndef ENTRY
-# define ENTRY(name)	\
-	.type name,  @function;	\
-	.globl name;	\
-	.p2align 4;	\
-name:	\
-	cfi_startproc
-#endif
-
-#ifndef END
-# define END(name)	\
-	cfi_endproc;	\
-	.size name,	.-name
-#endif
-
-#define CFI_PUSH(REG)	\
-	cfi_adjust_cfa_offset (4);	\
-	cfi_rel_offset (REG, 0)
-
-#define CFI_POP(REG)	\
-	cfi_adjust_cfa_offset (-4);	\
-	cfi_restore (REG)
-
-#define PUSH(REG) pushl REG; CFI_PUSH (REG)
-#define POP(REG) popl REG; CFI_POP (REG)
-
-#define PARMS  4
-#define STR1  PARMS
-#define STR2  STR1+4
-#define LEN   STR2+4
-
-	.text
-ENTRY (memrchr)
-	mov	STR1(%esp), %ecx
-	movd	STR2(%esp), %xmm1
-	mov	LEN(%esp), %edx
-
-	test	%edx, %edx
-	jz	L(return_null)
-	sub	$16, %edx
-	jbe	L(length_less16)
-
-	punpcklbw %xmm1, %xmm1
-	add	%edx, %ecx
-	punpcklbw %xmm1, %xmm1
-
-	movdqu	(%ecx), %xmm0
-	pshufd	$0, %xmm1, %xmm1
-	pcmpeqb	%xmm1, %xmm0
-
-	pmovmskb %xmm0, %eax
-	test	%eax, %eax
-	jnz	L(exit_dispatch)
-
-	sub	$64, %ecx
-	mov	%ecx, %eax
-	and	$15, %eax
-	jz	L(loop_prolog)
-
-	add	$16, %ecx
-	add	$16, %edx
-	and	$-16, %ecx
-	sub	%eax, %edx
-
-	.p2align 4
-/* Loop start on aligned string.  */
-L(loop_prolog):
-	sub	$64, %edx
-	jbe	L(exit_loop)
-
-	movdqa	48(%ecx), %xmm0
-	pcmpeqb	%xmm1, %xmm0
-	pmovmskb %xmm0, %eax
-	test	%eax, %eax
-	jnz	L(matches48)
-
-	movdqa	32(%ecx), %xmm2
-	pcmpeqb	%xmm1, %xmm2
-	pmovmskb %xmm2, %eax
-	test	%eax, %eax
-	jnz	L(matches32)
-
-	movdqa	16(%ecx), %xmm3
-	pcmpeqb	%xmm1, %xmm3
-	pmovmskb %xmm3, %eax
-	test	%eax, %eax
-	jnz	L(matches16)
-
-	movdqa	(%ecx), %xmm4
-	pcmpeqb	%xmm1, %xmm4
-	pmovmskb %xmm4, %eax
-	test	%eax, %eax
-	jnz	L(exit_dispatch)
-
-	sub	$64, %ecx
-	sub	$64, %edx
-	jbe	L(exit_loop)
-
-	movdqa	48(%ecx), %xmm0
-	pcmpeqb	%xmm1, %xmm0
-	pmovmskb %xmm0, %eax
-	test	%eax, %eax
-	jnz	L(matches48)
-
-	movdqa	32(%ecx), %xmm2
-	pcmpeqb	%xmm1, %xmm2
-	pmovmskb %xmm2, %eax
-	test	%eax, %eax
-	jnz	L(matches32)
-
-	movdqa	16(%ecx), %xmm3
-	pcmpeqb	%xmm1, %xmm3
-	pmovmskb %xmm3, %eax
-	test	%eax, %eax
-	jnz	L(matches16)
-
-	movdqa	(%ecx), %xmm3
-	pcmpeqb	%xmm1, %xmm3
-	pmovmskb %xmm3, %eax
-	test	%eax, %eax
-	jnz	L(exit_dispatch)
-
-	mov	%ecx, %eax
-	and	$63, %eax
-	test	%eax, %eax
-	jz	L(align64_loop)
-
-	add	$64, %ecx
-	add	$64, %edx
-	and	$-64, %ecx
-	sub	%eax, %edx
-
-	.p2align 4
-L(align64_loop):
-	sub	$64, %ecx
-	sub	$64, %edx
-	jbe	L(exit_loop)
-
-	movdqa	(%ecx), %xmm0
-	movdqa	16(%ecx), %xmm2
-	movdqa	32(%ecx), %xmm3
-	movdqa	48(%ecx), %xmm4
-
-	pcmpeqb	%xmm1, %xmm0
-	pcmpeqb	%xmm1, %xmm2
-	pcmpeqb	%xmm1, %xmm3
-	pcmpeqb	%xmm1, %xmm4
-
-	pmaxub	%xmm3, %xmm0
-	pmaxub	%xmm4, %xmm2
-	pmaxub	%xmm0, %xmm2
-	pmovmskb %xmm2, %eax
-
-	test	%eax, %eax
-	jz	L(align64_loop)
-
-	pmovmskb %xmm4, %eax
-	test	%eax, %eax
-	jnz	L(matches48)
-
-	pmovmskb %xmm3, %eax
-	test	%eax, %eax
-	jnz	L(matches32)
-
-	movdqa	16(%ecx), %xmm2
-
-	pcmpeqb	%xmm1, %xmm2
-	pcmpeqb	(%ecx), %xmm1
-
-	pmovmskb %xmm2, %eax
-	test	%eax, %eax
-	jnz	L(matches16)
-
-	pmovmskb %xmm1, %eax
-	test	%ah, %ah
-	jnz	L(exit_dispatch_high)
-	mov	%al, %dl
-	and	$15 << 4, %dl
-	jnz	L(exit_dispatch_8)
-	test	$0x08, %al
-	jnz	L(exit_4)
-	test	$0x04, %al
-	jnz	L(exit_3)
-	test	$0x02, %al
-	jnz	L(exit_2)
-	mov	%ecx, %eax
-	ret
-
-	.p2align 4
-L(exit_loop):
-	add	$64, %edx
-	cmp	$32, %edx
-	jbe	L(exit_loop_32)
-
-	movdqa	48(%ecx), %xmm0
-	pcmpeqb	%xmm1, %xmm0
-	pmovmskb %xmm0, %eax
-	test	%eax, %eax
-	jnz	L(matches48)
-
-	movdqa	32(%ecx), %xmm2
-	pcmpeqb	%xmm1, %xmm2
-	pmovmskb %xmm2, %eax
-	test	%eax, %eax
-	jnz	L(matches32)
-
-	movdqa	16(%ecx), %xmm3
-	pcmpeqb	%xmm1, %xmm3
-	pmovmskb %xmm3, %eax
-	test	%eax, %eax
-	jnz	L(matches16_1)
-	cmp	$48, %edx
-	jbe	L(return_null)
-
-	pcmpeqb	(%ecx), %xmm1
-	pmovmskb %xmm1, %eax
-	test	%eax, %eax
-	jnz	L(matches0_1)
-	xor	%eax, %eax
-	ret
-
-	.p2align 4
-L(exit_loop_32):
-	movdqa	48(%ecx), %xmm0
-	pcmpeqb	%xmm1, %xmm0
-	pmovmskb %xmm0, %eax
-	test	%eax, %eax
-	jnz	L(matches48_1)
-	cmp	$16, %edx
-	jbe	L(return_null)
-
-	pcmpeqb	32(%ecx), %xmm1
-	pmovmskb %xmm1, %eax
-	test	%eax, %eax
-	jnz	L(matches32_1)
-	xor	%eax, %eax
-	ret
-
-	.p2align 4
-L(matches16):
-	lea	16(%ecx), %ecx
-	test	%ah, %ah
-	jnz	L(exit_dispatch_high)
-	mov	%al, %dl
-	and	$15 << 4, %dl
-	jnz	L(exit_dispatch_8)
-	test	$0x08, %al
-	jnz	L(exit_4)
-	test	$0x04, %al
-	jnz	L(exit_3)
-	test	$0x02, %al
-	jnz	L(exit_2)
-	mov	%ecx, %eax
-	ret
-
-	.p2align 4
-L(matches32):
-	lea	32(%ecx), %ecx
-	test	%ah, %ah
-	jnz	L(exit_dispatch_high)
-	mov	%al, %dl
-	and	$15 << 4, %dl
-	jnz	L(exit_dispatch_8)
-	test	$0x08, %al
-	jnz	L(exit_4)
-	test	$0x04, %al
-	jnz	L(exit_3)
-	test	$0x02, %al
-	jnz	L(exit_2)
-	mov	%ecx, %eax
-	ret
-
-	.p2align 4
-L(matches48):
-	lea	48(%ecx), %ecx
-
-	.p2align 4
-L(exit_dispatch):
-	test	%ah, %ah
-	jnz	L(exit_dispatch_high)
-	mov	%al, %dl
-	and	$15 << 4, %dl
-	jnz	L(exit_dispatch_8)
-	test	$0x08, %al
-	jnz	L(exit_4)
-	test	$0x04, %al
-	jnz	L(exit_3)
-	test	$0x02, %al
-	jnz	L(exit_2)
-	mov	%ecx, %eax
-	ret
-
-	.p2align 4
-L(exit_dispatch_8):
-	test	$0x80, %al
-	jnz	L(exit_8)
-	test	$0x40, %al
-	jnz	L(exit_7)
-	test	$0x20, %al
-	jnz	L(exit_6)
-	lea	4(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_dispatch_high):
-	mov	%ah, %dh
-	and	$15 << 4, %dh
-	jnz	L(exit_dispatch_high_8)
-	test	$0x08, %ah
-	jnz	L(exit_12)
-	test	$0x04, %ah
-	jnz	L(exit_11)
-	test	$0x02, %ah
-	jnz	L(exit_10)
-	lea	8(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_dispatch_high_8):
-	test	$0x80, %ah
-	jnz	L(exit_16)
-	test	$0x40, %ah
-	jnz	L(exit_15)
-	test	$0x20, %ah
-	jnz	L(exit_14)
-	lea	12(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_2):
-	lea	1(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_3):
-	lea	2(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_4):
-	lea	3(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_6):
-	lea	5(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_7):
-	lea	6(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_8):
-	lea	7(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_10):
-	lea	9(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_11):
-	lea	10(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_12):
-	lea	11(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_14):
-	lea	13(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_15):
-	lea	14(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_16):
-	lea	15(%ecx), %eax
-	ret
-
-	.p2align 4
-L(matches0_1):
-	lea	-64(%edx), %edx
-
-	test	%ah, %ah
-	jnz	L(exit_dispatch_1_high)
-	mov	%al, %ah
-	and	$15 << 4, %ah
-	jnz	L(exit_dispatch_1_8)
-	test	$0x08, %al
-	jnz	L(exit_1_4)
-	test	$0x04, %al
-	jnz	L(exit_1_3)
-	test	$0x02, %al
-	jnz	L(exit_1_2)
-
-	add	$0, %edx
-	jl	L(return_null)
-	mov	%ecx, %eax
-	ret
-
-	.p2align 4
-L(matches16_1):
-	lea	-48(%edx), %edx
-	lea	16(%ecx), %ecx
-
-	test	%ah, %ah
-	jnz	L(exit_dispatch_1_high)
-	mov	%al, %ah
-	and	$15 << 4, %ah
-	jnz	L(exit_dispatch_1_8)
-	test	$0x08, %al
-	jnz	L(exit_1_4)
-	test	$0x04, %al
-	jnz	L(exit_1_3)
-	test	$0x02, %al
-	jnz	L(exit_1_2)
-
-	add	$0, %edx
-	jl	L(return_null)
-	mov	%ecx, %eax
-	ret
-
-	.p2align 4
-L(matches32_1):
-	lea	-32(%edx), %edx
-	lea	32(%ecx), %ecx
-
-	test	%ah, %ah
-	jnz	L(exit_dispatch_1_high)
-	mov	%al, %ah
-	and	$15 << 4, %ah
-	jnz	L(exit_dispatch_1_8)
-	test	$0x08, %al
-	jnz	L(exit_1_4)
-	test	$0x04, %al
-	jnz	L(exit_1_3)
-	test	$0x02, %al
-	jnz	L(exit_1_2)
-
-	add	$0, %edx
-	jl	L(return_null)
-	mov	%ecx, %eax
-	ret
-
-	.p2align 4
-L(matches48_1):
-	lea	-16(%edx), %edx
-	lea	48(%ecx), %ecx
-
-	.p2align 4
-L(exit_dispatch_1):
-	test	%ah, %ah
-	jnz	L(exit_dispatch_1_high)
-	mov	%al, %ah
-	and	$15 << 4, %ah
-	jnz	L(exit_dispatch_1_8)
-	test	$0x08, %al
-	jnz	L(exit_1_4)
-	test	$0x04, %al
-	jnz	L(exit_1_3)
-	test	$0x02, %al
-	jnz	L(exit_1_2)
-
-	add	$0, %edx
-	jl	L(return_null)
-	mov	%ecx, %eax
-	ret
-
-	.p2align 4
-L(exit_dispatch_1_8):
-	test	$0x80, %al
-	jnz	L(exit_1_8)
-	test	$0x40, %al
-	jnz	L(exit_1_7)
-	test	$0x20, %al
-	jnz	L(exit_1_6)
-
-	add	$4, %edx
-	jl	L(return_null)
-	lea	4(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_dispatch_1_high):
-	mov	%ah, %al
-	and	$15 << 4, %al
-	jnz	L(exit_dispatch_1_high_8)
-	test	$0x08, %ah
-	jnz	L(exit_1_12)
-	test	$0x04, %ah
-	jnz	L(exit_1_11)
-	test	$0x02, %ah
-	jnz	L(exit_1_10)
-
-	add	$8, %edx
-	jl	L(return_null)
-	lea	8(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_dispatch_1_high_8):
-	test	$0x80, %ah
-	jnz	L(exit_1_16)
-	test	$0x40, %ah
-	jnz	L(exit_1_15)
-	test	$0x20, %ah
-	jnz	L(exit_1_14)
-
-	add	$12, %edx
-	jl	L(return_null)
-	lea	12(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_1_2):
-	add	$1, %edx
-	jl	L(return_null)
-	lea	1(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_1_3):
-	add	$2, %edx
-	jl	L(return_null)
-	lea	2(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_1_4):
-	add	$3, %edx
-	jl	L(return_null)
-	lea	3(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_1_6):
-	add	$5, %edx
-	jl	L(return_null)
-	lea	5(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_1_7):
-	add	$6, %edx
-	jl	L(return_null)
-	lea	6(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_1_8):
-	add	$7, %edx
-	jl	L(return_null)
-	lea	7(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_1_10):
-	add	$9, %edx
-	jl	L(return_null)
-	lea	9(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_1_11):
-	add	$10, %edx
-	jl	L(return_null)
-	lea	10(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_1_12):
-	add	$11, %edx
-	jl	L(return_null)
-	lea	11(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_1_14):
-	add	$13, %edx
-	jl	L(return_null)
-	lea	13(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_1_15):
-	add	$14, %edx
-	jl	L(return_null)
-	lea	14(%ecx), %eax
-	ret
-
-	.p2align 4
-L(exit_1_16):
-	add	$15, %edx
-	jl	L(return_null)
-	lea	15(%ecx), %eax
-	ret
-
-	.p2align 4
-L(return_null):
-	xor	%eax, %eax
-	ret
-
-	.p2align 4
-L(length_less16_offset0):
-	mov	%dl, %cl
-	pcmpeqb	(%eax), %xmm1
-
-	mov	$1, %edx
-	sal	%cl, %edx
-	sub	$1, %edx
-
-	mov	%eax, %ecx
-	pmovmskb %xmm1, %eax
-
-	and	%edx, %eax
-	test	%eax, %eax
-	jnz	L(exit_dispatch)
-
-	xor	%eax, %eax
-	ret
-
-	.p2align 4
-L(length_less16):
-	punpcklbw %xmm1, %xmm1
-	add	$16, %edx
-	punpcklbw %xmm1, %xmm1
-
-	mov	%ecx, %eax
-	pshufd	$0, %xmm1, %xmm1
-
-	and	$15, %ecx
-	jz	L(length_less16_offset0)
-
-	PUSH	(%edi)
-
-	mov	%cl, %dh
-	add	%dl, %dh
-	and	$-16, %eax
-
-	sub	$16, %dh
-	ja	L(length_less16_part2)
-
-	pcmpeqb	(%eax), %xmm1
-	pmovmskb %xmm1, %edi
-
-	sar	%cl, %edi
-	add	%ecx, %eax
-	mov	%dl, %cl
-
-	mov	$1, %edx
-	sal	%cl, %edx
-	sub	$1, %edx
-
-	and	%edx, %edi
-	test	%edi, %edi
-	jz	L(ret_null)
-
-	bsr	%edi, %edi
-	add	%edi, %eax
-	POP	(%edi)
-	ret
-
-	CFI_PUSH     (%edi)
-
-	.p2align 4
-L(length_less16_part2):
-	movdqa	16(%eax), %xmm2
-	pcmpeqb	%xmm1, %xmm2
-	pmovmskb %xmm2, %edi
-
-	mov	%cl, %ch
-
-	mov	%dh, %cl
-	mov	$1, %edx
-	sal	%cl, %edx
-	sub	$1, %edx
-
-	and	%edx, %edi
-
-	test	%edi, %edi
-	jnz	L(length_less16_part2_return)
-
-	pcmpeqb	(%eax), %xmm1
-	pmovmskb %xmm1, %edi
-
-	mov	%ch, %cl
-	sar	%cl, %edi
-	test	%edi, %edi
-	jz	L(ret_null)
-
-	bsr	%edi, %edi
-	add	%edi, %eax
-	xor	%ch, %ch
-	add	%ecx, %eax
-	POP	(%edi)
-	ret
-
-	CFI_PUSH     (%edi)
-
-	.p2align 4
-L(length_less16_part2_return):
-	bsr	%edi, %edi
-	lea	16(%eax, %edi), %eax
-	POP	(%edi)
-	ret
-
-	CFI_PUSH     (%edi)
-
-	.p2align 4
-L(ret_null):
-	xor	%eax, %eax
-	POP	(%edi)
-	ret
-
-END (memrchr)
diff --git a/libc/upstream-openbsd/lib/libc/string/memrchr.c b/libc/upstream-openbsd/lib/libc/string/memrchr.c
deleted file mode 100644
index e123bc1..0000000
--- a/libc/upstream-openbsd/lib/libc/string/memrchr.c
+++ /dev/null
@@ -1,39 +0,0 @@
-/*	$OpenBSD: memrchr.c,v 1.4 2019/01/25 00:19:25 millert Exp $	*/
-
-/*
- * Copyright (c) 2007 Todd C. Miller <millert@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-
-#include <string.h>
-
-/*
- * Reverse memchr()
- * Find the last occurrence of 'c' in the buffer 's' of size 'n'.
- */
-void *
-memrchr(const void *s, int c, size_t n)
-{
-	const unsigned char *cp;
-
-	if (n != 0) {
-		cp = (unsigned char *)s + n;
-		do {
-			if (*(--cp) == (unsigned char)c)
-				return((void *)cp);
-		} while (--n != 0);
-	}
-	return(NULL);
-}
-DEF_WEAK(memrchr);