[MIPS] Add optimized string functions

Use same string functions for all MIPS architectures.

Bug: 21555893
(cherry picked from commit 38f2eaa07b0ad2e01a40607d3a0ac240ff53abbf)

Change-Id: I94521f023d0bb136a4672782148a9f6e77cc6f1e

5 files changed, 5 insertions, 1042 deletions

diff --git a/libc/arch-mips64/mips64.mk b/libc/arch-mips64/mips64.mk
index 2b81e63..7757385 100644
--- a/libc/arch-mips64/mips64.mk
+++ b/libc/arch-mips64/mips64.mk
@@ -5,6 +5,11 @@
 #
 
 libc_bionic_src_files_mips64 += \
+    arch-mips/string/memcmp.c \
+    arch-mips/string/memcpy.S \
+    arch-mips/string/memset.S \
+    arch-mips/string/strcmp.S \
+    arch-mips/string/strlen.c \
     bionic/__memcpy_chk.cpp \
     bionic/__memset_chk.cpp \
     bionic/__strcpy_chk.cpp \
@@ -12,10 +17,6 @@ libc_bionic_src_files_mips64 += \
     bionic/strchr.cpp \
     bionic/strnlen.c \
     bionic/strrchr.cpp \
-    arch-mips/string/memcmp.c \
-    arch-mips/string/memcpy.c \
-    arch-mips/string/memset.c \
-    arch-mips/string/strlen.c \
 
 libc_freebsd_src_files_mips64 += \
     upstream-freebsd/lib/libc/string/wcscat.c \
@@ -34,7 +35,6 @@ libc_openbsd_src_files_mips64 += \
     upstream-openbsd/lib/libc/string/stpcpy.c \
     upstream-openbsd/lib/libc/string/stpncpy.c \
     upstream-openbsd/lib/libc/string/strcat.c \
-    upstream-openbsd/lib/libc/string/strcmp.c \
     upstream-openbsd/lib/libc/string/strcpy.c \
     upstream-openbsd/lib/libc/string/strlcat.c \
     upstream-openbsd/lib/libc/string/strlcpy.c \
diff --git a/libc/arch-mips64/string/memcpy.S b/libc/arch-mips64/string/memcpy.S
deleted file mode 100644
index dc91096..0000000
--- a/libc/arch-mips64/string/memcpy.S
+++ /dev/null
@@ -1,423 +0,0 @@
-/*
- * Copyright (c) 2009
- *      MIPS Technologies, Inc., California.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. 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.
- * 3. Neither the name of the MIPS Technologies, Inc., 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 MIPS TECHNOLOGIES, INC. ``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 MIPS TECHNOLOGIES, INC. 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.
- */
-
-/************************************************************************
- *
- *  memcpy.S
- *  Version: "043009"
- *
- ************************************************************************/
-
-
-/************************************************************************
- *  Include files
- ************************************************************************/
-
-#include <private/bionic_asm.h>
-
-
-/*
- * This routine could be optimized for MIPS64. The current code only
- * uses MIPS32 instructions.
- */
-#if defined(__MIPSEB__)
-#  define LWHI	lwl		/* high part is left in big-endian	*/
-#  define SWHI	swl		/* high part is left in big-endian	*/
-#  define LWLO	lwr		/* low part is right in big-endian	*/
-#  define SWLO	swr		/* low part is right in big-endian	*/
-#endif
-
-#if defined(__MIPSEL__)
-#  define LWHI	lwr		/* high part is right in little-endian	*/
-#  define SWHI	swr		/* high part is right in little-endian	*/
-#  define LWLO	lwl		/* low part is left in big-endian	*/
-#  define SWLO	swl		/* low part is left in big-endian	*/
-#endif
-
-LEAF(memcpy,0)
-
-	.set	noreorder
-	.set	noat
-/*
- * Below we handle the case where memcpy is called with overlapping src and dst.
- * Although memcpy is not required to handle this case, some parts of Android like Skia
- * rely on such usage. We call memmove to handle such cases.
- */
-	subu	t0,a0,a1
-	sra	AT,t0,31
-	xor	t1,t0,AT
-	subu	t0,t1,AT
-	sltu	AT,t0,a2
-	beq	AT,zero,.Lmemcpy
-	 la	t9,memmove
-	jr	t9
-	 nop
-.Lmemcpy:
-	slti	AT,a2,8
-	bne	AT,zero,.Llast8
-	 move	v0,a0	# memcpy returns the dst pointer
-
-# Test if the src and dst are word-aligned, or can be made word-aligned
-	xor	t8,a1,a0
-	andi	t8,t8,0x3		# t8 is a0/a1 word-displacement
-
-	bne	t8,zero,.Lunaligned
-	 negu	a3,a0
-
-	andi	a3,a3,0x3	# we need to copy a3 bytes to make a0/a1 aligned
-	beq	a3,zero,.Lchk16w # when a3=0 then the dst (a0) is word-aligned
-	 subu	a2,a2,a3	# now a2 is the remining bytes count
-
-	LWHI	t8,0(a1)
-	addu	a1,a1,a3
-	SWHI	t8,0(a0)
-	addu	a0,a0,a3
-
-# Now the dst/src are mutually word-aligned with word-aligned addresses
-.Lchk16w:
-	andi	t8,a2,0x3f	# any whole 64-byte chunks?
-				# t8 is the byte count after 64-byte chunks
-
-	beq	a2,t8,.Lchk8w	# if a2==t8, no 64-byte chunks
-				# There will be at most 1 32-byte chunk after it
-	 subu	a3,a2,t8	# subtract from a2 the reminder
-                                # Here a3 counts bytes in 16w chunks
-	addu	a3,a0,a3	# Now a3 is the final dst after 64-byte chunks
-
-	addu	t0,a0,a2	# t0 is the "past the end" address
-
-# When in the loop we exercise "pref 30,x(a0)", the a0+x should not be past
-# the "t0-32" address
-# This means: for x=128 the last "safe" a0 address is "t0-160"
-# Alternatively, for x=64 the last "safe" a0 address is "t0-96"
-# In the current version we will use "pref 30,128(a0)", so "t0-160" is the limit
-	subu	t9,t0,160	# t9 is the "last safe pref 30,128(a0)" address
-
-	pref    0,0(a1)		# bring the first line of src, addr 0
-	pref    0,32(a1)	# bring the second line of src, addr 32
-	pref    0,64(a1)	# bring the third line of src, addr 64
-	pref	30,32(a0)	# safe, as we have at least 64 bytes ahead
-# In case the a0 > t9 don't use "pref 30" at all
-	sgtu	v1,a0,t9
-	bgtz	v1,.Lloop16w	# skip "pref 30,64(a0)" for too short arrays
-	 nop
-# otherwise, start with using pref30
-	pref	30,64(a0)
-.Lloop16w:
-	pref	0,96(a1)
-	lw	t0,0(a1)
-	bgtz	v1,.Lskip_pref30_96	# skip "pref 30,96(a0)"
-	 lw	t1,4(a1)
-	pref    30,96(a0)   # continue setting up the dest, addr 96
-.Lskip_pref30_96:
-	lw	t2,8(a1)
-	lw	t3,12(a1)
-	lw	t4,16(a1)
-	lw	t5,20(a1)
-	lw	t6,24(a1)
-	lw	t7,28(a1)
-        pref    0,128(a1)    # bring the next lines of src, addr 128
-
-	sw	t0,0(a0)
-	sw	t1,4(a0)
-	sw	t2,8(a0)
-	sw	t3,12(a0)
-	sw	t4,16(a0)
-	sw	t5,20(a0)
-	sw	t6,24(a0)
-	sw	t7,28(a0)
-
-	lw	t0,32(a1)
-	bgtz	v1,.Lskip_pref30_128	# skip "pref 30,128(a0)"
-	 lw	t1,36(a1)
-	pref    30,128(a0)   # continue setting up the dest, addr 128
-.Lskip_pref30_128:
-	lw	t2,40(a1)
-	lw	t3,44(a1)
-	lw	t4,48(a1)
-	lw	t5,52(a1)
-	lw	t6,56(a1)
-	lw	t7,60(a1)
-        pref    0, 160(a1)    # bring the next lines of src, addr 160
-
-	sw	t0,32(a0)
-	sw	t1,36(a0)
-	sw	t2,40(a0)
-	sw	t3,44(a0)
-	sw	t4,48(a0)
-	sw	t5,52(a0)
-	sw	t6,56(a0)
-	sw	t7,60(a0)
-
-	addiu	a0,a0,64	# adding 64 to dest
-	sgtu	v1,a0,t9
-	bne	a0,a3,.Lloop16w
-	 addiu	a1,a1,64	# adding 64 to src
-	move	a2,t8
-
-# Here we have src and dest word-aligned but less than 64-bytes to go
-
-.Lchk8w:
-	pref 0, 0x0(a1)
-	andi	t8,a2,0x1f	# is there a 32-byte chunk?
-				# the t8 is the reminder count past 32-bytes
-	beq	a2,t8,.Lchk1w	# when a2=t8, no 32-byte chunk
-	 nop
-
-	lw	t0,0(a1)
-	lw	t1,4(a1)
-	lw	t2,8(a1)
-	lw	t3,12(a1)
-	lw	t4,16(a1)
-	lw	t5,20(a1)
-	lw	t6,24(a1)
-	lw	t7,28(a1)
-	addiu	a1,a1,32
-
-	sw	t0,0(a0)
-	sw	t1,4(a0)
-	sw	t2,8(a0)
-	sw	t3,12(a0)
-	sw	t4,16(a0)
-	sw	t5,20(a0)
-	sw	t6,24(a0)
-	sw	t7,28(a0)
-	addiu	a0,a0,32
-
-.Lchk1w:
-	andi	a2,t8,0x3	# now a2 is the reminder past 1w chunks
-	beq	a2,t8,.Llast8
-	 subu	a3,t8,a2	# a3 is count of bytes in 1w chunks
-	addu	a3,a0,a3	# now a3 is the dst address past the 1w chunks
-
-# copying in words (4-byte chunks)
-.LwordCopy_loop:
-	lw	t3,0(a1)	# the first t3 may be equal t0 ... optimize?
-	addiu	a1,a1,4
-	addiu	a0,a0,4
-	bne	a0,a3,.LwordCopy_loop
-	 sw	t3,-4(a0)
-
-# For the last (<8) bytes
-.Llast8:
-	blez	a2,.Lleave
-	 addu	a3,a0,a2	# a3 is the last dst address
-.Llast8loop:
-	lb	v1,0(a1)
-	addiu	a1,a1,1
-	addiu	a0,a0,1
-	bne	a0,a3,.Llast8loop
-	 sb	v1,-1(a0)
-
-.Lleave:
-	j	ra
-	 nop
-
-#
-# UNALIGNED case
-#
-
-.Lunaligned:
-	# got here with a3="negu a0"
-	andi	a3,a3,0x3	# test if the a0 is word aligned
-	beqz	a3,.Lua_chk16w
-	 subu	a2,a2,a3	# bytes left after initial a3 bytes
-
-	LWHI	v1,0(a1)
-	LWLO	v1,3(a1)
-	addu	a1,a1,a3	# a3 may be here 1, 2 or 3
-	SWHI	v1,0(a0)
-	addu	a0,a0,a3	# below the dst will be word aligned (NOTE1)
-
-.Lua_chk16w:
-	andi	t8,a2,0x3f	# any whole 64-byte chunks?
-				# t8 is the byte count after 64-byte chunks
-	beq	a2,t8,.Lua_chk8w # if a2==t8, no 64-byte chunks
-				# There will be at most 1 32-byte chunk after it
-	 subu	a3,a2,t8	# subtract from a2 the reminder
-                                # Here a3 counts bytes in 16w chunks
-	addu	a3,a0,a3	# Now a3 is the final dst after 64-byte chunks
-
-	addu	t0,a0,a2	# t0 is the "past the end" address
-
-	subu	t9,t0,160	# t9 is the "last safe pref 30,128(a0)" address
-
-	pref    0,0(a1)		# bring the first line of src, addr 0
-	pref    0,32(a1)	# bring the second line of src, addr 32
-	pref    0,64(a1)	# bring the third line of src, addr 64
-	pref	30,32(a0)	# safe, as we have at least 64 bytes ahead
-# In case the a0 > t9 don't use "pref 30" at all
-	sgtu	v1,a0,t9
-	bgtz	v1,.Lua_loop16w	# skip "pref 30,64(a0)" for too short arrays
-	 nop
-# otherwise, start with using pref30
-	pref	30,64(a0)
-.Lua_loop16w:
-	pref	0,96(a1)
-	LWHI	t0,0(a1)
-	LWLO	t0,3(a1)
-	LWHI	t1,4(a1)
-	bgtz	v1,.Lua_skip_pref30_96
-	 LWLO	t1,7(a1)
-	pref    30,96(a0)   # continue setting up the dest, addr 96
-.Lua_skip_pref30_96:
-	LWHI	t2,8(a1)
-	LWLO	t2,11(a1)
-	LWHI	t3,12(a1)
-	LWLO	t3,15(a1)
-	LWHI	t4,16(a1)
-	LWLO	t4,19(a1)
-	LWHI	t5,20(a1)
-	LWLO	t5,23(a1)
-	LWHI	t6,24(a1)
-	LWLO	t6,27(a1)
-	LWHI	t7,28(a1)
-	LWLO	t7,31(a1)
-        pref    0,128(a1)    # bring the next lines of src, addr 128
-
-	sw	t0,0(a0)
-	sw	t1,4(a0)
-	sw	t2,8(a0)
-	sw	t3,12(a0)
-	sw	t4,16(a0)
-	sw	t5,20(a0)
-	sw	t6,24(a0)
-	sw	t7,28(a0)
-
-	LWHI	t0,32(a1)
-	LWLO	t0,35(a1)
-	LWHI	t1,36(a1)
-	bgtz	v1,.Lua_skip_pref30_128
-	LWLO	t1,39(a1)
-	pref    30,128(a0)   # continue setting up the dest, addr 128
-.Lua_skip_pref30_128:
-	LWHI	t2,40(a1)
-	LWLO	t2,43(a1)
-	LWHI	t3,44(a1)
-	LWLO	t3,47(a1)
-	LWHI	t4,48(a1)
-	LWLO	t4,51(a1)
-	LWHI	t5,52(a1)
-	LWLO	t5,55(a1)
-	LWHI	t6,56(a1)
-	LWLO	t6,59(a1)
-	LWHI	t7,60(a1)
-	LWLO	t7,63(a1)
-        pref    0, 160(a1)    # bring the next lines of src, addr 160
-
-	sw	t0,32(a0)
-	sw	t1,36(a0)
-	sw	t2,40(a0)
-	sw	t3,44(a0)
-	sw	t4,48(a0)
-	sw	t5,52(a0)
-	sw	t6,56(a0)
-	sw	t7,60(a0)
-
-	addiu	a0,a0,64	# adding 64 to dest
-	sgtu	v1,a0,t9
-	bne	a0,a3,.Lua_loop16w
-	 addiu	a1,a1,64	# adding 64 to src
-	move	a2,t8
-
-# Here we have src and dest word-aligned but less than 64-bytes to go
-
-.Lua_chk8w:
-	pref 0, 0x0(a1)
-	andi	t8,a2,0x1f	# is there a 32-byte chunk?
-				# the t8 is the reminder count
-	beq	a2,t8,.Lua_chk1w # when a2=t8, no 32-byte chunk
-	 nop
-
-	LWHI	t0,0(a1)
-	LWLO	t0,3(a1)
-	LWHI	t1,4(a1)
-	LWLO	t1,7(a1)
-	LWHI	t2,8(a1)
-	LWLO	t2,11(a1)
-	LWHI	t3,12(a1)
-	LWLO	t3,15(a1)
-	LWHI	t4,16(a1)
-	LWLO	t4,19(a1)
-	LWHI	t5,20(a1)
-	LWLO	t5,23(a1)
-	LWHI	t6,24(a1)
-	LWLO	t6,27(a1)
-	LWHI	t7,28(a1)
-	LWLO	t7,31(a1)
-	addiu	a1,a1,32
-
-	sw	t0,0(a0)
-	sw	t1,4(a0)
-	sw	t2,8(a0)
-	sw	t3,12(a0)
-	sw	t4,16(a0)
-	sw	t5,20(a0)
-	sw	t6,24(a0)
-	sw	t7,28(a0)
-	addiu	a0,a0,32
-
-.Lua_chk1w:
-	andi	a2,t8,0x3	# now a2 is the reminder past 1w chunks
-	beq	a2,t8,.Lua_smallCopy
-	 subu	a3,t8,a2	# a3 is count of bytes in 1w chunks
-	addu	a3,a0,a3	# now a3 is the dst address past the 1w chunks
-
-# copying in words (4-byte chunks)
-.Lua_wordCopy_loop:
-	LWHI	v1,0(a1)
-	LWLO	v1,3(a1)
-	addiu	a1,a1,4
-	addiu	a0,a0,4		# note: dst=a0 is word aligned here, see NOTE1
-	bne	a0,a3,.Lua_wordCopy_loop
-	 sw	v1,-4(a0)
-
-# Now less than 4 bytes (value in a2) left to copy
-.Lua_smallCopy:
-	beqz	a2,.Lleave
-	addu	a3,a0,a2	# a3 is the last dst address
-.Lua_smallCopy_loop:
-	lb	v1,0(a1)
-	addiu	a1,a1,1
-	addiu	a0,a0,1
-	bne	a0,a3,.Lua_smallCopy_loop
-	 sb	v1,-1(a0)
-
-	j	ra
-	 nop
-
-	.set	at
-	.set	reorder
-
-END(memcpy)
-
-
-/************************************************************************
- *  Implementation : Static functions
- ************************************************************************/
diff --git a/libc/arch-mips64/string/memset.S b/libc/arch-mips64/string/memset.S
deleted file mode 100644
index 09b756b..0000000
--- a/libc/arch-mips64/string/memset.S
+++ /dev/null
@@ -1,242 +0,0 @@
-/*
- * Copyright (c) 2009
- *      MIPS Technologies, Inc., California.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. 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.
- * 3. Neither the name of the MIPS Technologies, Inc., 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 MIPS TECHNOLOGIES, INC. ``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 MIPS TECHNOLOGIES, INC. 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.
- */
-
-/************************************************************************
- *
- *  memset.S, version "64h" with 1 cache line horizon for "pref 30" and 14 nops
- *  Version: "043009"
- *
- ************************************************************************/
-
-
-/************************************************************************
- *  Include files
- ************************************************************************/
-
-#include <private/bionic_asm.h>
-
-/*
- * This routine could be optimized for MIPS64. The current code only
- * uses MIPS32 instructions.
- */
-
-#if defined(__MIPSEB__)
-#  define SWHI	swl		/* high part is left in big-endian	*/
-#  define SWLO	swr		/* low part is right in big-endian	*/
-#endif
-
-#if defined(__MIPSEL__)
-#  define SWHI	swr		/* high part is right in little-endian	*/
-#  define SWLO	swl		/* low part is left in little-endian	*/
-#endif
-
-#if !(defined(XGPROF) || defined(XPROF))
-#undef SETUP_GP
-#define SETUP_GP
-#endif
-
-#ifdef NDEBUG
-#define DBG #
-#else
-#define DBG
-#endif
-
-LEAF(memset,0)
-
-	.set	noreorder
-	.set	noat
-
-	addu	t0,a0,a2		# t0 is the "past the end" address
-	slti	AT,a2,4			# is a2 less than 4?
-	bne	AT,zero,.Llast4		# if yes, go to last4
-	 move	v0,a0			# memset returns the dst pointer
-
-	beq	a1,zero,.Lset0
-	 subu	v1,zero,a0
-
-	# smear byte into 32 bit word
-#if (__mips==32) && (__mips_isa_rev>=2)
-	ins     a1, a1, 8, 8        # Replicate fill byte into half-word.
-	ins     a1, a1, 16, 16      # Replicate fill byte into word.
-#else
-	and	a1,0xff
-	sll	AT,a1,8
-	or	a1,AT
-	sll	AT,a1,16
-	or	a1,AT
-#endif
-
-.Lset0:
-	andi	v1,v1,0x3		# word-unaligned address?
-	beq	v1,zero,.Laligned	# v1 is the unalignment count
-	 subu	a2,a2,v1
-	SWHI	a1,0(a0)
-	addu	a0,a0,v1
-
-# Here we have the "word-aligned" a0 (until the "last4")
-.Laligned:
-	andi	t8,a2,0x3f	# any 64-byte chunks?
-				# t8 is the byte count past 64-byte chunks
-	beq	a2,t8,.Lchk8w	# when a2==t8, no 64-byte chunks
-				# There will be at most 1 32-byte chunk then
-	 subu	a3,a2,t8	# subtract from a2 the reminder
-				# Here a3 counts bytes in 16w chunks
-	addu	a3,a0,a3	# Now a3 is the final dst after 64-byte chunks
-
-# Find out, if there are any 64-byte chunks after which will be still at least
-# 96 bytes left. The value "96" is calculated as needed buffer for
-# "pref 30,64(a0)" prefetch, which can be used as "pref 30,0(a0)" after
-# incrementing "a0" by 64.
-# For "a2" below 160 there will be no such "pref 30 safe" 64-byte chunk.
-#
-	sltiu	v1,a2,160
-	bgtz	v1,.Lloop16w_nopref30	# skip "pref 30,0(a0)"
-	 subu	t7,a2,96	# subtract "pref 30 unsafe" region
-		# below we have at least 1 64-byte chunk which is "pref 30 safe"
-	andi	t6,t7,0x3f	# t6 is past "64-byte safe chunks" reminder
-	subu	t5,t7,t6	# subtract from t7 the reminder
-				# Here t5 counts bytes in 16w "safe" chunks
-	addu	t4,a0,t5	# Now t4 is the dst after 64-byte "safe" chunks
-
-# Don't use "pref 30,0(a0)" for a0 in a "middle" of a cache line
-#	pref	30,0(a0)
-# Here we are in the region, where it is safe to use "pref 30,64(a0)"
-.Lloop16w:
-	addiu	a0,a0,64
-	pref	30,-32(a0)	# continue setting up the dest, addr 64-32
-	sw	a1,-64(a0)
-	sw	a1,-60(a0)
-	sw	a1,-56(a0)
-	sw	a1,-52(a0)
-	sw	a1,-48(a0)
-	sw	a1,-44(a0)
-	sw	a1,-40(a0)
-	sw	a1,-36(a0)
-	nop
-	nop			# the extra nop instructions help to balance
-	nop			# cycles needed for "store" + "fill" + "evict"
-	nop			# For 64byte store there are needed 8 fill
-	nop			# and 8 evict cycles, i.e. at least 32 instr.
-	nop
-	nop
-	pref	30,0(a0)	# continue setting up the dest, addr 64-0
-	sw	a1,-32(a0)
-	sw	a1,-28(a0)
-	sw	a1,-24(a0)
-	sw	a1,-20(a0)
-	sw	a1,-16(a0)
-	sw	a1,-12(a0)
-	sw	a1,-8(a0)
-	sw	a1,-4(a0)
-	nop
-	nop
-	nop
-	nop			# NOTE: adding 14 nop-s instead of 12 nop-s
-	nop			# gives better results for "fast" memory
-	nop
-	bne	a0,t4,.Lloop16w
-	 nop
-
-	beq	a0,a3,.Lchk8w	# maybe no more 64-byte chunks?
-	 nop			# this "delayed slot" is useless ...
-
-.Lloop16w_nopref30:	# there could be up to 3 "64-byte nopref30" chunks
-	addiu	a0,a0,64
-	sw	a1,-64(a0)
-	sw	a1,-60(a0)
-	sw	a1,-56(a0)
-	sw	a1,-52(a0)
-	sw	a1,-48(a0)
-	sw	a1,-44(a0)
-	sw	a1,-40(a0)
-	sw	a1,-36(a0)
-	sw	a1,-32(a0)
-	sw	a1,-28(a0)
-	sw	a1,-24(a0)
-	sw	a1,-20(a0)
-	sw	a1,-16(a0)
-	sw	a1,-12(a0)
-	sw	a1,-8(a0)
-	bne	a0,a3,.Lloop16w_nopref30
-	 sw	a1,-4(a0)
-
-.Lchk8w:		# t8 here is the byte count past 64-byte chunks
-
-	andi	t7,t8,0x1f	# is there a 32-byte chunk?
-				# the t7 is the reminder count past 32-bytes
-	beq	t8,t7,.Lchk1w	# when t8==t7, no 32-byte chunk
-	 move	a2,t7
-
-	sw	a1,0(a0)
-	sw	a1,4(a0)
-	sw	a1,8(a0)
-	sw	a1,12(a0)
-	sw	a1,16(a0)
-	sw	a1,20(a0)
-	sw	a1,24(a0)
-	sw	a1,28(a0)
-	addiu	a0,a0,32
-
-.Lchk1w:
-	andi	t8,a2,0x3	# now t8 is the reminder past 1w chunks
-	beq	a2,t8,.Llast4aligned
-	 subu	a3,a2,t8	# a3 is the count of bytes in 1w chunks
-	addu	a3,a0,a3	# now a3 is the dst address past the 1w chunks
-
-# copying in words (4-byte chunks)
-.LwordCopy_loop:
-	addiu	a0,a0,4
-	bne	a0,a3,.LwordCopy_loop
-	 sw	a1,-4(a0)
-
-# store last 0-3 bytes
-# this will repeat the last store if the memset finishes on a word boundary
-.Llast4aligned:
-	j	ra
-	 SWLO	a1,-1(t0)
-
-.Llast4:
-	beq	a0,t0,.Llast4e
-.Llast4l:
-	 addiu	a0,a0,1
-	bne	a0,t0,.Llast4l
-	 sb	a1,-1(a0)
-.Llast4e:
-	j	ra
-	 nop
-
-	.set	at
-	.set	reorder
-
-END(memset)
-
-
-/************************************************************************
- *  Implementation : Static functions
- ************************************************************************/
diff --git a/libc/arch-mips64/string/mips-string-ops.h b/libc/arch-mips64/string/mips-string-ops.h
deleted file mode 100644
index e635ba1..0000000
--- a/libc/arch-mips64/string/mips-string-ops.h
+++ /dev/null
@@ -1,148 +0,0 @@
-/*
- * Copyright (c) 2010 MIPS Technologies, Inc.
- *
- * 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 MIPS Technologies Inc. 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 __MIPS_STRING_OPS_H
-#define __MIPS_STRING_OPS_H
-    /* This definition of the byte bitfields uses the
-       assumption that the layout of the bitfields is
-       equivalent to the layout in memory.  Generally,
-       for the MIPS ABIs, this is true. If you compile
-       the strcmp.c file with -DSMOKE_TEST_NEW_STRCMP,
-       this assumption will be tested.
-
-       Also, regardless of char signedness, ANSI C dictates that
-       strcmp() treats each character as unsigned char.  For
-       strlen and the like, signedness doesn't matter.
-
-       Also, this code assumes that there are 8-bits per 'char'.  */
-
-#if __mips64
-typedef struct bits
-{
-  unsigned long B0:8, B1:8, B2:8, B3:8, B4:8, B5:8, B6:8, B7:8;
-} bits_t;
-#else
-typedef struct bits
-{
-  unsigned long B0:8, B1:8, B2:8, B3:8;
-} bits_t;
-#endif
-
-#ifndef _ULW
-    /* for MIPS GCC, there is no unaligned builtins - so this code forces
-       the compiler to treat the pointer access as unaligned.  */
-struct ulw
-{
-  unsigned long b;
-} __attribute__ ((packed));
-
-#define _ULW(__x) ((struct ulw *) ((char *)(&__x)))->b;
-#endif
-
-/* This union assumes that small structures can be in registers.  If
-   not, then memory accesses will be done - not optimal, but ok.  */
-typedef union
-{
-  unsigned long v;
-  bits_t b;
-} bitfields_t;
-
-#ifndef detect_zero
-/* __mips_dsp, __mips_dspr2, and __mips64 are predefined by
-   the compiler, based on command line options.  */
-#if (__mips_dsp || __mips_dspr2) && !__mips64
-#define __mips_using_dsp 1
-
-/* DSP 4-lane (8 unsigned bits per line) subtract and saturate
- * Intrinsic operation. How this works:
- *     Given a 4-byte string of "ABC\0", subtract this as
- *     an unsigned integer from 0x01010101:
- *	   0x01010101
- *       - 0x41424300
- *        -----------
- (         0xbfbebe01 <-- answer without saturation
- *	   0x00000001 <-- answer with saturation
- * When this 4-lane vector is treated as an unsigned int value,
- * a non-zero answer indicates the presence of a zero in the
- * original 4-byte argument.  */
-
-typedef signed char v4i8 __attribute__ ((vector_size (4)));
-
-#define detect_zero(__x,__y,__01s,__80s)\
-       ((unsigned) __builtin_mips_subu_s_qb((v4i8) __01s,(v4i8) __x))
-
-    /* sets all 4 lanes to requested byte.  */
-#define set_byte_lanes(__x) ((unsigned) __builtin_mips_repl_qb(__x))
-
-    /* sets all 4 lanes to 0x01.  */
-#define def_and_set_01(__x) unsigned long __x = (unsigned) __builtin_mips_repl_qb(0x01)
-
-    /* sets all 4 lanes to 0x80. Not needed when subu_s.qb used. */
-#define def_and_set_80(__x) /* do nothing */
-
-#else
-    /* this version, originally published in the 80's, uses
-       a reverse-carry-set like determination of the zero byte.
-       The steps are, for __x = 0x31ff0001:
-       __x - _01s = 0x30fdff00
-       ~__x = 0xce00fffe
-       ((__x - _01s) & ~__x) = 0x0000ff00
-       x & _80s = 0x00008000 <- byte 3 was zero
-       Some implementaions naively assume that characters are
-       always 7-bit unsigned ASCII. With that assumption, the
-       "& ~x" is usually discarded. Since character strings
-       are 8-bit, the and is needed to catch the case of
-       a false positive when the byte is 0x80. */
-
-#define detect_zero(__x,__y,_01s,_80s)\
-	((unsigned) (((__x) - _01s) & ~(__x)) & _80s)
-
-#if __mips64
-#define def_and_set_80(__x) unsigned long __x =  0x8080808080808080ul
-#define def_and_set_01(__x)  unsigned long __x = 0x0101010101010101ul
-#else
-#define def_and_set_80(__x) unsigned long __x = 0x80808080ul
-#define def_and_set_01(__x) unsigned long __x = 0x01010101ul
-#endif
-
-#endif
-#endif
-
-/* dealing with 'void *' conversions without using extra variables. */
-#define get_byte(__x,__idx) (((unsigned char *) (__x))[__idx])
-#define set_byte(__x,__idx,__fill) ((unsigned char *) (__x))[__idx] = (__fill)
-#define get_word(__x,__idx) (((unsigned long *) (__x))[__idx])
-#define set_word(__x,__idx,__fill) ((unsigned long *) (__x))[__idx] = (__fill)
-#define inc_ptr_as(__type,__x,__inc) __x = (void *) (((__type) __x) + (__inc))
-#define cvt_ptr_to(__type,__x) ((__type) (__x))
-
-#endif
diff --git a/libc/arch-mips64/string/mips_strlen.c b/libc/arch-mips64/string/mips_strlen.c
deleted file mode 100644
index 37e5865..0000000
--- a/libc/arch-mips64/string/mips_strlen.c
+++ /dev/null
@@ -1,224 +0,0 @@
-/*
- * Copyright (c) 2010 MIPS Technologies, Inc.
- *
- * 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 MIPS Technologies Inc. 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.
- */
-
-#include <string.h>
-#include "mips-string-ops.h"
-
-#define do_strlen_word(__av) {\
-    if (detect_zero(x,x,_01s,_80s)) break;\
-    x = __av;\
-    cnt += sizeof (unsigned);\
-    }
-
-#define do_strlen_byte(__x) {\
-  if ((bx.b.B##__x) == 0) break;\
-  ++cnt;\
-  }
-
-#if SMOKE_TEST_MIPS_STRLEN
-#define strlen my_strlen
-#endif
-
-size_t
-strlen (const char *_a)
-{
-  int cnt = 0;
-  unsigned long x;
-
-  /* align the string to word boundary so we can do word at a time.  */
-  if ((cvt_ptr_to (unsigned long, _a) & (sizeof (unsigned long) - 1)) != 0)
-    {
-      if ((cvt_ptr_to (unsigned long, _a) & 1) != 0)
-	{
-	  if (get_byte (_a, 0) == 0)
-	    return cnt;
-	  /* set bit 1 so 2-bytes are checked and incremented. */
-	  inc_ptr_as (char *, _a, 1);
-	  ++cnt;
-	}
-      if ((cvt_ptr_to (unsigned long, _a) & 2) != 0)
-	{
-	  if (get_byte (_a, 0) == 0)
-	    return cnt + 0;
-	  if (get_byte (_a, 1) == 0)
-	    return cnt + 1;
-	  inc_ptr_as (char *, _a, 2);
-	  cnt += 2;
-	}
-    }
-
-#if __mips64
-#error strlen: mips64 check for 4-byte alignment not implemented.
-#endif
-
-  if (1)
-    {
-      def_and_set_01 (_01s);
-      def_and_set_80 (_80s);
-
-      /* as advantagous as it is to performance, this code cannot pre-load
-         the following word, nor can it prefetch the next line at the start
-         of the loop since the string can be at the end of a page with the
-         following page unmapped. There are tests in the suite to catch
-         any attempt to go beyond the current word. */
-      x = get_word (_a, 0);
-      while (1)
-	{
-	  /* doing 8 words should cover most strings.  */
-	  do_strlen_word (get_word (_a, 1));
-	  do_strlen_word (get_word (_a, 2));
-	  do_strlen_word (get_word (_a, 3));
-	  do_strlen_word (get_word (_a, 4));
-	  do_strlen_word (get_word (_a, 5));
-	  do_strlen_word (get_word (_a, 6));
-	  do_strlen_word (get_word (_a, 7));
-	  do_strlen_word (get_word (_a, 8));
-	  inc_ptr_as (unsigned long*, _a, 8);
-	}
-    }
-  while (1)
-    {
-      /* pull apart the last word processed and find the zero.  */
-      bitfields_t bx;
-      bx.v = x;
-#if __mips64
-      do_strlen_byte (0);
-      do_strlen_byte (1);
-      do_strlen_byte (2);
-      do_strlen_byte (3);
-      do_strlen_byte (4);
-      do_strlen_byte (5);
-      do_strlen_byte (6);
-#else
-      do_strlen_byte (0);
-      do_strlen_byte (1);
-      do_strlen_byte (2);
-#endif
-      /* last byte is zero */
-      break;
-    }
-  return cnt;
-}
-
-#undef do_strlen_byte
-#undef do_strlen_word
-
-#if SMOKE_TEST_MIPS_STRLEN
-#include <stdio.h>
-char str1[] = "DHRYSTONE PROGRAM, 1'ST STRING";
-char str2[] = "DHRYSTONE PROGRAM, 2'ST STRING";
-
-char str3[] = "another string";
-char str4[] = "another";
-
-char str5[] = "somes tring";
-char str6[] = "somes_tring";
-
-char str7[16], str8[16];
-
-static char *
-chk (unsigned long mine, unsigned long libs, int *errors)
-{
-  static char answer[1024];
-  char *result = mine == libs ? "PASS" : "FAIL";
-  sprintf (answer, "new_strlen=%d: lib_strlen=%d: %s!", mine, libs, result);
-  if (mine != libs)
-    (*errors)++;
-  return answer;
-}
-
-int
-main (int argc, char **argv)
-{
-  int errors = 0;
-  /* set -1 in one position */
-  str6[5] = 0xff;
-  /* set zero in same position with junk in following 3 */
-  str7[0] = str8[0] = 0;
-  str7[1] = 0xff;
-  str7[2] = 'a';
-  str7[3] = 2;
-  str8[1] = 's';
-  str8[2] = -2;
-  str8[3] = 0;
-
-  fprintf (stderr, "========== mips_strlen%s test...\n",
-	   argv[0] ? argv[0] : "unknown strlen");
-#define P(__x,__y) {\
-    int a = my_strlen(__x + __y);\
-    int b = (strlen)(__x + __y) /* library version */;\
-    fprintf(stderr,"%s+%d: %s\n",#__x,__y,chk(a,b,&errors));\
-    }
-
-  P (str1, 0);
-  P (str1, 1);
-  P (str1, 2);
-  P (str1, 3);
-
-  P (str2, 0);
-  P (str2, 1);
-  P (str2, 2);
-  P (str2, 3);
-
-  P (str3, 0);
-  P (str3, 1);
-  P (str3, 2);
-  P (str3, 3);
-
-  P (str4, 0);
-  P (str4, 1);
-  P (str4, 2);
-  P (str4, 3);
-
-  P (str5, 0);
-  P (str5, 1);
-  P (str5, 2);
-  P (str5, 3);
-
-  P (str6, 0);
-  P (str6, 1);
-  P (str6, 2);
-  P (str6, 3);
-
-  P (str7, 0);
-  P (str7, 1);
-  P (str7, 2);
-  P (str7, 3);
-
-  P (str8, 0);
-  P (str8, 1);
-  P (str8, 2);
-  P (str8, 3);
-
-  return errors;
-}
-#endif