arc: Get rid of handwritten string routines

U-Boot is a bit special piese of software because it is being
only executed once on power-on as compared to operating system
for example. That's why we don't care much about performance
optimizations instead we're more concerned about size. And up-to-date
compilers might produce much smaller code compared to
performance-optimized routines copy-pasted from the Linux kernel.

Here's an example:
------------------------------->8--------------------------
--- size_asm_strings.txt
+++ size_c_strings.txt
@@ -1,2 +1,2 @@
    text	   data	    bss	    dec	    hex	filename
- 121260	   3784	   3308	 128352	  1f560	u-boot
+ 120448	   3784	   3308	 127540	  1f234	u-boot
------------------------------->8--------------------------

See we were able to shave off ~800 bytes of .text section.

Also usage of string routines implemented in C gives us an ability
to support more HW flavors for free: generated instructions will match
our target as long as correct compiler option is used.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

1 files changed, 0 insertions, 141 deletions

diff --git a/arch/arc/lib/strchr-700.S b/arch/arc/lib/strchr-700.S
deleted file mode 100644
index 55fcc9fb00..0000000000
--- a/arch/arc/lib/strchr-700.S
+++ /dev/null
@@ -1,141 +0,0 @@
-/*
- * Copyright (C) 2004, 2007-2010, 2011-2014 Synopsys, Inc. All rights reserved.
- *
- * SPDX-License-Identifier:	GPL-2.0+
- */
-
-/*
- * ARC700 has a relatively long pipeline and branch prediction, so we want
- * to avoid branches that are hard to predict.  On the other hand, the
- * presence of the norm instruction makes it easier to operate on whole
- * words branch-free.
- */
-
-.global strchr
-.align 4
-strchr:
-	extb_s	%r1, %r1
-	asl	%r5, %r1, 8
-	bmsk	%r2, %r0, 1
-	or	%r5, %r5, %r1
-	mov_s	%r3, 0x01010101
-	breq.d	%r2, %r0, .Laligned
-	asl	%r4, %r5, 16
-	sub_s	%r0, %r0, %r2
-	asl	%r7, %r2, 3
-	ld_s	%r2, [%r0]
-#ifdef __LITTLE_ENDIAN__
-	asl	%r7, %r3, %r7
-#else /* __BIG_ENDIAN__ */
-	lsr	%r7, %r3, %r7
-#endif /* _ENDIAN__ */
-	or	%r5, %r5, %r4
-	ror	%r4, %r3
-	sub	%r12, %r2, %r7
-	bic_s	%r12, %r12, %r2
-	and	%r12, %r12, %r4
-	brne.d	%r12, 0, .Lfound0_ua
-	xor	%r6, %r2, %r5
-	ld.a	%r2, [%r0, 4]
-	sub	%r12, %r6, %r7
-	bic	%r12, %r12, %r6
-#ifdef __LITTLE_ENDIAN__
-	and	%r7, %r12, %r4
-	/* For speed, we want this branch to be unaligned. */
-	breq	%r7, 0, .Loop
-	/* Likewise this one */
-	b	.Lfound_char
-#else /* __BIG_ENDIAN__ */
-	and	%r12, %r12, %r4
-	/* For speed, we want this branch to be unaligned. */
-	breq	%r12, 0, .Loop
-	lsr_s	%r12, %r12, 7
-	bic 	%r2, %r7, %r6
-	b.d	.Lfound_char_b
-	and_s	%r2, %r2, %r12
-#endif /* _ENDIAN__ */
-	/* We require this code address to be unaligned for speed...  */
-.Laligned:
-	ld_s	%r2, [%r0]
-	or	%r5, %r5, %r4
-	ror	%r4, %r3
-	/* ... so that this code address is aligned, for itself and ...  */
-.Loop:
-	sub	%r12, %r2, %r3
-	bic_s	%r12, %r12, %r2
-	and	%r12, %r12, %r4
-	brne.d	%r12, 0, .Lfound0
-	xor	%r6, %r2, %r5
-	ld.a	%r2, [%r0, 4]
-	sub	%r12, %r6, %r3
-	bic	%r12, %r12, %r6
-	and	%r7, %r12, %r4
-	breq	%r7, 0, .Loop
-	/*
-	 *... so that this branch is unaligned.
-	 * Found searched-for character.
-	 * r0 has already advanced to next word.
-	 */
-#ifdef __LITTLE_ENDIAN__
-	/*
-	 * We only need the information about the first matching byte
-	 * (i.e. the least significant matching byte) to be exact,
-	 * hence there is no problem with carry effects.
-	 */
-.Lfound_char:
-	sub	%r3, %r7, 1
-	bic	%r3, %r3, %r7
-	norm	%r2, %r3
-	sub_s	%r0, %r0, 1
-	asr_s	%r2, %r2, 3
-	j.d	[%blink]
-	sub_s	%r0, %r0, %r2
-
-	.balign	4
-.Lfound0_ua:
-	mov	%r3, %r7
-.Lfound0:
-	sub	%r3, %r6, %r3
-	bic	%r3, %r3, %r6
-	and	%r2, %r3, %r4
-	or_s	%r12, %r12, %r2
-	sub_s	%r3, %r12, 1
-	bic_s	%r3, %r3, %r12
-	norm	%r3, %r3
-	add_s	%r0, %r0, 3
-	asr_s	%r12, %r3, 3
-	asl.f	0, %r2, %r3
-	sub_s	%r0, %r0, %r12
-	j_s.d	[%blink]
-	mov.pl	%r0, 0
-#else /* __BIG_ENDIAN__ */
-.Lfound_char:
-	lsr	%r7, %r7, 7
-
-	bic	%r2, %r7, %r6
-.Lfound_char_b:
-	norm	%r2, %r2
-	sub_s	%r0, %r0, 4
-	asr_s	%r2, %r2, 3
-	j.d	[%blink]
-	add_s	%r0, %r0, %r2
-
-.Lfound0_ua:
-	mov_s	%r3, %r7
-.Lfound0:
-	asl_s	%r2, %r2, 7
-	or	%r7, %r6, %r4
-	bic_s	%r12, %r12, %r2
-	sub	%r2, %r7, %r3
-	or	%r2, %r2, %r6
-	bic	%r12, %r2, %r12
-	bic.f	%r3, %r4, %r12
-	norm	%r3, %r3
-
-	add.pl	%r3, %r3, 1
-	asr_s	%r12, %r3, 3
-	asl.f	0, %r2, %r3
-	add_s	%r0, %r0, %r12
-	j_s.d	[%blink]
-	mov.mi	%r0, 0
-#endif /* _ENDIAN__ */