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These are library functions used by ARC700 architecture. Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Francois Bedard <fbedard@synopsys.com> Cc: Wolfgang Denk <wd@denx.de> Cc: Heiko Schocher <hs@denx.de>
142 lines
2.9 KiB
ArmAsm
142 lines
2.9 KiB
ArmAsm
/*
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* Copyright (C) 2004, 2007-2010, 2011-2014 Synopsys, Inc. All rights reserved.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/*
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* ARC700 has a relatively long pipeline and branch prediction, so we want
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* to avoid branches that are hard to predict. On the other hand, the
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* presence of the norm instruction makes it easier to operate on whole
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* words branch-free.
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*/
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.global strchr
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.align 4
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strchr:
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extb_s %r1, %r1
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asl %r5, %r1, 8
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bmsk %r2, %r0, 1
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or %r5, %r5, %r1
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mov_s %r3, 0x01010101
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breq.d %r2, %r0, .Laligned
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asl %r4, %r5, 16
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sub_s %r0, %r0, %r2
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asl %r7, %r2, 3
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ld_s %r2, [%r0]
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#ifdef __LITTLE_ENDIAN__
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asl %r7, %r3, %r7
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#else /* __BIG_ENDIAN__ */
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lsr %r7, %r3, %r7
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#endif /* _ENDIAN__ */
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or %r5, %r5, %r4
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ror %r4, %r3
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sub %r12, %r2, %r7
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bic_s %r12, %r12, %r2
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and %r12, %r12, %r4
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brne.d %r12, 0, .Lfound0_ua
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xor %r6, %r2, %r5
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ld.a %r2, [%r0, 4]
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sub %r12, %r6, %r7
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bic %r12, %r12, %r6
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#ifdef __LITTLE_ENDIAN__
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and %r7, %r12, %r4
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/* For speed, we want this branch to be unaligned. */
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breq %r7, 0, .Loop
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/* Likewise this one */
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b .Lfound_char
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#else /* __BIG_ENDIAN__ */
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and %r12, %r12, %r4
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/* For speed, we want this branch to be unaligned. */
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breq %r12, 0, .Loop
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lsr_s %r12, %r12, 7
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bic %r2, %r7, %r6
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b.d .Lfound_char_b
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and_s %r2, %r2, %r12
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#endif /* _ENDIAN__ */
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/* We require this code address to be unaligned for speed... */
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.Laligned:
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ld_s %r2, [%r0]
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or %r5, %r5, %r4
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ror %r4, %r3
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/* ... so that this code address is aligned, for itself and ... */
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.Loop:
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sub %r12, %r2, %r3
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bic_s %r12, %r12, %r2
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and %r12, %r12, %r4
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brne.d %r12, 0, .Lfound0
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xor %r6, %r2, %r5
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ld.a %r2, [%r0, 4]
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sub %r12, %r6, %r3
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bic %r12, %r12, %r6
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and %r7, %r12, %r4
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breq %r7, 0, .Loop
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/*
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*... so that this branch is unaligned.
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* Found searched-for character.
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* r0 has already advanced to next word.
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*/
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#ifdef __LITTLE_ENDIAN__
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/*
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* We only need the information about the first matching byte
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* (i.e. the least significant matching byte) to be exact,
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* hence there is no problem with carry effects.
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*/
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.Lfound_char:
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sub %r3, %r7, 1
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bic %r3, %r3, %r7
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norm %r2, %r3
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sub_s %r0, %r0, 1
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asr_s %r2, %r2, 3
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j.d [%blink]
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sub_s %r0, %r0, %r2
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.balign 4
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.Lfound0_ua:
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mov %r3, %r7
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.Lfound0:
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sub %r3, %r6, %r3
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bic %r3, %r3, %r6
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and %r2, %r3, %r4
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or_s %r12, %r12, %r2
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sub_s %r3, %r12, 1
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bic_s %r3, %r3, %r12
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norm %r3, %r3
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add_s %r0, %r0, 3
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asr_s %r12, %r3, 3
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asl.f 0, %r2, %r3
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sub_s %r0, %r0, %r12
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j_s.d [%blink]
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mov.pl %r0, 0
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#else /* __BIG_ENDIAN__ */
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.Lfound_char:
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lsr %r7, %r7, 7
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bic %r2, %r7, %r6
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.Lfound_char_b:
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norm %r2, %r2
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sub_s %r0, %r0, 4
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asr_s %r2, %r2, 3
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j.d [%blink]
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add_s %r0, %r0, %r2
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.Lfound0_ua:
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mov_s %r3, %r7
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.Lfound0:
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asl_s %r2, %r2, 7
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or %r7, %r6, %r4
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bic_s %r12, %r12, %r2
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sub %r2, %r7, %r3
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or %r2, %r2, %r6
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bic %r12, %r2, %r12
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bic.f %r3, %r4, %r12
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norm %r3, %r3
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add.pl %r3, %r3, 1
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asr_s %r12, %r3, 3
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asl.f 0, %r2, %r3
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add_s %r0, %r0, %r12
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j_s.d [%blink]
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mov.mi %r0, 0
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#endif /* _ENDIAN__ */
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