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https://github.com/AsahiLinux/u-boot
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f958a91fa5
It's prohibited to put branch instruction in the very end of zero-delay loop. On execution this causes "Illegal instruction" exception. Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Signed-off-by: Igor Guryanov <guryanov@synopsys.com>
123 lines
2.2 KiB
ArmAsm
123 lines
2.2 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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#ifdef __LITTLE_ENDIAN__
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#define WORD2 r2
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#define SHIFT r3
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#else /* __BIG_ENDIAN__ */
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#define WORD2 r3
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#define SHIFT r2
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#endif /* _ENDIAN__ */
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.global memcmp
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.align 4
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memcmp:
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or %r12, %r0, %r1
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asl_s %r12, %r12, 30
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sub %r3, %r2, 1
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brls %r2, %r12, .Lbytewise
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ld %r4, [%r0, 0]
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ld %r5, [%r1, 0]
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lsr.f %lp_count, %r3, 3
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lpne .Loop_end
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ld_s WORD2, [%r0, 4]
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ld_s %r12, [%r1, 4]
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brne %r4, %r5, .Leven
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ld.a %r4, [%r0, 8]
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ld.a %r5, [%r1, 8]
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brne WORD2, %r12, .Lodd
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nop
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.Loop_end:
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asl_s SHIFT, SHIFT, 3
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bhs_s .Last_cmp
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brne %r4, %r5, .Leven
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ld %r4, [%r0, 4]
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ld %r5, [%r1, 4]
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#ifdef __LITTLE_ENDIAN__
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nop_s
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/* one more load latency cycle */
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.Last_cmp:
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xor %r0, %r4, %r5
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bset %r0, %r0, SHIFT
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sub_s %r1, %r0, 1
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bic_s %r1, %r1, %r0
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norm %r1, %r1
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b.d .Leven_cmp
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and %r1, %r1, 24
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.Leven:
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xor %r0, %r4, %r5
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sub_s %r1, %r0, 1
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bic_s %r1, %r1, %r0
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norm %r1, %r1
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/* slow track insn */
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and %r1, %r1, 24
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.Leven_cmp:
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asl %r2, %r4, %r1
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asl %r12, %r5, %r1
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lsr_s %r2, %r2, 1
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lsr_s %r12, %r12, 1
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j_s.d [%blink]
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sub %r0, %r2, %r12
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.balign 4
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.Lodd:
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xor %r0, WORD2, %r12
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sub_s %r1, %r0, 1
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bic_s %r1, %r1, %r0
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norm %r1, %r1
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/* slow track insn */
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and %r1, %r1, 24
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asl_s %r2, %r2, %r1
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asl_s %r12, %r12, %r1
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lsr_s %r2, %r2, 1
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lsr_s %r12, %r12, 1
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j_s.d [%blink]
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sub %r0, %r2, %r12
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#else /* __BIG_ENDIAN__ */
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.Last_cmp:
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neg_s SHIFT, SHIFT
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lsr %r4, %r4, SHIFT
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lsr %r5, %r5, SHIFT
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/* slow track insn */
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.Leven:
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sub.f %r0, %r4, %r5
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mov.ne %r0, 1
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j_s.d [%blink]
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bset.cs %r0, %r0, 31
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.Lodd:
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cmp_s WORD2, %r12
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mov_s %r0, 1
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j_s.d [%blink]
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bset.cs %r0, %r0, 31
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#endif /* _ENDIAN__ */
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.balign 4
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.Lbytewise:
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breq %r2, 0, .Lnil
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ldb %r4, [%r0, 0]
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ldb %r5, [%r1, 0]
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lsr.f %lp_count, %r3
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lpne .Lbyte_end
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ldb_s %r3, [%r0, 1]
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ldb %r12, [%r1, 1]
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brne %r4, %r5, .Lbyte_even
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ldb.a %r4, [%r0, 2]
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ldb.a %r5, [%r1, 2]
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brne %r3, %r12, .Lbyte_odd
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nop
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.Lbyte_end:
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bcc .Lbyte_even
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brne %r4, %r5, .Lbyte_even
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ldb_s %r3, [%r0, 1]
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ldb_s %r12, [%r1, 1]
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.Lbyte_odd:
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j_s.d [%blink]
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sub %r0, %r3, %r12
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.Lbyte_even:
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j_s.d [%blink]
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sub %r0, %r4, %r5
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.Lnil:
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j_s.d [%blink]
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mov %r0, 0
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