Acasă Explorează Ajutor
Autentificare
SoftwareDesign
/
csu3_am335x
8
0
Bifurcare 0
Fisiere Probleme 0 Trageți solicitările 0 Wiki
Ramură: master
Ramuri Etichete
csu3_am335x
/
board-support
/
u-boot-2017.01+gitAUTOINC+340fb36f04-g340fb36f04
/
arch
/
arc
/
lib
/
memcmp.S

memcmp.S 2.2 KB
Permalink Istoric Crud

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123 
  1. /*
    2. 

  2.  * Copyright (C) 2004, 2007-2010, 2011-2014 Synopsys, Inc. All rights reserved.
    3. 

  3.  *
    4. 

  4.  * SPDX-License-Identifier:	GPL-2.0+
    5. 

  5.  */
    6. 

  6. 

  7. #ifdef __LITTLE_ENDIAN__
    8. 

  8. #define WORD2 r2
    9. 

  9. #define SHIFT r3
    10. 

  10. #else /* __BIG_ENDIAN__ */
    11. 

  11. #define WORD2 r3
    12. 

  12. #define SHIFT r2
    13. 

  13. #endif /* _ENDIAN__ */
    14. 

  14. 

  15. .global memcmp
    16. 

  16. .align 4
    17. 

  17. memcmp:
    18. 

  18. 	or	%r12, %r0, %r1
    19. 

  19. 	asl_s	%r12, %r12, 30
    20. 

  20. 	sub	%r3, %r2, 1
    21. 

  21. 	brls	%r2, %r12, .Lbytewise
    22. 

  22. 	ld	%r4, [%r0, 0]
    23. 

  23. 	ld	%r5, [%r1, 0]
    24. 

  24. 	lsr.f	%lp_count, %r3, 3
    25. 

  25. 	lpne	.Loop_end
    26. 

  26. 	ld_s	WORD2, [%r0, 4]
    27. 

  27. 	ld_s	%r12, [%r1, 4]
    28. 

  28. 	brne	%r4, %r5, .Leven
    29. 

  29. 	ld.a	%r4, [%r0, 8]
    30. 

  30. 	ld.a	%r5, [%r1, 8]
    31. 

  31. 	brne	WORD2, %r12, .Lodd
    32. 

  32. 	nop
    33. 

  33. .Loop_end:
    34. 

  34. 	asl_s	SHIFT, SHIFT, 3
    35. 

  35. 	bhs_s	.Last_cmp
    36. 

  36. 	brne	%r4, %r5, .Leven
    37. 

  37. 	ld	%r4, [%r0, 4]
    38. 

  38. 	ld	%r5, [%r1, 4]
    39. 

  39. #ifdef __LITTLE_ENDIAN__
    40. 

  40. 	nop_s
    41. 

  41. 	/* one more load latency cycle */
    42. 

  42. .Last_cmp:
    43. 

  43. 	xor	%r0, %r4, %r5
    44. 

  44. 	bset	%r0, %r0, SHIFT
    45. 

  45. 	sub_s	%r1, %r0, 1
    46. 

  46. 	bic_s	%r1, %r1, %r0
    47. 

  47. 	norm	%r1, %r1
    48. 

  48. 	b.d	.Leven_cmp
    49. 

  49. 	and	%r1, %r1, 24
    50. 

  50. .Leven:
    51. 

  51. 	xor	%r0, %r4, %r5
    52. 

  52. 	sub_s	%r1, %r0, 1
    53. 

  53. 	bic_s	%r1, %r1, %r0
    54. 

  54. 	norm	%r1, %r1
    55. 

  55. 	/* slow track insn */
    56. 

  56. 	and	%r1, %r1, 24
    57. 

  57. .Leven_cmp:
    58. 

  58. 	asl	%r2, %r4, %r1
    59. 

  59. 	asl	%r12, %r5, %r1
    60. 

  60. 	lsr_s	%r2, %r2, 1
    61. 

  61. 	lsr_s	%r12, %r12, 1
    62. 

  62. 	j_s.d	[%blink]
    63. 

  63. 	sub	%r0, %r2, %r12
    64. 

  64. 	.balign	4
    65. 

  65. .Lodd:
    66. 

  66. 	xor	%r0, WORD2, %r12
    67. 

  67. 	sub_s	%r1, %r0, 1
    68. 

  68. 	bic_s	%r1, %r1, %r0
    69. 

  69. 	norm	%r1, %r1
    70. 

  70. 	/* slow track insn */
    71. 

  71. 	and	%r1, %r1, 24
    72. 

  72. 	asl_s	%r2, %r2, %r1
    73. 

  73. 	asl_s	%r12, %r12, %r1
    74. 

  74. 	lsr_s	%r2, %r2, 1
    75. 

  75. 	lsr_s	%r12, %r12, 1
    76. 

  76. 	j_s.d	[%blink]
    77. 

  77. 	sub	%r0, %r2, %r12
    78. 

  78. #else /* __BIG_ENDIAN__ */
    79. 

  79. .Last_cmp:
    80. 

  80. 	neg_s	SHIFT, SHIFT
    81. 

  81. 	lsr	%r4, %r4, SHIFT
    82. 

  82. 	lsr	%r5, %r5, SHIFT
    83. 

  83. 	/* slow track insn */
    84. 

  84. .Leven:
    85. 

  85. 	sub.f	%r0, %r4, %r5
    86. 

  86. 	mov.ne	%r0, 1
    87. 

  87. 	j_s.d	[%blink]
    88. 

  88. 	bset.cs	%r0, %r0, 31
    89. 

  89. .Lodd:
    90. 

  90. 	cmp_s	WORD2, %r12
    91. 

  91. 

  92. 	mov_s	%r0, 1
    93. 

  93. 	j_s.d	[%blink]
    94. 

  94. 	bset.cs	%r0, %r0, 31
    95. 

  95. #endif /* _ENDIAN__ */
    96. 

  96. 	.balign	4
    97. 

  97. .Lbytewise:
    98. 

  98. 	breq	%r2, 0, .Lnil
    99. 

  99. 	ldb	%r4, [%r0, 0]
    100. 

  100. 	ldb	%r5, [%r1, 0]
    101. 

  101. 	lsr.f	%lp_count, %r3
    102. 

  102. 	lpne	.Lbyte_end
    103. 

  103. 	ldb_s	%r3, [%r0, 1]
    104. 

  104. 	ldb	%r12, [%r1, 1]
    105. 

  105. 	brne	%r4, %r5, .Lbyte_even
    106. 

  106. 	ldb.a	%r4, [%r0, 2]
    107. 

  107. 	ldb.a	%r5, [%r1, 2]
    108. 

  108. 	brne	%r3, %r12, .Lbyte_odd
    109. 

  109. 	nop
    110. 

  110. .Lbyte_end:
    111. 

  111. 	bcc	.Lbyte_even
    112. 

  112. 	brne	%r4, %r5, .Lbyte_even
    113. 

  113. 	ldb_s	%r3, [%r0, 1]
    114. 

  114. 	ldb_s	%r12, [%r1, 1]
    115. 

  115. .Lbyte_odd:
    116. 

  116. 	j_s.d	[%blink]
    117. 

  117. 	sub	%r0, %r3, %r12
    118. 

  118. .Lbyte_even:
    119. 

  119. 	j_s.d	[%blink]
    120. 

  120. 	sub	%r0, %r4, %r5
    121. 

  121. .Lnil:
    122. 

  122. 	j_s.d	[%blink]
    123. 

  123. 	mov	%r0, 0
    124.