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strlen.S

strlen.S 1.5 KB
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  1. /* strlen.S: Sparc optimized strlen code
    2. 

  2.  * Hand optimized from GNU libc's strlen
    3. 

  3.  * Copyright (C) 1991,1996 Free Software Foundation
    4. 

  4.  * Copyright (C) 1996,2008 David S. Miller (davem@davemloft.net)
    5. 

  5.  * Copyright (C) 1996, 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
    6. 

  6.  */
    7. 

  7. 

  8. #include <linux/linkage.h>
    9. 

  9. #include <asm/asm.h>
    10. 

  10. #include <asm/export.h>
    11. 

  11. 

  12. #define LO_MAGIC 0x01010101
    13. 

  13. #define HI_MAGIC 0x80808080
    14. 

  14. 

  15. 	.text
    16. 

  16. ENTRY(strlen)
    17. 

  17. 	mov	%o0, %o1
    18. 

  18. 	andcc	%o0, 3, %g0
    19. 

  19. 	BRANCH32(be, pt, 9f)
    20. 

  20. 	 sethi	%hi(HI_MAGIC), %o4
    21. 

  21. 	ldub	[%o0], %o5
    22. 

  22. 	BRANCH_REG_ZERO(pn, %o5, 11f)
    23. 

  23. 	 add	%o0, 1, %o0
    24. 

  24. 	andcc	%o0, 3, %g0
    25. 

  25. 	BRANCH32(be, pn, 4f)
    26. 

  26. 	 or	%o4, %lo(HI_MAGIC), %o3
    27. 

  27. 	ldub	[%o0], %o5
    28. 

  28. 	BRANCH_REG_ZERO(pn, %o5, 12f)
    29. 

  29. 	 add	%o0, 1, %o0
    30. 

  30. 	andcc	%o0, 3, %g0
    31. 

  31. 	BRANCH32(be, pt, 5f)
    32. 

  32. 	 sethi	%hi(LO_MAGIC), %o4
    33. 

  33. 	ldub	[%o0], %o5
    34. 

  34. 	BRANCH_REG_ZERO(pn, %o5, 13f)
    35. 

  35. 	 add	%o0, 1, %o0
    36. 

  36. 	BRANCH32(ba, pt, 8f)
    37. 

  37. 	 or	%o4, %lo(LO_MAGIC), %o2
    38. 

  38. 9:
    39. 

  39. 	or	%o4, %lo(HI_MAGIC), %o3
    40. 

  40. 4:
    41. 

  41. 	sethi	%hi(LO_MAGIC), %o4
    42. 

  42. 5:
    43. 

  43. 	or	%o4, %lo(LO_MAGIC), %o2
    44. 

  44. 8:
    45. 

  45. 	ld	[%o0], %o5
    46. 

  46. 2:
    47. 

  47. 	sub	%o5, %o2, %o4
    48. 

  48. 	andcc	%o4, %o3, %g0
    49. 

  49. 	BRANCH32(be, pt, 8b)
    50. 

  50. 	 add	%o0, 4, %o0
    51. 

  51. 

  52. 	/* Check every byte. */
    53. 

  53. 	srl	%o5, 24, %g7
    54. 

  54. 	andcc	%g7, 0xff, %g0
    55. 

  55. 	BRANCH32(be, pn, 1f)
    56. 

  56. 	 add	%o0, -4, %o4
    57. 

  57. 	srl	%o5, 16, %g7
    58. 

  58. 	andcc	%g7, 0xff, %g0
    59. 

  59. 	BRANCH32(be, pn, 1f)
    60. 

  60. 	 add	%o4, 1, %o4
    61. 

  61. 	srl	%o5, 8, %g7
    62. 

  62. 	andcc	%g7, 0xff, %g0
    63. 

  63. 	BRANCH32(be, pn, 1f)
    64. 

  64. 	 add	%o4, 1, %o4
    65. 

  65. 	andcc	%o5, 0xff, %g0
    66. 

  66. 	BRANCH32_ANNUL(bne, pt, 2b)
    67. 

  67. 	 ld	[%o0], %o5
    68. 

  68. 	add	%o4, 1, %o4
    69. 

  69. 1:
    70. 

  70. 	retl
    71. 

  71. 	 sub	%o4, %o1, %o0
    72. 

  72. 11:
    73. 

  73. 	retl
    74. 

  74. 	 mov	0, %o0
    75. 

  75. 12:
    76. 

  76. 	retl
    77. 

  77. 	 mov	1, %o0
    78. 

  78. 13:
    79. 

  79. 	retl
    80. 

  80. 	 mov	2, %o0
    81. 

  81. ENDPROC(strlen)
    82. 

  82. EXPORT_SYMBOL(strlen)
    83. 

  83.