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memset.S

memset.S 1.9 KB
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  1. /* Cloned and hacked for uClibc by Paul Mundt, December 2003 */
    2. 

  2. /* Modified by SuperH, Inc. September 2003 */
    3. 

  3. !
    4. 

  4. ! Fast SH memset
    5. 

  5. !
    6. 

  6. ! by Toshiyasu Morita (tm@netcom.com)
    7. 

  7. !
    8. 

  8. ! SH5 code by J"orn Rennecke (joern.rennecke@superh.com)
    9. 

  9. ! Copyright 2002 SuperH Ltd.
    10. 

  10. !
    11. 

  11. 

  12. #if __BYTE_ORDER == __LITTLE_ENDIAN
    13. 

  13. #define SHHI shlld
    14. 

  14. #define SHLO shlrd
    15. 

  15. #else
    16. 

  16. #define SHHI shlrd
    17. 

  17. #define SHLO shlld
    18. 

  18. #endif
    19. 

  19. 

  20. 	.section .text..SHmedia32,"ax"
    21. 

  21. 	.globl	memset
    22. 

  22. 	.type	memset, @function
    23. 

  23. 

  24. 	.align 5
    25. 

  25. 

  26. memset:
    27. 

  27. 	pta/l multiquad, tr0
    28. 

  28. 	andi r2, 7, r22
    29. 

  29. 	ptabs r18, tr2
    30. 

  30. 	mshflo.b r3,r3,r3
    31. 

  31. 	add r4, r22, r23
    32. 

  32. 	mperm.w r3, r63, r3	// Fill pattern now in every byte of r3
    33. 

  33. 

  34. 	movi 8, r9
    35. 

  35. 	bgtu/u r23, r9, tr0 // multiquad
    36. 

  36. 

  37. 	beqi/u r4, 0, tr2       // Return with size 0 - ensures no mem accesses
    38. 

  38. 	ldlo.q r2, 0, r7
    39. 

  39. 	shlli r4, 2, r4
    40. 

  40. 	movi -1, r8
    41. 

  41. 	SHHI r8, r4, r8
    42. 

  42. 	SHHI r8, r4, r8
    43. 

  43. 	mcmv r7, r8, r3
    44. 

  44. 	stlo.q r2, 0, r3
    45. 

  45. 	blink tr2, r63
    46. 

  46. 

  47. multiquad:
    48. 

  48. 	pta/l lastquad, tr0
    49. 

  49. 	stlo.q r2, 0, r3
    50. 

  50. 	shlri r23, 3, r24
    51. 

  51. 	add r2, r4, r5
    52. 

  52. 	beqi/u r24, 1, tr0 // lastquad
    53. 

  53. 	pta/l loop, tr1
    54. 

  54. 	sub r2, r22, r25
    55. 

  55. 	andi r5, -8, r20   // calculate end address and
    56. 

  56. 	addi r20, -7*8, r8 // loop end address; This might overflow, so we need
    57. 

  57. 	                   // to use a different test before we start the loop
    58. 

  58. 	bge/u r24, r9, tr1 // loop
    59. 

  59. 	st.q r25, 8, r3
    60. 

  60. 	st.q r20, -8, r3
    61. 

  61. 	shlri r24, 1, r24
    62. 

  62. 	beqi/u r24, 1, tr0 // lastquad
    63. 

  63. 	st.q r25, 16, r3
    64. 

  64. 	st.q r20, -16, r3
    65. 

  65. 	beqi/u r24, 2, tr0 // lastquad
    66. 

  66. 	st.q r25, 24, r3
    67. 

  67. 	st.q r20, -24, r3
    68. 

  68. lastquad:
    69. 

  69. 	sthi.q r5, -1, r3
    70. 

  70. 	blink tr2,r63
    71. 

  71. 

  72. loop:
    73. 

  73. !!!	alloco r25, 32	// QQQ comment out for short-term fix to SHUK #3895.
    74. 

  74. 			// QQQ commenting out is locically correct, but sub-optimal
    75. 

  75. 			// QQQ Sean McGoogan - 4th April 2003.
    76. 

  76. 	st.q r25, 8, r3
    77. 

  77. 	st.q r25, 16, r3
    78. 

  78. 	st.q r25, 24, r3
    79. 

  79. 	st.q r25, 32, r3
    80. 

  80. 	addi r25, 32, r25
    81. 

  81. 	bgeu/l r8, r25, tr1 // loop
    82. 

  82. 

  83. 	st.q r20, -40, r3
    84. 

  84. 	st.q r20, -32, r3
    85. 

  85. 	st.q r20, -24, r3
    86. 

  86. 	st.q r20, -16, r3
    87. 

  87. 	st.q r20, -8, r3
    88. 

  88. 	sthi.q r5, -1, r3
    89. 

  89. 	blink tr2,r63
    90. 

  90. 

  91. 	.size	memset,.-memset
    92. 

  92.