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memset.S

memset.S 2.0 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. #include <endian.h>
    13. 

  13. 

  14. #if __BYTE_ORDER == __LITTLE_ENDIAN
    15. 

  15. #define SHHI shlld
    16. 

  16. #define SHLO shlrd
    17. 

  17. #else
    18. 

  18. #define SHHI shlrd
    19. 

  19. #define SHLO shlld
    20. 

  20. #endif
    21. 

  21. 

  22. 	.section .text..SHmedia32,"ax"
    23. 

  23. 	.globl	memset
    24. 

  24. 	.set	memset,__memset
    25. 

  25. 	.globl	__memset
    26. 

  26. 	.hidden	__memset
    27. 

  27. 	.type	__memset, @function
    28. 

  28. 

  29. 	.align 5
    30. 

  30. 

  31. __memset:
    32. 

  32. 	pta/l multiquad, tr0
    33. 

  33. 	andi r2, 7, r22
    34. 

  34. 	ptabs r18, tr2
    35. 

  35. 	mshflo.b r3,r3,r3
    36. 

  36. 	add r4, r22, r23
    37. 

  37. 	mperm.w r3, r63, r3	// Fill pattern now in every byte of r3
    38. 

  38. 

  39. 	movi 8, r9
    40. 

  40. 	bgtu/u r23, r9, tr0 // multiquad
    41. 

  41. 

  42. 	beqi/u r4, 0, tr2       // Return with size 0 - ensures no mem accesses
    43. 

  43. 	ldlo.q r2, 0, r7
    44. 

  44. 	shlli r4, 2, r4
    45. 

  45. 	movi -1, r8
    46. 

  46. 	SHHI r8, r4, r8
    47. 

  47. 	SHHI r8, r4, r8
    48. 

  48. 	mcmv r7, r8, r3
    49. 

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

  50. 	blink tr2, r63
    51. 

  51. 

  52. multiquad:
    53. 

  53. 	pta/l lastquad, tr0
    54. 

  54. 	stlo.q r2, 0, r3
    55. 

  55. 	shlri r23, 3, r24
    56. 

  56. 	add r2, r4, r5
    57. 

  57. 	beqi/u r24, 1, tr0 // lastquad
    58. 

  58. 	pta/l loop, tr1
    59. 

  59. 	sub r2, r22, r25
    60. 

  60. 	andi r5, -8, r20   // calculate end address and
    61. 

  61. 	addi r20, -7*8, r8 // loop end address; This might overflow, so we need
    62. 

  62. 	                   // to use a different test before we start the loop
    63. 

  63. 	bge/u r24, r9, tr1 // loop
    64. 

  64. 	st.q r25, 8, r3
    65. 

  65. 	st.q r20, -8, r3
    66. 

  66. 	shlri r24, 1, r24
    67. 

  67. 	beqi/u r24, 1, tr0 // lastquad
    68. 

  68. 	st.q r25, 16, r3
    69. 

  69. 	st.q r20, -16, r3
    70. 

  70. 	beqi/u r24, 2, tr0 // lastquad
    71. 

  71. 	st.q r25, 24, r3
    72. 

  72. 	st.q r20, -24, r3
    73. 

  73. lastquad:
    74. 

  74. 	sthi.q r5, -1, r3
    75. 

  75. 	blink tr2,r63
    76. 

  76. 

  77. loop:
    78. 

  78. !!!	alloco r25, 32	// QQQ comment out for short-term fix to SHUK #3895.
    79. 

  79. 			// QQQ commenting out is locically correct, but sub-optimal
    80. 

  80. 			// QQQ Sean McGoogan - 4th April 2003.
    81. 

  81. 	st.q r25, 8, r3
    82. 

  82. 	st.q r25, 16, r3
    83. 

  83. 	st.q r25, 24, r3
    84. 

  84. 	st.q r25, 32, r3
    85. 

  85. 	addi r25, 32, r25
    86. 

  86. 	bgeu/l r8, r25, tr1 // loop
    87. 

  87. 

  88. 	st.q r20, -40, r3
    89. 

  89. 	st.q r20, -32, r3
    90. 

  90. 	st.q r20, -24, r3
    91. 

  91. 	st.q r20, -16, r3
    92. 

  92. 	st.q r20, -8, r3
    93. 

  93. 	sthi.q r5, -1, r3
    94. 

  94. 	blink tr2,r63
    95. 

  95. 

  96. 	.size	__memset,.-__memset
    97.