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memset.S

memset.S 1.9 KB
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  1. /* SPDX-License-Identifier: GPL-2.0 */
    2. 

  2. /* Cloned and hacked for uClibc by Paul Mundt, December 2003 */
    3. 

  3. /* Modified by SuperH, Inc. September 2003 */
    4. 

  4. !
    5. 

  5. ! Fast SH memset
    6. 

  6. !
    7. 

  7. ! by Toshiyasu Morita (tm@netcom.com)
    8. 

  8. !
    9. 

  9. ! SH5 code by J"orn Rennecke (joern.rennecke@superh.com)
    10. 

  10. ! Copyright 2002 SuperH Ltd.
    11. 

  11. !
    12. 

  12. 

  13. #if __BYTE_ORDER == __LITTLE_ENDIAN
    14. 

  14. #define SHHI shlld
    15. 

  15. #define SHLO shlrd
    16. 

  16. #else
    17. 

  17. #define SHHI shlrd
    18. 

  18. #define SHLO shlld
    19. 

  19. #endif
    20. 

  20. 

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

  22. 	.globl	memset
    23. 

  23. 	.type	memset, @function
    24. 

  24. 

  25. 	.align 5
    26. 

  26. 

  27. memset:
    28. 

  28. 	pta/l multiquad, tr0
    29. 

  29. 	andi r2, 7, r22
    30. 

  30. 	ptabs r18, tr2
    31. 

  31. 	mshflo.b r3,r3,r3
    32. 

  32. 	add r4, r22, r23
    33. 

  33. 	mperm.w r3, r63, r3	// Fill pattern now in every byte of r3
    34. 

  34. 

  35. 	movi 8, r9
    36. 

  36. 	bgtu/u r23, r9, tr0 // multiquad
    37. 

  37. 

  38. 	beqi/u r4, 0, tr2       // Return with size 0 - ensures no mem accesses
    39. 

  39. 	ldlo.q r2, 0, r7
    40. 

  40. 	shlli r4, 2, r4
    41. 

  41. 	movi -1, r8
    42. 

  42. 	SHHI r8, r4, r8
    43. 

  43. 	SHHI r8, r4, r8
    44. 

  44. 	mcmv r7, r8, r3
    45. 

  45. 	stlo.q r2, 0, r3
    46. 

  46. 	blink tr2, r63
    47. 

  47. 

  48. multiquad:
    49. 

  49. 	pta/l lastquad, tr0
    50. 

  50. 	stlo.q r2, 0, r3
    51. 

  51. 	shlri r23, 3, r24
    52. 

  52. 	add r2, r4, r5
    53. 

  53. 	beqi/u r24, 1, tr0 // lastquad
    54. 

  54. 	pta/l loop, tr1
    55. 

  55. 	sub r2, r22, r25
    56. 

  56. 	andi r5, -8, r20   // calculate end address and
    57. 

  57. 	addi r20, -7*8, r8 // loop end address; This might overflow, so we need
    58. 

  58. 	                   // to use a different test before we start the loop
    59. 

  59. 	bge/u r24, r9, tr1 // loop
    60. 

  60. 	st.q r25, 8, r3
    61. 

  61. 	st.q r20, -8, r3
    62. 

  62. 	shlri r24, 1, r24
    63. 

  63. 	beqi/u r24, 1, tr0 // lastquad
    64. 

  64. 	st.q r25, 16, r3
    65. 

  65. 	st.q r20, -16, r3
    66. 

  66. 	beqi/u r24, 2, tr0 // lastquad
    67. 

  67. 	st.q r25, 24, r3
    68. 

  68. 	st.q r20, -24, r3
    69. 

  69. lastquad:
    70. 

  70. 	sthi.q r5, -1, r3
    71. 

  71. 	blink tr2,r63
    72. 

  72. 

  73. loop:
    74. 

  74. !!!	alloco r25, 32	// QQQ comment out for short-term fix to SHUK #3895.
    75. 

  75. 			// QQQ commenting out is locically correct, but sub-optimal
    76. 

  76. 			// QQQ Sean McGoogan - 4th April 2003.
    77. 

  77. 	st.q r25, 8, r3
    78. 

  78. 	st.q r25, 16, r3
    79. 

  79. 	st.q r25, 24, r3
    80. 

  80. 	st.q r25, 32, r3
    81. 

  81. 	addi r25, 32, r25
    82. 

  82. 	bgeu/l r8, r25, tr1 // loop
    83. 

  83. 

  84. 	st.q r20, -40, r3
    85. 

  85. 	st.q r20, -32, r3
    86. 

  86. 	st.q r20, -24, r3
    87. 

  87. 	st.q r20, -16, r3
    88. 

  88. 	st.q r20, -8, r3
    89. 

  89. 	sthi.q r5, -1, r3
    90. 

  90. 	blink tr2,r63
    91. 

  91. 

  92. 	.size	memset,.-memset
    93.