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ipxe/src/arch/e1/core/strcmp.S

strcmp.S 2.1KB
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  1. /*

  2.  * Derived from the Hyperstone's library source code.

  3.  * Modefied src in order to apply the -mgnu-param compiler option.

  4.  * Copyright (C) 2002-2003 GDT, Yannis Mitsos <gmitsos@telecom.ntua.gr>

  5.  *                              George Thanos <gthanos@telecom.ntua.gr>

  6.  */

  7.         .text

  8. 	    .align   2

  9. 	    .global  _strcmp

  10. ;ENTRY(_strcmp)

  11. _strcmp:

  12. 	    FRAME    L8,L2

  13. 	    CMPBI    L1, 3        # check for word alignment

  14. 	    BNZ      str_except

  15. 	    CMPBI    L0, 3        # check for word alignment

  16. 	    BNZ      str_except

  17. 

  18. start:

  19. 	    LDD.P    L1, L4       # post inc mode

  20. 	    LDD.P    L0, L6       # post inc mode

  21.             CMPBI    L4, ANYBZ

  22.             BE       correct1

  23.             CMP      L4, L6

  24.             BNE      correct1

  25.             CMP      L5, L7

  26.             BNE      correct

  27.             CMPBI    L5, ANYBZ

  28.             BE       correct

  29.             CMPBI    L6, ANYBZ

  30.             BE       correct1

  31.             CMPBI    L7, ANYBZ

  32.             BNE      start

  33. 

  34. correct:    MASK     L4, L5, 0xff000000

  35. 	    MASK     L6, L7, 0xff000000

  36.             CMP      L4, L6

  37.             BNE      Exit

  38.             SHLI     L5, 8

  39.             CMPI     L4, 0

  40.             DBNE     correct

  41.             SHLI     L7, 8

  42.             MOV      L1, L4

  43.             RET      PC, L2

  44. 

  45. Exit:       SUB      L4, L6       # Subtract chars

  46.             SARI     L4, 24

  47.             MOV      L1, L4

  48.             RET      PC, L2

  49. 

  50. correct1:   MASK     L5, L4, 0xff000000

  51. 	    MASK     L7, L6, 0xff000000

  52.             CMP      L5, L7

  53.             BNE      Exit1

  54.             SHLI     L4, 8

  55.             CMPI     L5, 0

  56.             DBNE     correct1

  57.             SHLI     L6, 8

  58.             MOV      L1, L5

  59.             RET      PC, L2

  60. Exit1:      SUB      L5, L7       # Subtract chars

  61.             SARI     L5, 24

  62.             MOV      L1, L5

  63.             RET      PC, L2

  64. 

  65. testzero:   CMPI     L4, 0

  66.             BE       L_5

  67. str_except:

  68. 	    LDBU.N   L1, L4, 1    # Load *s1, compare bytes

  69. 	    LDBU.N   L0, L5, 1    # Load *s2, compare bytes

  70.             CMP      L4, L5

  71. 	    BE       testzero

  72. 	    SUB      L4, L5       # Subtract chars

  73. L_5:        MOV      L1, L4

  74. 	    RET      PC, L2

  75. 	    .END