MdePkg/Library/BaseMemoryLibOptDxe/Arm/CompareGuid.S

   1 //
   2 // Copyright (c) 2016, Linaro Limited
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   6 // modification, are permitted provided that the following conditions are met:
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   9 //     * Redistributions in binary form must reproduce the above copyright
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  14 //       derived from this software without specific prior written permission.
  15 //
  16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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  22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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  26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27 //
  28
  29     .text
  30     .thumb
  31     .syntax unified
  32     .align  5
  33 ASM_GLOBAL ASM_PFX(InternalMemCompareGuid)
  34 ASM_PFX(InternalMemCompareGuid):
  35     push    {r4, lr}
  36     ldr     r2, [r0]
  37     ldr     r3, [r0, #4]
  38     ldr     r4, [r0, #8]
  39     ldr     r0, [r0, #12]
  40     cbz     r1, 1f
  41     ldr     ip, [r1]
  42     ldr     lr, [r1, #4]
  43     cmp     r2, ip
  44     it      eq
  45     cmpeq.n r3, lr
  46     beq     0f
  47     movs    r0, #0
  48     pop     {r4, pc}
  49
  50 0:  ldr     r2, [r1, #8]
  51     ldr     r3, [r1, #12]
  52     cmp     r4, r2
  53     it      eq
  54     cmpeq.n r0, r3
  55     bne     2f
  56     movs    r0, #1
  57     pop     {r4, pc}
  58
  59 1:  orrs    r2, r2, r3
  60     orrs    r4, r4, r0
  61     movs    r0, #1
  62     orrs    r2, r2, r4
  63 2:  it      ne
  64     movne.n r0, #0
  65     pop     {r4, pc}