ArmPkg/Library/CompilerIntrinsicsLib/Arm/ldivmod.S

   1 //------------------------------------------------------------------------------
   2 //
   3 // Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
   4 //
   5 // SPDX-License-Identifier: BSD-2-Clause-Patent
   6 //
   7 //------------------------------------------------------------------------------
   8
   9 #include <AsmMacroIoLib.h>
  10
  11 //
  12 // A pair of (unsigned) long longs is returned in {{r0, r1}, {r2, r3}},
  13 //  the quotient in {r0, r1}, and the remainder in {r2, r3}.
  14 //
  15 //__value_in_regs lldiv_t
  16 //EFIAPI
  17 //__aeabi_ldivmod (
  18 //  IN UINT64  Dividen
  19 //  IN UINT64  Divisor
  20 //  )//
  21 //
  22
  23 ASM_FUNC(__aeabi_ldivmod)
  24     push     {r4,lr}
  25     asrs     r4,r1,#1
  26     eor      r4,r4,r3,LSR #1
  27     bpl      L_Test1
  28     rsbs     r0,r0,#0
  29     rsc      r1,r1,#0
  30 L_Test1:
  31     tst      r3,r3
  32     bpl      L_Test2
  33     rsbs     r2,r2,#0
  34     rsc      r3,r3,#0
  35 L_Test2:
  36     bl       ASM_PFX(__aeabi_uldivmod)
  37     tst      r4,#0x40000000
  38     beq      L_Test3
  39     rsbs     r0,r0,#0
  40     rsc      r1,r1,#0
  41 L_Test3:
  42     tst      r4,#0x80000000
  43     beq      L_Exit
  44     rsbs     r2,r2,#0
  45     rsc      r3,r3,#0
  46 L_Exit:
  47     pop      {r4,pc}
  48
  49
  50