CryptoPkg/Library/IntrinsicLib/Ia32/MathLShiftS64.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
   4 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   5 ;
   6 ; Module Name:
   7 ;
   8 ;   MathLShiftS64.nasm
   9 ;
  10 ; Abstract:
  11 ;
  12 ;   64-bit Math Worker Function.
  13 ;   Shifts a 64-bit signed value left by a certain number of bits.
  14 ;
  15 ;------------------------------------------------------------------------------
  16
  17     SECTION .text
  18
  19 global ASM_PFX(__ashldi3)
  20 ;------------------------------------------------------------------------------
  21 ;
  22 ; void __cdecl __ashldi3 (void)
  23 ;
  24 ;------------------------------------------------------------------------------
  25 ASM_PFX(__ashldi3):
  26     cmp cl,0x40
  27     jnc ReturnZero
  28     cmp cl,0x20
  29     jnc More32
  30     shld edx,eax,cl
  31     shl eax,cl
  32     ret
  33 More32:
  34     mov edx,eax
  35     xor eax,eax
  36     and cl,0x1f
  37     shl edx,cl
  38     ret
  39 ReturnZero:
  40     xor eax,eax
  41     xor edx,edx
  42     ret