CryptoPkg/Library/IntrinsicLib/Ia32/MathLShiftS64.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
   4 ; This program and the accompanying materials
   5 ; are licensed and made available under the terms and conditions of the BSD License
   6 ; which accompanies this distribution.  The full text of the license may be found at
   7 ; http://opensource.org/licenses/bsd-license.php.
   8 ;
   9 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11 ;
  12 ; Module Name:
  13 ;
  14 ;   MathLShiftS64.nasm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   64-bit Math Worker Function.
  19 ;   Shifts a 64-bit signed value left by a certain number of bits.
  20 ;
  21 ;------------------------------------------------------------------------------
  22
  23     SECTION .text
  24
  25 global ASM_PFX(__ashldi3)
  26 ;------------------------------------------------------------------------------
  27 ;
  28 ; void __cdecl __ashldi3 (void)
  29 ;
  30 ;------------------------------------------------------------------------------
  31 ASM_PFX(__ashldi3):
  32     cmp cl,0x40
  33     jnc ReturnZero
  34     cmp cl,0x20
  35     jnc More32
  36     shld edx,eax,cl
  37     shl eax,cl
  38     ret
  39 More32:
  40     mov edx,eax
  41     xor eax,eax
  42     and cl,0x1f
  43     shl edx,cl
  44     ret
  45 ReturnZero:
  46     xor eax,eax
  47     xor edx,edx
  48     ret