MdePkg/Library/BaseLib/Ia32/LRotU64.S

   1 #------------------------------------------------------------------------------
   2 #
   3 # Copyright (c) 2006 - 2015, 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 #   LRotU64.S
  15 #
  16 # Abstract:
  17 #
  18 #   64-bit left rotation for Ia32
  19 #
  20 #------------------------------------------------------------------------------
  21
  22 ASM_GLOBAL ASM_PFX(InternalMathLRotU64)
  23
  24 #------------------------------------------------------------------------------
  25 # UINT64
  26 # EFIAPI
  27 # InternalMathLRotU64 (
  28 #   IN      UINT64                    Operand,
  29 #   IN      UINTN                     Count
  30 #   );
  31 #------------------------------------------------------------------------------
  32 ASM_PFX(InternalMathLRotU64):
  33     push    %ebx
  34     movb    16(%esp), %cl
  35     movl    12(%esp), %edx
  36     movl    8(%esp), %eax
  37     shldl   %cl, %edx, %ebx
  38     shldl   %cl, %eax, %edx
  39     rorl    %cl, %ebx
  40     shldl   %cl, %ebx, %eax
  41     testb   $32, %cl                    # Count >= 32?
  42     jz      L0
  43     movl    %eax, %ecx
  44     movl    %edx, %eax
  45     movl    %ecx, %edx
  46 L0:
  47     pop     %ebx
  48     ret