EmbeddedPkg: Extend NvVarStoreFormattedLib LIBRARY_CLASS

[mirror_edk2.git] / StdLib / LibC / CRT / Ia32 / llshl.c

/** @file\r
  64-bit Math Worker Function.\r
  The 32-bit versions of C compiler generate calls to library routines\r
  to handle 64-bit math. These functions use non-standard calling conventions.\r
\r
  Copyright (c) 2009 - 2011, Intel Corporation. All rights reserved.<BR>\r
  This program and the accompanying materials are licensed and made available\r
  under the terms and conditions of the BSD License which accompanies this\r
  distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php.\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
\r
/*\r
 * Shifts a 64-bit signed value left by a particular number of bits.\r
 */\r
__declspec(naked) void __cdecl _allshl (void)\r
{\r
  _asm {\r
    ;\r
    ; Handle shifting of 64 or more bits (return 0)\r
    ;\r
    cmp     cl, 64\r
    jae     short ReturnZero\r
\r
    ;\r
    ; Handle shifting of between 0 and 31 bits\r
    ;\r
    cmp     cl, 32\r
    jae     short More32\r
    shld    edx, eax, cl\r
    shl     eax, cl\r
    ret\r
\r
    ;\r
    ; Handle shifting of between 32 and 63 bits\r
    ;\r
More32:\r
    mov     edx, eax\r
    xor     eax, eax\r
    and     cl, 31\r
    shl     edx, cl\r
    ret\r
\r
ReturnZero:\r
    xor     eax,eax\r
    xor     edx,edx\r
    ret\r
  }\r
}\r