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-rw-r--r--StdLib/LibC/CRT/Ia32/llshr.c58
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diff --git a/StdLib/LibC/CRT/Ia32/llshr.c b/StdLib/LibC/CRT/Ia32/llshr.c
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-/** @file
- 64-bit Math Worker Function.
- The 32-bit versions of C compiler generate calls to library routines
- to handle 64-bit math. These functions use non-standard calling conventions.
-
- Copyright (c) 2009 - 2011, Intel Corporation. All rights reserved.<BR>
- This program and the accompanying materials are licensed and made available
- under the terms and conditions of the BSD License which accompanies this
- distribution. The full text of the license may be found at
- http://opensource.org/licenses/bsd-license.php.
-
- THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
- WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
-
-**/
-
-
-/*
- * Shifts a 64-bit signed value right by a particular number of bits.
- */
-__declspec(naked) void __cdecl _allshr (void)
-{
- _asm {
- ;
- ; Handle shifts of 64 bits or more (if shifting 64 bits or more, the result
- ; depends only on the high order bit of edx).
- ;
- cmp cl,64
- jae short SIGNRETURN
-
- ;
- ; Handle shifts of between 0 and 31 bits
- ;
- cmp cl, 32
- jae short MORE32
- shrd eax,edx,cl
- sar edx,cl
- ret
-
- ;
- ; Handle shifts of between 32 and 63 bits
- ;
-MORE32:
- mov eax,edx
- sar edx,31
- and cl,31
- sar eax,cl
- ret
-
- ;
- ; Return double precision 0 or -1, depending on the sign of edx
- ;
-SIGNRETURN:
- sar edx,31
- mov eax,edx
- ret
- }
-}