Jaben, Erik, or Lee (or anyone else :)), Please review the attached patch. llshr.c is a new file, LibC.inf was modified.
StdLib: Add a runtime helper function for VC++ 64-bit right shift on Ia32 target architectures. Add new file StdLib/LibC/CRT/Ia32/llshr.c Add references to the new file to StdLib/LibC/LibC.inf Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Daryl McDaniel <daryl.mcdan...@intel.com<mailto:daryl.mcdan...@intel.com>> Reviewed-by: Daryl McDaniel
/** @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 left 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 } }
LibC.patch
Description: LibC.patch
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