Revision: 15855
http://sourceforge.net/p/edk2/code/15855
Author: darylm503
Date: 2014-08-20 20:38:43 +0000 (Wed, 20 Aug 2014)
Log Message:
-----------
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 <[email protected]>
Reviewed-by: Erik Bjorge <[email protected]>
Modified Paths:
--------------
trunk/edk2/StdLib/LibC/LibC.inf
Added Paths:
-----------
trunk/edk2/StdLib/LibC/CRT/Ia32/llshr.c
Added: trunk/edk2/StdLib/LibC/CRT/Ia32/llshr.c
===================================================================
--- trunk/edk2/StdLib/LibC/CRT/Ia32/llshr.c (rev 0)
+++ trunk/edk2/StdLib/LibC/CRT/Ia32/llshr.c 2014-08-20 20:38:43 UTC (rev
15855)
@@ -0,0 +1,58 @@
+/** @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
+ }
+}
Modified: trunk/edk2/StdLib/LibC/LibC.inf
===================================================================
--- trunk/edk2/StdLib/LibC/LibC.inf 2014-08-20 18:02:38 UTC (rev 15854)
+++ trunk/edk2/StdLib/LibC/LibC.inf 2014-08-20 20:38:43 UTC (rev 15855)
@@ -1,7 +1,7 @@
## @file
# Standard C library: Miscelaneous implementations.
#
-# Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2010 - 2014, 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
@@ -50,6 +50,7 @@
# Compiler helper (C RunTime) functions
CRT/Ia32/llmul.c | MSFT # __allmul
CRT/Ia32/llshl.c | MSFT # __allshl
+ CRT/Ia32/llshr.c | MSFT # __allshr
CRT/Ia32/ulldiv.c | MSFT # __aulldiv
CRT/Ia32/ullrem.c | MSFT # __aullrem
CRT/Ia32/ullshr.c | MSFT # __aullshr
@@ -60,6 +61,7 @@
CRT/Ia32/llmul.c | INTEL
CRT/Ia32/llshl.c | INTEL
+ CRT/Ia32/llshr.c | INTEL
CRT/Ia32/ulldiv.c | INTEL
CRT/Ia32/ullrem.c | INTEL
CRT/Ia32/ullshr.c | INTEL
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