diff options
Diffstat (limited to 'EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/Log2.S')
| -rw-r--r-- | EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/Log2.S | 156 |
1 files changed, 78 insertions, 78 deletions
diff --git a/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/Log2.S b/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/Log2.S index 2451fe6700..8a5afb1481 100644 --- a/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/Log2.S +++ b/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/Log2.S @@ -1,78 +1,78 @@ -#/*++ -# -#Copyright (c) 2006, Intel Corporation -#All rights reserved. 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. -# -#Module Name: -# -# Log2.c -# -#Abstract: -# -# 64-bit integer logarithm function for IA-32 -# -#--*/ -# -#--------------------------------------------------------------------------- -#include "EfiBind.h" //For ASM_PFX -#--------------------------------------------------------------------------- - -.globl ASM_PFX(Log2) - -#UINT8 -#Log2 ( -# IN UINT64 Operand -# ) -#/*++ -# -#Routine Description: -# -# Calculates and floors logarithms based on 2 -# -#Arguments: -# -# Operand - value to calculate logarithm -# -#Returns: -# -# The largest integer that is less than or equal -# to the logarithm of Operand based on 2 -# -#--*/ -ASM_PFX(Log2): - movl $64, %ecx - - cmpl $0, 4(%esp) # (UINT32 *(&Operand)) - jne _Log2_Wend - cmpl $0, 8(%esp) # (UINT32 *(&Operand)) + 1 - jne _Log2_Wend - movb $0xFF, %cl - jmp _Log2_Done - -_Log2_Wend: - decl %ecx - cmpl $32, %ecx - jae _Log2_Higher - btl %ecx, 4(%esp) # (UINT32 *(&Operand)) - jmp _Log2_Bit - -_Log2_Higher: - movl %ecx, %eax - subl $32, %eax - btl %eax, 8(%esp) # (UINT32 *(&Operand)) + 1 - -_Log2_Bit: - jc _Log2_Done - jmp _Log2_Wend - -_Log2_Done: - movb %cl, %al - - ret - +#/*++
+#
+#Copyright (c) 2006, Intel Corporation
+#All rights reserved. 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.
+#
+#Module Name:
+#
+# Log2.c
+#
+#Abstract:
+#
+# 64-bit integer logarithm function for IA-32
+#
+#--*/
+#
+#---------------------------------------------------------------------------
+#include "EfiBind.h" //For ASM_PFX
+#---------------------------------------------------------------------------
+
+.globl ASM_PFX(Log2)
+
+#UINT8
+#Log2 (
+# IN UINT64 Operand
+# )
+#/*++
+#
+#Routine Description:
+#
+# Calculates and floors logarithms based on 2
+#
+#Arguments:
+#
+# Operand - value to calculate logarithm
+#
+#Returns:
+#
+# The largest integer that is less than or equal
+# to the logarithm of Operand based on 2
+#
+#--*/
+ASM_PFX(Log2):
+ movl $64, %ecx
+
+ cmpl $0, 4(%esp) # (UINT32 *(&Operand))
+ jne _Log2_Wend
+ cmpl $0, 8(%esp) # (UINT32 *(&Operand)) + 1
+ jne _Log2_Wend
+ movb $0xFF, %cl
+ jmp _Log2_Done
+
+_Log2_Wend:
+ decl %ecx
+ cmpl $32, %ecx
+ jae _Log2_Higher
+ btl %ecx, 4(%esp) # (UINT32 *(&Operand))
+ jmp _Log2_Bit
+
+_Log2_Higher:
+ movl %ecx, %eax
+ subl $32, %eax
+ btl %eax, 8(%esp) # (UINT32 *(&Operand)) + 1
+
+_Log2_Bit:
+ jc _Log2_Done
+ jmp _Log2_Wend
+
+_Log2_Done:
+ movb %cl, %al
+
+ ret
+
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