diff options
Diffstat (limited to 'MdePkg/Library/BaseLib/Ia32/DivU64x64Remainder.S')
-rw-r--r-- | MdePkg/Library/BaseLib/Ia32/DivU64x64Remainder.S | 89 |
1 files changed, 0 insertions, 89 deletions
diff --git a/MdePkg/Library/BaseLib/Ia32/DivU64x64Remainder.S b/MdePkg/Library/BaseLib/Ia32/DivU64x64Remainder.S deleted file mode 100644 index f4df094195..0000000000 --- a/MdePkg/Library/BaseLib/Ia32/DivU64x64Remainder.S +++ /dev/null @@ -1,89 +0,0 @@ -#------------------------------------------------------------------------------
-#
-# Copyright (c) 2006 - 2008, 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.
-#
-# Module Name:
-#
-# DivU64x64Remainder.S
-#
-# Abstract:
-#
-# Calculate the quotient of a 64-bit integer by a 64-bit integer and returns
-# both the quotient and the remainder
-#
-#------------------------------------------------------------------------------
-
-ASM_GLOBAL ASM_PFX(InternalMathDivRemU64x32), ASM_PFX(InternalMathDivRemU64x64)
-
-#------------------------------------------------------------------------------
-# UINT64
-# EFIAPI
-# InternalMathDivRemU64x64 (
-# IN UINT64 Dividend,
-# IN UINT64 Divisor,
-# OUT UINT64 *Remainder OPTIONAL
-# );
-#------------------------------------------------------------------------------
-ASM_PFX(InternalMathDivRemU64x64):
- movl 16(%esp), %ecx # ecx <- divisor[32..63]
- testl %ecx, %ecx
- jnz Hard # call _@DivRemU64x64 if Divisor > 2^32
- movl 20(%esp), %ecx
- jecxz L1
- andl $0, 4(%ecx) # zero high dword of remainder
- movl %ecx, 16(%esp) # set up stack frame to match DivRemU64x32
-L1:
- jmp ASM_PFX(InternalMathDivRemU64x32)
-Hard:
- push %ebx
- push %esi
- push %edi
- mov 20(%esp), %edx
- mov 16(%esp), %eax # edx:eax <- dividend
- movl %edx, %edi
- movl %eax, %esi # edi:esi <- dividend
- mov 24(%esp), %ebx # ecx:ebx <- divisor
-L2:
- shrl %edx
- rcrl $1, %eax
- shrdl $1, %ecx, %ebx
- shrl %ecx
- jnz L2
- divl %ebx
- movl %eax, %ebx # ebx <- quotient
- movl 28(%esp), %ecx # ecx <- high dword of divisor
- mull 24(%esp) # edx:eax <- quotient * divisor[0..31]
- imull %ebx, %ecx # ecx <- quotient * divisor[32..63]
- addl %ecx, %edx # edx <- (quotient * divisor)[32..63]
- mov 32(%esp), %ecx # ecx <- addr for Remainder
- jc TooLarge # product > 2^64
- cmpl %edx, %edi # compare high 32 bits
- ja Correct
- jb TooLarge # product > dividend
- cmpl %eax, %esi
- jae Correct # product <= dividend
-TooLarge:
- decl %ebx # adjust quotient by -1
- jecxz Return # return if Remainder == NULL
- sub 24(%esp), %eax
- sbb 28(%esp), %edx # edx:eax <- (quotient - 1) * divisor
-Correct:
- jecxz Return
- subl %eax, %esi
- sbbl %edx, %edi # edi:esi <- remainder
- movl %esi, (%ecx)
- movl %edi, 4(%ecx)
-Return:
- movl %ebx, %eax # eax <- quotient
- xorl %edx, %edx # quotient is 32 bits long
- pop %edi
- pop %esi
- pop %ebx
- ret
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