|
Last change
on this file since 2919 was 1, checked in by vboxsync, 55 years ago |
|
import
|
-
Property svn:keywords
set to
Id
|
|
File size:
1.7 KB
|
| Line | |
|---|
| 1 | ; $Id: trunc.asm 1 1970-01-01 00:00:00Z vboxsync $
|
|---|
| 2 | ;; @file
|
|---|
| 3 | ; InnoTek Portable Runtime - No-CRT trunc - AMD64 & X86.
|
|---|
| 4 | ;
|
|---|
| 5 |
|
|---|
| 6 | ;
|
|---|
| 7 | ; Copyright (C) 2006 InnoTek Systemberatung GmbH
|
|---|
| 8 | ;
|
|---|
| 9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 10 | ; available from http://www.virtualbox.org. This file is free software;
|
|---|
| 11 | ; you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 12 | ; General Public License as published by the Free Software Foundation,
|
|---|
| 13 | ; in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
|
|---|
| 14 | ; distribution. VirtualBox OSE is distributed in the hope that it will
|
|---|
| 15 | ; be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 16 | ;
|
|---|
| 17 | ; If you received this file as part of a commercial VirtualBox
|
|---|
| 18 | ; distribution, then only the terms of your commercial VirtualBox
|
|---|
| 19 | ; license agreement apply instead of the previous paragraph.
|
|---|
| 20 | ;
|
|---|
| 21 |
|
|---|
| 22 |
|
|---|
| 23 | %include "iprt/asmdefs.mac"
|
|---|
| 24 |
|
|---|
| 25 | BEGINCODE
|
|---|
| 26 |
|
|---|
| 27 | %ifdef __AMD64__
|
|---|
| 28 | %define _SP rsp
|
|---|
| 29 | %define _BP rbp
|
|---|
| 30 | %define _S 8
|
|---|
| 31 | %else
|
|---|
| 32 | %define _SP esp
|
|---|
| 33 | %define _BP ebp
|
|---|
| 34 | %define _S 4
|
|---|
| 35 | %endif
|
|---|
| 36 |
|
|---|
| 37 | ;;
|
|---|
| 38 | ; Round to truncated integer value.
|
|---|
| 39 | ; @returns 32-bit: st(0) 64-bit: xmm0
|
|---|
| 40 | ; @param rd 32-bit: [ebp + 8] 64-bit: xmm0
|
|---|
| 41 | BEGINPROC RT_NOCRT(trunc)
|
|---|
| 42 | push _BP
|
|---|
| 43 | mov _BP, _SP
|
|---|
| 44 | sub _SP, 10h
|
|---|
| 45 |
|
|---|
| 46 | %ifdef __AMD64__
|
|---|
| 47 | movsd [_SP], xmm0
|
|---|
| 48 | fld qword [_SP]
|
|---|
| 49 | %else
|
|---|
| 50 | fld qword [_BP + _S*2]
|
|---|
| 51 | %endif
|
|---|
| 52 |
|
|---|
| 53 | ; Make it truncate up by modifying the fpu control word.
|
|---|
| 54 | fstcw [_BP - 10h]
|
|---|
| 55 | mov eax, [_BP - 10h]
|
|---|
| 56 | or eax, 00c00h
|
|---|
| 57 | mov [_BP - 08h], eax
|
|---|
| 58 | fldcw [_BP - 08h]
|
|---|
| 59 |
|
|---|
| 60 | ; Round ST(0) to integer.
|
|---|
| 61 | frndint
|
|---|
| 62 |
|
|---|
| 63 | ; Restore the fpu control word.
|
|---|
| 64 | fldcw [_BP - 10h]
|
|---|
| 65 |
|
|---|
| 66 | %ifdef __AMD64__
|
|---|
| 67 | fstp qword [_SP]
|
|---|
| 68 | movsd xmm0, [_SP]
|
|---|
| 69 | %endif
|
|---|
| 70 | leave
|
|---|
| 71 | ret
|
|---|
| 72 | ENDPROC RT_NOCRT(trunc)
|
|---|
| 73 |
|
|---|
Note:
See
TracBrowser
for help on using the repository browser.
