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Last change
on this file since 96240 was 96167, checked in by vboxsync, 2 years ago |
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IPRT/nocrt: Simple atan, atanf, atan2 and atan2f implementations based on the FPATAN instruction (x87). bugref:10261
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Author Date Id Revision
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File size:
1.6 KB
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| 1 | ; $Id: atan2.asm 96167 2022-08-12 12:08:47Z vboxsync $
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| 2 | ;; @file
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| 3 | ; IPRT - No-CRT atan2 - AMD64 & X86.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2022 Oracle Corporation
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| 8 | ;
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| 9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | ; available from http://www.virtualbox.org. This file is free software;
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| 11 | ; you can redistribute it and/or modify it under the terms of the GNU
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| 12 | ; General Public License (GPL) as published by the Free Software
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| 13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | ;
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| 17 | ; The contents of this file may alternatively be used under the terms
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| 18 | ; of the Common Development and Distribution License Version 1.0
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| 19 | ; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | ; VirtualBox OSE distribution, in which case the provisions of the
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| 21 | ; CDDL are applicable instead of those of the GPL.
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| 22 | ;
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| 23 | ; You may elect to license modified versions of this file under the
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| 24 | ; terms and conditions of either the GPL or the CDDL or both.
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| 25 | ;
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| 26 |
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| 27 |
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| 28 | %include "iprt/asmdefs.mac"
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| 29 |
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| 30 | BEGINCODE
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| 31 |
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| 32 | ;;
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| 33 | ; Arctangent (partial).
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| 34 | ;
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| 35 | ; @returns st(0) / xmm0
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| 36 | ; @param rdY [rbp + 8] / xmm0
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| 37 | ; @param rdX [rbp + 8] / xmm0
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| 38 | RT_NOCRT_BEGINPROC atan2
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| 39 | push xBP
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| 40 | mov xBP, xSP
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| 41 |
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| 42 | %ifdef RT_ARCH_AMD64
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| 43 | sub xSP, 20h
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| 44 | movsd [xSP + 10h], xmm1
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| 45 | movsd [xSP], xmm0
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| 46 | fld qword [xSP]
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| 47 | fld qword [xSP + 10h]
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| 48 | %else
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| 49 | fld qword [xBP + xCB*2]
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| 50 | fld qword [xBP + xCB*2 + 8]
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| 51 | %endif
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| 52 |
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| 53 | fpatan
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| 54 |
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| 55 | %ifdef RT_ARCH_AMD64
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| 56 | fstp qword [xSP]
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| 57 | movsd xmm0, [xSP]
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| 58 | %endif
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| 59 | leave
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| 60 | ret
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| 61 | ENDPROC RT_NOCRT(atan2)
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| 62 |
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