| 1 | ; $Id: powf.asm 96338 2022-08-19 15:07:12Z vboxsync $
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| 2 | ;; @file
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| 3 | ; IPRT - No-CRT powf - AMD64 & X86.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2006-2022 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.alldomusa.eu.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 | %define RT_ASM_WITH_SEH64
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| 29 | %include "iprt/asmdefs.mac"
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| 30 | %include "iprt/x86.mac"
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| 31 |
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| 32 |
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| 33 | BEGINCODE
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| 34 |
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| 35 | extern NAME(rtNoCrtMathPowCore)
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| 36 |
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| 37 | ;;
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| 38 | ; Compute the rfBase to the power of rfExp.
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| 39 | ; @returns st(0) / xmm0
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| 40 | ; @param rfBase [xSP + xCB*2] / xmm0
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| 41 | ; @param rfExp [xSP + xCB*2 + 4] / xmm1
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| 42 | ;
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| 43 | RT_NOCRT_BEGINPROC powf
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| 44 | push xBP
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| 45 | SEH64_PUSH_xBP
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| 46 | mov xBP, xSP
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| 47 | SEH64_SET_FRAME_xBP 0
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| 48 | push xBX
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| 49 | SEH64_PUSH_GREG rbx
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| 50 | sub xSP, 30h - xCB
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| 51 | SEH64_ALLOCATE_STACK 30h - xCB
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| 52 | SEH64_END_PROLOGUE
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| 53 |
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| 54 | ;
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| 55 | ; Load rdBase into st1 and rdExp into st0.
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| 56 | ;
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| 57 | %ifdef RT_ARCH_AMD64
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| 58 | movss [xBP - 20h], xmm0
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| 59 | fld dword [xBP - 20h]
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| 60 | fxam
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| 61 | fnstsw ax
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| 62 | mov dx, ax ; dx=fxam(base)
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| 63 |
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| 64 | movss [xBP - 30h], xmm1
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| 65 | fld dword [xBP - 30h]
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| 66 | %else
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| 67 | fld dword [xBP + xCB*2]
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| 68 | fxam
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| 69 | fnstsw ax
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| 70 | mov dx, ax ; dx=fxam(base)
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| 71 |
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| 72 | fld dword [xBP + xCB*2 + RTLRD_CB]
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| 73 | %endif
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| 74 |
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| 75 | ;
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| 76 | ; Call common worker for the calculation.
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| 77 | ;
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| 78 | mov ebx, 1 ; float
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| 79 | call NAME(rtNoCrtMathPowCore)
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| 80 |
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| 81 | ;
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| 82 | ; Normally, we return with eax==0 and we have to load the result
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| 83 | ; from st0 and into xmm0.
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| 84 | ;
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| 85 | cmp eax, 0
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| 86 | jne .return_input_reg
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| 87 |
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| 88 | fstp dword [xSP - 30h]
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| 89 | movss xmm0, [xSP - 30h]
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| 90 |
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| 91 | .return:
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| 92 | lea xSP, [xBP - xCB]
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| 93 | pop xBX
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| 94 | leave
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| 95 | ret
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| 96 |
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| 97 | ;
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| 98 | ; But sometimes, like if we have NaN or other special inputs, we should
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| 99 | ; return the input as-is and ditch the st0 value.
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| 100 | ;
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| 101 | .return_input_reg:
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| 102 | ffreep st0
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| 103 | cmp eax, 2
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| 104 | je .return_exp
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| 105 | %ifdef RT_STRICT
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| 106 | cmp eax, 1
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| 107 | je .return_base
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| 108 | int3
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| 109 | %endif
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| 110 | .return_base:
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| 111 | jmp .return
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| 112 |
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| 113 | .return_exp:
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| 114 | movss xmm0, xmm1
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| 115 | jmp .return
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| 116 | ENDPROC RT_NOCRT(powf)
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| 117 |
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