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03201aff22
- Clean up ftol()/snapvector() mess - Make use of SSE instructions for ftol()/snapvector() if available - move ftol/snapvector pure assembler to inline assembler, this will add x86_64 and improve support for different calling conventions - Set FPU control word at program startup to get consistent behaviour on all platforms
90 lines
2.1 KiB
NASM
90 lines
2.1 KiB
NASM
; ===========================================================================
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; Copyright (C) 2011 Thilo Schulz <thilo@tjps.eu>
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;
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; This file is part of Quake III Arena source code.
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;
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; Quake III Arena source code is free software; you can redistribute it
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; and/or modify it under the terms of the GNU General Public License as
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; published by the Free Software Foundation; either version 2 of the License,
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; or (at your option) any later version.
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;
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; Quake III Arena source code is distributed in the hope that it will be
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; useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with Quake III Arena source code; if not, write to the Free Software
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; Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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; ===========================================================================
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; MASM ftol conversion functions using SSE or FPU
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; assume __cdecl calling convention is being used for x86, __fastcall for x64
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IFNDEF idx64
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.model flat, c
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ENDIF
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; .data
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; ifndef idx64
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; fpucw WORD 0F7Fh
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; endif
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.code
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IFDEF idx64
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; qftol using SSE
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qftolsse PROC
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cvttss2si eax, xmm0
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ret
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qftolsse ENDP
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qvmftolsse PROC
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movss xmm0, dword ptr [rdi + rbx * 4]
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cvttss2si eax, xmm0
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ret
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qvmftolsse ENDP
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ELSE
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; qftol using FPU
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qftolx87m macro src
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; not necessary, fpucw is set with _controlfp at startup
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; sub esp, 2
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; fnstcw word ptr [esp]
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; fldcw fpucw
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fld dword ptr src
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fistp dword ptr src
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; fldcw [esp]
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mov eax, src
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; add esp, 2
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ret
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endm
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qftolx87 PROC
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; need this line when storing FPU control word on stack
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; qftolx87m [esp + 6]
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qftolx87m [esp + 4]
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qftolx87 ENDP
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qvmftolx87 PROC
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qftolx87m [edi + ebx * 4]
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qvmftolx87 ENDP
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; qftol using SSE
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qftolsse PROC
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movss xmm0, dword ptr [esp + 4]
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cvttss2si eax, xmm0
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ret
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qftolsse ENDP
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qvmftolsse PROC
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movss xmm0, dword ptr [edi + ebx * 4]
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cvttss2si eax, xmm0
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ret
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qvmftolsse ENDP
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ENDIF
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end
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