ref: 06eb848b99587ef882c121a5a65d2082e3b88aeb
dir: qk1/u/sys_wina.s
/* Copyright (C) 1996-1997 Id Software, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ // // sys_wina.s // x86 assembly-language Win-dependent routines. #define GLQUAKE 1 // don't include unneeded defs #include "asm_i386.h" #include "quakeasm.h" // LATER should be id386-dependent, and have an equivalent C path .data .align 4 fpenv: .long 0, 0, 0, 0, 0, 0, 0, 0 .text .globl C(MaskExceptions) C(MaskExceptions): fnstenv fpenv orl $0x3F,fpenv fldenv fpenv ret #if 0 .globl C(unmaskexceptions) C(unmaskexceptions): fnstenv fpenv andl $0xFFFFFFE0,fpenv fldenv fpenv ret #endif .data .align 4 .globl ceil_cw, single_cw, full_cw, cw, pushed_cw ceil_cw: .long 0 single_cw: .long 0 full_cw: .long 0 cw: .long 0 pushed_cw: .long 0 .text .globl C(Sys_LowFPPrecision) C(Sys_LowFPPrecision): fldcw single_cw ret .globl C(Sys_HighFPPrecision) C(Sys_HighFPPrecision): fldcw full_cw ret .globl C(Sys_PushFPCW_SetHigh) C(Sys_PushFPCW_SetHigh): fnstcw pushed_cw fldcw full_cw ret .globl C(Sys_PopFPCW) C(Sys_PopFPCW): fldcw pushed_cw ret .globl C(Sys_SetFPCW) C(Sys_SetFPCW): fnstcw cw movl cw,%eax #if id386 andb $0xF0,%ah orb $0x03,%ah // round mode, 64-bit precision #endif movl %eax,full_cw #if id386 andb $0xF0,%ah orb $0x0C,%ah // chop mode, single precision #endif movl %eax,single_cw #if id386 andb $0xF0,%ah orb $0x08,%ah // ceil mode, single precision #endif movl %eax,ceil_cw ret