ref: a63d5778cb72c91bf1b14aaa4453a0239cc4a823
dir: /u/sys_dosa.s/
// // sys_dosa.s // x86 assembly-language DOS-dependent routines. #include "asm_i386.h" #include "quakeasm.h" .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 /* .globl C(unmaskexceptions) C(unmaskexceptions): fnstenv fpenv andl $0xFFFFFFE0,fpenv fldenv fpenv ret */ .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 #ifdef id386 andb $0xF0,%ah orb $0x03,%ah // round mode, 64-bit precision #endif movl %eax,full_cw #ifdef id386 andb $0xF0,%ah orb $0x0C,%ah // chop mode, single precision #endif movl %eax,single_cw #ifdef id386 andb $0xF0,%ah orb $0x08,%ah // ceil mode, single precision #endif movl %eax,ceil_cw ret