132 lines
2.1 KiB
NASM
132 lines
2.1 KiB
NASM
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; qftol -- fast floating point to long conversion.
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;
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segment .data
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temp dd 0.0
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fpucw dd 0
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; Precision Control Field , 2 bits / 0x0300
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; PC24 0x0000 Single precision (24 bits).
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; PC53 0x0200 Double precision (53 bits).
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; PC64 0x0300 Extended precision (64 bits).
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; Rounding Control Field, 2 bits / 0x0C00
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; RCN 0x0000 Rounding to nearest (even).
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; RCD 0x0400 Rounding down (directed, minus).
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; RCU 0x0800 Rounding up (directed plus).
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; RC0 0x0C00 Rounding towards zero (chop mode).
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; rounding towards nearest (even)
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cw027F dd 0x027F ; double precision
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cw037F dd 0x037F ; extended precision
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; rounding towards zero (chop mode)
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cw0E7F dd 0x0E7F ; double precision
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cw0F7F dd 0x0F7F ; extended precision
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segment .text
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;
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; int qftol( void ) - default control word
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;
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global qftol
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qftol:
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fistp dword [temp]
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mov eax, [temp]
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ret
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;
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; int qftol027F( void ) - DirectX FPU
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;
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global qftol027F
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qftol027F:
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fnstcw [fpucw]
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fldcw [cw027F]
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fistp dword [temp]
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fldcw [fpucw]
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mov eax, [temp]
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ret
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;
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; int qftol037F( void ) - Linux FPU
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;
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global qftol037F
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qftol037F:
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fnstcw [fpucw]
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fldcw [cw037F]
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fistp dword [temp]
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fldcw [fpucw]
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mov eax, [temp]
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ret
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;
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; int qftol0F7F( void ) - ANSI
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;
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global qftol0F7F
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qftol0F7F:
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fnstcw [fpucw]
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fldcw [cw0F7F]
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fistp dword [temp]
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fldcw [fpucw]
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mov eax, [temp]
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ret
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;
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; int qftol0E7F( void )
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;
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global qftol0E7F
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qftol0E7F:
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fnstcw [fpucw]
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fldcw [cw0E7F]
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fistp dword [temp]
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fldcw [fpucw]
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mov eax, [temp]
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ret
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;
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; long Q_ftol( float q )
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;
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global Q_ftol
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Q_ftol:
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fld dword [esp+4]
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fistp dword [temp]
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mov eax, [temp]
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ret
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;
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; long qftol0F7F( float q ) - Linux FPU
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;
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global Q_ftol0F7F
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Q_ftol0F7F:
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fnstcw [fpucw]
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fld dword [esp+4]
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fldcw [cw0F7F]
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fistp dword [temp]
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fldcw [fpucw]
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mov eax, [temp]
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ret
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