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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/x86/math-emu/control_w.h
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/* SPDX-License-Identifier: GPL-2.0 */

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/*---------------------------------------------------------------------------+

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 |  control_w.h                                                              |

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 |                                                                           |

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 | Copyright (C) 1992,1993                                                   |

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 |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |

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 |                       Australia.  E-mail   [email protected]    |

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 |                                                                           |

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 +---------------------------------------------------------------------------*/

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#ifndef _CONTROLW_H_

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#define _CONTROLW_H_

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#ifdef __ASSEMBLER__

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#define	_Const_(x)	$##x

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#else

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#define	_Const_(x)	x

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#endif

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#define CW_RC		_Const_(0x0C00)	/* rounding control */

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#define CW_PC		_Const_(0x0300)	/* precision control */

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#define CW_Precision	Const_(0x0020)	/* loss of precision mask */

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#define CW_Underflow	Const_(0x0010)	/* underflow mask */

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#define CW_Overflow	Const_(0x0008)	/* overflow mask */

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#define CW_ZeroDiv	Const_(0x0004)	/* divide by zero mask */

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#define CW_Denormal	Const_(0x0002)	/* denormalized operand mask */

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#define CW_Invalid	Const_(0x0001)	/* invalid operation mask */

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#define CW_Exceptions  	_Const_(0x003f)	/* all masks */

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#define RC_RND		_Const_(0x0000)

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#define RC_DOWN		_Const_(0x0400)

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#define RC_UP		_Const_(0x0800)

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#define RC_CHOP		_Const_(0x0C00)

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/* p 15-5: Precision control bits affect only the following:

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   ADD, SUB(R), MUL, DIV(R), and SQRT */

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#define PR_24_BITS        _Const_(0x000)

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#define PR_53_BITS        _Const_(0x200)

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#define PR_64_BITS        _Const_(0x300)

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#define PR_RESERVED_BITS  _Const_(0x100)

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/* FULL_PRECISION simulates all exceptions masked */

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#define FULL_PRECISION  (PR_64_BITS | RC_RND | 0x3f)

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#endif /* _CONTROLW_H_ */

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