axpencod.h

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C头文件 代码 · 共 62 行

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*
*                            Open Watcom Project
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*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*  ========================================================================
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*    This file contains Original Code and/or Modifications of Original
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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#define _SixBits( x )   ( (x) & 0x003f )
#define _SevenBits( x ) ( (x) & 0x007f )
#define _FiveBits( x )  ( (x) & 0x001f )
#define _EightBits( x ) ( (x) & 0x00ff )
#define _ElevenBits( x )( (x) & 0x07ff )

// these correspond to letters in section 3.3 of the Alpha Architecture Manual
#define _A( x )         ( _FiveBits(x) << 21 )
#define _B( x )         ( _FiveBits(x) << 16 )
#define _C( x )         ( _FiveBits(x) << 0 )
#define _LIT( x )       ( _EightBits(x) << 13 )

#define _Opcode( x )    ( _SixBits(x) << 26 )
#define _Function( x )  ( _SevenBits(x) << 5 )
#define _FPFunction( x )( _ElevenBits(x) << 5 )

// sixteen bit signed immediate
#define _SignedImmed( x )       ( (x) & 0xffff )

typedef uint_32                 axp_ins;

#define AXP_ZERO_SINK           31
#define AXP_FLOAT_SCRATCH       30
#define AXP_RETURN_ADDR         26
#define AXP_STACK_REG           30
#define AXP_FRAME_REG           15
#define AXP_GPR_SCRATCH         28

#define AXP_MAX_OFFSET          0x7fff