ppcenc.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 67 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 _TenBits( x )   ( (x) & 0x03ff )
#define _OneBit( x )    ( (x) & 0x0001 )

// these correspond to letters in section 3.3 of the Alpha Architecture Manual
#define _A( x )         ( _FiveBits(x) << 16 )
#define _B( x )         ( _FiveBits(x) << 11 )
#define _C( x )         ( _FiveBits(x) <<  6 )
#define _S( x )         ( _FiveBits(x) << 21 )
#define _D( x )         ( _FiveBits(x) << 21 )

#define _Op1( x )       ( _SixBits(x) << 26 )
#define _Op2( x )       ( _TenBits(x) << 1 )

// Note: this assumes SPR[5-9] is 0 (so we can put simple decimal value as parm)
#define _SPR( x )       ( _TenBits( x ) << 16 )

#define _AA( x )        ( _OneBit( x ) << 1 )
#define _LK( x )        ( _OneBit( x ) )

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

// twenty-four bit signed immediate (note - this effectively divides by 4)
#define _BranchImmed( x )       ( (x) & 0x3fffffc )

// SPR registers (page 10-131)
#define SPR_LR          8
#define SPR_CTR         9

typedef uint_32                 ppc_ins;