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#ifndef SCM_TAGS_H |
#ifndef SCM_TAGS_H |
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#define SCM_TAGS_H |
#define SCM_TAGS_H |
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/* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2002 Free Software Foundation, Inc. |
/* Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003 Free Software Foundation, Inc. |
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* |
* |
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* This library is free software; you can redistribute it and/or |
* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
* modify it under the terms of the GNU Lesser General Public |
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* 0011-100 short instruction |
* 0011-100 short instruction |
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* 0100-100 short instruction |
* 0100-100 short instruction |
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* 0101-100 short instruction |
* 0101-100 short instruction |
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* 0110-100 various immediates and long instructions |
* 0110-100 short instruction |
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* 0111-100 short instruction |
* 0111-100 short instruction |
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* 1000-100 short instruction |
* 1000-100 short instruction |
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* 1001-100 short instruction |
* 1001-100 short instruction |
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* 1011-100 short instruction |
* 1011-100 short instruction |
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* 1100-100 short instruction |
* 1100-100 short instruction |
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* 1101-100 short instruction |
* 1101-100 short instruction |
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* 1110-100 immediate characters |
* 1110-100 immediate characters, various immediates and long instructions |
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* 1111-100 ilocs |
* 1111-100 ilocs |
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* |
* |
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* Some of the 0110100 immediates are long instructions (they dispatch |
* Some of the 1110100 immediates are long instructions (they dispatch in |
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* in two steps compared to one step for a short instruction). |
* three steps compared to one step for a short instruction). The three steps |
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* The two steps are, (1) dispatch on 7 bits to the long instruction |
* are, (1) dispatch on 7 bits to the long instruction handler, (2) check, if |
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* handler, (2) dispatch on 7 additional bits. |
* the immediate indicates a long instruction (rather than a character or |
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* other immediate) (3) dispatch on the additional bits. |
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* |
* |
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* One way to think of it is that there are 128 short instructions, |
* One way to think of it is that there are 128 short instructions, |
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* with the 13 immediates above being some of the most interesting. |
* with the 13 immediates above being some of the most interesting. |
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* TYP16S functions similarly wrt to TYP16 as TYP7S to TYP7, |
* TYP16S functions similarly wrt to TYP16 as TYP7S to TYP7, |
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* but a different option bit is used (bit 2 for TYP7S, |
* but a different option bit is used (bit 2 for TYP7S, |
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* bit 8 for TYP16S). |
* bit 8 for TYP16S). |
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* */ |
*/ |
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/* {Non-immediate values.} |
/* {Non-immediate values.} |
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* |
* |
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* These are used only in eval but their values |
* These are used only in eval but their values |
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* have to be allocated here. |
* have to be allocated here. |
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*/ |
*/ |
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#define SCM_IM_AND SCM_MAKSPCSYM (0) |
#define SCM_IM_AND SCM_MAKSPCSYM (0) |