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alpha: Fixed function field widths (Maurice Marks)

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Maurice Marks, at VMS Software Inc, is using the Alpha instruction emulator
from SimH as a backup to an Alpha binary translator! He found a bug in the
instructions definitions: function fields, both integer and floating, are 7b not
6b.
This commit is contained in:
Bob Supnik 2017-04-17 10:10:03 -07:00 • committed by Mark Pizzolato
parent c4931bbd30
commit a719ef51e8
1 changed files with 5 additions and 3 deletions
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8
alpha/alpha_defs.h
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@ -1,6 +1,6 @@
/* alpha_defs.h: Alpha architecture definitions file
Copyright (c) 2003-2006, Robert M Supnik
Copyright (c) 2003-2017, Robert M Supnik
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
@ -26,6 +26,8 @@
Respectfully dedicated to the great people of the Alpha chip, systems, and
software development projects; and to the memory of Peter Conklin, of the
Alpha Program Office.
17-Mar-2017 RMS Fixed function field widths (Maurice Marks)
*/
#ifndef _ALPHA_DEFS_H_
@ -113,13 +115,13 @@
#define I_FSRC (I_M_FSRC << I_V_FSRC)
#define I_FSRC_X 0x0200 /* data type X */
#define I_V_FFNC 5 /* floating function */
#define I_M_FFNC 0x3F
#define I_M_FFNC 0x7F
#define I_V_LIT8 13 /* integer 8b literal */
#define I_M_LIT8 0xFF
#define I_V_ILIT 12 /* literal flag */
#define I_ILIT (1u << I_V_ILIT)
#define I_V_IFNC 5 /* integer function */
#define I_M_IFNC 0x3F
#define I_M_IFNC 0x7F
#define I_V_RC 0 /* Rc */
#define I_M_RC 0x1F
#define I_V_MDSP 0 /* memory displacement */