55 lines
3.5 KiB
C
55 lines
3.5 KiB
C
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/****************************************************************
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* *
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* Copyright 2001, 2011 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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/*
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arit.h : defines constants for arithmetic operations.
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gdsroot.h has a definition for the MAX_NUM_SUBSC_LEN that
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depends on the number of significant digits available. If
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it changes from 18, the define must be updated
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*/
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#define NUM_DEC_DG_1L 9 /* Number of decimal digits in a int4 */
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#define NUM_DEC_DG_2L 18 /* Number of decimal digits in two longs */
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#define EXP_IDX_BIAL (9+MV_XBIAS) /* Max. biased exponent index within a int4 */
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#define EXP_IDX_BIAQ (18+MV_XBIAS) /* Max. biased exponent index within two longs */
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#define EXPLO (-42+MV_XBIAS) /* Min. biased exponent */
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#define EXPHI (48+MV_XBIAS) /* Max. biased exponent */
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/* Note: The above values for EXPLO and EXPHI set up a range of 20 thru 109 which still leaves room for expansion
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* in the 7-bit exponent whose full range is 0 thru 127. One might be tempted to increase EXPLO/EXPHI to accommodate
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* the available range but should not because these values also affect how numeric subscripts are stored in the database.
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*
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* The entire numeric range currently supported by GT.M along with how it represents them internally as well as
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* inside the database (the first byte of the numeric subscript) is captured in the table below.
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*
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* -------------------------|----------------------------------------------------------------------------------------
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* Numeric value | ... [-1E46, -1E-43] ... [0] ... [1E-43, 1E46] ...
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* mval.e representation | ... [ 109, 20] ... [0] ... [ 20, 109] ...
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* mval.sgn representation | ... [ 1, 1] ... [0] ... [ 0, 0] ...
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* | | | | | | | |
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* | | | | | | | |
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* | | | | | | | |
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* | v v v v v v v
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* subscript representation | [0x00, 0x11] [0x12, 0x6b] [0x6c,0x7F] [0x80] [0x81, 0x93] [0x94, 0xED] [0xEE, 0xFF]
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* in database |
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* -------------------------|----------------------------------------------------------------------------------------
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*
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* Any increase in EXPHI will encroach the currently unused interval [0x00,0x11] and has to be done with caution
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* as a few of those are used for different purposes (0x01 to represent a null subscript in standard null collation,
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* 0x02 to be used for spanning node subscripts etc.)
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*/
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#define EXP_INT_OVERF (7+MV_XBIAS) /* Upper bound on MV_INT numbers */
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#define EXP_INT_UNDERF (-3+MV_XBIAS) /* Lower bound on MV_INT numbers (includes
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* integers & fractions upto 3 decimal places */
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#define MANT_LO 100000000 /* mantissa.1 >= MANT_LO */
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#define MANT_HI 1000000000 /* mantissa.1 < MANT_HI , mantissa.0 < MANT_HI */
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#define INT_HI 1000000 /* -INT_HI < mv_int < INT_HI */
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