CydandClaude Fable 5
63312e07f9
- BORLAND/: Borland C++ 4.52 (chosen over 4.5 by byte-match: CODE/RP/CW32.LIB
is identical to 4.52's install lib). BCC32/TLINK32/TLIB/MAKE run natively on
Win11; CODE/BT/OPT.MAK is the shipped BTL4OPT.EXE's exact flag recipe
(extender = Borland PowerPack DPMI32, not Phar Lap TNT).
- restoration/source410/: the literal 1995-form reconstruction of the missing
BT game source (never mixed into CODE/). Round 1-3 state:
* 6 of 10 surviving original TUs COMPILE CLEAN under the period toolchain
(BTMSSN, BTCNSL, BTSCNRL, BTTEAM, BTL4MODE, BTL4ARND) - first builds
since 1996.
* BT_L4/BTL4APP.CPP pilot reconstruction: 12/12 functions, Fail() lands on
its binary-recorded line 400 exactly.
* BT/BTCNSL.HPP: console wire IDs recovered from the binary's ctors
(Killed=9, Damaged=10, ScoreUpdate=13, DeathWithoutHonor=15 [T1];
TeamScore=12 flagged [T4]).
* MUNGA/: 8 engine-header backfills back-dated from the BT412 WinTesla tree
(VDATA numbering decomp-verified; AUDREND's OpenAL-era virtual removed -
the period compiler is the drift detector).
* Tooling: backdate.py (WinTesla->1995 header transform), compile410.sh
(per-TU verification sweep under authentic OPT.MAK flags).
* README: corrected roadmap - MECH.HPP is the capstone grown with the mech
TU reconstructions; BTREG.CPP green = the header-family milestone.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
135 lines
3.6 KiB
Plaintext
135 lines
3.6 KiB
Plaintext
/*------------------------------------------------------------------------
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* filename - sinhl.cas
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*
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* function(s)
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* sinhl - long double hyperbolic sine function
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*-----------------------------------------------------------------------*/
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/*
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* C/C++ Run Time Library - Version 6.5
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*
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* Copyright (c) 1987, 1994 by Borland International
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* All Rights Reserved.
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*
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*/
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#pragma inline
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#include <asmrules.h>
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#include <_math.h>
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#include <math.h>
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#include <errno.h>
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#include <stddef.h>
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/*--------------------------------------------------------------------------*
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Name sinhl - long double hyperbolic sine function
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Usage long double sinhl(long double x);
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Prototype in math.h
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Description sinhl computes the hyperbolic sine of the input value.
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Return value sinhl returns the hyperbolic sine of the input value.
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For large arguments (absolute value greater than
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~11356.5) the result will be _LHUGE_VAL of
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the appropriate sign and errno will be set to:
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ERANGE Range error.
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*---------------------------------------------------------------------------*/
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/*
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Algorithm.
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The usual formula is:
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sinhl(x) = .5*(expl(x) - expl(-x))
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but there is a loss of precision in using this formula directly near 0.
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Since sinhl(-x) = -sinhl(x), compute sinhl(|x|) and adjust the sign later.
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If 0 <= x < 2^-33, return x.
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If x >= 11356.5 call matherr.
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If x >= .3465, use
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y = expl(x)
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sinhl(x) = (y - 1/y)/2
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If 2^-33 <= x < .3465, use
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y = expl(x) - 1
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sinhl(x) = (y + y/(1 + y))/2
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where special chip functions are used to get expl(x)-1 accurately.
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*/
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long double _FARFUNC sinhl (long double x)
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{
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asm FLD1
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asm mov ax, 7FFFh
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asm FCHS /* TOS = -1.0, used in FSCALE later */
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asm mov dx, x [8]
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asm and ax, dx /* select exponent */
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asm FLD LONGDOUBLE (x)
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asm cmp ax, 3fffh+13 /* 2^13 is the near the limit */
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asm jae sinhl_tooBig
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asm FABS
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asm cmp ax, 3FFDh /* compare with .3465 */
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asm jb jb_sinhl_small /* avoid "jmp out of range" error */
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asm ja sinhl_justFits
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asm cmp W0 (x [6]), 0B168h
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jb_sinhl_small:
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asm jb sinhl_small
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sinhl_justFits:
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__expld(); /* TOS = expl(x) */
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asm FLD1
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asm FDIV st, st(1) /* Exp (-x) */
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asm FSUBP st(1), st
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asm FSCALE /* sinhl (x) = (exp(x) - exp(-x)) / 2 */
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sinhl_end:
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asm FSTP st(1) /* discard the -1 */
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/* change sign if original argument was negative */
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asm or dh, dh
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asm jns sinhl_end2
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asm FCHS
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sinhl_end2:
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#pragma noretval
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return;
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sinhl_tooBig:
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asm ja sinhl_over
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asm cmp W0 (x [6]), 0B172h
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asm jb sinhl_justFits
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sinhl_over:
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asm FSTP ST(0) /* pop two items off the stack */
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asm FSTP ST(0)
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#pragma warn -ret
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return __matherrl (OVERFLOW, "sinhl", &x, NULL,
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(_DX & 0x8000) ? - _LHUGE_VAL : _LHUGE_VAL);
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#pragma warn .ret
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sinhl_small:
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asm cmp ax, 3fffh-33 /* x < 2^-33 ? */
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asm jb sinhl_end /* x tiny, return x */
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asm FLDL2E
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asm FMUL
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asm F2XM1
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/* TOS = y = exp(x) - 1 */
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asm FLD1
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asm FADD st(0),st(1)
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/* stack = 1+y,y,-1 */
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asm FDIVR st(0),st(1)
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asm FADD
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asm FSCALE
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goto sinhl_end;
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}
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