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>
110 lines
3.0 KiB
Plaintext
110 lines
3.0 KiB
Plaintext
/*------------------------------------------------------------------------
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* filename - coshl.cas
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*
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* function(s)
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* coshl - long double hyperbolic cosine 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 coshl - long double hyperbolic function
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Usage long double coshl(long double x);
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Prototype in math.h
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Description coshl computes the hyperbolic cosine of the input value.
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Return value coshl returns the hyperbolic cosine 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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e
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*---------------------------------------------------------------------------*/
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long double _FARFUNC coshl (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 and ax, x [8] /* select exponent */
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asm FLD LONGDOUBLE (x)
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asm cmp ax, 3fffh+13
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asm jae coshl_tooBig /* exp (+-2^13) considered too large */
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asm cmp ax, 3fffh-13
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asm jb coshl_tiny
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coshl_justFits:
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__expld(); /* TOS = expl(x) */
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asm FLD1
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asm FDIV st, st(1) /* TOS = expl (-x) = 1 / expl(x) */
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asm FADDP st(1), st /* TOS = expl(x) + expl(-x) */
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asm FSCALE /* coshl (x) = (expl(x) + expl(-x)) / 2 */
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asm FSTP st(1)
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coshl_end:
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#pragma noretval
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return;
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coshl_tooBig:
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asm mov ax, 0FFFFh /* force extreme */
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asm ja coshl_excess
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asm mov ax, x [6]
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coshl_excess:
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asm test BY0 (x [9]), 80h
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asm jnz coshl_tooTiny
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asm cmp ax, 0B172h
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asm jb coshl_justFits
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asm mov si, OVERFLOW
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asm jmp short coshl_err
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coshl_tooTiny:
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asm cmp ax, 0B16Ch
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asm jb coshl_justFits
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asm mov si, UNDERFLOW
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coshl_err:
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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 (_SI, "coshl", &x, NULL,
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(UNDERFLOW == _SI) ? 0.0 : _LHUGE_VAL);
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#pragma warn .ret
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/*
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coshl is more accurately calculated by the polynomial
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(1 + x^2/2)
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when x is tiny (|x| < 2^-13).
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*/
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coshl_tiny:
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asm FMUL ST(0), ST(0)
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asm FSCALE /* divide by 2 */
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asm FSUBRP ST(1), ST(0) /* +1 == - (-1) */
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asm jmp short coshl_end
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#pragma warn -rvl
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}
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#pragma warn .rvl
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