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>
124 lines
4.4 KiB
Plaintext
124 lines
4.4 KiB
Plaintext
/*------------------------------------------------------------------------
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* filename - expld.cas
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*
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* function(s)
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* expld - long double exponential function helper 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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static unsigned short log2hi[5] =
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{ 0x0000,0xD1D0,0x17F7,0xB172,0x3FFE }; /* +0.693E+0 */
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static unsigned short log2hi_ov_2[5] =
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{ 0x0000,0xD1D0,0x17F7,0xB172,0x3FFD }; /* +0.34657E+0 */
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static unsigned short log2lo[5] =
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{ 0xFC0D,0x4C67,0x361C,0x8654,0xBFCE }; /* -0.1864E-14 */
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/*--------------------------------------------------------------------------*
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Name __expld - long double exponential function
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Usage void near __expld(void)
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Prototype in _math.h
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Description expl calculates the exponent of the argument on the top
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of the FPU stack (e^TOS). The result is left on the
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top of the FPU stack. No error checking on the argument
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is performed. This function is a helper for expl(), sinh(),
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and coshl().
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Return value __expld does not return a value, but leaves the result
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e^TOS on the TOS.
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*---------------------------------------------------------------------------*/
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void pascal near __expld(void)
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{
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// OK, I know this looks strange. status is initialized in the huge
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// model to force the compiler to load DS. I already tried _loadds
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// but not even that works since the compiler is trying to be smart
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// here and avoid loading DS because it doesn't see any need for it.
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#ifdef __HUGE__
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unsigned short status = log2hi[0];
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#else
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unsigned short status;
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#endif
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asm FLD LONGDOUBLE (log2hi) /* st(0)= log2hi st(1)= x */
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asm FLD st(1) /* st(0)= x; st(1)= log2hi; st(2)= x */
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asm FPREM /* st(0)=hi; st(1)=log2hi; st(2)=x */
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asm FLD LONGDOUBLE (log2hi_ov_2) /* st(0)=log2hi/2 */
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asm FCOMP st(1) /* log2hi/2 >= hi ? */
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asm FSTSW status
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asm FWAIT
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asm mov ah, status[1]
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asm sahf
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asm jae expl_test_neg
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asm FSUB st(0), st(1) /* st(0)= hi; st(1)= log2hi; st(2)= x */
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asm jmp short expl_begin
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expl_test_neg:
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asm FLD LONGDOUBLE (log2hi_ov_2) /* st(0)=-log2hi/2 */
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asm FCHS
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asm FCOMP st(1) /* -log2hi/2 <= hi ? */
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asm FSTSW status
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asm FWAIT
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asm mov ah, status[1]
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asm sahf
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asm jbe expl_begin
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asm FADD st(0), st(1) /* st(0)=hi; st(1)=log2hi; st(2)=x */
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expl_begin:
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asm FXCH st(2) /* st(0)= x; st(1)= log2hi; st(2)= hi */
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asm FSUB st(0), st(2) /* st(0)= x-hi; st(1)= log2hi; st(2)= hi */
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asm FDIVRP st(1), st(0) /* st(0)= (x-hi)/log2hi; st(1)= hi */
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asm FRNDINT /* st(0)= i= rint((x-hi)/log2hi); st(1)= hi */
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asm FXCH st(1) /* st(0)= hi; st(1)= i */
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asm FLD LONGDOUBLE (log2lo) /* st(0)=log2lo; st(1)=hi; st(2)=i */
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asm FMUL st(0), st(2) /* st(0)= i*log2lo; st(1)= hi; st(2)= i */
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asm FSUBP st(1), st(0) /* st(0)= r= x-i*log2; st(1)= i */
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asm FLDL2E /* st(0)= log2(e); st(1)= r; st(2)= i */
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asm FMUL /* st(0)= f; st(1)= i */
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asm FTST /* f >= 0? */
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asm FSTSW status
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asm FWAIT
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asm mov ah, status[1]
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asm sahf
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asm jb expl_red_neg
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asm F2XM1 /* st(0)= 2^f-1; st(1)= i */
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asm FLD1 /* st(0)= 1; st(1)= 2^f-1; st(2)= i */
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asm FADDP st(1), st(0) /* st(0)= 2^f; st(1)= i */
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asm jmp short expl_red_next
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expl_red_neg:
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asm FCHS /* st(0)= -f; st(1)= i */
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asm F2XM1 /* st(0)= 2^(-f)-1; st(1)= i */
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asm FLD1 /* st(0)= 1; st(1)= 2^(-f)-1; st(2)= i */
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asm FADD st(1), st(0) /* st(0)= 1; st(1)= 2^(-f); st(2)= i */
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asm FDIVRP st(1), st(0) /* st(0)= 2^f; st(1)= i */
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expl_red_next:
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asm FSCALE /* st(0)= (2^i)*(2^f) */
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asm FSTP st(1)
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return;
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}
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