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Diffstat (limited to 'c/src/lib/libcpu/m68k/m68040/fpsp/scosh.S')
| -rw-r--r-- | c/src/lib/libcpu/m68k/m68040/fpsp/scosh.S | 134 |
1 files changed, 0 insertions, 134 deletions
diff --git a/c/src/lib/libcpu/m68k/m68040/fpsp/scosh.S b/c/src/lib/libcpu/m68k/m68040/fpsp/scosh.S deleted file mode 100644 index 1153ef0b7b..0000000000 --- a/c/src/lib/libcpu/m68k/m68040/fpsp/scosh.S +++ /dev/null @@ -1,134 +0,0 @@ -#include "fpsp-namespace.h" -// -// -// scosh.sa 3.1 12/10/90 -// -// The entry point sCosh computes the hyperbolic cosine of -// an input argument; sCoshd does the same except for denormalized -// input. -// -// Input: Double-extended number X in location pointed to -// by address register a0. -// -// Output: The value cosh(X) returned in floating-point register Fp0. -// -// Accuracy and Monotonicity: The returned result is within 3 ulps in -// 64 significant bit, i.e. within 0.5001 ulp to 53 bits if the -// result is subsequently rounded to double precision. The -// result is provably monotonic in double precision. -// -// Speed: The program sCOSH takes approximately 250 cycles. -// -// Algorithm: -// -// COSH -// 1. If |X| > 16380 log2, go to 3. -// -// 2. (|X| <= 16380 log2) Cosh(X) is obtained by the formulae -// y = |X|, z = exp(Y), and -// cosh(X) = (1/2)*( z + 1/z ). -// Exit. -// -// 3. (|X| > 16380 log2). If |X| > 16480 log2, go to 5. -// -// 4. (16380 log2 < |X| <= 16480 log2) -// cosh(X) = sign(X) * exp(|X|)/2. -// However, invoking exp(|X|) may cause premature overflow. -// Thus, we calculate sinh(X) as follows: -// Y := |X| -// Fact := 2**(16380) -// Y' := Y - 16381 log2 -// cosh(X) := Fact * exp(Y'). -// Exit. -// -// 5. (|X| > 16480 log2) sinh(X) must overflow. Return -// Huge*Huge to generate overflow and an infinity with -// the appropriate sign. Huge is the largest finite number in -// extended format. Exit. -// -// - -// Copyright (C) Motorola, Inc. 1990 -// All Rights Reserved -// -// THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA -// The copyright notice above does not evidence any -// actual or intended publication of such source code. - -//SCOSH idnt 2,1 | Motorola 040 Floating Point Software Package - - |section 8 - - |xref t_ovfl - |xref t_frcinx - |xref setox - -T1: .long 0x40C62D38,0xD3D64634 // ... 16381 LOG2 LEAD -T2: .long 0x3D6F90AE,0xB1E75CC7 // ... 16381 LOG2 TRAIL - -TWO16380: .long 0x7FFB0000,0x80000000,0x00000000,0x00000000 - - .global scoshd -scoshd: -//--COSH(X) = 1 FOR DENORMALIZED X - - fmoves #0x3F800000,%fp0 - - fmovel %d1,%FPCR - fadds #0x00800000,%fp0 - bra t_frcinx - - .global scosh -scosh: - fmovex (%a0),%fp0 // ...LOAD INPUT - - movel (%a0),%d0 - movew 4(%a0),%d0 - andil #0x7FFFFFFF,%d0 - cmpil #0x400CB167,%d0 - bgts COSHBIG - -//--THIS IS THE USUAL CASE, |X| < 16380 LOG2 -//--COSH(X) = (1/2) * ( EXP(X) + 1/EXP(X) ) - - fabsx %fp0 // ...|X| - - movel %d1,-(%sp) - clrl %d1 - fmovemx %fp0-%fp0,(%a0) //pass parameter to setox - bsr setox // ...FP0 IS EXP(|X|) - fmuls #0x3F000000,%fp0 // ...(1/2)EXP(|X|) - movel (%sp)+,%d1 - - fmoves #0x3E800000,%fp1 // ...(1/4) - fdivx %fp0,%fp1 // ...1/(2 EXP(|X|)) - - fmovel %d1,%FPCR - faddx %fp1,%fp0 - - bra t_frcinx - -COSHBIG: - cmpil #0x400CB2B3,%d0 - bgts COSHHUGE - - fabsx %fp0 - fsubd T1(%pc),%fp0 // ...(|X|-16381LOG2_LEAD) - fsubd T2(%pc),%fp0 // ...|X| - 16381 LOG2, ACCURATE - - movel %d1,-(%sp) - clrl %d1 - fmovemx %fp0-%fp0,(%a0) - bsr setox - fmovel (%sp)+,%fpcr - - fmulx TWO16380(%pc),%fp0 - bra t_frcinx - -COSHHUGE: - fmovel #0,%fpsr //clr N bit if set by source - bclrb #7,(%a0) //always return positive value - fmovemx (%a0),%fp0-%fp0 - bra t_ovfl - - |end |