diff options
Diffstat (limited to 'c/src/lib/libcpu/m68k/m68040/fpsp/satanh.S')
| -rw-r--r-- | c/src/lib/libcpu/m68k/m68040/fpsp/satanh.S | 106 |
1 files changed, 0 insertions, 106 deletions
diff --git a/c/src/lib/libcpu/m68k/m68040/fpsp/satanh.S b/c/src/lib/libcpu/m68k/m68040/fpsp/satanh.S deleted file mode 100644 index 5ca76d8868..0000000000 --- a/c/src/lib/libcpu/m68k/m68040/fpsp/satanh.S +++ /dev/null @@ -1,106 +0,0 @@ -#include "fpsp-namespace.h" -// -// -// satanh.sa 3.3 12/19/90 -// -// The entry point satanh computes the inverse -// hyperbolic tangent of -// an input argument; satanhd does the same except for denormalized -// input. -// -// Input: Double-extended number X in location pointed to -// by address register a0. -// -// Output: The value arctanh(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 satanh takes approximately 270 cycles. -// -// Algorithm: -// -// ATANH -// 1. If |X| >= 1, go to 3. -// -// 2. (|X| < 1) Calculate atanh(X) by -// sgn := sign(X) -// y := |X| -// z := 2y/(1-y) -// atanh(X) := sgn * (1/2) * logp1(z) -// Exit. -// -// 3. If |X| > 1, go to 5. -// -// 4. (|X| = 1) Generate infinity with an appropriate sign and -// divide-by-zero by -// sgn := sign(X) -// atan(X) := sgn / (+0). -// Exit. -// -// 5. (|X| > 1) Generate an invalid operation by 0 * infinity. -// 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 -// - -// Copyright (C) Motorola, Inc. 1990 -// All Rights Reserved -// -// THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA -// The copyright notice above does not evidence any -// actual or intended publication of such source code. - -//satanh idnt 2,1 | Motorola 040 Floating Point Software Package - - |section 8 - - |xref t_dz - |xref t_operr - |xref t_frcinx - |xref t_extdnrm - |xref slognp1 - - .global satanhd -satanhd: -//--ATANH(X) = X FOR DENORMALIZED X - - bra t_extdnrm - - .global satanh -satanh: - movel (%a0),%d0 - movew 4(%a0),%d0 - andil #0x7FFFFFFF,%d0 - cmpil #0x3FFF8000,%d0 - bges ATANHBIG - -//--THIS IS THE USUAL CASE, |X| < 1 -//--Y = |X|, Z = 2Y/(1-Y), ATANH(X) = SIGN(X) * (1/2) * LOG1P(Z). - - fabsx (%a0),%fp0 // ...Y = |X| - fmovex %fp0,%fp1 - fnegx %fp1 // ...-Y - faddx %fp0,%fp0 // ...2Y - fadds #0x3F800000,%fp1 // ...1-Y - fdivx %fp1,%fp0 // ...2Y/(1-Y) - movel (%a0),%d0 - andil #0x80000000,%d0 - oril #0x3F000000,%d0 // ...SIGN(X)*HALF - movel %d0,-(%sp) - - fmovemx %fp0-%fp0,(%a0) // ...overwrite input - movel %d1,-(%sp) - clrl %d1 - bsr slognp1 // ...LOG1P(Z) - fmovel (%sp)+,%fpcr - fmuls (%sp)+,%fp0 - bra t_frcinx - -ATANHBIG: - fabsx (%a0),%fp0 // ...|X| - fcmps #0x3F800000,%fp0 - fbgt t_operr - bra t_dz - - |end |