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Diffstat (limited to 'c/src/lib/libcpu/m68k/m68040/fpsp/sasin.S')
| -rw-r--r-- | c/src/lib/libcpu/m68k/m68040/fpsp/sasin.S | 106 |
1 files changed, 0 insertions, 106 deletions
diff --git a/c/src/lib/libcpu/m68k/m68040/fpsp/sasin.S b/c/src/lib/libcpu/m68k/m68040/fpsp/sasin.S deleted file mode 100644 index 529ae83328..0000000000 --- a/c/src/lib/libcpu/m68k/m68040/fpsp/sasin.S +++ /dev/null @@ -1,106 +0,0 @@ -#include "fpsp-namespace.h" -// -// -// sasin.sa 3.3 12/19/90 -// -// Description: The entry point sAsin computes the inverse sine of -// an input argument; sAsind does the same except for denormalized -// input. -// -// Input: Double-extended number X in location pointed to -// by address register a0. -// -// Output: The value arcsin(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 sASIN takes approximately 310 cycles. -// -// Algorithm: -// -// ASIN -// 1. If |X| >= 1, go to 3. -// -// 2. (|X| < 1) Calculate asin(X) by -// z := sqrt( [1-X][1+X] ) -// asin(X) = atan( x / z ). -// Exit. -// -// 3. If |X| > 1, go to 5. -// -// 4. (|X| = 1) sgn := sign(X), return asin(X) := sgn * Pi/2. 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 -// - -// Copyright (C) Motorola, Inc. 1990 -// All Rights Reserved -// -// THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA -// The copyright notice above does not evidence any -// actual or intended publication of such source code. - -//SASIN idnt 2,1 | Motorola 040 Floating Point Software Package - - |section 8 - -PIBY2: .long 0x3FFF0000,0xC90FDAA2,0x2168C235,0x00000000 - - |xref t_operr - |xref t_frcinx - |xref t_extdnrm - |xref satan - - .global sasind -sasind: -//--ASIN(X) = X FOR DENORMALIZED X - - bra t_extdnrm - - .global sasin -sasin: - fmovex (%a0),%fp0 // ...LOAD INPUT - - movel (%a0),%d0 - movew 4(%a0),%d0 - andil #0x7FFFFFFF,%d0 - cmpil #0x3FFF8000,%d0 - bges asinbig - -//--THIS IS THE USUAL CASE, |X| < 1 -//--ASIN(X) = ATAN( X / SQRT( (1-X)(1+X) ) ) - - fmoves #0x3F800000,%fp1 - fsubx %fp0,%fp1 // ...1-X - fmovemx %fp2-%fp2,-(%a7) - fmoves #0x3F800000,%fp2 - faddx %fp0,%fp2 // ...1+X - fmulx %fp2,%fp1 // ...(1+X)(1-X) - fmovemx (%a7)+,%fp2-%fp2 - fsqrtx %fp1 // ...SQRT([1-X][1+X]) - fdivx %fp1,%fp0 // ...X/SQRT([1-X][1+X]) - fmovemx %fp0-%fp0,(%a0) - bsr satan - bra t_frcinx - -asinbig: - fabsx %fp0 // ...|X| - fcmps #0x3F800000,%fp0 - fbgt t_operr //cause an operr exception - -//--|X| = 1, ASIN(X) = +- PI/2. - - fmovex PIBY2,%fp0 - movel (%a0),%d0 - andil #0x80000000,%d0 // ...SIGN BIT OF X - oril #0x3F800000,%d0 // ...+-1 IN SGL FORMAT - movel %d0,-(%sp) // ...push SIGN(X) IN SGL-FMT - fmovel %d1,%FPCR - fmuls (%sp)+,%fp0 - bra t_frcinx - - |end |