Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 115 insertions, 0 deletions

diff --git a/arch/m68k/fpsp040/sacos.S b/arch/m68k/fpsp040/sacos.S
new file mode 100644
index 00000000000..83b00ab1c48
--- /dev/null
+++ b/arch/m68k/fpsp040/sacos.S
@@ -0,0 +1,115 @@
+|
+|       sacos.sa 3.3 12/19/90
+|
+|       Description: The entry point sAcos computes the inverse cosine of
+|               an input argument; sAcosd does the same except for denormalized
+|               input.
+|
+|       Input: Double-extended number X in location pointed to
+|               by address register a0.
+|
+|       Output: The value arccos(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 sCOS takes approximately 310 cycles.
+|
+|       Algorithm:
+|
+|       ACOS
+|       1. If |X| >= 1, go to 3.
+|
+|       2. (|X| < 1) Calculate acos(X) by
+|               z := (1-X) / (1+X)
+|               acos(X) = 2 * atan( sqrt(z) ).
+|               Exit.
+|
+|       3. If |X| > 1, go to 5.
+|
+|       4. (|X| = 1) If X > 0, return 0. Otherwise, return Pi. 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+|       THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA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.
+
+|SACOS  idnt    2,1 | Motorola 040 Floating Point Software Package
+
+        |section        8
+
+PI:     .long 0x40000000,0xC90FDAA2,0x2168C235,0x00000000
+PIBY2:  .long 0x3FFF0000,0xC90FDAA2,0x2168C235,0x00000000
+
+        |xref   t_operr
+        |xref   t_frcinx
+        |xref   satan
+
+        .global sacosd
+sacosd:
+|--ACOS(X) = PI/2 FOR DENORMALIZED X
+        fmovel          %d1,%fpcr               | ...load user's rounding mode/precision
+        fmovex          PIBY2,%fp0
+        bra             t_frcinx
+
+        .global sacos
+sacos:
+        fmovex          (%a0),%fp0      | ...LOAD INPUT
+
+        movel           (%a0),%d0               | ...pack exponent with upper 16 fraction
+        movew           4(%a0),%d0
+        andil           #0x7FFFFFFF,%d0
+        cmpil           #0x3FFF8000,%d0
+        bges            ACOSBIG
+
+|--THIS IS THE USUAL CASE, |X| < 1
+|--ACOS(X) = 2 * ATAN(  SQRT( (1-X)/(1+X) )     )
+
+        fmoves          #0x3F800000,%fp1
+        faddx           %fp0,%fp1               | ...1+X
+        fnegx           %fp0            | ... -X
+        fadds           #0x3F800000,%fp0        | ...1-X
+        fdivx           %fp1,%fp0               | ...(1-X)/(1+X)
+        fsqrtx          %fp0            | ...SQRT((1-X)/(1+X))
+        fmovemx %fp0-%fp0,(%a0) | ...overwrite input
+        movel           %d1,-(%sp)      |save original users fpcr
+        clrl            %d1
+        bsr             satan           | ...ATAN(SQRT([1-X]/[1+X]))
+        fmovel          (%sp)+,%fpcr    |restore users exceptions
+        faddx           %fp0,%fp0               | ...2 * ATAN( STUFF )
+        bra             t_frcinx
+
+ACOSBIG:
+        fabsx           %fp0
+        fcmps           #0x3F800000,%fp0
+        fbgt            t_operr         |cause an operr exception
+
+|--|X| = 1, ACOS(X) = 0 OR PI
+        movel           (%a0),%d0               | ...pack exponent with upper 16 fraction
+        movew           4(%a0),%d0
+        cmpl            #0,%d0          |D0 has original exponent+fraction
+        bgts            ACOSP1
+
+|--X = -1
+|Returns PI and inexact exception
+        fmovex          PI,%fp0
+        fmovel          %d1,%FPCR
+        fadds           #0x00800000,%fp0        |cause an inexact exception to be put
+|                                       ;into the 040 - will not trap until next
+|                                       ;fp inst.
+        bra             t_frcinx
+
+ACOSP1:
+        fmovel          %d1,%FPCR
+        fmoves          #0x00000000,%fp0
+        rts                             |Facos ; of +1 is exact
+
+        |end