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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include <mach.h>
+
+.help IEEE
+.nf ------------------------------------------------------------------------
+Low level primitives for IEEE to native floating point datatype conversions.
+See also the MII package, which provides a higher level interface, and the
+IEEE related definitions in <mach.h>.
+
+ ieepak[rd] (datum) # scalar conversions
+ ieeupk[rd] (datum)
+ ieevpak[rd] (native, ieee, nelem) # vector conversions
+ ieevupk[rd] (ieee, native, nelem)
+ iee[sg]nan[rd] (NaN) # NaN handling
+ ieemap[rd] (mapin, mapout)
+ ieestat[rd] (nin, nout)
+ ieezstat[rd] ()
+
+The first two routines handle scalar conversions, the second two routines
+vector conversions. The input and output vectors may be the same.
+Unfortunately, for portability reasons, functions cannot be used, so the
+scalar operators do an in-place conversion instead, and are a no-op on an
+unswapped IEEE system. The routines iee[sg]nan[rd] set/get the native
+floating value used to replace NaNs or overflows occuring when converting
+IEEE to the native floating format (any floating value will do, e.g., zero or
+INDEFR). If NaN mapping is enabled, the ieestat[rd] routines may be used to
+determine the number of input or output NaN conversions occuring since the
+last call to ieezstat[rd].
+
+The NaN mapping enable switch and statistics counters are UNDEFINED at
+process startup; programs which use the IEEE conversion package should call
+ieemap[rd] to enable or disable NaN mapping, and ieezstat[rd] to initialize
+the statistics counters.
+
+The routines in this file are the "portable" versions. The "portable"
+solution it to merely copy the array, swapping the bytes if necessary - this
+works on any host that uses the IEEE floating format. NaN mapping is
+implemented in the portable code, but will work properly only for input
+conversions; for output, the IEEE NaN value is undefined in the portable
+version of the code (it is trivial to supply this value in an as$ieee.gx
+version of the code).
+If the local host does
+not use IEEE floating, or if a significant efficiency gain can be realized
+by programming in assembler or C, a host specific version of this file should
+be written, placed in AS, and referenced in the MKPKG special file list.
+.endhelp -------------------------------------------------------------------
+
+
+# Give the generic preprocessor some help.
+define IEEE_SWAP IEEE_SWAP4
+define BSWAP bswap4
+define NSWAP 4
+
+
+# IEEVPAK -- Convert an array in the native floating point format into an
+# array in IEEE floating format. The input and output arrays can be the same.
+
+procedure ieevpakr (native, ieee, nelem)
+
+real native[ARB] #I input native floating format array
+real ieee[ARB] #O output IEEE floating format array
+int nelem #I number of floating point numbers
+
+int i
+real native_NaN, ieee_NaN
+int mapin, mapout, nin, nout, NaNmask
+common /ieenanr/ native_NaN, ieee_NaN, NaNmask, mapin, mapout, nin, nout
+
+begin
+ if (mapout == NO) {
+ if (IEEE_SWAP == YES)
+ call BSWAP (native, 1, ieee, 1, nelem * NSWAP)
+ else
+ call amovr (native, ieee, nelem)
+ } else {
+ do i = 1, nelem
+ if (native[i] == native_NaN) {
+ ieee(i) = ieee_NaN
+ nout = nout + 1
+ } else
+ ieee[i] = native[i]
+
+ # Byteswap if necessary.
+ if (IEEE_SWAP == YES)
+ call BSWAP (ieee, 1, ieee, 1, nelem * NSWAP)
+ }
+end
+
+
+# IEEVUPK -- Convert an array in IEEE floating format into the native
+# floating point format. The input and output arrays can be the same.
+
+procedure ieevupkr (ieee, native, nelem)
+
+real ieee[ARB] #I input IEEE floating format array
+real native[ARB] #O output native floating format array
+int nelem #I number of floating point numbers
+
+int i
+real fval
+int ival[1]
+% equivalence (fval, ival)
+
+real native_NaN, ieee_NaN
+int mapin, mapout, nin, nout, NaNmask
+common /ieenanr/ native_NaN, ieee_NaN, NaNmask, mapin, mapout, nin, nout
+
+begin
+ if (IEEE_SWAP == YES) {
+ call BSWAP (ieee, 1, native, 1, nelem * NSWAP)
+ if (mapin != NO)
+ do i = 1, nelem {
+ fval = native[i]
+ if (and (ival[1], NaNmask) == NaNmask) {
+ native[i] = native_NaN
+ nin = nin + 1
+ }
+ }
+ } else {
+ if (mapin == NO)
+ call amovr (ieee, native, nelem)
+ else {
+ do i = 1, nelem {
+ fval = ieee[i]
+ if (and (ival[1], NaNmask) == NaNmask) {
+ native[i] = native_NaN
+ nin = nin + 1
+ } else
+ native[i] = ieee[i]
+ }
+ }
+ }
+end
+
+
+# IEEPAK -- Convert a native floating point number into IEEE format.
+
+procedure ieepakr (x)
+
+real x #U datum to be converted
+
+real native_NaN, ieee_NaN
+int mapin, mapout, nin, nout, NaNmask
+common /ieenanr/ native_NaN, ieee_NaN, NaNmask, mapin, mapout, nin, nout
+
+begin
+ if (mapout != NO)
+ if (x == native_NaN) {
+ x = ieee_NaN
+ nout = nout + 1
+ }
+ if (IEEE_SWAP == YES)
+ call BSWAP (x, 1, x, 1, NSWAP)
+end
+
+
+# IEEUPK -- Convert an IEEE format number into native floating point.
+
+procedure ieeupkr (x)
+
+real x #U datum to be converted
+
+real fval
+int ival[1]
+% equivalence (fval, ival)
+
+real native_NaN, ieee_NaN
+int mapin, mapout, nin, nout, NaNmask
+common /ieenanr/ native_NaN, ieee_NaN, NaNmask, mapin, mapout, nin, nout
+
+begin
+ if (IEEE_SWAP == YES)
+ call BSWAP (x, 1, x, 1, NSWAP)
+ if (mapin != NO) {
+ fval = x
+ if (and (ival[1], NaNmask) == NaNmask) {
+ x = native_NaN
+ nin = nin + 1
+ }
+ }
+end
+
+
+# IEESNAN -- Set the native floating point value used to replace NaNs and
+# overflows when converting IEEE to native. This must be a legal (finite)
+# native floating point value. Setting the reserved native pseudo-NaN value
+# has the side effect of enabling NaN mapping and zeroing the statistics
+# counters.
+
+procedure ieesnanr (x)
+
+real x #I native value which will replace NaN
+
+real native_NaN, ieee_NaN
+int mapin, mapout, nin, nout, NaNmask
+common /ieenanr/ native_NaN, ieee_NaN, NaNmask, mapin, mapout, nin, nout
+
+begin
+ native_NaN = x
+ call ieemapr (YES, YES)
+ nin = 0
+ nout = 0
+end
+
+
+# IEEGNAN -- Get the NaN value.
+
+procedure ieegnanr (x)
+
+real x #O native value which will replace NaN
+
+real native_NaN, ieee_NaN
+int mapin, mapout, nin, nout, NaNmask
+common /ieenanr/ native_NaN, ieee_NaN, NaNmask, mapin, mapout, nin, nout
+
+begin
+ x = native_NaN
+end
+
+
+# IEESTAT -- Return statistics on the number of NaNs encountered in input
+# conversions (unpack) and output conversions (pack).
+
+procedure ieestatr (o_nin, o_nout)
+
+int o_nin #O number of NaN seen on input
+int o_nout #O number of NaN values output
+
+real native_NaN, ieee_NaN
+int mapin, mapout, nin, nout, NaNmask
+common /ieenanr/ native_NaN, ieee_NaN, NaNmask, mapin, mapout, nin, nout
+
+begin
+ o_nin = nin
+ o_nout = nout
+end
+
+
+# IEEZSTAT -- Zero the statistics counters.
+
+procedure ieezstatr ()
+
+real native_NaN, ieee_NaN
+int mapin, mapout, nin, nout, NaNmask
+common /ieenanr/ native_NaN, ieee_NaN, NaNmask, mapin, mapout, nin, nout
+
+begin
+ nin = 0
+ nout = 0
+end
+
+
+# MACHINE DEPENDENT PART.
+# ---------------------------
+
+# IEEMAP -- Enable or disable NaN mapping.
+#
+# sEEE EEEE Emmm mmmm mmmm mmmm mmmm mmmm
+# 3 2 1 0
+# 1098 7654 3210 9876 5432 1098 7654 3210
+# 7 f 8 0 0 0 0 0
+
+procedure ieemapr (inval, outval)
+
+int inval #I enable NaN mapping for input?
+int outval #I enable NaN mapping for output?
+
+# MACHDEP.
+real fval
+int ival[1]
+% equivalence (fval, ival)
+% data ival(1) / '7ff7ffff'x /
+
+real native_NaN, ieee_NaN
+int mapin, mapout, nin, nout, NaNmask
+common /ieenanr/ native_NaN, ieee_NaN, NaNmask, mapin, mapout, nin, nout
+
+begin
+ mapin = inval
+ mapout = outval
+
+ # MACHDEP.
+ if (mapout == YES)
+ ieee_NaN = fval
+
+ if (mapin == YES)
+ NaNmask = 7F800000X
+end
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