des@frogland.inmos.co.uk (David Shepherd) (11/27/90)
Here is a list of known "bugs"/"features" in the Transputer Instruction
Set/Compiler Writer's Guide book.
If you are aware of any others please email me with details
(des@inmos.co.uk or des@inmos.com) so that I can update this list.
david shepherd
PS
1) I am not, nor ever have been, a member of the documentation group at
INMOS and thus I have no knowledge of what they are producing for more
recent transputer variants (e.g. T425) or even H-1 so don't bother
asking me!
2) Please do not send me your list of "everything I always wanted to
know about the transputer instruction set" questions as I don't have
time to handle such questions.
------------------------------------------------------------------------
Transputer Instruction Set
A compiler writer's guide
Errata sheet
David Shepherd
November 27, 1990
This is an ascii-ized version of a LaTeX document. Unavailable symbols have
been replaced by words were necessary.
Page Line Date Description
38 20 21-jun-90 Add to end of paragraph "stoperr also saves the
Iptr of an erroneous process in (Wptr-1) before
scheduling the next process to allow it to be
analyzed or restarted later."
46 16 10-jan-90 The workspace pointer must have the same value
at each of the alt, altwt, altend and enable or
disable instructions. It may however be changed,
for example, while evaluating an argument to an
enable instruction. However, (Wptr-3) must not be
changed between the alt and altend.
55 -2 28-jun-90 bracketting wrong - should be
and exists m:Z, r:[-pi,pi] . x = (m times 2 pi) +
r and (r = x, REM, 2 pi)
65 -1 10-apr-89 should read "... this will include the most
significant bit ... "
67 -6 21-jun-90 Add new paragraph:
The current process must not be descheduled between
the move2dinit and the actual 2d move instruction.
78 1-13 1-sep-88 Descriptions of j and lend should state that the
jump has not been taken rather than has as in
original version. Descriptions of stopp, in and
out should also say that Wptr-1 has been set to the
value of Iptr.
84 -12 7-aug-90 add a new section
Memstart
MemStart is the address of the first word above
the special RAM locations at the bottom of the
memory map. Because different transputer variants
store different information in these special RAM
locations MemStart differs between variants. The
values for current processors are
IMS T212 #8024
IMS T414 #80000048
IMS T425 #80000070
IMS T800 #80000070
the values for these and other variants are given
in the relevant datasheets.
85 8 7-nov-89 "(Wptr-3) ... contains the address of the data to
be transferred." Instead of "... address of the
channel being used."
91 -10 21-jun-90 should be ldnlp x-offset not ldlp x-offset
92 4 22-jul-88 "ldl x; E; wsub" should be "E; ldl x; wsub"
117 -1 22-aug-88 Code for out should be #0B
118 -7,-6 3-nov-88 Cycles for lsum and ldiff should be 3 not 2
118 -15 21-jun-90 Change the Cycles for stoperr to "dagger" as it
depends on the error state - the value given is for
when the error is not set.
120 -10- -7 8-feb-89 Cycles for fpldnlsn, fpldnldb, fpldnlsni and
fpldnldbi should be 2,4,4 and 6 respectively.
131 -2 23-aug-90 Far too many "the's" - the "the the" should be
"the'!
132 9-12 30-oct-89 Should be ByteMem and not Mem
134 20 31-aug-88 In specification of call add
Breg' = undefined
Creg' = undefined
134 24 26-jun-90 0 7! NextInst not Iptr
135 -17,-15 9-jul-90 delete "or (Areg = -1 and Breg = -2**(wordlength-
1))" and the corresponding term 2 lines below
136 -17,-11 16-oct-89 should be "Areg <=(unsigned) wordlength" in both
cases
140 13,26 26-jun-90 occuring spelt wrong
142 -11 23-mar-89 should read ... `schedule next waiting process
saving Iptr in current workspace'
142 -4 25-jun-90 condition of implication should be
"Areg <= Breg < 2 x Areg"
150 -9 21-jun-90 should be "@value" and not "value"
152 6,7 13-sep-88 both occurences of Breg should be Breg x 2
159 18,25 20-jun-90 The precondition fv FAreg "in" [MinINT32,MaxINT32]
should be removed. Line 25 should be
Mem' = Mem "overwrite" f Areg "mapsto"
(RETYPE []INT(INT"infinity" TRUNC pack(FAreg))[0]g
Remember, the Transputer Instruction Set book only covers the IMS T212, IMS
T414 and IMS T800. Subsequent transputers have some additional features which
are not documented here. Additional documentation should be available for
these.
--------------------------------------------------------------------------
david shepherd: des@inmos.co.uk or des@inmos.com tel: 0454-616616 x 529
inmos ltd, 1000 aztec west, almondsbury, bristol, bs12 4sq
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