On Thursday 05 June 2008 22:01:15 Tristan Gingold wrote: > On Thu, Jun 05, 2008 at 12:13:19PM +0200, [EMAIL PROTECTED] wrote: > > > this is slightly too vague. I tried a few cases and all were > > > sucessfull. What is the type of xyz ? > > > > The type was a subtype to integer. > > > > The reason is I like to use 'high 'low 'range etc... rather to hardcode > > limits in the software. That allows to change the limits ( or take > > values from a generic ) without reviewing the code, and to set all > > parameters on the begining of the architecture. > > Yes, this is a very common use of for generate. > Can you send me a reproducer ? That would be very useful.
I don't know if this is what the OP meant, but here is an example of
where 'high and 'low work, but 'range doesn't. What I'm not clear on, is if
this is a bug in GHDL or is standard behavior.
entity bug is
end entity;
architecture works of bug is
subtype t1 is integer range 1 to 2;
begin
gen : for i in t1'low to t1'high generate
assert false report integer'image(i) severity note;
end generate;
end architecture;
$ ghdl -a bug.vhdl
$ ghdl -m bug
elaborate bug
$ ./bug
test.vhdl:9:5:@0ms:(assertion note): 1
test.vhdl:9:5:@0ms:(assertion note): 2
On the other hand:
entity bug is
end entity;
architecture does_not_work of bug is
subtype t1 is integer range 1 to 2;
begin
gen : for i in t1'range generate
assert false report integer'image(i) severity note;
end generate;
end architecture;
$ ghdl -a bug.vhdl
bug.vhdl:8:21: prefix of range attribute must be an array type or object
bug.vhdl:8:3: range must be a static discrete range
bug.vhdl:9:39: can't match 'i' with type integer
/usr/lib/ghdl/bin/ghdl: compilation error
Again, I don't know if this a bug or a standard VHDL "feature", but this may
be what the OP meant.
--
Wesley J. Landaker <[EMAIL PROTECTED]> <xmpp:[EMAIL PROTECTED]>
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