Thanks to the size of the type encoding being explicit in the encoding,
anything that tries to read the encodings without expecting the width
will simply skip over the width, as it is placed after the ev type in
the encoding.
Any code that needs to read both the old encodings and the new can check
the size of the basic encodings to see if the width field is present.
It's full of evil hacks, but has always been an evil hack relying on
undefined behavior. The weird shenanigans with local variables are
because Ruamoko doesn't copy the parameters like v6p does and thus v and
z are NOT adjacent as parameters. Worse, the padding is uninitialized
and thus should not be relied upon to be any particular value. Still
does a nice job of testing dot products, though.
With explicit operators, even. While they're a tad verbose, they're at
least unambiguous and most importantly have the right precedence (or at
least adjustable precedence if I got it wrong, but vector ops having
high precedence than scalar or component seems reasonable to me).
I don't remember why I did this originally, but it causes the dags code
to lose the offset temp alias when accessing fields on structural temps
(known to be the case for vectors (temp-component.r), and I seem to
remember having problems with structs).
While it specifically checks vectors, I'm pretty sure it applies to
structs, too. Also, it's a little redundant with vecaddr.r, but is much
more specific and far less evil in what it does (no horrible pointer
shenanigans): just something that is fairly common practice.
Since Ruamoko progs must use lea to get the address of a local variable,
add use/def/kill references to the move instruction in order to inform
flow analysis of the variable since it is otherwise lost via the
resulting pointer (not an issue when direct var reference move can be
used).
The test and digging for the def can probably do with being more
aggressive, but this did nicely as a proof of concept.
This code now reaches into one level of the expression tree and
rearranges the nodes to allow the constant folder to do its things, but
only for ints, and only when the folding is trivially correct (* and *,
+/- and +/-). There may be more opportunities, but these cover what I
needed for now and anything more will need code generation or smarter
tree manipulation as things are getting out of hand.
It now addressing_mode cleaning up store instructions to use ptr+offset
instead of lea;store ptr...
Entity.field addressing has been impelmented as well.
Move instructions still generate sub-optimal code in that they use an
add instruction instead of lea.
This allows the code handling simple pointer dereferences to recurse
along an alias chain that resulted from casting between different
pointer types (such chains could probably be eliminated by replacing the
type in the original pointer expression, but it wasn't worth it at this
stage).
Aliasing an alias expression to the same type as the original aliased
expression is a no-op, so drop the alias entirely in order to simplify
code generation.
Simply dereferencing a pointer does not need to go through array_expr
and thus collect a 0 offset that will only be constant-folded out again.
Really just a minor optimization in qfcc, but at one stage in today's
modification, it resulted in some unwanted aliasing chains.
While this does make the generated code a little worse, load is behaving
nicely), the two are at least consistent with each other and when I fix
one, I'll fix both. I missed this change the other day when I did the
address_expr cleanup. Yay near-duplicate code :P
This is what using new_ret_expr would result in, but new_ret_expr is no
longer used for referencing .return (except in pascal, but I haven't
gotten around to sorting that out) due to the recent changes for Ruamoko
progs. Fixes an ICE when compiling (with optimization) something like
the following (dir is a vector):
dir /= sqrt (dir * dir);
return dir * speed;
It turns out the sorting wasn't working properly and I've decided that
anything that actually needs the defs to be sorted by address (such as a
debugger searching for defs by address) can do the sorting itself. Fixes
a weird swapping of def names.
This is necessary to get statement disassembly working, and likely
debugging in general. locals is the total size of the stack frame and
thus reaches above the function-entry stack pointer, and params_start is
the local space relative start of the parameters. Thus, knowing the
function-entry stack pointer, the bottom of the locals space can be
found by subtracting params_start, and the top of the locals space by
adding (locals - params_start).
This gets all the sections of the progs file nicely aligned and the code
easier to read with the offset and size calculations not being spread
through the function. ivar-struct-return now works when compiled for
Ruamoko.
This cleans up dprograms_t, making it easier to read and see what chunks
are in it (I was surprised to see only 6, the explicit pairs made it
seem to have more).
While I think the reason the dags code moved an instruction before
adjstk and with was they shared a constant with that instruction (which
is a different bug), this ensures other instructions cannot get
reordered in front of adjstk and with, as doing so would cause any such
instructions to access incorrect data.
The goal was to get lea being used for locals in ruamoko progs because
lea takes the base registers into account while the constant pointer
defs used by v6p cannot. Pointer defs are still used for gobals as they
may be out of reach of 16-bit addressing.
address_expr() has been simplified in that it no longer takes an offset:
the vast majority of the callers never passed one, and the few that did
have been reworked to use other mechanisms. In particular,
offset_pointer_expr does the manipulations needed to add an offset
(unscaled by type size) to a pointer. High-level pointer offsets still
apply a scale, though.
Alias expressions now do a better job of hanling aliasing of aliases by
simply replacing the target type when possible.
It's possible I lost the child printing when creating the return
expressions, but dot diagrams are much more useful when they don't have
nodes with just pointer values.
The parameter defs are allocated from the parameter space using a
minimum alignment of 4, and varargs functions get a va_list struct in
place of the ...
An "args" expression is unconditionally injected into the call arguments
list at the place where ... is in the list, with arguments passed
through ... coming after the ...
Arguments get through to functions now, but there's problems with taking
the address of local variables: currently done using constant pointer
defs, which can't work for the base register addressing used in Ruamoko
progs.
With the update to test-bi's printf (and a hack to qfcc for lea),
triangle.r actually works, printing the expected results (but -1 instead
of 1 for equality, though that too is actually expected). qfcc will take
a bit longer because it seems there are some design issues in address
expressions (ambiguity, and a few other things) that have pretty much
always been there.
The aux use ops need to be counted and given nodes explicitly as they
may refer to defs that are not accessed by other statements other than
by aliases, and those aliases need to be marked live as well as the used
def.
This is part of the work for #26 (Record resource pointer with builtin
function data). Currently, the data pointer gets as far as the
per-instance VM function table (I don't feel like tackling the job of
converting all the builtin functions tonight). All the builtin modules
that register a resources data block pass that block on to
PR_RegisterBuiltins.
