While the option to make '*' mean dot product for vectors is important,
it breaks vector scaling in ruamoko progs as the resultant vector op
becomes a dot product instead of the indented hadamard product (ie,
component-wise).
This fixes the internal error generated by the likes of
`(sv_gravity * '0 0 1')` where sv_gravity is a float and `'0 0 1'` is an
ivec3: the vector is promoted to vec3 first so that expanding sv_gravity
is expanded to vec3 instead of ivec3 (which is not permitted for a
float: expansion requires the destination base type to be the same as
the source).
While swizzle does work, it requires the source to be properly aligned
and thus is not really the best choice. The extend instruction has no
alignment requirements (at all) and thus is much better suited to
converting a scalar to a vector type.
Fixes#30
While I might need to tighten up the rules later, this allows binary
operations between vector (the type) and explicitly typed vec3 constants
(and non-constants, about which I am undecided). The idea is that
explicit constants such as '1 2 3'f should be compatible with either
type.
This applies to quaternions as well.
Defs and symbols benefit from swizzling as that's one instruction vs 2-3
for loading a scalar into a vector component by component. Constants are
ok because the result gets converted to a vector constant.
The destination operand must be a full four component vector, but the
source can be smaller and small sources do not need to be aligned: the
offset of the source operand and the swizzle indices are adjusted. The
adjustments are done during final statement emission in order to avoid
confusing the data flow analyser (and that's when def offsets are known).
This allows all the tests to build and pass. I'll need to add tests to
ensure warnings happen when they should and that all vec operations are
correct (ouch, that'll be a lot of work), but vectors and quaternions
are working again.
I'd created new_value_expr some time ago, but never used it...
Also, replace convert_* with cast_expr to the appropriate type (removes
a pile of value check and create code).
Use with quaternions and vectors is a little broken in that
vec4/quaternion and vec3/vector are not the same types (by design) and
thus a cast is needed (not what I want, though). However, creating
vectors (that happen to be int due to int constants) does seem to be
working nicely otherwise.
The "not" because I'm pretty sure they're false positives due to when
the function is called, but clang doesn't know that (wonder why gcc was
ok with it).
Currently only via pragma (not command line options), but I needed to
test the concept. Converting legacy code is just too error prone.
Telling the compiler how to treat the operator makes more sense. When *
acts as @dot with Ruamoko progs, the result is automatically aliased as
a float as this is the legacy meaning (ie, float result for dot
product).
They're now properly part of the type system and can be used for
declaring variables, initialized (using {} block initializers), operated
on (=, *, + tested) though much work needs to be done on binary
expressions, and indexed. So far, only ivec2 has been tested.
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).
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.
long is ignored for double, and v6p progs are stuck with 32 bits for
longs (don't feel like extending v6p any further), but the basics are
there for Ruamoko.
short is ignored for ints because the minimum size is 32, and signed is
just noise for ints anyway (and no chars, so...).
unsigned, however, is finally implemented properly (or at least seems to
be working correctly: tests pass after getting things compiling again,
and lt.u is used where it should be :)
And other related fields so integer is now int (and uinteger is uint). I
really don't know why I went with integer in the first place, but this
will make using macros easier for dealing with types.
The move operator names are definitely obsolete (due to dropping the
expressions a year or two ago) and the precedence checks seem to be
handled elsewhere. Memset and state expressions went away a while back
too.
While this was a pain to get working, that pain only went to prove the
value of using proper "types" (even if only an enum) for different
expression types: just finding all the places to edit was a chore, and
easy to make mistakes (forgetting bits here and there).
Strangely enough, this exposed a pile of *type* aliasing bugs (next
commit).
There's still some cleanup to do, but everything seems to be working
nicely: `make -j` works, `make distcheck` passes. There is probably
plenty of bitrot in the package directories (RPM, debian), though.
The vc project files have been removed since those versions are way out
of date and quakeforge is pretty much dependent on gcc now anyway.
Most of the old Makefile.am files are now Makemodule.am. This should
allow for new Makefile.am files that allow local building (to be added
on an as-needed bases). The current remaining Makefile.am files are for
standalone sub-projects.a
The installable bins are currently built in the top-level build
directory. This may change if the clutter gets to be too much.
While this does make a noticeable difference in build times, the main
reason for the switch was to take care of the growing dependency issues:
now it's possible to build tools for code generation (eg, using qfcc and
ruamoko programs for code-gen).
This is where constant folding should have happened all along. While
unary_expr should fold constants too, it seems to already try to do so
and it's a bit much of a mess to clean up right now.
