The alignment is specified as a power of 2 (ie, actual alignment = 1 <<
alignment) allowing old object files to be compatible (as their
alignment is 0). This is necessary for (in part for #30) as it turned
out even global vectors were not aligned correctly.
Currently, only data spaces even vaguely respect alignment. This may
need to be fixed in the future.
Most were pretty easy and fairly logical, but gib's regex was a bit of a
pain until I figured out the real problem was the conditional
assignments.
However, libs/gamecode/test/test-conv4 fails when optimizing due to gcc
using vcvttps2dq (which is nice, actually) for vector forms, but not the
single equivalent other times. I haven't decided what to do with the
test (I might abandon it as it does seem to be UD).
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 reverts commit 2904c619c1.
In order to support swizzle operations, I need to be able to alias defs
to larger types (eg, float to vec4), but alias_def rightly won't allow
this. However, as the plan is to do this in the final steps before
emitting the instruction, I plan on creating an alias to a float then
adjusting the type in the alias, but to do so without extra shenanigans,
I need alias_def to allow aliases to the same type. As a fringe benefit,
it makes the code agree with the comment in def.h :P
This came up when investigating an internal error from the line above.
It turned out the error was correct (problem with converting scalars to
vectors), but the break was not.
Currently, only vector/vec3 and quaternion/vec4 can be printed anyway,
but I plan on making explicit format strings for the types, so there
should be no need to promote any vector types (and really, any hidden
promotion is a bit of a pain, but standards...).
While the code would handle int vector types, there aren't any such
instructions, and the expression code shouldn't generate them, but all
float (32 and 64 bit) vector types do have a dot product instruction, so
check width rather than just vector/quaternion.
This fixes an error that's been lurking for over two years (since I made
parameters unlimited internally). The problem was the array was being
allocated on the stack and a simple struct copy was used to store type
type, resulting in a dangling pointer onto the stack. I'm surprised it
didn't cause more problems.
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.
With this, all vector widths and types are supported: 2, 3, 4 and int,
uint, long, ulong, float and double, along with support for suffixes to
make the type explicit: '1 2'd specifies a dvec2 constant, while '1 2 3'u
is a uivec3 constant. Default types are double (dvec2, dvec3, dvec4) for
literals with float-type components, and int (ivec2...) for those with
integer-type components.
Having three very similar sets of code for outputting values (just for
debug purposes even) got to be a tad annoying. Now there's only one, and
in the right place, too (with the other value code).
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.
Nicely, I was able to reuse the generated conversion code used by the
progs engine to do the work in qfcc, just needed appropriate definitions
for the operand macros, and to set up the conversion code. Helped
greatly by the new value load/store functions.
pr_type_t now contains only the one "value" field, and all the access
macros now use their PACKED variant for base access, making access to
larger types more consistent with the smaller types.
This is an extremely extensive patch as it hits every cvar, and every
usage of the cvars. Cvars no longer store the value they control,
instead, they use a cexpr value object to reference the value and
specify the value's type (currently, a null type is used for strings).
Non-string cvars are passed through cexpr, allowing expressions in the
cvars' settings. Also, cvars have returned to an enhanced version of the
original (id quake) registration scheme.
As a minor benefit, relevant code having direct access to the
cvar-controlled variables is probably a slight optimization as it
removed a pointer dereference, and the variables can be located for data
locality.
The static cvar descriptors are made private as an additional safety
layer, though there's nothing stopping external modification via
Cvar_FindVar (which is needed for adding listeners).
While not used yet (partly due to working out the design), cvars can
have a validation function.
Registering a cvar allows a primary listener (and its data) to be
specified: it will always be called first when the cvar is modified. The
combination of proper listeners and direct access to the controlled
variable greatly simplifies the more complex cvar interactions as much
less null checking is required, and there's no need for one cvar's
callback to call another's.
nq-x11 is known to work at least well enough for the demos. More testing
will come.
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).
It seems clang defaults to unsigned for enums. Interestingly, gcc was ok
with the checks being either way. I guess gcc treats enums that *can* be
unsigned as DWIM.
In working with vectors and matrices while testing the scene wrappers, I
found that there was a fair bit of confusion about how large something
could be. Return values can be up to 32 words (but qfcc wasn't aware of
that), parameters were limited to 4 words still (and possibly should be
for varargs), and temp defs were limited to 8 words (1 lvec4). Temps are
used for handling return values (at least when not optimizing) and thus
must be capable of holding a return value, and passing large arguments
through *formal* parameters should be allowed. It seems reasonable to
limit parameter sizes to return value sizes.
A temp and a move are still used for large return values (4x4 matrix),
but that's an optimization issue: the code itself is at least correct.
When the def can be found. This fixes direct assignments to arrays (and
probably structs) getting lost when the array is later read using a
variable index.
Float is not int, and Ruamoko has only int ifz/ifnz, which will fail for
-0.0 (0x80000000 when viewed as an int). And then there's nan, but I
haven't seen too many of those in quake.
I suspect this is an ancient bug that wasn't noticed due to not looking
at progs.src compiled code enough, but it makes the first statements of
the function point to the correct line instead of a forward declaration.
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).
This is a very tiny optimization, but there's no point in adjust the
stack if there's no actual adjustment. I didn't bother with it initially
because I thought it wouldn't happen (and I was more interested in
getting things working first), but it turns out that simple getters that
result in a zero adjustment are quite common (70/535 in qwaq-app.dat).
This is achieved by marking a void function with the void_return
attribute and then calling that function in an @return expression.
@return can be used only inside a void function and only with void
functions marked with the void_return attribute. As this is intended for
Objective-QC message forwarding, it is deliberately "difficult" to use
as returning a larger than expected value is unlikely to end well for
the calling function.
However, as a convenience, "@return nil" is allowed (in a void
function). It always returns an integer (which, of course,can be
interpreted as a pointer). This is safe because if the return value is
ignored, it will go into the progs return buffer, and if it is not
ignored, it is the smallest value that can be returned.
Having to remember to copy yet another specifier bit was getting
tedious, so use a union of a struct with the bitfields and an unsigned
int to access them in parallel. Makes for a tidier spec_merge, and one
less headache.
