We already have search_pre_hashed. This makes the APIs match better.
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
When performing common subexpression elimination on instructions with
non-null destinations we emit a MOV to copy the result to a new
register that must have no other uses. In the case of:
cmp.g.f0.0(8) null:D, vgrf43:F, 0.500000f
...
cmp.g.f0.0(8) vgrf113:D, vgrf43:F, 0.500000f
we put the first instruction in the AEB and decided that we could reuse
its result when we found the second. Unfortunately, that meant that we'd
emit a MOV from the first's destination, which is null.
Don't do anything if the entry's destination is null and the
instruction's destination is non-null.
Tested-by: Tapani Pälli <tapani.palli@intel.com>
Just use the abs source modifier on both of the multiplicand
arguments.
instructions in affected programs: 300 -> 296 (-1.33%)
Reviewed-by: Kristian Høgsberg <krh@bitplanet.net>
Just use the negation source modifier on one of the multiplicand
arguments.
total instructions in shared programs: 5889529 -> 5880016 (-0.16%)
instructions in affected programs: 600846 -> 591333 (-1.58%)
Reviewed-by: Kristian Høgsberg <krh@bitplanet.net>
Without the break, it was possible that an instruction would match multiple
expressions. If this happened, you could end up trying to replace it
multiple times and get a segfault. This makes it so that, after a
successful replacement, it moves on to the next instruction.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
This refactor allows you to more easily get the deref node associated with
a given variable. We then use that new functionality in the
deref_may_be_aliased function instead of creating a 1-element deref chain.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
The original name wasn't particularly descriptive. This one indicates that
it actually gives you SSA values as opposed to the old pass which lowered
variables to registers.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
This solves a number of problems. First is the ability to change the
number of sources that a texture instruction has. Second, it solves the
delema that may occur if a texture instruction has more than 4 sources.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
Additional description was added to a variety of places. Also, we no
longer use the term "leaf" to describe fully-qualified direct derefs.
Instead, we simply use the term "direct" or spell it out completely.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
This should be much better for debugging as GDB will pick up on the fact
that it's an enum and actually tell you what you're looking at instead of
giving you some arbitrary hex value you have to go look up.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
This should make debugging a lot easier as GDB handles static inlines much
better than macros. Also, static inlines are typesafe.
Reviewed-By: Glenn Kennard <glenn.kennard@gmail.com>
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
This was a left-over relic of GLSL IR that we aren't using for anything.
If we ever want that value again, we can add it back, but NIR constant
folding should be just as good as GLSL IR's if not better pretty soon, so
I'm not worried about it.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
Previously, our variable renaming algorithm, while similar to the one in
the Cytron paper, was not the same. While I'm pretty sure it was correct,
it will be easier for readers of the code in the variable renaming pass if
it follows more closely. This commit removes the automatic stack popping
we were doing and replaces it with explicit popping like Cytron does.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
This commit seeks to make the lower_variables pass much more clear by
adding a pile of comments and re-arranging a few things. There are no
functional or algorithmic changes.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
parallel_copy_copy was a silly name. Also, things were getting long and
annoying, so I added a foreach macro. For historical reasons, several of
the original iterations over parallel copy entries in from_ssa used the
_safe variants of the loop. However, all of these no longer ever remove an
entry so it's ok to make them all use the normal iterator.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
Previously, we were doing a lazy creation of the parallel copy
instructions. This is confusing, hard to get right, and involves some
extra state tracking of the copies. This commit adds an extra walk over
the basic blocks to add the block-end parallel copies up front. This
should be much less confusing and, consequently, easier to get right. This
commit also adds more comments about parallel copies to help explain what
all is going on.
As a consequence of these changes, we can now remove the at_end parameter
from nir_parallel_copy_instr.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
Before, we were emitting the full pile of setup instructions for sample_id
and sample_pos every time they were used. With this commit, we emit them
in their own pass once at the beginning of the shader and simply emit uses
later on. When it comes time for setting up VS, we can put setup for its
special values in the same pass.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
Originally, this field was intended for determining if the given
instruction acted per-component or if it had mismatching source and
destination sizes that would have to be interpreted specially. However, we
can easily derive this from output_size == 0, so it's not really that
useful. Also, the values we were setting in nir_opcodes.h for this field
were completely bogus and it was never used.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
Prior to this commit, we had a big switch statement for this. Now it's
baked into the opcode metadata so we can just use that.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
This commit adds some algebraic properties to the metadata of each opcode
in NIR. In particular, you now know, just from the metadata, if a given
opcode is commutative or associative. This will be useful for algebraic
transformation passes that want to be able to match a + b as well as b + a
in one go.
v2: Make algebraic properties all caps. This was more consistent with the
intrinsics flags and seems better for flags in general.
Also, the enums are now declared with (1 << n) rather then hex values.
v3: fmin and fmax technically aren't commutative or associative. Things
get funny when one of the arguments is a NaN.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
As it was, we weren't ever using load_const in a non-SSA way. This allows
us to substantially simplify the load_const instruction. If we ever need a
non-SSA constant load, we can do a load_const and an imov.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
Previously, lower_atomics was non-SSA only. We assert-failed if the
destination of an atomic operation intrinsic was an SSA def and we used
temporary registers for computing offsets. This commit changes both of
these behaviors. We now use SSA values for computing offsets (so we can
optimize them) and we handle SSA destinations. We also move the pass to
run before we go out of SSA on i965 as it now generates SSA values.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
Before, we were using foreach_dest and switching on whether the destination
was an SSA value. This works, except not all destinations are SSA values
so we have to special-case ssa_undef instructions. Now that we have a
foreach_ssa_def function, we can iterate over all of the register
destinations in one pass and iterate over the SSA destinations in a second.
This way, if we add other ssa-only instructions, we won't have to worry
about adding them to the special case we have for ssa_undef.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
There are some functions whose destinations are SSA-only and so aren't a
nir_dest. This provides a function that is capable of iterating over the
SSA definitions defined by those functions. If you want registers, you
should use the old iterator.
v2: Kenneth Graunke <kenneth@whitecape.org>:
- Fix nir_foreach_ssa_def's return value.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
Previously, we were just iterating over the program "in order" which
kind-of approximates a DFS, but not really. In particular, we got the
following case wrong:
loop {
a = 3;
if (foo) {
a = 5;
} else {
break;
}
use(a);
}
where use(a) would get 3 instead of 5 because of premature popping of the
SSA def stack. Now, since we do an actaul DFS, we should evaluate use(a)
immediately after a = 5 and we should be ok.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
We stopped generating predicates in glsl_to_nir some time ago. Right now,
it's all dead untested code that I'm not convinced always worked in the
first place. If we decide we want them back, we can revert this patch.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
Previously, the condition was a scalar that applied to all components
simultaneously. As of this commit, the condition is a vector and each
component is switched seperately.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
nir_metadata_dirty was a terrible name because the parameter it takes is
the metadata to be preserved. This is really confusing because it looks
like it's doing the opposite of what it is actually doing. Now it's named
sensibly.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
v2 Jason Ekstrand <jason.ekstrand@intel.com>:
- Use the nir_tex_src_sampler_offset source type instead of the
sampler_indirect thing that I cooked up before.
Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>
v2 Jason Ekstrand <jason.ekstrand@intel.com>:
- Use the nir_tex_src_sampler_offset source type instead of the
sampler_indirect thing that I cooked up before.
Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>
In particular, we rename nir_tex_src_sampler_index to _sampler_offset and
add a sampler_array_size field to nir_tex_instr. This way we can pass the
size of sampler arrays through to backends even after removing the variable
information and, with it, the type.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
In GLSL-to-NIR we were just setting the base index to 0 whenever there was
an indirect so having it expressed as a sum makes no sense. Also, while a
base offset may make sense for the memory location (first element in the
array, etc.) it makes less sense for the actual uniform buffer index. This
may change later, but it seems to make more sense for now.
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
Jason Ekstrand
Matt Turner