This change is responsible for avoiding the replacement of constant
operands with another one not constant, in the context of atomic
operations. The related rule from the SPIR-V spec is: "All used for
Scope and Memory Semantics in shader capability must be of an
OpConstant."
Fixes#4346.
This is based on a legacy commit which installs a local grammar. A
followup commit will change to the grammar in SPIRV-Headers.
Co-authored-by: baldurk <baldurk@baldurk.org>
This change allows spriv-reduce to get rid of a selection, switch or
loop construct if none of the instructions defined in the construct
are used outside the construct.
The new pass will removed interface variable on the OpEntryPoint instruction when they are not statically referenced in the call tree of the entry point.
It can be enabled on the command line using the options `remove-unused-interface-variables`.
This change allows the reducer to merge together blocks even when they
are unreachable, but keeps the restriction of reachability in place
for the optimizer.
Fixes#4302.
There was a lot of code in the codebase that would get the dominator
analysis for a function and then use it to check whether a block is
reachable. In the fuzzer, a utility method had been introduced to make
this more concise, but it was not being used consistently.
This change moves the utility method to IRContext, so that it can be
used throughout the codebase, and refactors all existing checks for
block reachability to use the utility method.
Cleans up a CMakeLists.txt file and the header guard for a reduction
opportunity, and gets rid of an unnecessary parent function field that
can be derived from an existing block field.
* Initial support for SPV_KHR_integer_dot_product
- Adds new operand types for packed-vector-format
- Moves ray tracing enums to the end
- PackedVectorFormat is a new optional operand type, so it requires
special handling in grammar table generation.
- Add SPV_KHR_integer_dot_product to optimizer whitelists.
- Pass-through validation: valid cases pass validation
Validation errors are not checked.
- Update SPIRV-Headers
Patch by David Neto <dneto@google.com>
Rebase and minor tweaks by Kevin Petit <kevin.petit@arm.com>
Signed-off-by: David Neto <dneto@google.com>
Signed-off-by: Kevin Petit <kevin.petit@arm.com>
Change-Id: Icb41741cb7f0f1063e5541ce25e5ba6c02266d2c
* format fixes
Change-Id: I35c82ec27bded3d1b62373fa6daec3ffd91105a3
Fixes#4170, by checking the signedness of bitwise operands in
TransformationAddBitInstructionSynonym, to avoid an "Expected Base
Type to be equal to Result Type" validation error.
PR #4118 (d71ac38b8e) let spirv-val report a validation error when we
use offset for an OpImage* instruction instead of ConstantOffset. Since
some compilers like DXC rely on spirv-opt for function inlining or loop
unrolling, the spirv-val change broke some working shaders when the
shader developers disable the optimization (spirv-opt).
For example, DXC recently got this issue from a few users e.g.,
https://github.com/microsoft/DirectXShaderCompiler/issues/3807
Since this error is reported only when the spirv-opt is disabled, it
looks like the exact case that we have to skip spirv-val when
`--before-legalize-hlsl` is given. Moreover, avoiding the error using
`--before-legalize-hlsl` on DXC is exactly what FXC and DXC's DXIL
do (they do not report the error if the offset becomes a constant after
function inlining or loop unrolling).
This change prevents TransformationOutlineFunction from outlining a
region of blocks if some block in the region has an unreachable
predecessor. This avoids a bug whereby the region would be outlined,
and the unreachable predecessors would be left behind, referring to
blocks that are no longer in the function.
The def-use manager was being incorrectly updated in
TransformationPermutePhiOperands, and this was causing future
transformations to go wrong during fuzzing. This change updates the
def-use manager in a correct manner, and adds a test exposing the
previous bug.
Fixes#4300.
Sometimes, you need to change these functions during debugging (e.g.,
figure out why the transformation is inapplicable). When that happens,
you need to recompile the whole fuzzer just because these functions
are in the header file. This PR fixes the situation.
Fixes https://crbug.com/tint/793
* When a loop has an empty loop construct, the loop construct and
continue construct share the same header so don't disallow the loop
header for the continue construct
Fix dangling phi bug from loop-unroll
When unrolling the following loop:
```
%const0 = OpConstant ...
%const1 = OpConstant ...
...
%LoopHeader = OpLabel
%phi0 = OpPhi %float %const0 %PreHeader %phi1 %Latch
%phi1 = OpPhi %float %const1 %PreHeader %x %Latch
...
%LoopBody = OpLabel
%x = OpFSub %float %phi1 %phi0
...
```
the loop-unroll pass sets the value of `%phi0` as `%phi1` for the second
copy of the loop body. For example, the second copy of
`%x = OpFSub %float %phi1 %phi0` will be
`%y = OpFSub %float %x %phi1`.
Since all phi instructions for inductions will are removed after the
loop unrolling, `%phi1` will be a dead dangling phi.
It happens only for the phi values of the first loop iteration. Replacing those
dangling phis with their initial values fixes this issue.
For example, the second copy of `%x = OpFSub %float %phi1 %phi0` should be
`%y = OpFSub %float %x %const1` because the value of `%phi1` from the
first loop iteration is `%const1`.
There are some edge cases where adding livesafe functions does not
succeed, due to loop limiter edges breaking SPIR-V dominance rules. As
these edge cases are rare it does not seem worth implementing complex
additional logic to handle all cases. This change accepts that trying
to add a function in a livesafe manner may not succeed.
This pass converts an internal form of GLSLstd450 Interpolate ops
to the externally valid form. The external form takes the lvalue
of the interpolant. The internal form can do a load of the interpolant.
The pass replaces the load with its pointer. The internal form is
generated by glslang and possibly other frontends for HLSL shaders.
The new pass is called as part of HLSL legalization after all
propagation is complete.
Also adds internal interpolate form to pre-legalization validation
FuzzerPassConstructComposites is adapted to use AvailableInstructions
to manage available instructions, and to use zero constants when
trying to construct a composite for which not all fields can otherwise
be constructed. The change uncovered some cases where we create
structs and arrays with struct fields or components that are
block-decorated; these possibilities have been eliminated.
It is easy to avoid the need to invalidate the def-use analysis and
instruction to block mapping when splitting blocks, and profiling has
revealed that invalidation of def-use in particular is expensive when
splitting many blocks. This change avoids these invalidations.
Profiling has shown that adding large numbers of dead block
transformations can be expensive because each on requires dominator
analysis information, and each one invalidates this information. There
is currently no obvious mechanism for incrementally updating the
dominator analysis. This change restricts the number of these
transformations that a single fuzzer pass will apply, to restrict this
performance bottleneck.
