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* #include an absolute path didn't work - because paths were taken to always be relative.
* Refactor how prelude output works in emit.
* Small improvement to emit output.
* Move around comment on target specific language directives based on review.
Co-authored-by: Theresa Foley <10618364+tangent-vector@users.noreply.github.com>
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* #include an absolute path didn't work - because paths were taken to always be relative.
* Refactor Liveness pass, such that locations can be found independently of setting up ranges.
* Refactor around different stages of liveness span analysis.
* WIP Take into account PHI temporaries in liveness tracking.
* WIP First pass of PHI liveness refactor.
* Add BlockIndex.
* WIP Refactor phi liveness around inst runs.
* More improvements around liveness tracking.
* Bug fixes.
Special handling to not add multiple ends, at starts of blocks and after accesses.
* Fix test output.
* Use IRInsertLoc to track insertion point.
* Liveness markers don't have side effects.
* Fix typo in liveness test.
* Small improvements around setting SuccessorResult.
* Fix memory issue around reallocation and RAIIStackArray.
Update test output.
* Update test output for liveness.slang.
* Fix typo in SuccessorResult blockIndex.
* Small tidy up.
* Handle the root start block, correctly scoping the run.
* Split BlockInfo into 'Root' and 'Function'.
Store successors as BlockIndices.
* Tidy up around liveness tracking.
* Add head/tail support to ArrayViews.
Use Count where appropriate.
Use head/tail in liveness impl.
* Special handling if return is effectively a live variable.
* Update test output for improved return handling.
* Refactor how handling of return accesses.
Fix issue around liveness starts.
* Disable release warning for unused method.
* Some small improvements around liveness pass.
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* #include an absolute path didn't work - because paths were taken to always be relative.
* Refactor Liveness pass, such that locations can be found independently of setting up ranges.
* Refactor around different stages of liveness span analysis.
* WIP Take into account PHI temporaries in liveness tracking.
* WIP First pass of PHI liveness refactor.
* Add BlockIndex.
* WIP Refactor phi liveness around inst runs.
* More improvements around liveness tracking.
* Bug fixes.
Special handling to not add multiple ends, at starts of blocks and after accesses.
* Fix test output.
* Use IRInsertLoc to track insertion point.
* Liveness markers don't have side effects.
* Fix typo in liveness test.
* Small improvements around setting SuccessorResult.
* Fix memory issue around reallocation and RAIIStackArray.
Update test output.
* Update test output for liveness.slang.
* Fix typo in SuccessorResult blockIndex.
* Small tidy up.
* Handle the root start block, correctly scoping the run.
* Split BlockInfo into 'Root' and 'Function'.
Store successors as BlockIndices.
* Tidy up around liveness tracking.
* Add head/tail support to ArrayViews.
Use Count where appropriate.
Use head/tail in liveness impl.
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Co-authored-by: Yong He <yhe@nvidia.com>
Co-authored-by: Theresa Foley <10618364+tangent-vector@users.noreply.github.com>
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* #include an absolute path didn't work - because paths were taken to always be relative.
* Update SPIR-V headers/opt.
Update glslang.
* Set the SPIR-V emit version.
* Use the merged hash from shader-slang/glslang
* Improve comment around spirv version for emitting spir-v directly.
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* #include an absolute path didn't work - because paths were taken to always be relative.
* Add SPIRVLiteralType, to mark types that have spirv_literal in function parameter output.
* Update test result.
Co-authored-by: Theresa Foley <10618364+tangent-vector@users.noreply.github.com>
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* Use IR pass to eliminate phi nodes
"Phi nodes" are one of the key contrivances that makes SSA (Static
Single Assignment) form work. Because SSA is so great for compiler
IRs, we kind of need to deal with phi nodes, but they also get in
the way because they don't have a direct analog in most lower-level
machine ISAs or execution models, nor in most of the high-level
languages a transpiler wants to emit. As a result a compiler like
ours needs to be able to eliminate the phi nodes from a program as
part of generating output code.
(For any clever people noting that SPIR-V supports phi nodes
directly: yes, it does. It doesn't need to and it probably *shouldn't*.
Anybody involved in the decision-making knows my reasoning, and
anybody else should feel free to ask me if they want the lecture.
Anyway...)
The basic idea of elimiating phi nodes is simple enough. We replace
each phi node with a temporary variable. Uses of the phi use values
loaded from the temporary. The operation of the phi itself
(assigning a value based on the branch taken) amounts to an assignment
into the temporary.
Previously, the Slang compiler dealt with phi nodes very late in
the process of generating code: in the middle of emitting strings
of source code in a high-level language like HLSL or GLSL. Doing the
work that late in compilation has two big drawbacks:
1. Our ability to emit clean and/or optimal code is limited because
we may not be able to make certain changes to the IR, or because we
cannot make use of additional information like a dominator tree that
might be available at other points in compilation.
2. Any other IR passes that relate to temporary variables won't be
able to see the variables that we generate for phi nodes. This could
raise issues with correctness (e.g., if we want to compute live-range
information for *all* temporary variables), or performance (we have no
way to run additional IR optimization passes after phis are eliminated).
This change addresses these problems by making the elimination of
phi nodes an explicit IR pass. Additional optimizations can easily be
run after this pass (although we'd need to be careful not to run
passes that could end up introducing new phis). The pass makes use
of the information available to it to try to produce code that will
emit to "clean" HLSL/GLSL.
The core of the pass is in `slang-ir-eliminate-phis.cpp`, and is
heavily commented, so I won't describe the approach in detail here.
There are two related issues that came up, though:
First, it turned out that our emit logic for local variables (`IRVar`
instructions) wasn't using the function we'd defined named `emitVar()`.
One worrying consequence of that oversight was that the `precise`
modifier would impact generated HLSL/GLSL for variables that turned
into SSA values (including phi nodes), but *not* for local variables
that had not been SSA'd (or that had been SSA'd and then de-SSA'd).
This change also fixes that bug; it is unclear how widespread the
impact of the original issue might be.
Second, generating explicit IR temporaries for phi nodes exposed a
pre-existing bug in the `slang-ir-restructure-scoping` pass. That pass
basically detects cases where we have an instruction `I` with a use
`U` such that the use follows the rules of SSA form ("def dominates
use," meaning `I` dominations `U`), but does not follow the more
restrictive scoping rules of high-level-language output (where a value
computed "inside" a loop is not automatically visible to code outside
the loop just because it dominates that code). That pass did not
correctly account for the case where `I` was a temporary variable.
It seems that case could not arise before now because we didn't have
any passes that would move `var`, `load`, or `store` operations out
of the basic block they started in. The fix for that pass was relatively
simple, and will make the whole thing more robust in case we add more
aggressive optimizations later.
* fixup: expected test output
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* #include an absolute path didn't work - because paths were taken to always be relative.
* Fix for loops within dominator tree.
Fix for functions that have no body.
* Use a count array.
Update some comments.
* Special case handling of the root block, for searching for last access.
* Enable liveness test with glsl output.
Co-authored-by: Theresa Foley <10618364+tangent-vector@users.noreply.github.com>
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* #include an absolute path didn't work - because paths were taken to always be relative.
* Allow rate modifier on parameter.
* Add test.
* Disable test for now as breaks on source comparison because around nvAPI.
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* #include an absolute path didn't work - because paths were taken to always be relative.
* Add support for HLSL `export`.
* Test for using `export` keyword.
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* Various vulkan/glsl fixes.
* Fix.
* Fix.
* Canonicalize type constraints for name mangling.
Co-authored-by: Yong He <yhe@nvidia.com>
Co-authored-by: Theresa Foley <10618364+tangent-vector@users.noreply.github.com>
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* #include an absolute path didn't work - because paths were taken to always be relative.
* WIP tracking liveness.
* Skeleton around adding liveness instructions.
* Calling into liveness tracking logic.
Adds live start to var insts.
* Liveness macros have initial output.
* Looking at different initialization scenarios.
* Some discussion around liveness.
* WIP for working out liveness end.
* WIP Updated liveness using use lists.
* Is now adding liveness information
* Some small fixes.
* WIP around liveness.
* Seems to output liveness correctly for current scenario.
* Tidy up liveness code.
* Update comment arounds liveness to current status.
* Small fixes to liveness test.
* Add support for call in liveness analysis.
* Improve liveness example with array access.
* Small updates to comments.
* Disable liveness test because inconsistencies with output on CI system.
* First pass support for GLSL SPIR-V liveness support.
* Add the SPIRVOpDecoration.
* Fix signature for OpLivenessStop.
* Simplified by having a Kind type.
* Fix some issues brought up in PR.
* Rename liveness instructions.
* Merge with var-lifetime.
Small improvements.
* Improvements to the documentation/naming in GLSL liveness pass.
Add comment around possible improvements to the liveness pass.
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* #include an absolute path didn't work - because paths were taken to always be relative.
* WIP tracking liveness.
* Skeleton around adding liveness instructions.
* Calling into liveness tracking logic.
Adds live start to var insts.
* Liveness macros have initial output.
* Looking at different initialization scenarios.
* Some discussion around liveness.
* WIP for working out liveness end.
* WIP Updated liveness using use lists.
* Is now adding liveness information
* Some small fixes.
* WIP around liveness.
* Seems to output liveness correctly for current scenario.
* Tidy up liveness code.
* Update comment arounds liveness to current status.
* Small fixes to liveness test.
* Add support for call in liveness analysis.
* Improve liveness example with array access.
* Small updates to comments.
* Disable liveness test because inconsistencies with output on CI system.
* Fix some issues brought up in PR.
* Rename liveness instructions.
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* Fix errors when building with the latest Xcode
* Bring back unused variable to better match comments
Co-authored-by: jsmall-nvidia <jsmall@nvidia.com>
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As part of generating high-level-language code, we have a pass that
builds a data structure representing structured control-flow `Region`s
and their nesting relationship. That data structure is then used
when emitting control-flow statements for the body of a function.
There are `Region` subtypes coresponding to different kinds of control
flow constructs. Both the `IfElseRegion` and `SwitchRegion` subtypes
were implemented to store a reference to the branch condition direclty
in the `Region`. This turns out to be the root cause of the problem.
After the nested `Region` structure is constructed, we have an IR pass
that uses the region hierarchy to detect and fix problems where the
implicit "scoping" rules of SSA form are incompatible with the scoping
rules that will be in effect when those regions are emitted as
high-level-language control-flow statements.
A bug arose when one of the SSA values that required the scoping fix
was the branch condition of an `if` statement. While the IR pass did
what it was supposed to and replaced the operand to the `IRIfElse`
instruction, doing so did not change the cached condition in the
corresponding `IfElseRegion`, and thus didn't effect the way code
got emitted for the `if(...)` condition in HLSL.
The fix here is simple: the relevant `Region` subtypes now store a
pointer to the relevant control-flow instruction rather than to
the branch condition. The emit logic can thus fetch the correct
condition from the control-flow instruction at the time it emits an
`if` or `switch`.
Note: We do not need to have the same worries around the `IRIfElse`
or `IRSwitch` instructions, nor for the `IRBlock`s that the `Region`s
still store. The passes that come after the `Region`s get created are
not supposed to alter the CFG in any way, because otherwise they would
risk changing/invalidating the `Region` structure.
Similarly, this change doesn't modify the `IRInst`s refernced in the
`Case`s for a `SwitchRegion` under the assumption that these must
always be literal integer constants, and thus cannot be changed out.
Co-authored-by: jsmall-nvidia <jsmall@nvidia.com>
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* #include an absolute path didn't work - because paths were taken to always be relative.
* Disable class keyword.
* Add class keyword test.
* Fix test diagnostic.
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* #include an absolute path didn't work - because paths were taken to always be relative.
* Compile to a dxil library.
* Added CompileProduct.
* Support handling of ModuleLibrary.
* CacheBehavior -> Cache
* Use CompileProduct for -r references.
* CompileProduct -> Artifact.
* Determining an artifact type on binding.
* Determine binary linkability.
* Added Artifact::exists.
* Added ArtifactKeep.
* Small fixes.
* Small improvements to Artifact.
* Add zip extension.
* Fix some comments.
* Fix multiple adding of PublicDecoration.
Make public output export for DXIL/lib.
Add checking for simpleDecorations such that only added once.
* Use 'whole program' to identify library build.
* Move slang-artifact into compiler-core.
* Split out Keep free functions.
* Artifact::Keep -> ArtifactKeep.
* Handle libraries as artifacts.
* Add -target dxil so test infrastructure knows it needs DXC.
* Linking working in DXC.
* Improve handling around emit for 'export'.
* Add comment around Artifact name.
* Render test working with linking.
* Improvements around Artifact handling.
* Add ArtifactPayloadInfo.
* Small tidy up around artifact.
* Split out code to get info about Artifacts into artifact-info.cpp/.h
* IArtifact interface and IArtifactInstance interface.
* Fix small issues.
* Fix compilation warning issue.
* Fix missing SLANG_OVERRIDE.
* Small fixes to make compilation work on Visual Studio 2022.
* Small improvements to Artifact interface/naming.
* Added Desc with each element in IArchive to allow more flexibility in usage.
* Fix clang warning issue.
* Add ArtifactPayload::Diagnostics
* More discussion around IArtifact usage.
* Re-add slang-artifact.h which was removed during merge.
* Fix typo identified in review.
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* #include an absolute path didn't work - because paths were taken to always be relative.
* Compile to a dxil library.
* Added CompileProduct.
* Support handling of ModuleLibrary.
* CacheBehavior -> Cache
* Use CompileProduct for -r references.
* CompileProduct -> Artifact.
* Determining an artifact type on binding.
* Determine binary linkability.
* Added Artifact::exists.
* Added ArtifactKeep.
* Small fixes.
* Small improvements to Artifact.
* Add zip extension.
* Fix some comments.
* Fix multiple adding of PublicDecoration.
Make public output export for DXIL/lib.
Add checking for simpleDecorations such that only added once.
* Use 'whole program' to identify library build.
* Move slang-artifact into compiler-core.
* Split out Keep free functions.
* Artifact::Keep -> ArtifactKeep.
* Handle libraries as artifacts.
* Add -target dxil so test infrastructure knows it needs DXC.
* Linking working in DXC.
* Improve handling around emit for 'export'.
* Add comment around Artifact name.
* Render test working with linking.
* Improvements around Artifact handling.
* Add ArtifactPayloadInfo.
* Small tidy up around artifact.
* Split out code to get info about Artifacts into artifact-info.cpp/.h
* Re-add slang-artifact.cpp
* Readd artifact.cpp.
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* #include an absolute path didn't work - because paths were taken to always be relative.
* Compile to a dxil library.
* Added CompileProduct.
* Support handling of ModuleLibrary.
* CacheBehavior -> Cache
* Use CompileProduct for -r references.
* CompileProduct -> Artifact.
* Determining an artifact type on binding.
* Determine binary linkability.
* Added Artifact::exists.
* Added ArtifactKeep.
* Small fixes.
* Small improvements to Artifact.
* Add zip extension.
* Fix some comments.
* Fix multiple adding of PublicDecoration.
Make public output export for DXIL/lib.
Add checking for simpleDecorations such that only added once.
* Use 'whole program' to identify library build.
* Move slang-artifact into compiler-core.
* Split out Keep free functions.
* Artifact::Keep -> ArtifactKeep.
* Handle libraries as artifacts.
* Add -target dxil so test infrastructure knows it needs DXC.
* Linking working in DXC.
* Improve handling around emit for 'export'.
* Add comment around Artifact name.
* Render test working with linking.
* Improvements around Artifact handling.
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* #include an absolute path didn't work - because paths were taken to always be relative.
* Compile to a dxil library.
* Added CompileProduct.
* Support handling of ModuleLibrary.
* CacheBehavior -> Cache
* Use CompileProduct for -r references.
* CompileProduct -> Artifact.
* Determining an artifact type on binding.
* Determine binary linkability.
* Added Artifact::exists.
* Added ArtifactKeep.
* Small fixes.
* Small improvements to Artifact.
* Add zip extension.
* Fix some comments.
* Fix multiple adding of PublicDecoration.
Make public output export for DXIL/lib.
Add checking for simpleDecorations such that only added once.
* Use 'whole program' to identify library build.
* Move slang-artifact into compiler-core.
* Split out Keep free functions.
* Artifact::Keep -> ArtifactKeep.
* Handle libraries as artifacts.
* Add -target dxil so test infrastructure knows it needs DXC.
* Linking working in DXC.
* Improve handling around emit for 'export'.
* Add comment around Artifact name.
* Render test working with linking.
Co-authored-by: Theresa Foley <10618364+tangent-vector@users.noreply.github.com>
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* #include an absolute path didn't work - because paths were taken to always be relative.
* Fix for overloaded name lookup.
* Small improvements.
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parameter on GLSL. (#2207)
Improved the trace-ray-inline test to check that the flag is not ignored anymore.
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* #include an absolute path didn't work - because paths were taken to always be relative.
* Compile to a dxil library.
* Added CompileProduct.
* Support handling of ModuleLibrary.
* CacheBehavior -> Cache
* Use CompileProduct for -r references.
* CompileProduct -> Artifact.
* Determining an artifact type on binding.
* Determine binary linkability.
* Added Artifact::exists.
* Added ArtifactKeep.
* Small fixes.
* Small improvements to Artifact.
* Add zip extension.
* Fix some comments.
* Fix multiple adding of PublicDecoration.
Make public output export for DXIL/lib.
Add checking for simpleDecorations such that only added once.
* Use 'whole program' to identify library build.
* Add -target dxil so test infrastructure knows it needs DXC.
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* Make translation unitts in the same CompileReq visible to `import`.
* Fix code review comments.
Co-authored-by: Yong He <yhe@nvidia.com>
Co-authored-by: Theresa Foley <10618364+tangent-vector@users.noreply.github.com>
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* #include an absolute path didn't work - because paths were taken to always be relative.
* Compile to a dxil library.
* Added CompileProduct.
* Support handling of ModuleLibrary.
* CacheBehavior -> Cache
* Use CompileProduct for -r references.
* CompileProduct -> Artifact.
* Determining an artifact type on binding.
* Determine binary linkability.
* Added Artifact::exists.
* Added ArtifactKeep.
* Small fixes.
* Small improvements to Artifact.
* Add zip extension.
* Fix some comments.
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* Fixed the callable shader payload type for GLSL.
* Added location parameters to the __vulkanRayPayload and __vulkanCallablePayload attributes.
The default value is -1 which means use the old auto-assignment logic.
* Fixed the vkray/callable-caller test.
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* Support `[DllImport]`
* Fix.
* Fix.
* Fix array type emit in cpp.
* Fix.
* Fix.
* Fix
Co-authored-by: Yong He <yhe@nvidia.com>
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An earlier refactoring pass over the compiler codebase split the
type that had been called `CompileRequest` into three distinct
pieces:
* `FrontEndCompileRequest` which was supposed to own state and
options related to running the compiler front end and producing
IR + reflection (e.g., what translation units and source
files/strings are included).
* `BackEndCompileRequest` which was supposed to own state and options
related to running the compiler back end to translate the IR
for a `ComponentType` (program) into output code. (Note that the
`BackEndCompileRequest` was conceived of as orthogonal to the
`TargetRequest`s, which store per-target and target-specific
options.)
* `EndToEndCompileRequest` which was an umbrella object that owns
separate front-end and back-end requests, plus any state that is
only relevant when doing a true end-to-end compile (such as the
kinds of compiles initiated with `slangc`). As originally conceived,
the only state that this type was supposed to own was stuff related
to "pass-through" compilation, as well as state related to writing
of generated code to output files.
That refactoring work was very useful at the time, because it allowed
us to "scrub" the back end compilation steps to remove all
dependencies on front-end and AST state (this was important for our
goals of enabling linking and codegen from serialized Slang IR).
At this point, however, it is clear that the hierarchy that was built
up serves very little purpose:
* The `BackEndCompileRequest` type is only used in two places:
* As part of an `EndToEndCompileRequest`, where the settings on
the `BackEndCompileRequest` can be configured, but only through
the `EndToEndCompileRequest`
* As part of on-demand code generation through the `IComponentType`
APIs. In this case, the settings stored on the
`BackEndCompileRequest` are not accessible to the application
at all, and will always use their default values, so that
instantiating a "request" object doesn't really make any sense.
* The `FrontEndCompileRequest` type has a similar situation:
* Front-end compilation as part of an `EndToEndCompileRequest`
supports user configuration of `FrontEndCompileRequest` settings,
but only through the `EndToEndCompileRequest`
* Front-end compilation triggered by an `import` or a `loadModule()`
call does not support user configuration of settings at all. It
will always derive all relevant settings from thsoe on the
session ("linkage").
In addition, subsequent changes have been made to the compiler that
show a bit of a "code smell" and/or forward-looking worries for this
decomposition:
* In some cases we've had to add the same setting to multiple types
in the breakdown (front-end, back-end, end-to-end, linkage, target,
etc.) which makes it harder for us to validate that all the possible
mixtures of state work correctly.
* Related to the above, in some cases we have manual logic that copies
state from one of the objects in the breakdown to another, in order
to ensure that the user's intention is actually followed.
* As a forward-looking concern, it seems that developers have sometimes
added new configuration options and state to places that don't really
make sense according to the rationale of the original decomposition
(e.g., we probably don't want to have a lot of state that is only
available via end-to-end requests, given that the API structure is
meant to push users *away* from end-to-end compiles).
As a result of all of the above, I've been planning a large refactor
with the following big-picture goals:
* Eliminate `BackEndCompileRequest`
* Move all relevant state/options from the back-end request to
the end-to-end request, since that is the only place they could
be set anyway.
* Introduce a transient "context" type to be used for the duration
of code generation that serves the main functions that back-end
requests really served in the codebase
* Make `EndToEndCompileRequest` be a subclass of
`FrontEndCompileRequest`
* Consider addding a transient "context" type for front-end
compiles that can be used in `import`-like cases rather than
needing a full front-end request object. If this works, then
eliminate `FrontEndCompileRequest` and be back to world with
just a single `CompileRequest` type
* Move *all* compiler configuration options to a distinct type (named
something like `CompilerConfig` or `CompilerOptions` or whatever)
which stores setting as key-value pairs, and has a notion of
"inheritance" such that one configuration can extend or build on top
of another. Make all the relevant types use this catch-all structure
instead of redundantly storing flags in many places.
This change deals with the first of those bullets: removeal of
`BackEndCompileRequest`. The addition of the `CodeGenContext` type is
perhaps an unncessary additional step, but making that change helps
clean up a bunch of the code related to per-target code generation,
so I think it is the right choice.
Co-authored-by: Yong He <yonghe@outlook.com>
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* Fixed the mapping of the *InstanceID() and *InstanceIndex() functions to GLSL.
* Fixed and somewhat improved the vkray/closesthit test.
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* #include an absolute path didn't work - because paths were taken to always be relative.
* Added sample-grad-clamp-lod sample.
* Fix handling multiple reopenings of namespaces.
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* #include an absolute path didn't work - because paths were taken to always be relative.
* Meta-2 test works.
* Add new generic test for static const variable in a function in a generic.
* Generic function with static const variable doesn't work.
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Improved the type printing function to include the generic substitutions and parent types.
Added a test for it, mismatching-types.slang
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* #include an absolute path didn't work - because paths were taken to always be relative.
* Fix for = {} initialization with a field that is generic type parameter.
* Handling for if a non type is passed to a generic parameter which requires a type.
* Small comment improvements.
Fix some tab issues.
* This fixes the matrix.slang issue. Move the matrix.slang test into bugs as generic-default-matrix.slang
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* #include an absolute path didn't work - because paths were taken to always be relative.
* Split doc extractor such that can be used in C++ extractor.
* Compiles. Update the stdlib docs.
* Fix issue on release builds.
* Add support for extracting documentation to C++ extractor.
* Dump out markup.
Make enum value backing type take tokens.
* Node::Type -> Node::Kind
* More improvements around Node::Type -> Node::Kind
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* Pass through the downstream compiler error messages if they are not recognized.
* Added a help message that is printed on -h, -help, --help.
Added -version as an alias for -v.
* Fixed the bug in -lang option processing.
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* Use SlangResult value. Make legacy SLANG_ERROR_ macros use SlangResult values.
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`ImageSubscript` for GLSL (#2146)
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Co-authored-by: Yong He <yhe@nvidia.com>
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* Various gfx fixes.
* Fix test case.
* Fix crash.
* Trigger build
* Trigger build 2
* Fix vulkan unit tests.
Co-authored-by: Yong He <yhe@nvidia.com>
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Co-authored-by: Yong He <yhe@nvidia.com>
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* Various fixes to gfx.
* Fix.
* Fixes.
* Fix.
* gfx: support root parameter via user-defined attribute.
* Fix.
* Fix.
* Skip d3d12 tests on win x86.
* Fixes.
* gfx: support shader record overwrite.
* Fix QueyPool implementation.
* Rename to `getBindingRangeLeafVariable`
Co-authored-by: Yong He <yhe@nvidia.com>
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* Various fixes to gfx.
* Fix.
* Fixes.
* Fix.
* gfx: support root parameter via user-defined attribute.
* Fix.
* Fix.
* Skip d3d12 tests on win x86.
* Fixes.
Co-authored-by: Yong He <yhe@nvidia.com>
Co-authored-by: jsmall-nvidia <jsmall@nvidia.com>
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* Various fixes to gfx.
* Fix.
* Fixes.
* Fix.
Co-authored-by: Yong He <yhe@nvidia.com>
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