[spirv-reader] Fix OpSDiv operand and result signedness

(I expect that) the WGSL signed division operator expects both operands
to be signed and the result will also be signed.

When the operands of a SPIR-V OpSDiv is unsigned, then wrap
the operand in an as-cast to the corresponding signed type.

When the result type of a SPIR-V OpSDiv instruction is unsigned,
we have to wrap the generated WGSL operator with an as-cast to
that unsigned type.

This first CL addresses OpSDiv.  We'll address other operations in future CLs.

Bug: tint:3
Change-Id: If3849ceb44b21db87c1efd2c6a2cd63c6d648c88
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/19800
Reviewed-by: dan sinclair <dsinclair@google.com>
4 files changed
tree: ab98a68086a0a261f84799d2e32558668cfa0d41
  1. .clang-format
  2. .gitignore
  3. .gn
  4. BUILD.gn
  5. CMakeLists.txt
  6. CODE_OF_CONDUCT.md
  7. CONTRIBUTING.md
  8. CPPLINT.cfg
  9. DEPS
  10. Doxyfile
  11. LICENSE
  12. README.md
  13. build_overrides/
  14. fuzz/
  15. samples/
  16. src/
  17. standalone.gclient
  18. test/
  19. third_party/
  20. tint_overrides_with_defaults.gni
  21. tools/
README.md

Tint

Tint is a compiler for the WebGPU Shader Language (WGSL).

This is not an officially supported Google product.

Requirements

  • Git
  • CMake (3.10.2 or later)
  • Ninja (or other build tool)
  • Python, for fetching dependencies
  • depot_tools in your path

Build options

  • TINT_BUILD_SPV_READER : enable the SPIR-V input reader (off by default)
  • TINT_BUILD_WGSL_READER : enable the WGSL input reader (on by default)
  • TINT_BUILD_SPV_WRITER : enable the SPIR-V output writer (on by default)
  • TINT_BUILD_WGSL_WRITER : enable the WGSL output writer (on by default)

Building

Tint uses Chromium dependency management so you need to install depot_tools and add it to your PATH.

Getting source & dependencies

# Clone the repo as "tint"
git clone https://dawn.googlesource.com/tint tint && cd tint

# Bootstrap the gclient configuration
cp standalone.gclient .gclient

# Fetch external dependencies and toolchains with gclient
gclient sync

Compiling using CMake + Ninja

mkdir -p out/Debug
cd out/Debug
cmake -GNinja ../..
ninja # or autoninja

Compiling using CMake + make

mkdir -p out/Debug
cd out/Debug
cmake ../..
make # -j N for N-way parallel build

Issues

Please file any issues or feature requests at https://bugs.chromium.org/p/tint/issues/entry

Contributing

Please see the CONTRIBUTING and CODE_OF_CONDUCT files on how to contribute to Tint.