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[naga]: Add no_std polyfill for round_ties_even for f32 and f64 #7585

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[naga]: Add no_std polyfill for round_ties_even for f32 and f64 #7585

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f7ed1ba
Rely on `libm` for a `no_std` alternative to `round_ties_even`
bushrat011899 Apr 21, 2025
17cef37
Update Cargo.toml
bushrat011899 Apr 30, 2025
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6 changes: 4 additions & 2 deletions .github/workflows/ci.yml
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Expand Up @@ -292,7 +292,7 @@ jobs:
cargo clippy --target ${{ matrix.target }} ${{ matrix.extra-flags }} -p wgpu-hal --all-features
cargo clippy --target ${{ matrix.target }} ${{ matrix.extra-flags }} -p wgpu --all-features

# Building for no_std platforms where every feature is enabled except "std".
# Building for no_std platforms.
- name: Check `no_std`
if: matrix.kind == 'no_std'
shell: bash
Expand All @@ -301,9 +301,11 @@ jobs:

# check with no features
cargo clippy --target ${{ matrix.target }} ${{ matrix.extra-flags }} -p wgpu-types --no-default-features
cargo clippy --target ${{ matrix.target }} ${{ matrix.extra-flags }} -p naga --no-default-features

# Check with all features except "std".
# Check with all compatible features
cargo clippy --target ${{ matrix.target }} ${{ matrix.extra-flags }} -p wgpu-types --no-default-features --features strict_asserts,fragile-send-sync-non-atomic-wasm,serde,counters
cargo clippy --target ${{ matrix.target }} ${{ matrix.extra-flags }} -p naga --no-default-features --features dot-out,compact
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This comment isn't correct for naga - I think you should pull them out into their own lines instead of attaching them.

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I've just updated the comments to be more broad. I do like the two groups (no features, all compatible features), but I'm happy to split it up (either crate by crate or just each line on it's own)


# Building for native platforms with standard tests.
- name: Check native
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4 changes: 4 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -42,6 +42,10 @@ Bottom level categories:

### New Features

#### Naga

- Added `no_std` support with default features disabled. By @Bushrat011899 in [#7585](https://github.com/gfx-rs/wgpu/pull/7585).

#### General

- Add support for rendering to slices of 3D texture views and single layered 2D-Array texture views (this requires `VK_KHR_maintenance1` which should be widely available on newer drivers). By @teoxoy in [#7596](https://github.com/gfx-rs/wgpu/pull/7596)
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1 change: 1 addition & 0 deletions Cargo.lock
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2 changes: 2 additions & 0 deletions naga/Cargo.toml
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Expand Up @@ -91,6 +91,8 @@ hashbrown.workspace = true
half = { workspace = true, features = ["num-traits"] }
rustc-hash.workspace = true
indexmap.workspace = true
# Earliest version of libm with rint and rintf
libm = { version = "0.2.6", default-features = false }
log.workspace = true
num-traits.workspace = true
once_cell = { workspace = true, features = ["alloc", "race"] }
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7 changes: 7 additions & 0 deletions naga/src/back/mod.rs
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Expand Up @@ -46,6 +46,13 @@ pub type NeedBakeExpressions = crate::FastHashSet<crate::Handle<crate::Expressio
///
/// [`Expression`]: crate::Expression
/// [`Handle`]: crate::Handle
#[cfg_attr(
not(any(glsl_out, hlsl_out, msl_out, wgsl_out)),
allow(
dead_code,
reason = "shared helpers can be dead if none of the enabled backends need it"
)
)]
struct Baked(crate::Handle<crate::Expression>);

impl core::fmt::Display for Baked {
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4 changes: 2 additions & 2 deletions naga/src/proc/constant_evaluator.rs
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Expand Up @@ -1172,8 +1172,8 @@ impl<'a> ConstantEvaluator<'a> {
}
crate::MathFunction::Round => {
component_wise_float(self, span, [arg], |e| match e {
Float::Abstract([e]) => Ok(Float::Abstract([e.round_ties_even()])),
Float::F32([e]) => Ok(Float::F32([e.round_ties_even()])),
Float::Abstract([e]) => Ok(Float::Abstract([libm::rint(e)])),
Float::F32([e]) => Ok(Float::F32([libm::rintf(e)])),
Float::F16([e]) => {
// TODO: `round_ties_even` is not available on `half::f16` yet.
//
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