[naga] Use checked_mul or leading_zeros to detect shl overflows #6186
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Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>
teoxoy
approved these changes
Aug 31, 2024
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fixes #6175
Description
On u32 we can use
a.checked_mul(1.checked_shl(b)?)?to detect overflows, but unfortunetly same trick does not work for signed numbers, where we simply follow spec per letter.Testing
Tested via CTS run in servo, makes all subtests of
_webgpu/webgpu/cts.https.html?q=webgpu:shader,validation,expression,binary,bitwise_shift:shift_left_concrete:*pass in servoChecklist
cargo fmt.cargo clippy. If applicable, add:--target wasm32-unknown-unknown--target wasm32-unknown-emscriptencargo xtask testto run tests.CHANGELOG.md. See simple instructions inside file.