tree 6abe2b4ee35c8c71ca427a6fa9bed1878941223e
parent 2680d1f846fb23b0beec5f8a778fca6d0f4fc3d5
author Ben Clayton <bclayton@google.com> 1645640430 +0000
committer Tint LUCI CQ <tint-scoped@luci-project-accounts.iam.gserviceaccount.com> 1645640430 +0000

builtins: Add firstLeadingBit

Currently polyfilled for all backends.
HLSL should be able to map this to 'firstbithigh', but there might need
to be some special case handling for 0 (undocumented behavior). For now
just polyfill.

CTS tests: https://github.com/gpuweb/cts/pull/1004

Bug: tint:1367
Bug: tint:1449
Change-Id: I9c9a08ea93d1c4a602e0ab763e95e2eea336fb0d
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/81503
Reviewed-by: David Neto <dneto@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>