tree 8d744e8a2a0b88f3b16a51dcbdadb65214d29d55
parent f8672d8c359ff23b1c22000274e55a6d937c9dc1
author Ben Clayton <bclayton@google.com> 1645626734 +0000
committer Tint LUCI CQ <tint-scoped@luci-project-accounts.iam.gserviceaccount.com> 1645626734 +0000

builtins: Add firstTrailingBit

Currently polyfilled for all backends.
HLSL should be able to map this to 'firstbitlow', 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/1003

Bug: tint:1367
Bug: tint:1449
Change-Id: I8125b32687196678906e5a9d056b4f2efd885073
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/81502
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: David Neto <dneto@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>