[Webkit-unassigned] [Bug 200461] New: [WHLSL] We should generate identical metal code for the same WHLSL program

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=200461

            Bug ID: 200461
           Summary: [WHLSL] We should generate identical metal code for
                    the same WHLSL program
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGPU
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sbarati at apple.com
                CC: dino at apple.com, fpizlo at apple.com, jonlee at apple.com,
                    justin_fan at apple.com, mmaxfield at apple.com,
                    rmorisset at apple.com, sam at webkit.org

Metal process caches shaders (with what appears to be text equality). Therefore, we should always generate the same Metal program for the same WHLSL shader.

Currently, we don't do this for a few reasons, often because we rely on pointer hash tables and their iteration order. E.g, I know of at least:
- We emit struct fields in different order
- I think we do the same for enum
- I think we might do the same for functions

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