[Webkit-unassigned] [Bug 232647] New: Remove ReduceLoopStrength

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Nov 2 17:04:10 PDT 2021


            Bug ID: 232647
           Summary: Remove ReduceLoopStrength
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: justin_michaud at apple.com

After the introduction of WasmAddress, this pass no longer does anything. It will likely only ever be profitable for WASM, and in addition, the pattern matching is pretty fragile. For now, we should remove it, and consider re-adding it when we need a JetStream progression. Here are some additional thoughts that we should consider before we add it back:

1) We consider hoisting WasmAddress in LICM or as a peephole optimization
2) We should support ARM64: see 230908
3) If we get SIMD/memcpy instruction support, we should consider inlining memcpy
4) We should make the pattern matching more general

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