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Leszek Swirski authored
This reverts commit 51b99213. Reason for revert: Speculative revert for MSAN failure https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Linux%20-%20arm64%20-%20sim%20-%20MSAN/43080/overview Original change's description: > [osr] Add an install-by-offset mechanism > > .. for concurrent OSR. There, the challenge is to hit the correct > JumpLoop bytecode once compilation completes, since execution has > moved on in the meantime. > > This CL adds a new mechanism to request installation at a specific > bytecode offset. We add a new `osr_install_target` field to the > BytecodeArray: > > bitfield struct OSRUrgencyAndInstallTarget extends uint16 { > osr_urgency: uint32: 3 bit; > osr_install_target: uint32: 13 bit; > } > > // [...] > osr_urgency_and_install_target: OSRUrgencyAndInstallTarget; > bytecode_age: uint16; // Only 3 bits used. > // [...] > > Note urgency and install target are packed into one 16 bit field, > we can thus merge both checks into one comparison within JumpLoop. > Note also that these fields are adjacent to the bytecode age; we > still reset both OSR state and age with a single (now 32-bit) > store. > > The install target is the lowest 13 bits of the bytecode offset. > When set, every reached JumpLoop will check `is this my offset?`, > and if yes, jump into runtime to tier up. > > Drive-by: Rename BaselineAssembler::LoadByteField to LoadWord8Field. > > Bug: v8:12161 > Change-Id: I275d468b19df3a4816392a2fec0713a8d211ef80 > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3571812 > Reviewed-by: Leszek Swirski <leszeks@chromium.org> > Commit-Queue: Jakob Linke <jgruber@chromium.org> > Cr-Commit-Position: refs/heads/main@{#79853} Bug: v8:12161 Change-Id: I0c47499544465c80b5b23a492c00ec1c62815caa No-Presubmit: true No-Tree-Checks: true No-Try: true Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3576121 Auto-Submit: Leszek Swirski <leszeks@chromium.org> Owners-Override: Leszek Swirski <leszeks@chromium.org> Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com> Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com> Cr-Commit-Position: refs/heads/main@{#79855}
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