Reland "[vm/ffi] Optimize Pointer operations for statically known types" Original CL in patchset 1. Fix for simdbc in patchset 4. Fix for arm32 precompiled in: https://dart-review.googlesource.com/c/sdk/+/120660/ This CL optimizes Pointer operations in hot loops for Pointer<NativeInteger/NativeDouble/Pointer> (not for structs). Design: go/dart-ffi-pointers-il It provides roughly a 100x speedup for the FfiMemory benchmark. The next 5x speedup is to get rid of allocations due to `load` and `store` not being inlined. FFI API is changed to enable optimizations: * Disable dynamic invocations of Pointer.load / Pointer.store. * Disallow implicit downcast of argument passed to Pointer.store. * Stop zeroing out Pointer.address on Pointer.free(). Issue: https://github.com/dart-lang/sdk/issues/38172 Related issues: Closes: https://github.com/dart-lang/sdk/issues/35902 (Disallowing dynamic invocations of Pointer ops.) Closes: https://github.com/dart-lang/sdk/issues/37385 (Function variance checking) Change-Id: I3921a595fd05026d6ca565ace496771d7c1d877b Cq-Include-Trybots: luci.dart.try:vm-ffi-android-debug-arm-try,vm-ffi-android-debug-arm64-try,app-kernel-linux-debug-x64-try,vm-kernel-linux-debug-ia32-try,vm-dartkb-linux-debug-simarm64-try,vm-kernel-win-debug-x64-try,vm-kernel-win-debug-ia32-try,vm-dartkb-linux-debug-x64-try,vm-kernel-precomp-linux-debug-x64-try,vm-dartkb-linux-release-x64-abi-try,vm-kernel-precomp-android-release-arm64-try,vm-kernel-asan-linux-release-x64-try,vm-kernel-linux-release-simarm-try,vm-kernel-linux-release-simarm64-try,vm-kernel-mac-debug-simdbc64-try,vm-kernel-precomp-android-release-arm_x64-try,vm-kernel-reload-mac-release-simdbc64-try,vm-kernel-precomp-obfuscate-linux-release-x64-try,vm-kernel-reload-rollback-linux-debug-x64-try,vm-kernel-precomp-mac-release-simarm_x64-try Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/120661 Reviewed-by: Martin Kustermann <kustermann@google.com> Commit-Queue: Daco Harkes <dacoharkes@google.com>
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