232168 2021-10-22 13:10:39 -0700 [JSC] GetTypedArrayLengthAsInt52 must be inserted only when we ensure that input is TypedArray via array-mode-based filtering 2021-10-22 14:56:10 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 ysuzuki ysuzuki ews-watchlist keith_miller mark.lam msaboff rmorisset saam tzagallo webkit-bug-importer oldest_to_newest 1807839 0 ysuzuki 2021-10-22 13:10:39 -0700 [JSC] GetTypedArrayLengthAsInt52 must be inserted only when we ensure that input is TypedArray via array-mode-based filtering 1807840 1 442188 ysuzuki 2021-10-22 13:12:26 -0700 Created attachment 442188 Patch 1807841 2 ysuzuki 2021-10-22 13:12:29 -0700 <rdar://problem/84366658> 1807849 3 442192 ysuzuki 2021-10-22 13:25:29 -0700 Created attachment 442192 Patch 1807853 4 442192 rmorisset 2021-10-22 13:33:11 -0700 Comment on attachment 442192 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=442192&action=review > Source/JavaScriptCore/dfg/DFGSSALoweringPhase.cpp:102 > + if (m_node->arrayMode().isSomeTypedArrayView() && m_node->arrayMode().isOutOfBounds()) { This actually increases how often we take that code path, as isSomeTypedArrayView() returns true for AnyTypedArray whose typedArrayTyped() is NotTypedArray. Is it on purpose? > Source/JavaScriptCore/dfg/DFGSSALoweringPhase.cpp:152 > + if ((op == GetArrayLength) && m_node->arrayMode().isSomeTypedArrayView() && (m_node->arrayMode().mayBeLargeTypedArray() || m_graph.hasExitSite(m_node->origin.semantic, Overflow))) { Ah, this is the bug, thanks for finding it. 1807856 5 442192 ysuzuki 2021-10-22 13:38:00 -0700 Comment on attachment 442192 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=442192&action=review >> Source/JavaScriptCore/dfg/DFGSSALoweringPhase.cpp:102 >> + if (m_node->arrayMode().isSomeTypedArrayView() && m_node->arrayMode().isOutOfBounds()) { > > This actually increases how often we take that code path, as isSomeTypedArrayView() returns true for AnyTypedArray whose typedArrayTyped() is NotTypedArray. > Is it on purpose? Yes. Currently both will not get AnyArrayType value since it will be used only for some intrinsics, and they are not emitting GetByVal, PutByVal etc. But I aligned the implementation to using isSomeTypedArrayView since permitsBoundsCheckLowering (this is in the prologue of lowerBoundsCheck) is accepting AnyArrayType, and getting typed array length should work for AnyArrayType type too. >> Source/JavaScriptCore/dfg/DFGSSALoweringPhase.cpp:152 >> + if ((op == GetArrayLength) && m_node->arrayMode().isSomeTypedArrayView() && (m_node->arrayMode().mayBeLargeTypedArray() || m_graph.hasExitSite(m_node->origin.semantic, Overflow))) { > > Ah, this is the bug, thanks for finding it. Ditto. 1807857 6 442192 rmorisset 2021-10-22 13:39:11 -0700 Comment on attachment 442192 Patch r=me 1807891 7 ysuzuki 2021-10-22 14:56:10 -0700 Committed r284716 (243431@main): <https://commits.webkit.org/243431@main> 442188 2021-10-22 13:12:26 -0700 2021-10-22 13:25:28 -0700 Patch bug-232168-20211022131226.patch text/plain 3545 ysuzuki U3VidmVyc2lvbiBSZXZpc2lvbjogMjg0NjUxCmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCA1 NzkwMjc1N2Q1MGExNzU3YTFjODcyNjRlMjE0ZjAzNmY4N2I5MjdkLi5hYzIzZTI5MjE1NTcwMWU3 NTYwM2ZhMmNmYjI2OWE1YWViM2QxMTE0IDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs MyArMSwxOCBAQAorMjAyMS0xMC0yMiAgWXVzdWtlIFN1enVraSAgPHlzdXp1a2lAYXBwbGUuY29t PgorCisgICAgICAgIFtKU0NdIEdldFR5cGVkQXJyYXlMZW5ndGhBc0ludDUyIG11c3QgYmUgaW5z ZXJ0ZWQgb25seSB3aGVuIHdlIGVuc3VyZSB0aGF0IGlucHV0IGlzIFR5cGVkQXJyYXkgdmlhIGFy 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