188716 2018-08-17 19:04:26 -0700 [WTF] Add WTF::unalignedLoad and WTF::unalignedStore 2018-08-20 20:38:26 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 ysuzuki ysuzuki darin fujii mark.lam saam sam webkit-bug-importer oldest_to_newest 1451323 0 ysuzuki 2018-08-17 19:04:26 -0700 [WTF] Add WTF::unalignedLoad and WTF::unalignedStore 1451325 1 347421 ysuzuki 2018-08-17 19:10:40 -0700 Created attachment 347421 Patch 1451329 2 347423 ysuzuki 2018-08-17 19:18:59 -0700 Created attachment 347423 Patch 1451443 3 347455 ysuzuki 2018-08-19 01:21:51 -0700 Created attachment 347455 Patch 1451462 4 347455 darin 2018-08-19 12:24:36 -0700 Comment on attachment 347455 Patch How close does this put us to removing reinterpret_cast_ptr? 1451483 5 ysuzuki 2018-08-19 15:42:00 -0700 (In reply to Darin Adler from comment #4) > Comment on attachment 347455 [details] > Patch > > How close does this put us to removing reinterpret_cast_ptr? Nice catch. Currently, `reinterpret_cast_ptr<T>(ptr)` is used only when we ensure that the casted `ptr` has the expected alignment by `T`. It would be optimized way with CPUs without unaligned accesses support. But since the major CPUs like ARM64, X86, and X86_64 support unaligned accesses, always using `WTF::unalignedXXX` would be feasible. We should investigate each site of `reinterpret_cast_ptr` carefully to decide whether we can replace it with unalignedXXX helpers! 1451484 6 ysuzuki 2018-08-19 15:50:11 -0700 Committed r235018: <https://trac.webkit.org/changeset/235018> 1451592 7 fujii 2018-08-20 06:58:37 -0700 I'm surprised. There are so many unaligned access. I thought unaligned memory access is slow. See https://github.com/spotify/linux/blob/master/Documentation/unaligned-memory-access.txt Are they really unaligned memory access? Or, actually aligned? 1451825 8 webkit-bug-importer 2018-08-20 16:52:06 -0700 <rdar://problem/43534448> 1451948 9 ysuzuki 2018-08-20 20:38:26 -0700 (In reply to Fujii Hironori from comment #7) > I'm surprised. There are so many unaligned access. > I thought unaligned memory access is slow. > See > https://github.com/spotify/linux/blob/master/Documentation/unaligned-memory- > access.txt > > Are they really unaligned memory access? Or, actually aligned? Unaligned accesses reported by UBSan. They are typically filling/extracting an value into/from X86 machine code stream. 347421 2018-08-17 19:10:40 -0700 2018-08-17 19:18:56 -0700 Patch bug-188716-20180818111039.patch text/plain 10640 ysuzuki U3VidmVyc2lvbiBSZXZpc2lvbjogMjM1MDA0CmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCA0 OGE2YWFlNDk4YTg5NWQ4OTZhYTU1MDNlZDJhMGRhOWFhMDkzMDIyLi5kNzk3NDdjYjYxZGU4Njlh ZGEzZTY4YWQ1OTQwNzc2MzVjMDU3MDIyIDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs MyArMSwzMiBAQAorMjAxOC0wOC0xNyAgWXVzdWtlIFN1enVraSAgPHl1c3VrZXN1enVraUBzbG93 c3RhcnQub3JnPgorCisgICAgICAgIFtXVEZdIEFkZCBXVEY6OnVuYWxpZ25lZExvYWQgYW5kIFdU Rjo6dW5hbGlnbmVkU3RvcmUKKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19i dWcuY2dpP2lkPTE4ODcxNgorCisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEpLgor CisgICAgICAgIFdoaWxlIHNvbWUgQ1BVcyBhbGxvdyB1bmFsaWduZWQgYWNjZXNzZXMgdG8gbWVt 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