227171 2021-06-18 10:50:46 -0700 Add a new pattern to instruction selector to use EXTR supported by ARM64 2021-07-01 10:25:35 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 yijia_huang yijia_huang ews-watchlist fpizlo keith_miller mark.lam msaboff rmorisset saam tzagallo webkit-bug-importer oldest_to_newest 1771039 0 yijia_huang 2021-06-18 10:50:46 -0700 ... 1771768 1 yijia_huang 2021-06-22 13:10:01 -0700 This bug will be fixed in the ubfiz patch(bug 227204). 1772729 2 yijia_huang 2021-06-25 11:02:00 -0700 This is fixed in bug 227204. 1772741 3 yijia_huang 2021-06-25 12:28:41 -0700 Use this bug report for other purpose: Add ARM64 BFC into AIR opcode 1772959 4 yijia_huang 2021-06-27 14:22:33 -0700 ARM64 BFC instruction is already added in bug 227202. Use this bug report for another purpose: Add ARM64 BFXIL 1773663 5 432567 yijia_huang 2021-06-29 23:14:06 -0700 Created attachment 432567 Patch 1773664 6 webkit-bug-importer 2021-06-29 23:14:17 -0700 <rdar://problem/79951628> 1773764 7 432600 yijia_huang 2021-06-30 08:56:09 -0700 Created attachment 432600 Patch 1773803 8 432600 fpizlo 2021-06-30 10:14:51 -0700 Comment on attachment 432600 Patch Nice! 1773805 9 yijia_huang 2021-06-30 10:19:11 -0700 (In reply to Filip Pizlo from comment #8) > Comment on attachment 432600 [details] > Patch > > Nice! Thanks for the review. 1773806 10 432600 rmorisset 2021-06-30 10:19:23 -0700 Comment on attachment 432600 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=432600&action=review I like it overall, but I am concerned that you may have broken the instruction selection for sbfiz. > Source/JavaScriptCore/ChangeLog:13 > + ### Part A zero extend bitfield ### I like that, as BitAnd(value, mask) is a lot more canonical throughout the compiler. But I just checked, and your pattern for sbfiz looks for the ZShr(Shl(value, amount), amount) pattern. Have you tried running testInsertSignedBitfieldInZero64 on ARM64 ? I would expect it to fail until you replace the pattern for sbfiz in B3LowerToAir. > Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1482 > + uint64_t mask = width == datasize ? -1ULL : (1ULL << width) - 1ULL; nitpick: instead of `-1ULL` on the true side, I would put std::numeric_limits<uint64_t>::max(). It is almost certainly equivalent, but marking a negative number with U(unsigned)LL seems weird to me. 1773807 11 432600 saam 2021-06-30 10:20:48 -0700 Comment on attachment 432600 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=432600&action=review > Source/JavaScriptCore/ChangeLog:50 > + Int @7 = ZShr(@1, @5)) @5 -> @6 > Source/JavaScriptCore/ChangeLog:51 > + Int @8 = BitOr(@7, @6) @6 -> @5 > Source/JavaScriptCore/b3/B3LowerToAir.cpp:2860 > + commitInternal(left->child(0)); > + commitInternal(left); > + commitInternal(right); Why is this valid to do? We never check canBeInternal. Since we're using "is locked" checks, isn't that enough to just grab the temp, but not commit internal? > Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1482 > + uint64_t mask = width == datasize ? -1ULL : (1ULL << width) - 1ULL; can we use numeric_limits<uint64_t>::max instead of "-1ULL" also, if "width == datasize", can't we just replace ourselves with "value"? 1773813 12 yijia_huang 2021-06-30 10:51:09 -0700 (In reply to Robin Morisset from comment #10) > Comment on attachment 432600 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=432600&action=review > > I like it overall, but I am concerned that you may have broken the > instruction selection for sbfiz. > > > Source/JavaScriptCore/ChangeLog:13 > > + ### Part A zero extend bitfield ### > > I like that, as BitAnd(value, mask) is a lot more canonical throughout the > compiler. > But I just checked, and your pattern for sbfiz looks for the ZShr(Shl(value, > amount), amount) pattern. > Have you tried running testInsertSignedBitfieldInZero64 on ARM64 ? I would > expect it to fail until you replace the pattern for sbfiz in B3LowerToAir. Thanks for the review. That's a good question. The pattern of sbfiz is: ((src << amount) >> amount) << lsb where the right shift is signed. And the reduction rule introduced in this patch is an unsigned right shift. Turn this: ZShr(Shl(value, amount)), amount) Into this: BitAnd(value, mask) > > Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1482 > > + uint64_t mask = width == datasize ? -1ULL : (1ULL << width) - 1ULL; > > nitpick: instead of `-1ULL` on the true side, I would put > std::numeric_limits<uint64_t>::max(). It is almost certainly equivalent, but > marking a negative number with U(unsigned)LL seems weird to me. I'll update all of them. Great point! 1773815 13 yijia_huang 2021-06-30 10:59:27 -0700 (In reply to Saam Barati from comment #11) > Comment on attachment 432600 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=432600&action=review > > > Source/JavaScriptCore/ChangeLog:50 > > + Int @7 = ZShr(@1, @5)) > > @5 -> @6 > > > Source/JavaScriptCore/ChangeLog:51 > > + Int @8 = BitOr(@7, @6) > > @6 -> @5 > > > Source/JavaScriptCore/b3/B3LowerToAir.cpp:2860 > > + commitInternal(left->child(0)); > > + commitInternal(left); > > + commitInternal(right); > > Why is this valid to do? We never check canBeInternal. Since we're using "is > locked" checks, isn't that enough to just grab the temp, but not commit > internal? > > > Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1482 > > + uint64_t mask = width == datasize ? -1ULL : (1ULL << width) - 1ULL; > > can we use numeric_limits<uint64_t>::max instead of "-1ULL" > > also, if "width == datasize", can't we just replace ourselves with "value"? Thanks for the review. Working on them. 1773827 14 432613 yijia_huang 2021-06-30 11:26:58 -0700 Created attachment 432613 Patch 1773867 15 432613 rmorisset 2021-06-30 13:13:57 -0700 Comment on attachment 432613 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=432613&action=review r=me with a minor comment. Thank you for the explanation about sbfiz, I had missed that it uses SShr instead of ZShr. I'll cq+ once all the bots are green (unless you can/want to do it yourself). > Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1491 > + replaceWithIdentity(m_value->child(0)->child(0)); I don't think this is needed: in the case where amount1 == 0,the shifts will already be replaced by Identity in handleShiftAmount(). 1773869 16 432621 yijia_huang 2021-06-30 13:22:16 -0700 Created attachment 432621 Patch 1773870 17 yijia_huang 2021-06-30 13:23:12 -0700 (In reply to Robin Morisset from comment #15) > Comment on attachment 432613 [details] > Patch > > > Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1491 > > + replaceWithIdentity(m_value->child(0)->child(0)); > > I don't think this is needed: in the case where amount1 == 0,the shifts will > already be replaced by Identity in handleShiftAmount(). Indeed, thanks for pointing it out. Updated. 1774149 18 432621 rmorisset 2021-07-01 10:09:18 -0700 Comment on attachment 432621 Patch r=me; cq=me 1774155 19 ews-feeder 2021-07-01 10:25:33 -0700 Committed r279470 (239324@main): <https://commits.webkit.org/239324@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 432621. 432567 2021-06-29 23:14:06 -0700 2021-06-30 08:56:06 -0700 Patch bug-227171-20210630011405.patch text/plain 21086 yijia_huang U3VidmVyc2lvbiBSZXZpc2lvbjogMjc5MzgxCmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCAx MDg4NmU5NDM1ZjA5ZDc3M2YxNjVlYzJiZDY5NDA3MWZjNDExZmQyLi5jYjM1OTk2ZDNkYTc5NjVk OTEzNDg5MzQxOTEzODUxNDk3MmNjOTkxIDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs MyArMSwyNyBAQAorMjAyMS0wNi0yOSAgWWlqaWEgSHVhbmcgIDx5aWppYV9odWFuZ0BhcHBsZS5j b20+CisKKyAgICAgICAgQWRkIGEgbmV3IHBhdHRlcm4gdG8gaW5zdHJ1Y3Rpb24gc2VsZWN0b3Ig dG8gdXNlIEVYVFIgc3VwcG9ydGVkIGJ5IEFSTTY0CisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJr aXQub3JnL3Nob3dfYnVnLmNnaT9pZD0yMjcxNzEKKworICAgICAgICBSZXZpZXdlZCBieSBOT0JP RFkgKE9PUFMhKS4KKworICAgICAgICAqIGFzc2VtYmxlci9NYWNyb0Fzc2VtYmxlckFSTTY0Lmg6 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