227203 2021-06-20 21:53:28 -0700 Add ARM64 SBFX and SBFIZ to instruction selector 2021-06-29 11:41:38 -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 saam sam tzagallo webkit-bug-importer oldest_to_newest 1771216 0 yijia_huang 2021-06-20 21:53:28 -0700 ... 1773328 1 432454 yijia_huang 2021-06-28 23:02:10 -0700 Created attachment 432454 Patch 1773329 2 webkit-bug-importer 2021-06-28 23:02:21 -0700 <rdar://problem/79899430> 1773420 3 432485 yijia_huang 2021-06-29 09:24:54 -0700 Created attachment 432485 Patch 1773437 4 432485 sam 2021-06-29 10:10:54 -0700 Comment on attachment 432485 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=432485&action=review > Source/JavaScriptCore/ChangeLog:11 > + 1. Itroduce a strength reduction rule for sign extending bitfield. > + 2. Add Signed Bitfield Extract (SBFX) and Signed Bitfield Insert > + in Zero (SBFIZ) to Air opcode to serve intruciton selector. Two small typos here: Itroduce -> Introduce intruciton -> instruction > Source/JavaScriptCore/ChangeLog:16 > + According to Bit Twiddling Hacks, there are two ways to sign extends bitfield. Typo: sign extends bitfield -> sign extend bitfields 1773440 5 432485 fpizlo 2021-06-29 10:20:19 -0700 Comment on attachment 432485 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=432485&action=review > Source/JavaScriptCore/ChangeLog:35 > + Turn this: ((bf & mask1) ^ mask2) - mask2 > + Into this: (bf << amount) >> amount Wow, this is super cool. You should at some point also add a reduction for bitfield zero-extend I mean, bitfield zero-extend is a funny way of saying "x & mask" where mask is !(mask & (mask + 1)). You can also say it by doing "(x << amount) >> amount", but that's not the canonical form. Totally separate from this patch though. > Source/JavaScriptCore/b3/B3LowerToAir.cpp:3036 > + if (left->opcode() != SShr || !canBeInternal(left)) A lot of the canBeInternal calls don't pass my sniff test. It's not important for you to change this in this patch, but we should reconsider all of these eventually. Let's just take this one as an example. Say you have a program that does the following (capital letters are constants): a = x << C b = a >> C c = b << D print(a) print(b) print(c) Clearly, the pattern won't match because of !canBeInternal for a and b. So, this would emit three separate instructions. But what if we removed canBeInternal? It would still be just three separate instructions, and they wouldn't be any more expensive. Now imagine if we remove the print(b), above. Then, with the canBeInternal check, we're emitting three instructions. Without the canBeInternal check, we'd emit only two (x << C and SBFIZ to compute c). And that would be less expensive. Basically, to decide if canBeInternal is profitable or not, you want to imagine a program where every internal value is actually used elsewhere, and then ask yourself: would the code I generate with my pattern be worse than without my pattern for that code if I never checked canBeInternal? If the answer is that the pattern doesn't cause worst code generation in the all-internals-are-captured case, then you don't want canBeInternal checks. 1773441 6 yijia_huang 2021-06-29 10:22:31 -0700 (In reply to Sam Weinig from comment #4) > Comment on attachment 432485 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=432485&action=review > > > Source/JavaScriptCore/ChangeLog:11 > > + 1. Itroduce a strength reduction rule for sign extending bitfield. > > + 2. Add Signed Bitfield Extract (SBFX) and Signed Bitfield Insert > > + in Zero (SBFIZ) to Air opcode to serve intruciton selector. > > Two small typos here: > > Itroduce -> Introduce > intruciton -> instruction > > > Source/JavaScriptCore/ChangeLog:16 > > + According to Bit Twiddling Hacks, there are two ways to sign extends bitfield. > > Typo: > > sign extends bitfield -> sign extend bitfields Thanks for the review. 1773442 7 yijia_huang 2021-06-29 10:22:51 -0700 (In reply to Filip Pizlo from comment #5) > Comment on attachment 432485 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=432485&action=review > > > Source/JavaScriptCore/ChangeLog:35 > > + Turn this: ((bf & mask1) ^ mask2) - mask2 > > + Into this: (bf << amount) >> amount > > Wow, this is super cool. > > You should at some point also add a reduction for bitfield zero-extend I > mean, bitfield zero-extend is a funny way of saying "x & mask" where mask is > !(mask & (mask + 1)). You can also say it by doing "(x << amount) >> > amount", but that's not the canonical form. Totally separate from this > patch though. > > > Source/JavaScriptCore/b3/B3LowerToAir.cpp:3036 > > + if (left->opcode() != SShr || !canBeInternal(left)) > > A lot of the canBeInternal calls don't pass my sniff test. It's not > important for you to change this in this patch, but we should reconsider all > of these eventually. > > Let's just take this one as an example. > > Say you have a program that does the following (capital letters are > constants): > > a = x << C > b = a >> C > c = b << D > > print(a) > print(b) > print(c) > > Clearly, the pattern won't match because of !canBeInternal for a and b. So, > this would emit three separate instructions. But what if we removed > canBeInternal? It would still be just three separate instructions, and they > wouldn't be any more expensive. Now imagine if we remove the print(b), > above. Then, with the canBeInternal check, we're emitting three > instructions. Without the canBeInternal check, we'd emit only two (x << C > and SBFIZ to compute c). And that would be less expensive. > > Basically, to decide if canBeInternal is profitable or not, you want to > imagine a program where every internal value is actually used elsewhere, and > then ask yourself: would the code I generate with my pattern be worse than > without my pattern for that code if I never checked canBeInternal? If the > answer is that the pattern doesn't cause worst code generation in the > all-internals-are-captured case, then you don't want canBeInternal checks. Thanks for the review. 1773456 8 432500 yijia_huang 2021-06-29 10:48:46 -0700 Created attachment 432500 Patch 1773475 9 ews-feeder 2021-06-29 11:41:36 -0700 Committed r279378 (239243@main): <https://commits.webkit.org/239243@main> All reviewed patches have been landed. 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