194252 2019-02-04 16:27:07 -0800 B3ReduceStrength: missing peephole optimizations for binary operations 2019-02-22 14:55:34 -0800 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 154319 1 rmorisset rmorisset commit-queue ews-watchlist keith_miller mark.lam msaboff saam webkit-bug-importer oldest_to_newest 1502096 0 rmorisset 2019-02-04 16:27:07 -0800 BitAnd is distributive over both BitOr and BitXor. So the following should all work: - Op(BitAnd(x1, x2), BitAnd(x1, x3)) => BitAnd(x1, Op(x2, x3)) - Op(BitAnd(x2, x1), BitAnd(x1, x3)) => BitAnd(x1, Op(x2, x3)) - Op(BitAnd(x1, x2), BitAnd(x3, x1)) => BitAnd(x1, Op(x2, x3)) - Op(BitAnd(x2, x1), BitAnd(x3, x1)) => BitAnd(x1, Op(x2, x3)) for Op in {BitOr, BitXor} Similarily, we can use De Morgan laws to float binary not (represented as BitXor(x, allOnes)) outwards, and eliminate as many as possible: - BitAnd(BitXor(x1, allOnes), BitXor(x2, allOnes)) => BitXor(BitOr(x1, x2), allOnes) - BitOr(BitXor(x1, allOnes), BitXor(x2, allOnes) => BitXor(BitAnd(x1, x2), allOnes) - BitAnd(BitXor(x, allOnes), c) => BitXor(BitOr(x, ~c)) - BitOr(BitXor(x, allOnes), c) => BitXor(BitAnd(x, ~c)) Like all other peephole optimizations, the performance benefit is probably too small to measure, but it is very low-hanging fruit. 1502579 1 361240 rmorisset 2019-02-05 16:14:27 -0800 Created attachment 361240 WIP_missing_tests 1502587 2 ews-watchlist 2019-02-05 16:23:18 -0800 Attachment 361240 did not pass style-queue: ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:999: Multi line control clauses should use braces. [whitespace/braces] [4] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1002: Weird number of spaces at line-start. Are you using a 4-space indent? [whitespace/indent] [3] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1003: Boolean expressions that span multiple lines should have their operators on the left side of the line instead of the right side. [whitespace/operators] [4] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1003: Weird number of spaces at line-start. Are you using a 4-space indent? [whitespace/indent] [3] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1005: Weird number of spaces at line-start. Are you using a 4-space indent? [whitespace/indent] [3] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1006: Weird number of spaces at line-start. Are you using a 4-space indent? [whitespace/indent] [3] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1016: Multi line control clauses should use braces. [whitespace/braces] [4] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1019: Boolean expressions that span multiple lines should have their operators on the left side of the line instead of the right side. [whitespace/operators] [4] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1019: Weird number of spaces at line-start. Are you using a 4-space indent? [whitespace/indent] [3] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1021: Weird number of spaces at line-start. Are you using a 4-space indent? [whitespace/indent] [3] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1022: Missing space after , [whitespace/comma] [3] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1076: Multi line control clauses should use braces. [whitespace/braces] [4] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1079: Weird number of spaces at line-start. Are you using a 4-space indent? [whitespace/indent] [3] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1080: Boolean expressions that span multiple lines should have their operators on the left side of the line instead of the right side. [whitespace/operators] [4] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1080: Weird number of spaces at line-start. Are you using a 4-space indent? [whitespace/indent] [3] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1082: Weird number of spaces at line-start. Are you using a 4-space indent? [whitespace/indent] [3] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1083: Weird number of spaces at line-start. Are you using a 4-space indent? [whitespace/indent] [3] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1093: Multi line control clauses should use braces. [whitespace/braces] [4] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1096: Boolean expressions that span multiple lines should have their operators on the left side of the line instead of the right side. [whitespace/operators] [4] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1096: Weird number of spaces at line-start. Are you using a 4-space indent? [whitespace/indent] [3] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1098: Weird number of spaces at line-start. Are you using a 4-space indent? [whitespace/indent] [3] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1099: Missing space after , [whitespace/comma] [3] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:2256: Place brace on its own line for function definitions. [whitespace/braces] [4] Total errors found: 23 in 3 files If any of these errors are false positives, please file a bug against check-webkit-style. 1503417 3 361312 rmorisset 2019-02-06 12:12:12 -0800 Created attachment 361312 Patch 1503422 4 ews-watchlist 2019-02-06 12:17:35 -0800 Attachment 361312 did not pass style-queue: ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1002: When wrapping a line, only indent 4 spaces. [whitespace/indent] [3] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1019: When wrapping a line, only indent 4 spaces. [whitespace/indent] [3] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1079: When wrapping a line, only indent 4 spaces. [whitespace/indent] [3] ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1096: When wrapping a line, only indent 4 spaces. [whitespace/indent] [3] Total errors found: 4 in 3 files If any of these errors are false positives, please file a bug against check-webkit-style. 1503775 5 rmorisset 2019-02-07 10:13:29 -0800 (In reply to Build Bot from comment #4) > Attachment 361312 [details] did not pass style-queue: > > > ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1002: When wrapping a > line, only indent 4 spaces. [whitespace/indent] [3] > ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1019: When wrapping a > line, only indent 4 spaces. [whitespace/indent] [3] > ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1079: When wrapping a > line, only indent 4 spaces. [whitespace/indent] [3] > ERROR: Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1096: When wrapping a > line, only indent 4 spaces. [whitespace/indent] [3] > Total errors found: 4 in 3 files > > > If any of these errors are false positives, please file a bug against > check-webkit-style. I don't see a way to solve these without making the condition unreadable. Does it bother anybody if I keep it as is? 1507197 6 361312 saam 2019-02-17 23:42:23 -0800 Comment on attachment 361312 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=361312&action=review r=me > Source/JavaScriptCore/ChangeLog:47 > + I did not list every single reordering of the arguments as the test part of this patch is already significantly longer than the useful code, and this combination should sample all the relevant paths. That’s not our criteria for adding tests. Why don’t you just make it so your test doesn’t hard code lhs/rhs to generate all combinations? > Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1002 > + && m_value->child(0)->child(1)->isInt(0xffffffffffffffff) maybe use numeric_limits here? > Source/JavaScriptCore/b3/B3ReduceStrength.cpp:2242 > + // Turn any of these: You should say for op Or/Xor 1509170 7 rmorisset 2019-02-22 14:15:41 -0800 Thanks for the review. > > Source/JavaScriptCore/ChangeLog:47 > > + I did not list every single reordering of the arguments as the test part of this patch is already significantly longer than the useful code, and this combination should sample all the relevant paths. > > That’s not our criteria for adding tests. Why don’t you just make it so your > test doesn’t hard code lhs/rhs to generate all combinations? Done. > > Source/JavaScriptCore/b3/B3ReduceStrength.cpp:1002 > > + && m_value->child(0)->child(1)->isInt(0xffffffffffffffff) > > maybe use numeric_limits here? Done. > > Source/JavaScriptCore/b3/B3ReduceStrength.cpp:2242 > > + // Turn any of these: > > You should say for op Or/Xor Fixed. 1509171 8 362764 rmorisset 2019-02-22 14:16:23 -0800 Created attachment 362764 Patch 1509180 9 362764 commit-queue 2019-02-22 14:54:28 -0800 Comment on attachment 362764 Patch Clearing flags on attachment: 362764 Committed r241964: <https://trac.webkit.org/changeset/241964> 1509181 10 commit-queue 2019-02-22 14:54:30 -0800 All reviewed patches have been landed. Closing bug. 1509182 11 webkit-bug-importer 2019-02-22 14:55:34 -0800 <rdar://problem/48325164> 361240 2019-02-05 16:14:27 -0800 2019-02-06 12:12:11 -0800 WIP_missing_tests bug-194252-20190205161426.patch text/plain 11581 rmorisset SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMjQwOTk5KQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDEzIEBA CisyMDE5LTAyLTA1ICBSb2JpbiBNb3Jpc3NldCAgPHJtb3Jpc3NldEBhcHBsZS5jb20+CisKKyAg ICAgICAgQjNSZWR1Y2VTdHJlbmd0aDogbWlzc2luZyBwZWVwaG9sZSBvcHRpbWl6YXRpb25zIGZv ciBiaW5hcnkgb3BlcmF0aW9ucworICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93 X2J1Zy5jZ2k/aWQ9MTk0MjUyCisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISku CisKKyAgICAgICAgKiBiMy9CM1JlZHVjZVN0cmVuZ3RoLmNwcDoKKyAgICAgICAgKiBiMy90ZXN0 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