RESOLVED FIXED 150656
B3::reduceStrength() should do DCE 
https://bugs.webkit.org/show_bug.cgi?id=150656
Summary B3::reduceStrength() should do DCE
Filip Pizlo
Reported 2015-10-28 18:45:54 PDT
Here's what my rough DCE can do: B3 after initial, before reduceStrength: BB#0: ; frequency = nan Int64 @0 = ArgumentReg(%rdi) Int64 @1 = Const64(0) Int64 @2 = Add(@0, @1) Int32 @3 = Load(@2, ControlDependent|Reads:Top) Int64 @4 = Const64(4) Int64 @5 = Add(@0, @4) Int32 @6 = Load(@5, ControlDependent|Reads:Top) Int32 @7 = Add(@3, @6) Void @8 = Return(@7, Terminal) B3 after reduceStrength, before lowerToAir: BB#0: ; frequency = nan Int64 @0 = ArgumentReg(%rdi) Int32 @3 = Load(@0, ControlDependent|Reads:Top) Int32 @6 = Load(@0, offset = 4, ControlDependent|Reads:Top) Int32 @7 = Add(@3, @6) Void @8 = Return(@7, Terminal)
Attachments
the patch (7.20 KB, patch)
2015-10-28 18:49 PDT, Filip Pizlo 		saam: review+
DetailsFormatted DiffDiff
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Filip Pizlo
Comment 1 2015-10-28 18:49:07 PDT
Created attachment 264284 [details] the patch
WebKit Commit Bot
Comment 2 2015-10-28 18:51:05 PDT
Attachment 264284 [details] did not pass style-queue: ERROR: Source/JavaScriptCore/b3/B3ProcedureInlines.h:39: More than one command on the same line [whitespace/newline] [4] Total errors found: 1 in 7 files If any of these errors are false positives, please file a bug against check-webkit-style.
Filip Pizlo
Comment 3 2015-10-28 18:53:14 PDT
(In reply to comment #2) > Attachment 264284 [details] did not pass style-queue: > > > ERROR: Source/JavaScriptCore/b3/B3ProcedureInlines.h:39: More than one > command on the same line [whitespace/newline] [4] > Total errors found: 1 in 7 files > > > If any of these errors are false positives, please file a bug against > check-webkit-style. Fixed.
Saam Barati
Comment 4 2015-10-28 18:56:54 PDT
Comment on attachment 264284 [details] the patch LGTM
Filip Pizlo
Comment 5 2015-10-28 18:58:26 PDT
Landed in http://trac.webkit.org/changeset/191718
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