171079 2017-04-20 15:05:31 -0700 virtualThunkFor() needs to materialize its of tagMaskRegister for tail calls. 2017-04-20 17:31:43 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 mark.lam mark.lam fpizlo jfbastien keith_miller msaboff saam webkit-bug-importer oldest_to_newest 1299320 0 mark.lam 2017-04-20 15:05:31 -0700 This is because tail calls would restore callee saved registers (and therefore, potentially clobber the tag registers) before jumping to the thunk. <rdar://problem/31684756> 1299351 1 307654 mark.lam 2017-04-20 15:52:03 -0700 Created attachment 307654 proposed patch. 1299358 2 307654 saam 2017-04-20 16:01:02 -0700 Comment on attachment 307654 proposed patch. View in context: https://bugs.webkit.org/attachment.cgi?id=307654&action=review r=me > Source/JavaScriptCore/jit/AssemblyHelpers.h:429 > + void emitMaterializeTagMaskInRegister(GPRReg reg) > + { > + move(MacroAssembler::TrustedImm64(TagTypeNumber), reg); > + orPtr(MacroAssembler::TrustedImm32(TagBitTypeOther), reg, reg); > + } Please verify this is less code on X86_64 and ARM64, otherwise, please specialize to those platforms what you do such that we emit less code. 1299364 3 mark.lam 2017-04-20 16:07:48 -0700 (In reply to Saam Barati from comment #2) > Comment on attachment 307654 [details] > proposed patch. > > View in context: > https://bugs.webkit.org/attachment.cgi?id=307654&action=review > > r=me > > > Source/JavaScriptCore/jit/AssemblyHelpers.h:429 > > + void emitMaterializeTagMaskInRegister(GPRReg reg) > > + { > > + move(MacroAssembler::TrustedImm64(TagTypeNumber), reg); > > + orPtr(MacroAssembler::TrustedImm32(TagBitTypeOther), reg, reg); > > + } > > Please verify this is less code on X86_64 and ARM64, otherwise, please > specialize to those platforms what you do such that we emit less code. I think it's better to use a single instruction. I'll switch to doing that. 1299381 4 307658 mark.lam 2017-04-20 16:32:40 -0700 Created attachment 307658 patch for landing. 1299420 5 mark.lam 2017-04-20 17:31:43 -0700 Thanks for the review. Landed in r215596: <http://trac.webkit.org/r215596>. 307654 2017-04-20 15:52:03 -0700 2017-04-20 16:32:40 -0700 proposed patch. bug-171079.patch text/plain 4405 mark.lam SW5kZXg6IEpTVGVzdHMvQ2hhbmdlTG9nCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIEpTVGVzdHMvQ2hhbmdlTG9n CShyZXZpc2lvbiAyMTU1ODIpCisrKyBKU1Rlc3RzL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpA QCAtMSwzICsxLDEzIEBACisyMDE3LTA0LTIwICBNYXJrIExhbSAgPG1hcmsubGFtQGFwcGxlLmNv bT4KKworICAgICAgICB2aXJ0dWFsVGh1bmtGb3IoKSBuZWVkcyB0byBtYXRlcmlhbGl6ZSBpdHMg b2YgdGFnTWFza1JlZ2lzdGVyIGZvciB0YWlsIGNhbGxzLgorICAgICAgICBodHRwczovL2J1Z3Mu d2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MTcxMDc5CisgICAgICAgIDxyZGFyOi8vcHJvYmxl bS8zMTY4NDc1Nj4KKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKworICAg ICAgICAqIHN0cmVzcy9yZWdyZXNzLTE3MTA3OS5qczogQWRkZWQuCisKIDIwMTctMDQtMTUgIEZp bGlwIFBpemxvICA8ZnBpemxvQGFwcGxlLmNvbT4KIAogICAgICAgICBPcHRpbWl6ZSBTaGFyZWRB 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