21985 2008-10-30 13:15:43 -0700 Opcodes should use eax as their destination register whenever possible 2008-10-30 14:27:50 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) All All RESOLVED FIXED P2 Normal --- 1 zwarich zwarich oldest_to_newest 97156 0 zwarich 2008-10-30 13:15:43 -0700 Some opcodes pointlessly use something other than eax as their destination register or supply eax as an argument to emitPutResult rather than using the default. This potentially makes the sort of memory traffic elimination like in bug 21943 less of a win. 97159 1 24778 zwarich 2008-10-30 13:46:21 -0700 Created attachment 24778 Proposed patch 97161 2 24779 zwarich 2008-10-30 13:50:23 -0700 Created attachment 24779 Revised proposed patch I forgot to remove one of the explicit uses of eax. Here is a new patch. 97163 3 24779 sam 2008-10-30 13:53:47 -0700 Comment on attachment 24779 Revised proposed patch r=me 97164 4 24778 mjs 2008-10-30 13:56:40 -0700 Comment on attachment 24778 Proposed patch r=me > Index: ChangeLog > =================================================================== > --- ChangeLog (revision 38005) > +++ ChangeLog (working copy) > @@ -1,3 +1,17 @@ > +2008-10-30 Cameron Zwarich <zwarich@apple.com> > + > + Reviewed by NOBODY (OOPS!). > + > + Bug 21985: Opcodes should use eax as their destination register whenever possible > + <https://bugs.webkit.org/show_bug.cgi?id=21985> > + > + Change more opcodes to use eax as the register for their final result, > + and change calls to emitPutResult() that pass eax to rely on the default > + value of eax. > + > + * VM/CTI.cpp: > + (JSC::CTI::privateCompileMainPass): > + > 2008-10-30 Alp Toker <alp@nuanti.com> > > Build fix attempt for older gcc on the trunk-mac-intel build bot > Index: VM/CTI.cpp > =================================================================== > --- VM/CTI.cpp (revision 38001) > +++ VM/CTI.cpp (working copy) > @@ -1011,10 +1011,10 @@ void CTI::privateCompileMainPass() > case op_mov: { > unsigned src = instruction[i + 2].u.operand; > if (isConstant(src)) > - m_jit.movl_i32r(asInteger(getConstant(m_callFrame, src)), X86::edx); > + m_jit.movl_i32r(asInteger(getConstant(m_callFrame, src)), X86::eax); > else > - emitGetArg(src, X86::edx); > - emitPutResult(instruction[i + 1].u.operand, X86::edx); > + emitGetArg(src, X86::eax); > + emitPutResult(instruction[i + 1].u.operand); > i += 3; > break; > } > @@ -1071,7 +1071,7 @@ void CTI::privateCompileMainPass() > emitJumpSlowCaseIfNotImmNum(X86::eax, i); > m_jit.addl_i8r(getDeTaggedConstantImmediate(JSImmediate::oneImmediate()), X86::eax); > m_slowCases.append(SlowCaseEntry(m_jit.emitUnlinkedJo(), i)); > - emitPutResult(srcDst, X86::eax); > + emitPutResult(srcDst); > i += 2; > break; > } > @@ -1305,7 +1305,7 @@ void CTI::privateCompileMainPass() > JSVariableObject* globalObject = static_cast<JSVariableObject*>(instruction[i + 2].u.jsCell); > m_jit.movl_i32r(asInteger(globalObject), X86::eax); > emitGetVariableObjectRegister(X86::eax, instruction[i + 3].u.operand, X86::eax); > - emitPutResult(instruction[i + 1].u.operand, X86::eax); > + emitPutResult(instruction[i + 1].u.operand); > i += 4; > break; > } > @@ -1407,8 +1407,8 @@ void CTI::privateCompileMainPass() > X86Assembler::JmpSrc isObject = m_jit.emitUnlinkedJe(); > > m_jit.link(isImmediate, m_jit.label()); > - emitGetArg(instruction[i + 2].u.operand, X86::ecx); > - emitPutResult(instruction[i + 1].u.operand, X86::ecx); > + emitGetArg(instruction[i + 2].u.operand, X86::eax); > + emitPutResult(instruction[i + 1].u.operand, X86::eax); > m_jit.link(isObject, m_jit.label()); > > i += 3; > @@ -1603,7 +1603,7 @@ void CTI::privateCompileMainPass() > emitJumpSlowCaseIfNotImmNum(X86::eax, i); > m_jit.subl_i8r(getDeTaggedConstantImmediate(JSImmediate::oneImmediate()), X86::eax); > m_slowCases.append(SlowCaseEntry(m_jit.emitUnlinkedJo(), i)); > - emitPutResult(srcDst, X86::eax); > + emitPutResult(srcDst); > i += 2; > break; > } 97173 5 zwarich 2008-10-30 14:27:50 -0700 Landed in r38009. Don't review my old patches, Maciej. ;-) 24778 2008-10-30 13:46:21 -0700 2008-10-30 14:27:29 -0700 Proposed patch eax.diff text/plain 3415 zwarich SW5kZXg6IENoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBDaGFuZ2VMb2cJKHJldmlzaW9uIDM4MDA1 KQorKysgQ2hhbmdlTG9nCSh3b3JraW5nIGNvcHkpCkBAIC0xLDMgKzEsMTcgQEAKKzIwMDgtMTAt MzAgIENhbWVyb24gWndhcmljaCAgPHp3YXJpY2hAYXBwbGUuY29tPgorCisgICAgICAgIFJldmll d2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgIEJ1ZyAyMTk4NTogT3Bjb2RlcyBzaG91 bGQgdXNlIGVheCBhcyB0aGVpciBkZXN0aW5hdGlvbiByZWdpc3RlciB3aGVuZXZlciBwb3NzaWJs ZQorICAgICAgICA8aHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTIxOTg1 PgorCisgICAgICAgIENoYW5nZSBtb3JlIG9wY29kZXMgdG8gdXNlIGVheCBhcyB0aGUgcmVnaXN0 ZXIgZm9yIHRoZWlyIGZpbmFsIHJlc3VsdCwKKyAgICAgICAgYW5kIGNoYW5nZSBjYWxscyB0byBl bWl0UHV0UmVzdWx0KCkgdGhhdCBwYXNzIGVheCB0byByZWx5IG9uIHRoZSBkZWZhdWx0CisgICAg ICAgIHZhbHVlIG9mIGVheC4KKworICAgICAgICAqIFZNL0NUSS5jcHA6CisgICAgICAgIChKU0M6 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