128890 2014-02-16 18:09:04 -0800 FTL OSR exit shouldn't make X86-specific assumptions 2014-02-17 10:54:16 -0800 1 1 1 Unclassified WebKit New Bugs 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 112840 1 fpizlo fpizlo barraclough ggaren mark.lam mhahnenberg mmirman msaboff nrotem oliver sam oldest_to_newest 981310 0 fpizlo 2014-02-16 18:09:04 -0800 FTL OSR exit shouldn't make X86-specific assumptions 981311 1 224326 fpizlo 2014-02-16 18:10:27 -0800 Created attachment 224326 Patch 981497 2 224326 msaboff 2014-02-17 09:18:11 -0800 Comment on attachment 224326 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=224326&action=review > Source/JavaScriptCore/assembler/MacroAssemblerARM64.h:1469 > + RegisterID reg = getCachedDataTempRegisterIDAndInvalidate(); > + pushPair(reg, reg); > + move(imm, reg); > + store64(reg, stackPointerRegister); > + load64(Address(stackPointerRegister, 8), reg); Although the function name is descriptive, a comment that we use and then restore the contents of data temp register would be helpful. > Source/JavaScriptCore/ftl/FTLThunks.cpp:61 > + do { > + jit.pushToSave(GPRInfo::regT0); > + stackMisalignment += MacroAssembler::pushToSaveByteOffset(); > + numberOfRequiredPops++; > + } while (stackMisalignment % stackAlignmentBytes()); Why do we need to actually "push"? Can't we just calculate the amount we should move the stack pointer down by and do one subtract op? > Source/JavaScriptCore/ftl/FTLThunks.cpp:89 > + jit.popToRestore(GPRInfo::regT1); Do we really need to pop or can we just do an add to the stack pointer? 981517 3 fpizlo 2014-02-17 10:21:28 -0800 (In reply to comment #2) > (From update of attachment 224326 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=224326&action=review > > > Source/JavaScriptCore/assembler/MacroAssemblerARM64.h:1469 > > + RegisterID reg = getCachedDataTempRegisterIDAndInvalidate(); > > + pushPair(reg, reg); > > + move(imm, reg); > > + store64(reg, stackPointerRegister); > > + load64(Address(stackPointerRegister, 8), reg); > > Although the function name is descriptive, a comment that we use and then restore the contents of data temp register would be helpful. I guess the better thing would be not to call the getCachedDataTempRegisterIDAndInvalidate() method at all and just use *any* register directly. > > > Source/JavaScriptCore/ftl/FTLThunks.cpp:61 > > + do { > > + jit.pushToSave(GPRInfo::regT0); > > + stackMisalignment += MacroAssembler::pushToSaveByteOffset(); > > + numberOfRequiredPops++; > > + } while (stackMisalignment % stackAlignmentBytes()); > > Why do we need to actually "push"? Can't we just calculate the amount we should move the stack pointer down by and do one subtract op? This loop does the calculation as well. It's a trade-off. On x86, pushes are cheaper; on ARM, stack arithmetic is cheaper. I'm going for preserving behavior on x86 for niow. > > > Source/JavaScriptCore/ftl/FTLThunks.cpp:89 > > + jit.popToRestore(GPRInfo::regT1); > > Do we really need to pop or can we just do an add to the stack pointer? It's a trade-off. On x86, the pops are cheaper. 981519 4 224393 fpizlo 2014-02-17 10:26:24 -0800 Created attachment 224393 the patch 981525 5 224393 mhahnenberg 2014-02-17 10:35:20 -0800 Comment on attachment 224393 the patch r=me 981526 6 224393 msaboff 2014-02-17 10:36:26 -0800 Comment on attachment 224393 the patch View in context: https://bugs.webkit.org/attachment.cgi?id=224393&action=review r=me > Source/JavaScriptCore/assembler/MacroAssemblerARM64.h:1465 > + RegisterID reg = dataTempRegister; I don't have problems using getCachedDataTempRegisterIDAndInvalidate(). More grappling with how we push an immediate on ARM64. It just a little ugly that it takes a store pair, store, move multiple(s) and a load to push an immediate on ARM64 without impacting any GR. I did a quick look for other alternatives, but did find any. 981537 7 fpizlo 2014-02-17 10:54:16 -0800 Landed in http://trac.webkit.org/changeset/164228 224326 2014-02-16 18:10:27 -0800 2014-02-17 10:26:24 -0800 Patch bug-128890-20140216181024.patch text/plain 7464 fpizlo SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTY0MjAwKQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDI1IEBA CisyMDE0LTAyLTE2ICBGaWxpcCBQaXpsbyAgPGZwaXpsb0BhcHBsZS5jb20+CisKKyAgICAgICAg RlRMIE9TUiBleGl0IHNob3VsZG4ndCBtYWtlIFg4Ni1zcGVjaWZpYyBhc3N1bXB0aW9ucworICAg ICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MTI4ODkwCisKKyAg ICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgTW9zdGx5IHRoaXMg aXMgYWJvdXQgbm90IHVzaW5nIHB1c2gvcG9wLCBidXQgaW5zdGVhZCB1c2luZyB0aGUgbW9yZSBh 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