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...changes and indicates if it handled it. It > must set > +/// isCustom if it handles the arg and returns true. > +typedef bool CCCustomFn(unsigned &ValNo, MVT &ValVT, > + MVT &LocVT, CCValAssign::LocInfo &LocInfo, > + ISD::ArgFlagsTy &ArgFlags, CCState &State, > + bool &result); > > Is it necessary to return two bools (the second is returned by > reference in 'result')? I am confused about the semantics of 'result'. > > Also, a nitpick: > > + unsig...

.../// all args to reflect changes and indicates if it handled it. It must set +/// isCustom if it handles the arg and returns true. +typedef bool CCCustomFn(unsigned &ValNo, MVT &ValVT, + MVT &LocVT, CCValAssign::LocInfo &LocInfo, + ISD::ArgFlagsTy &ArgFlags, CCState &State, + bool &result); Is "result" what you refer to as "isCustom" in the comments? Sorry, I am still confused. You mean it could return true but set 'result' to false? That means it has handled the argument...

...changes and indicates if it handled it. It > must set > +/// isCustom if it handles the arg and returns true. > +typedef bool CCCustomFn(unsigned &ValNo, MVT &ValVT, > + MVT &LocVT, CCValAssign::LocInfo &LocInfo, > + ISD::ArgFlagsTy &ArgFlags, CCState &State, > + bool &result); > > Is "result" what you refer to as "isCustom" in the comments? > > Sorry, I am still confused. You mean it could return true but set > 'result' to false? That means it...

...> Right before the call to LowerOperation for the ISD::CALL node the DAG looks like this: SelectionDAG has 23 nodes: 0x97a3c78: ch = EntryToken 0x97a43e0: <multiple use> 0x97a41a0: <multiple use> 0x97a3cd8: i32 = extract_element 0x97a43e0, 0x97a41a0 0x97a3d30: ch = ArgFlags < zext orig-align:8 > 0x97a3d68: ch = ArgFlags < zext orig-align:1 > 0x97a3c78: <multiple use> 0x97a41a0: <multiple use> 0x97a41a0: <multiple use> 0x97a41a0: <multiple use> 0x97a4168: i32 = ExternalSymbol '__unorddf2' 0x97a3cd8:...

...econd solution better. It seems rather cumbersome to embed > multi-line c++ code in td files. > > Evan >> >> >> typedef bool CCCustomFn(unsigned ValNo, MVT ValVT, >> MVT LocVT, CCValAssign::LocInfo LocInfo, >> ISD::ArgFlagsTy ArgFlags, CCState &State, >> bool &result); >> _______________________________________________ >> LLVM Developers mailing list >> LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu >> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev > > __________...

...It >>> must set >>> +/// isCustom if it handles the arg and returns true. >>> +typedef bool CCCustomFn(unsigned &ValNo, MVT &ValVT, >>> + MVT &LocVT, CCValAssign::LocInfo &LocInfo, >>> + ISD::ArgFlagsTy &ArgFlags, CCState &State, >>> + bool &result); >>> >>> Is "result" what you refer to as "isCustom" in the comments? >>> >>> Sorry, I am still confused. You mean it could return true but set >&...

...es if it handled it. It >> must set >> +/// isCustom if it handles the arg and returns true. >> +typedef bool CCCustomFn(unsigned &ValNo, MVT &ValVT, >> + MVT &LocVT, CCValAssign::LocInfo &LocInfo, >> + ISD::ArgFlagsTy &ArgFlags, CCState &State, >> + bool &result); >> >> Is "result" what you refer to as "isCustom" in the comments? >> >> Sorry, I am still confused. You mean it could return true but set >> 'result'...

.../// all args to reflect changes and indicates if it handled it. It must set +/// isCustom if it handles the arg and returns true. +typedef bool CCCustomFn(unsigned &ValNo, MVT &ValVT, + MVT &LocVT, CCValAssign::LocInfo &LocInfo, + ISD::ArgFlagsTy &ArgFlags, CCState &State, + bool &result); Is it necessary to return two bools (the second is returned by reference in 'result')? I am confused about the semantics of 'result'. Also, a nitpick: + unsigned i; + for (i = 0; i < 4; +...

On Jul 1, 2008, at 3:42 PM, Richard Osborne wrote: > Evan Cheng wrote: >> On Jun 25, 2008, at 5:13 AM, Richard Osborne wrote: >> >> >>> Evan Cheng wrote: >>> >>>> On Jun 23, 2008, at 5:35 AM, Richard Osborne wrote: >>>> >>>> >>>>> I'm trying to write a backend for a target with no hardware

...t;>>> +/// isCustom if it handles the arg and returns true. >>>>> +typedef bool CCCustomFn(unsigned &ValNo, MVT &ValVT, >>>>> + MVT &LocVT, CCValAssign::LocInfo &LocInfo, >>>>> + ISD::ArgFlagsTy &ArgFlags, CCState &State, >>>>> + bool &result); >>>>> >>>>> Is "result" what you refer to as "isCustom" in the comments? >>>>> >>>>> Sorry, I am still confused. You...

...must set >>>> +/// isCustom if it handles the arg and returns true. >>>> +typedef bool CCCustomFn(unsigned &ValNo, MVT &ValVT, >>>> + MVT &LocVT, CCValAssign::LocInfo &LocInfo, >>>> + ISD::ArgFlagsTy &ArgFlags, CCState &State, >>>> + bool &result); >>>> >>>> Is "result" what you refer to as "isCustom" in the comments? >>>> >>>> Sorry, I am still confused. You mean it could retur...

...> the function signature for such functions will have to return two results: if the CC processing is finished and if it the func succeeded or failed: typedef bool CCCustomFn(unsigned ValNo, MVT ValVT, MVT LocVT, CCValAssign::LocInfo LocInfo, ISD::ArgFlagsTy ArgFlags, CCState &State, bool &result);

...returns true. >>>>>>> +typedef bool CCCustomFn(unsigned &ValNo, MVT &ValVT, >>>>>>> + MVT &LocVT, CCValAssign::LocInfo >>>>>>> &LocInfo, >>>>>>> + ISD::ArgFlagsTy &ArgFlags, CCState >>>>>>> &State, >>>>>>> + bool &result); >>>>>>> >>>>>>> Is "result" what you refer to as "isCustom" in the comments? >>>>&g...

...t; +/// isCustom if it handles the arg and returns true. >>>>>> +typedef bool CCCustomFn(unsigned &ValNo, MVT &ValVT, >>>>>> + MVT &LocVT, CCValAssign::LocInfo &LocInfo, >>>>>> + ISD::ArgFlagsTy &ArgFlags, CCState &State, >>>>>> + bool &result); >>>>>> >>>>>> Is "result" what you refer to as "isCustom" in the comments? >>>>>> >>>>>> Sorry, I am...

...register classes, but fail to do this. I am surprised to see no pointer type in the initial DAG and both these programs get arguments of i16: int fun(int a, int b) { return a+b;} int funp(int *a, int *b) { return *a+*b;} The arguments get the same MVT::i16, and as well - surprisingly - the same ArgFlags.Flags for both programs. Thus I cannot make a customization that is required. I suppose the Flags bitmap should indicate this, why does it not? How can I solve this problem? /Jonas

...>>>>>>>> +typedef bool CCCustomFn(unsigned &ValNo, MVT &ValVT, >>>>>>>> + MVT &LocVT, CCValAssign::LocInfo >>>>>>>> &LocInfo, >>>>>>>> + ISD::ArgFlagsTy &ArgFlags, CCState >>>>>>>> &State, >>>>>>>> + bool &result); >>>>>>>> >>>>>>>> Is "result" what you refer to as "isCustom" in the comments? >...

Evan Cheng wrote: > On Jun 25, 2008, at 5:13 AM, Richard Osborne wrote: > > >> Evan Cheng wrote: >> >>> On Jun 23, 2008, at 5:35 AM, Richard Osborne wrote: >>> >>> >>>> I'm trying to write a backend for a target with no hardware floating >>>> point support. I've added a single i32 register class. I'm

...>>>>> +typedef bool CCCustomFn(unsigned &ValNo, MVT &ValVT, >>>>>>>>> + MVT &LocVT, CCValAssign::LocInfo >>>>>>>>> &LocInfo, >>>>>>>>> + ISD::ArgFlagsTy &ArgFlags, CCState >>>>>>>>> &State, >>>>>>>>> + bool &result); >>>>>>>>> >>>>>>>>> Is "result" what you refer to as "isCustom" in th...

...ve always felt was a bit clunky. Calling convention lowering in LLVM is typically handled by functions conforming to the CCAssignFn typedef: typedef bool CCAssignFn(unsigned ValNo, MVT ValVT, MVT LocVT, CCValAssign::LocInfo LocInfo, ISD::ArgFlagsTy ArgFlags, CCState &State); Notably, these functions are called after type legalisation so an argument/ret has been split to legal value types. In some cases you want more information than is available through this function interface, which leads to a number of backends creating their own CC...

...specifies that i16's are returned in i32's. When code is generated for @f this means that you get something like: 0x2696eb8: i16,ch = ... <= the i16 value 0x2696fb0: i32 = sign_extend 0x2696eb8 <= sign extended to i32 0x26970a8: ch = ArgFlags < > 0x26971a0: ch = ret 0x2696ad8, 0x2696fb0, 0x26970a8 <= here returned Perfect! Ciao, Duncan.