[LLVMdev] Using CallingConvLower in ARM target
Sandeep Patel
deeppatel1987 at gmail.com
Fri Feb 27 19:31:39 PST 2009
I'm not currently setup to be able to run the A/B comparison tests
that test-suite relies upon.
Fhourstones-3.1 looks to be the simplest. If you can send me the two
.o files from either EABI or Darwin, I can dig into why this went
wrong for you.
deep
On Thu, Feb 26, 2009 at 3:53 PM, Evan Cheng <echeng at apple.com> wrote:
> Sorry I haven't gotten back to you earlier. I have been busy.
>
> I ran some MultiSource/Benchmark earlier today. Looks like there are
> some failures: Fhourstones-3.1, Fhourstones, McCat/08-main, MiBench/
> consumer-lame, Olden/Power, Olden/voronoi, mafft/pairlocalign, and
> sim. Are you able to test them on your end?
>
> Evan
>
> On Feb 17, 2009, at 4:42 PM, Sandeep Patel wrote:
>
>> This time with the test cases actually attached.
>>
>> deep
>>
>> On Tue, Feb 17, 2009 at 4:41 PM, Sandeep Patel <deeppatel1987 at gmail.com
>> > wrote:
>>> On Mon, Feb 16, 2009 at 11:00 AM, Evan Cheng <evan.cheng at apple.com>
>>> wrote:
>>>> /// Information about how the value is assigned.
>>>> - LocInfo HTP : 7;
>>>> + LocInfo HTP : 6;
>>>>
>>>> Do you know why this change is needed? Are we running out of bits?
>>>
>>> HTP was't using all of these bits. I needed the hasCustom bit to come
>>> from somewhere unless we wanted to grow this struct, so I grabbed a
>>> bit from HTP.
>>>
>>>> - NeededStackSize = 4;
>>>> - break;
>>>> - case MVT::i64:
>>>> - case MVT::f64:
>>>> - if (firstGPR < 3)
>>>> - NeededGPRs = 2;
>>>> - else if (firstGPR == 3) {
>>>> - NeededGPRs = 1;
>>>> - NeededStackSize = 4;
>>>> - } else
>>>> - NeededStackSize = 8;
>>>> + State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT,
>>>> +
>>>> State.AllocateStack(4, 4),
>>>> + MVT::i32, LocInfo));
>>>> + return true; // we handled it
>>>>
>>>> Your change isn't handling the "NeededStackSize = 8" case.
>>>
>>> I believe it is. I've attached two additional test cases. The
>>> difference is that this case isn't handled by the CCCustomFns. They
>>> fail to allocate any regs and then handling falls through to an
>>> CCAssignToStack in ARMCallingConv.td. This is how other targets
>>> handle
>>> similar allocations.
>>>
>>>> ++ static const unsigned HiRegList[] = { ARM::R0, ARM::R2 };
>>>> + static const unsigned LoRegList[] = { ARM::R1, ARM::R3 };
>>>> +
>>>> + if (unsigned Reg = State.AllocateReg(HiRegList, LoRegList, 2)) {
>>>> + unsigned i;
>>>> + for (i = 0; i < 2; ++i)
>>>> + if (HiRegList[i] == Reg)
>>>> + break;
>>>> +
>>>> + State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg,
>>>> + MVT::i32, LocInfo));
>>>> + State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT,
>>>> LoRegList[i],
>>>> + MVT::i32, LocInfo));
>>>>
>>>> Since 'i' is used after the loop, please choose a better variable
>>>> name.
>>>>
>>>> Actually, is the loop necessary? We know the low register is always
>>>> one after the high register. Perhaps you can use
>>>> ARMRegisterInfo::getRegisterNumbering(Reg), add one to 1. And the
>>>> lookup the register enum with a new function (something like
>>>> getRegFromRegisterNum(RegNo, ValVT)).
>>>>
>>>> The patch is looking good. I need to run it through some more tests.
>>>> Unfortunately ARM target is a bit broken right now. I hope to fix it
>>>> today.
>>>
>>> I'll submit a revised patch after we've settled on the
>>> NeededStackSize=8 issue.
>>>
>>> deep
>>>
>>>> Thanks,
>>>>
>>>> Evan
>>>>
>>>> On Feb 13, 2009, at 8:27 PM, Sandeep Patel wrote:
>>>>
>>>>> Sorry left a small bit of cruft in ARMCallingConv.td. A corrected
>>>>> patch it attached.
>>>>>
>>>>> deep
>>>>>
>>>>> On Fri, Feb 13, 2009 at 6:41 PM, Sandeep Patel <deeppatel1987 at gmail.com
>>>>>> wrote:
>>>>>> Sure. Updated patches attached.
>>>>>>
>>>>>> deep
>>>>>>
>>>>>> On Fri, Feb 13, 2009 at 5:47 PM, Evan Cheng <evan.cheng at apple.com>
>>>>>> wrote:
>>>>>>>
>>>>>>> On Feb 13, 2009, at 4:25 PM, Sandeep Patel wrote:
>>>>>>>
>>>>>>>> ARMTargetLowering doesn't need case #1, but it seemed like you
>>>>>>>> and Dan
>>>>>>>> wanted a more generic way to inject C++ code into the process
>>>>>>>> so I
>>>>>>>> tried to make the mechanism a bit more general.
>>>>>>>
>>>>>>> Ok. Since ARM doesn't need it and it's the only client, I'd much
>>>>>>> rather have CCCustomFn just return a single bool indicating
>>>>>>> whether it
>>>>>>> can handle the arg. Would that be ok?
>>>>>>>
>>>>>>> Thanks,
>>>>>>>
>>>>>>> Evan
>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> deep
>>>>>>>>
>>>>>>>> On Fri, Feb 13, 2009 at 2:34 PM, Evan Cheng <evan.cheng at apple.com
>>>>>>>> >
>>>>>>>> wrote:
>>>>>>>>>
>>>>>>>>> On Feb 13, 2009, at 2:20 PM, Sandeep Patel wrote:
>>>>>>>>>
>>>>>>>>>> On Fri, Feb 13, 2009 at 12:33 PM, Evan Cheng <evan.cheng at apple.com
>>>>>>>>>>>
>>>>>>>>>> wrote:
>>>>>>>>>>>
>>>>>>>>>>> On Feb 12, 2009, at 6:21 PM, Sandeep Patel wrote:
>>>>>>>>>>>
>>>>>>>>>>>> Although it's not generally needed for ARM's use of
>>>>>>>>>>>> CCCustom, I
>>>>>>>>>>>> return
>>>>>>>>>>>> two bools to handle the four possible outcomes to keep the
>>>>>>>>>>>> mechanism
>>>>>>>>>>>> flexible:
>>>>>>>>>>>>
>>>>>>>>>>>> * if CCCustomFn handled the arg or not
>>>>>>>>>>>> * if CCCustomFn wants to end processing of the arg or not
>>>>>>>>>>>
>>>>>>>>>>> +/// CCCustomFn - This function assigns a location for Val,
>>>>>>>>>>> possibly
>>>>>>>>>>> updating
>>>>>>>>>>> +/// 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
>>>>>>>>>>> but it
>>>>>>>>>>> would
>>>>>>>>>>> not process any more arguments? What scenario do you envision
>>>>>>>>>>> that
>>>>>>>>>>> this will be useful? I'd rather keep it simple.
>>>>>>>>>>
>>>>>>>>>> As you note there are three actual legitimate cases (of the
>>>>>>>>>> four
>>>>>>>>>> combos):
>>>>>>>>>>
>>>>>>>>>> 1. The CCCustomFn wants the arg handling to proceed. This
>>>>>>>>>> might
>>>>>>>>>> be
>>>>>>>>>> used akin to CCPromoteToType.
>>>>>>>>>> 2. The CCCustomFn entirely handled the arg. This might be used
>>>>>>>>>> akin to
>>>>>>>>>> CCAssignToReg.
>>>>>>>>>> 3. The CCCustomFn tried to handle the arg, but failed.
>>>>>>>>>>
>>>>>>>>>> these results are conveyed the following ways:
>>>>>>>>>>
>>>>>>>>>> 1. The CCCustomFn returns false, &result is not used.
>>>>>>>>>> 2. The CCCustomFn returns true, &result is false;
>>>>>>>>>> 3. The CCCustomFn returns true, &result is true.
>>>>>>>>>
>>>>>>>>> I don't think we want to support #1. If the target want to add
>>>>>>>>> custom
>>>>>>>>> code to handle an argument, if should be responsible for
>>>>>>>>> outputting
>>>>>>>>> legal code. Is there an actual need to support #1?
>>>>>>>>>
>>>>>>>>> Evan
>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> I tried to keep these CCCustomFns looking like TableGen
>>>>>>>>>> generated
>>>>>>>>>> code. Suggestions of how to reorganize these results are
>>>>>>>>>> welcome. :-)
>>>>>>>>>> Perhaps better comments around the typedef for CCCustomFn
>>>>>>>>>> would
>>>>>>>>>> suffice?
>>>>>>>>>>
>>>>>>>>>> The isCustom flag is simply a means for this machinery to
>>>>>>>>>> convey to
>>>>>>>>>> the TargetLowering functions to process this arg specially. It
>>>>>>>>>> may
>>>>>>>>>> not
>>>>>>>>>> always be possible for the TargetLowering functions to
>>>>>>>>>> determine
>>>>>>>>>> that
>>>>>>>>>> the arg needs special handling after all the changes made by
>>>>>>>>>> the
>>>>>>>>>> CCCustomFn or CCPromoteToType and other transformations.
>>>>>>>>>>
>>>>>>>>>>>> I placed the "unsigned i" outside those loops because i is
>>>>>>>>>>>> used
>>>>>>>>>>>> after
>>>>>>>>>>>> the loop. If there's a better index search pattern, I'd be
>>>>>>>>>>>> happy
>>>>>>>>>>>> to
>>>>>>>>>>>> change it.
>>>>>>>>>>>
>>>>>>>>>>> Ok.
>>>>>>>>>>>
>>>>>>>>>>> One more nitpick:
>>>>>>>>>>>
>>>>>>>>>>> +/// CCCustom - calls a custom arg handling function
>>>>>>>>>>>
>>>>>>>>>>> Please capitalize "calls" and end with a period.
>>>>>>>>>>
>>>>>>>>>> Once we settle on the result handling changes, I'll submit an
>>>>>>>>>> update
>>>>>>>>>> with this change.
>>>>>>>>>>
>>>>>>>>>>> Thanks,
>>>>>>>>>>>
>>>>>>>>>>> Evan
>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> Attached is an updated patch against HEAD that has DebugLoc
>>>>>>>>>>>> changes. I
>>>>>>>>>>>> also split out the ARMAsmPrinter fix into it's own patch.
>>>>>>>>>>>>
>>>>>>>>>>>> deep
>>>>>>>>>>>>
>>>>>>>>>>>> On Mon, Feb 9, 2009 at 8:54 AM, Evan Cheng
>>>>>>>>>>>> <echeng at apple.com>
>>>>>>>>>>>> wrote:
>>>>>>>>>>>>> Thanks Sandeep. I did a quick scan, this looks really good.
>>>>>>>>>>>>> But I
>>>>>>>>>>>>> do
>>>>>>>>>>>>> have a question:
>>>>>>>>>>>>>
>>>>>>>>>>>>> +/// CCCustomFn - This function assigns a location for Val,
>>>>>>>>>>>>> possibly
>>>>>>>>>>>>> updating
>>>>>>>>>>>>> +/// 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; ++i)
>>>>>>>>>>>>>
>>>>>>>>>>>>> The convention we use is:
>>>>>>>>>>>>>
>>>>>>>>>>>>> + for (unsigned i = 0; i < 4; ++i)
>>>>>>>>>>>>>
>>>>>>>>>>>>> Thanks,
>>>>>>>>>>>>>
>>>>>>>>>>>>> Evan
>>>>>>>>>>>>>
>>>>>>>>>>>>> On Feb 6, 2009, at 6:02 PM, Sandeep Patel wrote:
>>>>>>>>>>>>>
>>>>>>>>>>>>>> I think I've got all the cases handled now, implementing
>>>>>>>>>>>>>> with
>>>>>>>>>>>>>> CCCustom<"foo"> callbacks into C++.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> This also fixes a crash when returning i128. I've also
>>>>>>>>>>>>>> included a
>>>>>>>>>>>>>> small asm constraint fix that was needed to build newlib.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> deep
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> On Mon, Jan 19, 2009 at 10:18 AM, Evan Cheng
>>>>>>>>>>>>>> <evan.cheng at apple.com>
>>>>>>>>>>>>>> wrote:
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> On Jan 16, 2009, at 5:26 PM, Sandeep Patel wrote:
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> On Sat, Jan 3, 2009 at 11:46 AM, Dan Gohman <gohman at apple.com
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> wrote:
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> One problem with this approach is that since i64 isn't
>>>>>>>>>>>>>>>>> legal,
>>>>>>>>>>>>>>>>> the
>>>>>>>>>>>>>>>>> bitcast would require custom C++ code in the ARM
>>>>>>>>>>>>>>>>> target to
>>>>>>>>>>>>>>>>> handle properly. It might make sense to introduce
>>>>>>>>>>>>>>>>> something
>>>>>>>>>>>>>>>>> like
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> CCIfType<[f64], CCCustom>
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> where CCCustom is a new entity that tells the calling
>>>>>>>>>>>>>>>>> convention
>>>>>>>>>>>>>>>>> code to to let the target do something not easily
>>>>>>>>>>>>>>>>> representable
>>>>>>>>>>>>>>>>> in the tablegen minilanguage.
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> I am thinking that this requires two changes: add a
>>>>>>>>>>>>>>>> flag to
>>>>>>>>>>>>>>>> CCValAssign (take a bit from HTP) to indicate isCustom
>>>>>>>>>>>>>>>> and a
>>>>>>>>>>>>>>>> way
>>>>>>>>>>>>>>>> to
>>>>>>>>>>>>>>>> author an arbitrary CCAction by including the source
>>>>>>>>>>>>>>>> directly in
>>>>>>>>>>>>>>>> the
>>>>>>>>>>>>>>>> TableGen mini-language. This latter change might want a
>>>>>>>>>>>>>>>> generic
>>>>>>>>>>>>>>>> change
>>>>>>>>>>>>>>>> to the TableGen language. For example, the syntax
>>>>>>>>>>>>>>>> might be
>>>>>>>>>>>>>>>> like:
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> class foo : CCCustomAction {
>>>>>>>>>>>>>>>> code <<< EOF
>>>>>>>>>>>>>>>> ....multi-line C++ code goes here that allocates regs
>>>>>>>>>>>>>>>> & mem
>>>>>>>>>>>>>>>> and
>>>>>>>>>>>>>>>> sets CCValAssign::isCustom....
>>>>>>>>>>>>>>>> EOF
>>>>>>>>>>>>>>>> }
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> Does this seem reasonable? An alternative is for
>>>>>>>>>>>>>>>> CCCustom
>>>>>>>>>>>>>>>> to
>>>>>>>>>>>>>>>> take a
>>>>>>>>>>>>>>>> string that names a function to be called:
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> CCIfType<[f64], CCCustom<"MyCustomLoweringFunc">>
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> 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:
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> I like the second 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
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> _______________________________________________
>>>>>>>>>>>>>>> LLVM Developers mailing list
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>>>>>>>>>>>>>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>> <
>>>>>>>>>>>>>> arm_callingconv
>>>>>>>>>>>>>> .diff>_______________________________________________
>>>>>>>>>>>>>> LLVM Developers mailing list
>>>>>>>>>>>>>> LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu
>>>>>>>>>>>>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>>>>>>>>>>>
>>>>>>>>>>>>> _______________________________________________
>>>>>>>>>>>>> LLVM Developers mailing list
>>>>>>>>>>>>> LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu
>>>>>>>>>>>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>>>>>>>>>>>
>>>>>>>>>>>> <
>>>>>>>>>>>> arm_callingconv
>>>>>>>>>>>> .diff
>>>>>>>>>>>>> <
>>>>>>>>>>>>> arm_fixes
>>>>>>>>>>>>> .diff>_______________________________________________
>>>>>>>>>>>> LLVM Developers mailing list
>>>>>>>>>>>> LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu
>>>>>>>>>>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>>>>>>>>>
>>>>>>>>>>> _______________________________________________
>>>>>>>>>>> LLVM Developers mailing list
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>>>>>>>>>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>>>>>>>>>
>>>>>>>>>> _______________________________________________
>>>>>>>>>> LLVM Developers mailing list
>>>>>>>>>> LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu
>>>>>>>>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>>>> LLVM Developers mailing list
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>>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> LLVM Developers mailing list
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>>>>>>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> LLVM Developers mailing list
>>>>>>> LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu
>>>>>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>>>>>
>>>>>>
>>>>> <
>>>>> arm_callingconv
>>>>> .diff
>>>>> ><arm_fixes.diff>_______________________________________________
>>>>> LLVM Developers mailing list
>>>>> LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu
>>>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>>
>>>> _______________________________________________
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>>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>>
>>>
>> <
>> arm_stack64_tests.diff>_______________________________________________
>> LLVM Developers mailing list
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>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
> _______________________________________________
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