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Received: from DU2PR04MB8790.eurprd04.prod.outlook.com (2603:10a6:10:2e1::23) by GVXPR04MB9927.eurprd04.prod.outlook.com (2603:10a6:150:118::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7068.13; Thu, 30 Nov 2023 09:02:10 +0000 Received: from DU2PR04MB8790.eurprd04.prod.outlook.com ([fe80::eb8e:fa24:44c1:5d44]) by DU2PR04MB8790.eurprd04.prod.outlook.com ([fe80::eb8e:fa24:44c1:5d44%3]) with mapi id 15.20.7068.012; Thu, 30 Nov 2023 09:02:09 +0000 Message-ID: <933e49a0-f8cf-4797-ba67-a3f9e47bd6c1@suse.com> Date: Thu, 30 Nov 2023 10:02:09 +0100 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] Support APX PUSHP/POPP Content-Language: en-US To: "Cui, Lili" Cc: "Lu, Hongjiu" , "ccoutant@gmail.com" , "binutils@sourceware.org" References: <20231127123106.3600817-1-lili.cui@intel.com> <4f005f5c-52c4-4631-bee7-6396add7c5df@suse.com> <3abc4b98-59ab-48b4-8690-99d00e55ad1f@suse.com> <8858e7c5-97b2-4ec4-bd21-6371f92493bb@suse.com> <83c937ed-48e4-4f38-96ec-aab662ae97ac@suse.com> <3482ec71-fb14-43a0-b132-776439f1f282@suse.com> From: Jan Beulich Autocrypt: addr=jbeulich@suse.com; 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>>>>>>>>> } >>>>>>>>> >>>>>>>>> + /* PUSHP/POPP requires rex2.w == 1. */ if (i.tm.mnem_off == >>>>>>>>> + MN_pushp || i.tm.mnem_off == MN_popp) >>>>>>>>> + { >>>>>>>>> + i.rex2_encoding = true; >>>>>>>>> + i.rex |= REX_W; >>>>>>>>> + } >>>>>>>> >>>>>>>> Well, I'm sorry for not considering JMPABS earlier on, but with >>>>>>>> that also needing dealing with, I think I view my alternative >>>>>>>> suggestion as >>>>>> preferable. >>>>>>>> That'll scale better when also considering that down the road >>>>>>>> further such insns may appear. Whether it's actually >>>>>>>> OperandConstraint that we leverage here is secondary (it's not >>>>>>>> ideal because there's nothing >>>>>> operand related here). >>>>>>>> I'd be perfectly okay with some other attribute being suitably >>>>>>>> overloaded, whereas I continue to think that introducing new >>>>>>>> attributes should preferably be limited to either cases where >>>>>>>> more than just two or three templates use them or cases where >>>>>>>> otherwise it's impossible to avoid ambiguities. From earlier >>>>>>>> changes of mine the underlying reason ought to be pretty clear: >>>>>>>> Each new attribute consumes storage, and with thousands of >>>>>>>> templates growth of storage requirements should be balanced with >>>>>>>> how frequently an attribute is actually going to have a non-zero >>>>>>>> value. For example, with >>>>>>>> is_evex_encoding() gone a brief inspection suggests that it might >>>>>>>> be possible to overload Masking (or maybe Broadcast): They're >>>>>>>> applicable to EVEX templates only, and the class of insns we're >>>>>>>> discussing here is never going to be EVEX (or VEX). IOW not much >>>>>>>> different from the overloading of StaticRounding. Such an >>>>>>>> overload may then well be named Rex2 (as you had it, and >>>>>>>> considering its intended use also for >>>>>> JMPABS, plus taking into consideration that REX2.W will be set >>>>>> simply because of the absence of NoRex64). >>>>>>>> >>>>>>> >>>>>>> Haha, StaticRounding is really special, I tried "#define Rex2Req >>>>>>> Masking" and >>>>>> found that it will be used in i386-gen.c to identify EVEX >>>>>> (Broadcast...), then I tried VexW and SIB found that they are all >>>>>> used without precheck whether it was an vex instruction. Finally I >>>>>> wanted to re-use StaticRounding and found out that hulin already >>>>>> uses it >>>> for legacy insns. >>>>>> >>>>>> Hmm, I'm sorry for the trouble. I'm inclined to say >>>>>> OperandConstraint with a new #define it is then. >> >> Did you miss this before ... >> >>>>>> Once everything's in I could then >>>>>> still see whether I can >>>>>> (reasonably) make e.g. Masking work here. >>>>>> >>>>> >>>>> Then I will create a new attribute Rex2 for it. >> >> ... saying this and ... >> >>>> ??? >>>> >>> >>> I can't use "#define Rex2Req Masking" instead of creating a new bitfile for >> Rex2Req, then I have to create a new bitfile for Rex2Req , or you want to use >> i.tm.mnem_off to handle it? both are ok to me. >> >> ... this? IOW something along the lines of >> >> #define Rex2 OperandConstraint=REX2 >> >> (REX2 may be too short a name for the necessary new #define). >> >> And as indicated I'd subsequently see about reusing Masking (or some other >> of the EVEX-only attributes) anyway. >> > > Oh, I didn't understand OperandConstraint correctly. REX2 conflict with "pseudopfx: rex2:REX2:APX_F", I changed it to REX2_PREFIX( or, REX_REQ ?). > > #define Rex2 OperandConstraint=REX2_PREFIX REX2_REQUIRED perhaps? Jan