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Received: from DU2PR04MB8790.eurprd04.prod.outlook.com (2603:10a6:10:2e1::23) by PAXPR04MB8458.eurprd04.prod.outlook.com (2603:10a6:102:1d9::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7002.17; Wed, 15 Nov 2023 08:52:25 +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 15.20.7002.019; Wed, 15 Nov 2023 08:52:25 +0000 Message-ID: <5c3a03b9-86a0-4982-a88c-f1d7ac8e229e@suse.com> Date: Wed, 15 Nov 2023 09:52:23 +0100 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] Reorder APX insns in i386.tbl Content-Language: en-US To: "Hu, Lin1" Cc: "Lu, Hongjiu" , "binutils@sourceware.org" References: <20231114025856.863065-1-lin1.hu@intel.com> From: Jan Beulich Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL In-Reply-To: Content-Type: text/plain; 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binutils@sourceware.org >> Subject: Re: [PATCH 1/2] Reorder APX insns in i386.tbl >> >> On 14.11.2023 03:58, Hu, Lin1 wrote: >>> --- >>> gas/config/tc-i386.c | 4 +- >>> opcodes/i386-opc.tbl | 156 +- >>> 5 files changed, 13189 insertions(+), 10771 deletions(-) >> >> What was the goal of sending this patch to the list, without any further >> comments or explanations? It quite clearly doesn't apply to the present code >> base. >> >> The diffstat is pretty odd, too: There clearly aren't as many files/lines changed. > > This patch is just to show you the changes I would need to make if I reorder .tbl, the big difference in lines is because I removed the changes to mnem.h, init.h, etc. in the email. Okay, but this isn't going to be a separate patch. It ought to be merged into the patch introducing the new templates, so there's not going to be extra diff or churn. >>> @@ -2124,12 +2126,12 @@ xcryptofb, 0xf30fa7e8, PadLock, >>> NoSuf|RepPrefixOk, {} xstore, 0xfa7c0, PadLock, NoSuf|RepPrefixOk, {} >>> >>> // Multy-precision Add Carry, rdseed instructions. >>> +adcx, 0x6666, ADX|APX_F, >>> >> +C|Modrm|CheckOperandSize|IgnoreSize|No_bSuf|No_wSuf|No_sSuf|VexVVV >> VDe >>> +st|EVex128|EVexMap4, { Reg32|Reg64|Unspecified|BaseIndex, >>> +Reg32|Reg64, Reg32|Reg64 } >>> adcx, 0x660f38f6, ADX, >>> Modrm|CheckOperandSize|IgnoreSize|No_bSuf|No_wSuf|No_sSuf, { >>> Reg32|Reg64|Unspecified|BaseIndex, Reg32|Reg64 } adcx, 0x6666, >>> ADX|APX_F, >>> >> Modrm|CheckOperandSize|IgnoreSize|No_bSuf|No_wSuf|No_sSuf|EVex128|E >> Vex >>> Map4, { Reg32|Reg64|Unspecified|BaseIndex, Reg32|Reg64 } -adcx, >>> 0x6666, ADX|APX_F, >>> >> Modrm|CheckOperandSize|IgnoreSize|No_bSuf|No_wSuf|No_sSuf|VexVVVVD >> est| >>> EVex128|EVexMap4, { Reg32|Reg64|Unspecified|BaseIndex, Reg32|Reg64, >>> Reg32|Reg64 } >>> +adox, 0xf366, ADX|APX_F, >>> >> +C|Modrm|CheckOperandSize|IgnoreSize|No_bSuf|No_wSuf|No_sSuf|VexVVV >> VDe >>> +st|EVex128|EVexMap4, { Reg32|Reg64|Unspecified|BaseIndex, >>> +Reg32|Reg64, Reg32|Reg64 } >>> adox, 0xf30f38f6, ADX, >>> Modrm|CheckOperandSize|IgnoreSize|No_bSuf|No_wSuf|No_sSuf, { >>> Reg32|Reg64|Unspecified|BaseIndex, Reg32|Reg64 } adox, 0xf366, >>> ADX|APX_F, >>> >> Modrm|CheckOperandSize|IgnoreSize|No_bSuf|No_wSuf|No_sSuf|EVex128|E >> Vex >>> Map4, { Reg32|Reg64|Unspecified|BaseIndex, Reg32|Reg64 } -adox, >>> 0xf366, ADX|APX_F, >>> >> Modrm|CheckOperandSize|IgnoreSize|No_bSuf|No_wSuf|No_sSuf|VexVVVVD >> est| >>> EVex128|EVexMap4, { Reg32|Reg64|Unspecified|BaseIndex, Reg32|Reg64, >>> Reg32|Reg64 } >> >> What is this part about? I thought we agreed that ADCX/ADOX aren't suitable for >> NDD->REX2 optimization, at which point the ordering of templates here could as >> well be left alone. >> > 62 54 bd 18 66 c7 adcx %r15,%r8,%r8 > 66 4d 0f 38 f6 c7 adcx %r15,%r8 > > The code can optimize adcx/adox from NDD to legacy, currently. Do you mean we don't consider the optimization If the code length remain the same? As said before, any optimization we do has to actually result in some sort of win. If neither performance nor code size change, there's no point in making any adjustments to what the user has written. That said, though: Looks like there would still be a 1-byte win for 32-bit ADCX/ADOX with just the low 8 registers used as operands, i.e. when no REX prefix is needed in the encoding. Jan