From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-oo1-xc34.google.com (mail-oo1-xc34.google.com [IPv6:2607:f8b0:4864:20::c34]) by sourceware.org (Postfix) with ESMTPS id 792A13851C39 for ; Wed, 24 Mar 2021 18:04:08 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 792A13851C39 Received: by mail-oo1-xc34.google.com with SMTP id n12-20020a4ad12c0000b02901b63e7bc1b4so6037610oor.5 for ; Wed, 24 Mar 2021 11:04:08 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to; bh=c7NgR5Lk7MhnSwdz5S0ZaAYWcAWxJOhZWn4ylPxEgfM=; b=DUZCdxPgwHuWqxvOrlRax+3EvgAB71Ldeg5+8fjOTmTDTalvdnFbXuxE2uZYpqG9JS BeJT0ebTrv0e6ITTBUUAmBTE3Dptyz/8ZLtECPYItlnQMcHZl5CZ3MxE4t/8epQHSpdh 194f5tGVzTKTDAd1r32fspCNOwpAklJq13z3kObz6CSAuQ8DNWsM8A5b2zgBGGnSKMCP SIZht4IbimkmnaoXhnbP2nz0ivSYtQmq/0dGF4hTCcBFf9SqKsOwOK0YwzK6sQCSGDCt XY/XZUGIgtZTzapmiX6iAqAh0XG6i0tAarkWvMo7K72sZPfby/5Kvte2KmgjuuSAmJDr l9hA== X-Gm-Message-State: AOAM533IF8vN9+3Ie8YQWgTtBqpeH6BdqziTHAfdsYkJ1ktGPMkc2UYa ruAz8QMFKVxYt+gurWBmZNRXTau9BZMzlM33Ef9Ib73WiFs= X-Google-Smtp-Source: ABdhPJwW8n27b1ELztRs0ItonvNT/xOy77uzzvBz5ZxhKtOECSJENYrnz7VtNcVaXXVViiUr9l3XRdyiQxFpk3pxhvk= X-Received: by 2002:a4a:d1da:: with SMTP id a26mr3824719oos.58.1616609047338; Wed, 24 Mar 2021 11:04:07 -0700 (PDT) MIME-Version: 1.0 References: <20210315142520.1661407-1-hjl.tools@gmail.com> In-Reply-To: <20210315142520.1661407-1-hjl.tools@gmail.com> From: "H.J. Lu" Date: Wed, 24 Mar 2021 11:03:31 -0700 Message-ID: Subject: Re: [PATCH v2 00/10] x86-64: Avoid RTM abort inside a RTM region To: GNU C Library Content-Type: text/plain; charset="UTF-8" X-Spam-Status: No, score=-3029.0 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 Mar 2021 18:04:11 -0000 On Mon, Mar 15, 2021 at 7:25 AM H.J. Lu wrote: > > Changes in v2: > > 1. Don't use YMM2 in EVEX strcpy/strcat. > 2. Correct EVEX mempcpy listing. > 3. Use ZMM16-ZMM31 in AVX512 memmove/memset family functions. > > --- > Since VZEROUPPER triggers RTM abort inside a transactionally executing > RTM region, avoid VZEROUPPER inside a RTM region in string/memory > functions: > > 1. Turn on Prefer_No_VZEROUPPER for processors with RTM. > 2. Select functions optimized with 256-bit EVEX instructions using > YMM16-YMM31 registers, which don't need VZEROUPPER at function exit. > 3. Select AVX optimized string/memory functions with > > xtest > jz 1f > vzeroall > ret > 1: > vzeroupper > ret > > at function exit on processors with RTM, but without 256-bit EVEX > instructions. > 4. Since to compare 2 32-byte strings, 256-bit EVEX strcmp requires 2 > loads, 3 VPCMPs and 2 KORDs while AVX2 strcmp requires 1 load, 2 VPCMPEQs, > 1 VPMINU and 1 VPMOVMSKB, AVX2 strcmp is faster than EVEX strcmp. Add > Prefer_AVX2_STRCMP to prefer AVX2 strcmp family functions. > 5. Add tests to verify that string/memory functions won't cause RTM abort > in RTM region. > 6. Use ZMM16-ZMM31 in AVX512 memmove/memset family functions. > > H.J. Lu (10): > x86: Set Prefer_No_VZEROUPPER and add Prefer_AVX2_STRCMP > x86-64: Add ifunc-avx2.h functions with 256-bit EVEX > x86-64: Add strcpy family functions with 256-bit EVEX > x86-64: Add memmove family functions with 256-bit EVEX > x86-64: Add memset family functions with 256-bit EVEX > x86-64: Add memcmp family functions with 256-bit EVEX > x86-64: Add AVX optimized string/memory functions for RTM > x86: Add string/memory function tests in RTM region > x86-64: Use ZMM16-ZMM31 in AVX512 memset family functions > x86-64: Use ZMM16-ZMM31 in AVX512 memmove family functions > > sysdeps/x86/Makefile | 23 + > sysdeps/x86/cpu-features.c | 20 +- > sysdeps/x86/cpu-tunables.c | 2 + > ...cpu-features-preferred_feature_index_1.def | 1 + > sysdeps/x86/tst-memchr-rtm.c | 54 + > sysdeps/x86/tst-memcmp-rtm.c | 52 + > sysdeps/x86/tst-memmove-rtm.c | 53 + > sysdeps/x86/tst-memrchr-rtm.c | 54 + > sysdeps/x86/tst-memset-rtm.c | 45 + > sysdeps/x86/tst-strchr-rtm.c | 54 + > sysdeps/x86/tst-strcpy-rtm.c | 53 + > sysdeps/x86/tst-string-rtm.h | 72 ++ > sysdeps/x86/tst-strlen-rtm.c | 53 + > sysdeps/x86/tst-strncmp-rtm.c | 52 + > sysdeps/x86/tst-strrchr-rtm.c | 53 + > sysdeps/x86_64/multiarch/Makefile | 58 +- > sysdeps/x86_64/multiarch/ifunc-avx2.h | 18 +- > sysdeps/x86_64/multiarch/ifunc-impl-list.c | 381 +++++- > sysdeps/x86_64/multiarch/ifunc-memcmp.h | 17 +- > sysdeps/x86_64/multiarch/ifunc-memmove.h | 45 +- > sysdeps/x86_64/multiarch/ifunc-memset.h | 49 +- > sysdeps/x86_64/multiarch/ifunc-strcpy.h | 17 +- > sysdeps/x86_64/multiarch/ifunc-wmemset.h | 22 +- > sysdeps/x86_64/multiarch/memchr-avx2-rtm.S | 12 + > sysdeps/x86_64/multiarch/memchr-avx2.S | 45 +- > sysdeps/x86_64/multiarch/memchr-evex.S | 381 ++++++ > .../x86_64/multiarch/memcmp-avx2-movbe-rtm.S | 12 + > sysdeps/x86_64/multiarch/memcmp-avx2-movbe.S | 28 +- > sysdeps/x86_64/multiarch/memcmp-evex-movbe.S | 440 +++++++ > .../memmove-avx-unaligned-erms-rtm.S | 17 + > .../multiarch/memmove-avx512-unaligned-erms.S | 25 +- > .../multiarch/memmove-evex-unaligned-erms.S | 33 + > .../multiarch/memmove-vec-unaligned-erms.S | 57 +- > sysdeps/x86_64/multiarch/memrchr-avx2-rtm.S | 12 + > sysdeps/x86_64/multiarch/memrchr-avx2.S | 53 +- > sysdeps/x86_64/multiarch/memrchr-evex.S | 337 ++++++ > .../memset-avx2-unaligned-erms-rtm.S | 10 + > .../multiarch/memset-avx2-unaligned-erms.S | 12 +- > .../multiarch/memset-avx512-unaligned-erms.S | 16 +- > .../multiarch/memset-evex-unaligned-erms.S | 24 + > .../multiarch/memset-vec-unaligned-erms.S | 61 +- > sysdeps/x86_64/multiarch/rawmemchr-avx2-rtm.S | 4 + > sysdeps/x86_64/multiarch/rawmemchr-evex.S | 4 + > sysdeps/x86_64/multiarch/stpcpy-avx2-rtm.S | 3 + > sysdeps/x86_64/multiarch/stpcpy-evex.S | 3 + > sysdeps/x86_64/multiarch/stpncpy-avx2-rtm.S | 4 + > sysdeps/x86_64/multiarch/stpncpy-evex.S | 4 + > sysdeps/x86_64/multiarch/strcat-avx2-rtm.S | 12 + > sysdeps/x86_64/multiarch/strcat-avx2.S | 6 +- > sysdeps/x86_64/multiarch/strcat-evex.S | 283 +++++ > sysdeps/x86_64/multiarch/strchr-avx2-rtm.S | 12 + > sysdeps/x86_64/multiarch/strchr-avx2.S | 28 +- > sysdeps/x86_64/multiarch/strchr-evex.S | 335 ++++++ > sysdeps/x86_64/multiarch/strchr.c | 17 +- > sysdeps/x86_64/multiarch/strchrnul-avx2-rtm.S | 3 + > sysdeps/x86_64/multiarch/strchrnul-evex.S | 3 + > sysdeps/x86_64/multiarch/strcmp-avx2-rtm.S | 12 + > sysdeps/x86_64/multiarch/strcmp-avx2.S | 55 +- > sysdeps/x86_64/multiarch/strcmp-evex.S | 1043 +++++++++++++++++ > sysdeps/x86_64/multiarch/strcmp.c | 19 +- > sysdeps/x86_64/multiarch/strcpy-avx2-rtm.S | 12 + > sysdeps/x86_64/multiarch/strcpy-avx2.S | 85 +- > sysdeps/x86_64/multiarch/strcpy-evex.S | 1003 ++++++++++++++++ > sysdeps/x86_64/multiarch/strlen-avx2-rtm.S | 12 + > sysdeps/x86_64/multiarch/strlen-avx2.S | 43 +- > sysdeps/x86_64/multiarch/strlen-evex.S | 436 +++++++ > sysdeps/x86_64/multiarch/strncat-avx2-rtm.S | 3 + > sysdeps/x86_64/multiarch/strncat-evex.S | 3 + > sysdeps/x86_64/multiarch/strncmp-avx2-rtm.S | 3 + > sysdeps/x86_64/multiarch/strncmp-evex.S | 3 + > sysdeps/x86_64/multiarch/strncmp.c | 19 +- > sysdeps/x86_64/multiarch/strncpy-avx2-rtm.S | 3 + > sysdeps/x86_64/multiarch/strncpy-evex.S | 3 + > sysdeps/x86_64/multiarch/strnlen-avx2-rtm.S | 4 + > sysdeps/x86_64/multiarch/strnlen-evex.S | 4 + > sysdeps/x86_64/multiarch/strrchr-avx2-rtm.S | 12 + > sysdeps/x86_64/multiarch/strrchr-avx2.S | 19 +- > sysdeps/x86_64/multiarch/strrchr-evex.S | 265 +++++ > sysdeps/x86_64/multiarch/wcschr-avx2-rtm.S | 3 + > sysdeps/x86_64/multiarch/wcschr-evex.S | 3 + > sysdeps/x86_64/multiarch/wcscmp-avx2-rtm.S | 4 + > sysdeps/x86_64/multiarch/wcscmp-evex.S | 4 + > sysdeps/x86_64/multiarch/wcslen-avx2-rtm.S | 4 + > sysdeps/x86_64/multiarch/wcslen-evex.S | 4 + > sysdeps/x86_64/multiarch/wcsncmp-avx2-rtm.S | 5 + > sysdeps/x86_64/multiarch/wcsncmp-evex.S | 5 + > sysdeps/x86_64/multiarch/wcsnlen-avx2-rtm.S | 5 + > sysdeps/x86_64/multiarch/wcsnlen-evex.S | 5 + > sysdeps/x86_64/multiarch/wcsnlen.c | 18 +- > sysdeps/x86_64/multiarch/wcsrchr-avx2-rtm.S | 3 + > sysdeps/x86_64/multiarch/wcsrchr-evex.S | 3 + > sysdeps/x86_64/multiarch/wmemchr-avx2-rtm.S | 4 + > sysdeps/x86_64/multiarch/wmemchr-evex.S | 4 + > .../x86_64/multiarch/wmemcmp-avx2-movbe-rtm.S | 4 + > sysdeps/x86_64/multiarch/wmemcmp-evex-movbe.S | 4 + > sysdeps/x86_64/sysdep.h | 22 + > 96 files changed, 6372 insertions(+), 337 deletions(-) > create mode 100644 sysdeps/x86/tst-memchr-rtm.c > create mode 100644 sysdeps/x86/tst-memcmp-rtm.c > create mode 100644 sysdeps/x86/tst-memmove-rtm.c > create mode 100644 sysdeps/x86/tst-memrchr-rtm.c > create mode 100644 sysdeps/x86/tst-memset-rtm.c > create mode 100644 sysdeps/x86/tst-strchr-rtm.c > create mode 100644 sysdeps/x86/tst-strcpy-rtm.c > create mode 100644 sysdeps/x86/tst-string-rtm.h > create mode 100644 sysdeps/x86/tst-strlen-rtm.c > create mode 100644 sysdeps/x86/tst-strncmp-rtm.c > create mode 100644 sysdeps/x86/tst-strrchr-rtm.c > create mode 100644 sysdeps/x86_64/multiarch/memchr-avx2-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/memchr-evex.S > create mode 100644 sysdeps/x86_64/multiarch/memcmp-avx2-movbe-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/memcmp-evex-movbe.S > create mode 100644 sysdeps/x86_64/multiarch/memmove-avx-unaligned-erms-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/memmove-evex-unaligned-erms.S > create mode 100644 sysdeps/x86_64/multiarch/memrchr-avx2-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/memrchr-evex.S > create mode 100644 sysdeps/x86_64/multiarch/memset-avx2-unaligned-erms-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/memset-evex-unaligned-erms.S > create mode 100644 sysdeps/x86_64/multiarch/rawmemchr-avx2-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/rawmemchr-evex.S > create mode 100644 sysdeps/x86_64/multiarch/stpcpy-avx2-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/stpcpy-evex.S > create mode 100644 sysdeps/x86_64/multiarch/stpncpy-avx2-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/stpncpy-evex.S > create mode 100644 sysdeps/x86_64/multiarch/strcat-avx2-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/strcat-evex.S > create mode 100644 sysdeps/x86_64/multiarch/strchr-avx2-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/strchr-evex.S > create mode 100644 sysdeps/x86_64/multiarch/strchrnul-avx2-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/strchrnul-evex.S > create mode 100644 sysdeps/x86_64/multiarch/strcmp-avx2-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/strcmp-evex.S > create mode 100644 sysdeps/x86_64/multiarch/strcpy-avx2-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/strcpy-evex.S > create mode 100644 sysdeps/x86_64/multiarch/strlen-avx2-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/strlen-evex.S > create mode 100644 sysdeps/x86_64/multiarch/strncat-avx2-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/strncat-evex.S > create mode 100644 sysdeps/x86_64/multiarch/strncmp-avx2-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/strncmp-evex.S > create mode 100644 sysdeps/x86_64/multiarch/strncpy-avx2-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/strncpy-evex.S > create mode 100644 sysdeps/x86_64/multiarch/strnlen-avx2-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/strnlen-evex.S > create mode 100644 sysdeps/x86_64/multiarch/strrchr-avx2-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/strrchr-evex.S > create mode 100644 sysdeps/x86_64/multiarch/wcschr-avx2-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/wcschr-evex.S > create mode 100644 sysdeps/x86_64/multiarch/wcscmp-avx2-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/wcscmp-evex.S > create mode 100644 sysdeps/x86_64/multiarch/wcslen-avx2-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/wcslen-evex.S > create mode 100644 sysdeps/x86_64/multiarch/wcsncmp-avx2-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/wcsncmp-evex.S > create mode 100644 sysdeps/x86_64/multiarch/wcsnlen-avx2-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/wcsnlen-evex.S > create mode 100644 sysdeps/x86_64/multiarch/wcsrchr-avx2-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/wcsrchr-evex.S > create mode 100644 sysdeps/x86_64/multiarch/wmemchr-avx2-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/wmemchr-evex.S > create mode 100644 sysdeps/x86_64/multiarch/wmemcmp-avx2-movbe-rtm.S > create mode 100644 sysdeps/x86_64/multiarch/wmemcmp-evex-movbe.S > > -- > 2.30.2 > These patches have been tested internally and externally for more than 2 weeks. I have been running the patched system glibc on AVX and AVX512 machines. If there are no objections nor comments, I will check them in next Tuesday. -- H.J.