[{"id":3671177,"web_url":"http://patchwork.ozlabs.org/comment/3671177/","msgid":"","list_archive_url":null,"date":"2026-03-30T15:15:57","subject":"Re: [PATCH] aarch64: fix aarch64_core_data name offset [PR124629]","submitter":{"id":90594,"url":"http://patchwork.ozlabs.org/api/people/90594/","name":"Alice Carlotti","email":"alice.carlotti@arm.com"},"content":"On Wed, Mar 25, 2026 at 12:06:22PM +0800, Cutie Deng wrote:\n> aarch64: fix aarch64_core_data name offset\n> \n> \t* gcc/config/aarch64/driver-aarch64.cc (aarch64_core_data): Align name\n> \toffset in aarch64_core_data with driver info.\n> \n> This patch fixes an incorrect architecture name reported on AArch64.\n> The issue can be observed when running:\n> \n> gcc -c -Q --help=target -march=native\n> \n> where the printed architecture name does not match the driver table.\n> \n> The root cause is a wrong string offset used in aarch64_core_data.\n> Adjusting the offset makes the architecture name consistent with\n> the driver information.\n> \n> This change only affects the architecture name string generation\n> and does not impact code generation or ABI.\n\nThis analysis is incorrect - see my comment on bugzilla for details.\n\n> \n> Tested on aarch64-linux-gnu by building GCC and manually verifying\n> the output of -Q --help=target.\n> \n> Signed-off-by: Cutie Deng \n> \n> gcc/ChangeLog:\n> \n> \t* config/aarch64/driver-aarch64.cc (DEFAULT_CPU): Align name offset\n> in aarch64_core_data with driver info.\n> ---\n> gcc/config/aarch64/driver-aarch64.cc | 4 +++-\n> 1 file changed, 3 insertions(+), 1 deletion(-)\n> \n> diff --git a/gcc/config/aarch64/driver-aarch64.cc b/gcc/config/aarch64/driver-aarch64.cc\n> index a8888640e21..dca70f5cdfc 100644\n> --- a/gcc/config/aarch64/driver-aarch64.cc\n> +++ b/gcc/config/aarch64/driver-aarch64.cc\n> @@ -62,8 +62,10 @@ struct aarch64_core_data\n> #define DEFAULT_ARCH \"8A\"\n> #define DEFAULT_CPU \"generic-armv8-a\"\n> \n> +/* CORE_IDENT: Skip the leading \"V\" in the architecture name. */\n> #define AARCH64_CORE(CORE_NAME, CORE_IDENT, SCHED, ARCH, FLAGS, COSTS, IMP, PART, VARIANT) \\\n> - { CORE_NAME, #ARCH, IMP, PART, unsigned(VARIANT), feature_deps::cpu_##CORE_IDENT },\n> + { CORE_NAME, #ARCH + 1, IMP, PART, unsigned (VARIANT),\n> + feature_deps::cpu_##CORE_IDENT },\n\nThis string, and the corresponding architecture one, are only ever compared\nagainst each other, so it would be better to retain the 'V' in both, rather\nthan removing it with the \"+ 1\" (which makes the code harder to understand). \n\nBetter still would be to avoid using string comparisons altogether, which would\nbe a little more work, although perhaps we can use the aarch64_feature::ARCH\nenum values here.\n\nThanks,\nAlice\n\n> \n> static CONSTEXPR const aarch64_core_data aarch64_cpu_data[] =\n> {\n> -- \n> 2.50.1 (Apple Git-155)\n>","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=arm.com header.i=@arm.com header.a=rsa-sha256\n header.s=selector1 header.b=bxhfa61J;\n\tdkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com\n header.a=rsa-sha256 header.s=selector1 header.b=bxhfa61J;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; 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