[{"id":1771840,"web_url":"http://patchwork.ozlabs.org/comment/1771840/","msgid":"<59C26B81.70200@arm.com>","list_archive_url":null,"date":"2017-09-20T13:22:09","subject":"Re: [PATCH 1/9 v3] Optimized generic expf and exp2f with wrappers","submitter":{"id":65667,"url":"http://patchwork.ozlabs.org/api/people/65667/","name":"Szabolcs Nagy","email":"szabolcs.nagy@arm.com"},"content":"On 19/09/17 13:52, Szabolcs Nagy wrote:\n> Based on new expf and exp2f code from\n> https://github.com/ARM-software/optimized-routines/\n> \n> with the new expf benchmark (with wrapper, aarch64):\n> reciprocal-throughput: 2.3x faster\n> latency: 1.7x faster\n> with the new expf benchmark (without wrapper, aarch64):\n> reciprocal-throughput: 3.3x faster\n> latency: 1.7x faster\n> with naive ubenchmark (without wrapper, aarch64):\n> reciprocal-throughput: 3.7x faster\n> latency: 1.3x faster\n\nwith the committed exp2f benchmark it's\n\nreciprocal-throughput: 2.8x faster\nlatency: 1.3x faster\n\n> libm.so size on aarch64:\n> .text size: -152 bytes\n> .rodata size: -1740 bytes\n> expf/exp2f worst case nearest rounding error: 0.502 ulp\n> worst case non-nearest rounding error: 1 ulp\n> \n> Error checks are inline and errno setting is in separate\n> tail called functions, but the wrappers are kept in this\n> patch to handle the _LIB_VERSION==_SVID_ case. (So e.g.\n> errno is set twice for expf calls and once __expf_finite\n> calls now on targets where the new code is used.)\n> \n> Double precision arithmetics is used which is expected\n> to be faster on most targets (including soft-float) than\n> using single precision and it is easier to get good\n> precision result with it.\n> \n> Const data is kept in a separate translation unit which\n> complicates maintenance a bit, but is expected to give\n> good code for literal loads on most targets and allows\n> sharing data across expf, exp2f and powf. (This data is\n> disabled on i386 and ia64 which have their own expf, exp2f\n> and powf code.)\n> \n> Some configuration is in a new math_config.h the settings\n> may need further discussion.\n> \n> Some details may need target specific tweaks:\n> - best convert and round to int operation in the arg\n> reduction may be different across targets.\n> - code was optimized on fma target, optimal polynomial\n> eval may be different without fma.\n> - gcc does not always generate good code for fp bit\n> representation access via unions or it may be inherently\n> slow on some target.\n> \n> The libm-test-ulps will need adjustment because..\n> - The argument reduction ideally uses nearest rounded rint,\n> but that is not efficient on most targets, so the polynomial\n> can get evaluated on a wider interval in non-nearest\n> rounding mode making 1 ulp errors common in that case.\n> - The polynomial is evaluated such that it has 1 ulp error\n> on negative tiny inputs with upward rounding, but in\n> exchange the evaluation is better pipelined.\n> \n> v3:\n> - Add sysdeps/m68k/m680x0/fpu/{math_errf/e_exp2f_data}.c\n> \n> 2017-09-19 Szabolcs Nagy \n> \n> \t* math/Makefile (type-float-routines): Add math_errf and e_exp2f_data.\n> \t* sysdeps/aarch64/fpu/math_private.h (TOINT_INTRINSICS): Define.\n> \t(roundtoint, converttoint): Likewise.\n> \t* sysdeps/ieee754/flt-32/e_expf.c: New implementation.\n> \t* sysdeps/ieee754/flt-32/e_exp2f.c: New implementation.\n> \t* sysdeps/ieee754/flt-32/e_exp2f_data.c: New file.\n> \t* sysdeps/ieee754/flt-32/math_config.h: New file.\n> \t* sysdeps/ieee754/flt-32/math_errf.c: New file.\n> \t* sysdeps/ieee754/flt-32/t_exp2f.h: Remove.\n> \t* sysdeps/i386/fpu/e_exp2f_data.c: New file.\n> \t* sysdeps/i386/fpu/math_errf.c: New file.\n> \t* sysdeps/ia64/fpu/e_exp2f_data.c: New file.\n> \t* sysdeps/ia64/fpu/math_errf.c: New file.\n> \t* sysdeps/m68k/m680x0/fpu/e_exp2f_data.c: New file.\n> \t* sysdeps/m68k/m680x0/fpu/math_errf.c: New file.\n> \n>","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":["patchwork-incoming@bilbo.ozlabs.org","mailing list libc-alpha@sourceware.org"],"Authentication-Results":["ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=sourceware.org\n\t(client-ip=209.132.180.131; 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Linux x86_64;\n\trv:31.0) Gecko/20100101 Thunderbird/31.8.0","MIME-Version":"1.0","To":"GNU C Library ","CC":"nd@arm.com","Subject":"Re: [PATCH 1/9 v3] Optimized generic expf and exp2f with wrappers","References":"<59C1123F.9080003@arm.com> <59C11310.5000004@arm.com>","In-Reply-To":"<59C11310.5000004@arm.com>","Content-Type":"text/plain; charset=utf-8","Content-Transfer-Encoding":"7bit","X-ClientProxiedBy":"AM5PR0102CA0006.eurprd01.prod.exchangelabs.com\n\t(2603:10a6:206::19) To DB6PR0802MB2487.eurprd08.prod.outlook.com\n\t(2603:10a6:4:a0::22)","X-MS-PublicTrafficType":"Email","X-MS-Office365-Filtering-Correlation-Id":"0fdaddbd-79e6-4989-c0ad-08d5002a9a4c","X-MS-Office365-Filtering-HT":"Tenant","X-Microsoft-Antispam":"UriScan:; BCL:0; PCL:0;\n\tRULEID:(300000500095)(300135000095)(300000501095)(300135300095)(22001)(300000502095)(300135100095)(2017030254152)(48565401081)(300000503095)(300135400095)(2017052603199)(201703131423075)(201703031133081)(201702281549075)(300000504095)(300135200095)(300000505095)(300135600095)(300000506095)(300135500095);\n\tSRVR:DB6PR0802MB2487; 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SFP:1101; SCL:1; SRVR:DB6PR0802MB2487;\n\tH:[10.2.206.69]; FPR:; SPF:None; PTR:InfoNoRecords; A:1; MX:3;\n\tLANG:en; ","Received-SPF":"None (protection.outlook.com: arm.com does not designate\n\tpermitted sender hosts)","SpamDiagnosticOutput":"1:99","SpamDiagnosticMetadata":"NSPM","X-OriginatorOrg":"arm.com","X-MS-Exchange-CrossTenant-OriginalArrivalTime":"20 Sep 2017 13:22:11.7328\n\t(UTC)","X-MS-Exchange-CrossTenant-FromEntityHeader":"Hosted","X-MS-Exchange-CrossTenant-Id":"f34e5979-57d9-4aaa-ad4d-b122a662184d","X-MS-Exchange-Transport-CrossTenantHeadersStamped":"DB6PR0802MB2487"}},{"id":1773197,"web_url":"http://patchwork.ozlabs.org/comment/1773197/","msgid":"","list_archive_url":null,"date":"2017-09-21T23:44:13","subject":"Re: [PATCH 1/9 v3] Optimized generic expf and exp2f with wrappers","submitter":{"id":4349,"url":"http://patchwork.ozlabs.org/api/people/4349/","name":"Joseph Myers","email":"joseph@codesourcery.com"},"content":"On Tue, 19 Sep 2017, Szabolcs Nagy wrote:\n\n> diff --git a/sysdeps/aarch64/fpu/math_private.h b/sysdeps/aarch64/fpu/math_private.h\n> index 807111ea5a..775237ffb2 100644\n> --- a/sysdeps/aarch64/fpu/math_private.h\n> +++ b/sysdeps/aarch64/fpu/math_private.h\n> @@ -319,6 +319,26 @@ libc_feresetround_noex_aarch64_ctx (struct rm_ctx *ctx)\n> #define libc_feresetround_noexf_ctx\tlibc_feresetround_noex_aarch64_ctx\n> #define libc_feresetround_noexl_ctx\tlibc_feresetround_noex_aarch64_ctx\n> \n> +/* Hack: only include the large arm_neon.h when needed. */\n> +#ifdef _MATH_CONFIG_H\n> +#include \n> +\n> +/* ACLE intrinsics for frintn and fcvtns instructions. */\n> +#define TOINT_INTRINSICS 1\n\nI'd expect preprocessor indentation here, \"# include\" and \"# define\", \ninside #ifdef (I think it's only the toplevel multiple-include conditional \naround a whole file that doesn't get such indentation used).\n\n> + /* x = k/N + r with r in [-1/(2N), 1/(2N)] and int k. */\n> + kd = (double) (xd + SHIFT); /* Rounding to double precision is required. */\n\nRemark (not an issue while this code isn't used for 32-bit x86): a cast \nmay not achieve that rounding with the default -fexcess-precision=fast so \nusing this code for 32-bit x86 might require math_narrow_eval here.\n\n> +extern const struct exp2f_data\n> +{\n> + uint64_t tab[1 << EXP2F_TABLE_BITS];\n> + double shift_scaled;\n> + double poly[EXP2F_POLY_ORDER];\n> + double shift;\n> + double invln2_scaled;\n> + double poly_scaled[EXP2F_POLY_ORDER];\n> +} __exp2f_data;\n\nThis ought to be attribute_hidden as well.\n\nOK with the preprocessor indentation and attribute_hidden fixes.","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":["patchwork-incoming@bilbo.ozlabs.org","mailing list libc-alpha@sourceware.org"],"Authentication-Results":["ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=sourceware.org\n\t(client-ip=209.132.180.131; helo=sourceware.org;\n\tenvelope-from=libc-alpha-return-84840-incoming=patchwork.ozlabs.org@sourceware.org;\n\treceiver=)","ozlabs.org; dkim=pass (1024-bit key;\n\tsecure) header.d=sourceware.org header.i=@sourceware.org\n\theader.b=\"eXSGCdBo\"; dkim-atps=neutral","sourceware.org; auth=none"],"Received":["from sourceware.org (server1.sourceware.org [209.132.180.131])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256\n\tbits)) (No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xytdD6mgPz9t67\n\tfor ;\n\tFri, 22 Sep 2017 09:49:10 +1000 (AEST)","(qmail 31650 invoked by alias); 21 Sep 2017 23:44:26 -0000","(qmail 31637 invoked by uid 89); 21 Sep 2017 23:44:25 -0000"],"DomainKey-Signature":"a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id\n\t:list-unsubscribe:list-subscribe:list-archive:list-post\n\t:list-help:sender:date:from:to:cc:subject:in-reply-to:message-id\n\t:references:mime-version:content-type; q=dns; s=default; b=shNJq\n\tqETSrmymFI5LsifPS3dkQYX3SxepsRGqoKdFlGFzOpCu0+JD0YKo/Pvkn0ZSR+Gj\n\tRNfoH6P+mD3dYcE2BKKH0WOGsU3jBWuXMeh7RcRa6uTojuUMOpd1+0tgogbsHxGf\n\t0aWfXEr48Tw7bB4f/gj8bLPVWeX3m2KNYYVViY=","DKIM-Signature":"v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id\n\t:list-unsubscribe:list-subscribe:list-archive:list-post\n\t:list-help:sender:date:from:to:cc:subject:in-reply-to:message-id\n\t:references:mime-version:content-type; s=default; bh=yp0oXsoZeF2\n\tc4vTFFY9yTruBqQE=; b=eXSGCdBofQ47sDh9llYTCcP6/2xI+80pr9dZFHomodT\n\tMqVPXcDHQBNpoFxH07tiQ4gWx4kwNrPjidT+KSASpzekkqO/rqsBHFBv61PBdmqe\n\ttxRNOYcFf/Vb0hloahtSMzMXwmFxkCWeXvLLZcoOlbvU5K1guB7XJCiePQ1fL4GM\n\t=","Mailing-List":"contact libc-alpha-help@sourceware.org; run by ezmlm","Precedence":"bulk","List-Id":"","List-Unsubscribe":"","List-Subscribe":"","List-Archive":"","List-Post":"","List-Help":",\n\t","Sender":"libc-alpha-owner@sourceware.org","X-Virus-Found":"No","X-Spam-SWARE-Status":"No, score=-24.5 required=5.0 tests=AWL, BAYES_00,\n\tGIT_PATCH_0, GIT_PATCH_1, GIT_PATCH_2, GIT_PATCH_3,\n\tRCVD_IN_DNSWL_NONE, SPF_PASS,\n\tURIBL_RED autolearn=ham version=3.3.2 spammy=poly, Hack","X-HELO":"relay1.mentorg.com","Date":"Thu, 21 Sep 2017 23:44:13 +0000","From":"Joseph Myers ","To":"Szabolcs Nagy ","CC":"GNU C Library , ","Subject":"Re: [PATCH 1/9 v3] Optimized generic expf and exp2f with wrappers","In-Reply-To":"<59C11310.5000004@arm.com>","Message-ID":"","References":"<59C1123F.9080003@arm.com> <59C11310.5000004@arm.com>","User-Agent":"Alpine 2.20 (DEB 67 2015-01-07)","MIME-Version":"1.0","Content-Type":"text/plain; charset=\"US-ASCII\"","X-ClientProxiedBy":"svr-ies-mbx-01.mgc.mentorg.com (139.181.222.1) To\n\tsvr-ies-mbx-01.mgc.mentorg.com (139.181.222.1)"}},{"id":1773200,"web_url":"http://patchwork.ozlabs.org/comment/1773200/","msgid":"","list_archive_url":null,"date":"2017-09-21T23:50:25","subject":"Re: [PATCH 1/9 v3] Optimized generic expf and exp2f with wrappers","submitter":{"id":4349,"url":"http://patchwork.ozlabs.org/api/people/4349/","name":"Joseph Myers","email":"joseph@codesourcery.com"},"content":"Note that I'd expect each addition of an optimized function to add / \nupdate a NEWS entry.","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":["patchwork-incoming@bilbo.ozlabs.org","mailing list libc-alpha@sourceware.org"],"Authentication-Results":["ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=sourceware.org\n\t(client-ip=209.132.180.131; helo=sourceware.org;\n\tenvelope-from=libc-alpha-return-84842-incoming=patchwork.ozlabs.org@sourceware.org;\n\treceiver=)","ozlabs.org; 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charset=\"US-ASCII\"","X-ClientProxiedBy":"svr-ies-mbx-01.mgc.mentorg.com (139.181.222.1) To\n\tsvr-ies-mbx-01.mgc.mentorg.com (139.181.222.1)"}},{"id":1773739,"web_url":"http://patchwork.ozlabs.org/comment/1773739/","msgid":"<59C539AA.2070008@arm.com>","list_archive_url":null,"date":"2017-09-22T16:26:18","subject":"Re: [PATCH 1/9 v3] Optimized generic expf and exp2f with wrappers","submitter":{"id":65667,"url":"http://patchwork.ozlabs.org/api/people/65667/","name":"Szabolcs Nagy","email":"szabolcs.nagy@arm.com"},"content":"On 22/09/17 00:44, Joseph Myers wrote:\n> On Tue, 19 Sep 2017, Szabolcs Nagy wrote:\n>> + /* x = k/N + r with r in [-1/(2N), 1/(2N)] and int k. */\n>> + kd = (double) (xd + SHIFT); /* Rounding to double precision is required. */\n> \n> Remark (not an issue while this code isn't used for 32-bit x86): a cast \n> may not achieve that rounding with the default -fexcess-precision=fast so \n> using this code for 32-bit x86 might require math_narrow_eval here.\n> \n\nit seems the generated code for i686 happens to be correct\nwith gcc-7, but i will add math_narrow_eval if that is\nneeded for guaranteed rounding here (in case it later gets\nenabled for i686).","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":["patchwork-incoming@bilbo.ozlabs.org","mailing list libc-alpha@sourceware.org"],"Authentication-Results":["ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=sourceware.org\n\t(client-ip=209.132.180.131; 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Linux x86_64;\n\trv:31.0) Gecko/20100101 Thunderbird/31.8.0","MIME-Version":"1.0","To":"Joseph Myers ","CC":"nd@arm.com, GNU C Library ","Subject":"Re: [PATCH 1/9 v3] Optimized generic expf and exp2f with wrappers","References":"<59C1123F.9080003@arm.com> <59C11310.5000004@arm.com>\n\t","In-Reply-To":"","Content-Type":"text/plain; charset=windows-1252","Content-Transfer-Encoding":"7bit","X-ClientProxiedBy":"AM4PR0202CA0010.eurprd02.prod.outlook.com\n\t(2603:10a6:200:89::20) To DB6PR0802MB2487.eurprd08.prod.outlook.com\n\t(2603:10a6:4:a0::22)","X-MS-PublicTrafficType":"Email","X-MS-Office365-Filtering-Correlation-Id":"7251cf50-bf53-4ec6-0bef-08d501d6a95d","X-MS-Office365-Filtering-HT":"Tenant","X-Microsoft-Antispam":"UriScan:; BCL:0; PCL:0;\n\tRULEID:(300000500095)(300135000095)(300000501095)(300135300095)(22001)(300000502095)(300135100095)(2017030254152)(48565401081)(300000503095)(300135400095)(2017052603199)(201703131423075)(201703031133081)(201702281549075)(300000504095)(300135200095)(300000505095)(300135600095)(300000506095)(300135500095);\n\tSRVR:DB6PR0802MB2487; 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/* Rounding to double precision is required. */\n> > \n> > Remark (not an issue while this code isn't used for 32-bit x86): a cast \n> > may not achieve that rounding with the default -fexcess-precision=fast so \n> > using this code for 32-bit x86 might require math_narrow_eval here.\n> \n> it seems the generated code for i686 happens to be correct\n> with gcc-7, but i will add math_narrow_eval if that is\n> needed for guaranteed rounding here (in case it later gets\n> enabled for i686).\n\nNote that code like this appears in both expf and exp2f, though I only \nmentioned it once in my review.","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":["patchwork-incoming@bilbo.ozlabs.org","mailing list libc-alpha@sourceware.org"],"Authentication-Results":["ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=sourceware.org\n\t(client-ip=209.132.180.131; helo=sourceware.org;\n\tenvelope-from=libc-alpha-return-84855-incoming=patchwork.ozlabs.org@sourceware.org;\n\treceiver=)","ozlabs.org; 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