[{"id":3678625,"web_url":"http://patchwork.ozlabs.org/comment/3678625/","msgid":"","list_archive_url":null,"date":"2026-04-17T09:56:34","subject":"Re: [PATCH] arm, bitint: Add support for FP_HANDLE_EXCEPTIONS and\n FP_ROUNDMODE with hard float abi","submitter":{"id":671,"url":"http://patchwork.ozlabs.org/api/people/671/","name":"Jakub Jelinek","email":"jakub@redhat.com"},"content":"On Fri, Apr 17, 2026 at 10:46:51AM +0100, Andre Vieira wrote:\n> This patch adds support for FP_HANDLE_EXCEPTIONS when using hard float abi.\n> This is used by _BitInt software emulation used for floating point\n> conversions to throw an exception.\n> This patch also adds support for FP_ROUNDMODE with hard float abit, which is\n> also used by _BitInt floating point emulation.\n> \n> FP_ROUNDMODE remains broken for soft-float ABI, but that's not _BitInt\n> specific.\n> \n> libgcc/ChangeLog:\n> \n>         * config/arm/sfp-exceptions.c: New file.\n>         * config/arm/sfp-machine.h: Define FP_HANDLE_EXCEPTIONS, FP_EX_*\n>         MACROs, _FP_DECL_EX, FP_ROUNDMODE, FP_INIT_ROUNDMODE, FP_RND_*\n> MACROs\n>         and declare __sfp_handle_exceptions.\n>         * config/arm/t-softfp: Add sfp-exceptions.c to LIB2ADD.\n\n> diff --git a/libgcc/config/arm/sfp-exceptions.c b/libgcc/config/arm/sfp-exceptions.c\n> new file mode 100644\n> index 0000000000000000000000000000000000000000..c066b49250b4ed908da0de96f1d7e37d5c915a91\n> --- /dev/null\n> +++ b/libgcc/config/arm/sfp-exceptions.c\n> @@ -0,0 +1,53 @@\n> +\n> +#if __ARM_FP\n> +#include \"sfp-machine.h\"\n> +\n> +/*\n> + _BitInt support for the arm port will use software emulation for conversions\n\nWhy /* on one line and the first line of the comment on another one?\n/* _BitInt support for the arm port will use software emulation for conversions\nwould look better.\n\n> + if ((_fex & FP_EX_INVALID) || (_fex & FP_EX_DIVZERO))\n> + fp_zero = fp_zero/fp_zero;\n\nfp_zero / fp_zero\n?\n\n> + if (_fex & FP_EX_OVERFLOW)\n> + fp_1e32 += fp_max;\n> + if (_fex & FP_EX_UNDERFLOW)\n> + fp_min *= fp_min;\n> + if (_fex & FP_EX_INEXACT)\n> + fp_max -= fp_one;\n> +}\n> +#endif\n\nOtherwise LGTM, but this is all arm specific, so I'll defer to ARM\nmaintainers.\n\n\tJakub","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=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=immw41zr;\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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charset=iso-8859-1","Content-Disposition":"inline","Content-Transfer-Encoding":"8bit","X-BeenThere":"gcc-patches@gcc.gnu.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Gcc-patches mailing list ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Reply-To":"Jakub Jelinek ","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"}},{"id":3678630,"web_url":"http://patchwork.ozlabs.org/comment/3678630/","msgid":"<3f5c9c0a-6a5c-4727-88a6-e114a4060f7e@arm.com>","list_archive_url":null,"date":"2026-04-17T10:00:43","subject":"Re: [PATCH] arm, bitint: Add support for FP_HANDLE_EXCEPTIONS and\n FP_ROUNDMODE with hard float abi","submitter":{"id":67887,"url":"http://patchwork.ozlabs.org/api/people/67887/","name":"Richard Earnshaw","email":"Richard.Earnshaw@arm.com"},"content":"On 17/04/2026 10:56, Jakub Jelinek wrote:\n> On Fri, Apr 17, 2026 at 10:46:51AM +0100, Andre Vieira wrote:\n>> This patch adds support for FP_HANDLE_EXCEPTIONS when using hard float abi.\n>> This is used by _BitInt software emulation used for floating point\n>> conversions to throw an exception.\n>> This patch also adds support for FP_ROUNDMODE with hard float abit, which is\n>> also used by _BitInt floating point emulation.\n>>\n>> FP_ROUNDMODE remains broken for soft-float ABI, but that's not _BitInt\n>> specific.\n>>\n>> libgcc/ChangeLog:\n>>\n>>         * config/arm/sfp-exceptions.c: New file.\n>>         * config/arm/sfp-machine.h: Define FP_HANDLE_EXCEPTIONS, FP_EX_*\n>>         MACROs, _FP_DECL_EX, FP_ROUNDMODE, FP_INIT_ROUNDMODE, FP_RND_*\n>> MACROs\n>>         and declare __sfp_handle_exceptions.\n>>         * config/arm/t-softfp: Add sfp-exceptions.c to LIB2ADD.\n> \n>> diff --git a/libgcc/config/arm/sfp-exceptions.c b/libgcc/config/arm/sfp-exceptions.c\n>> new file mode 100644\n>> index 0000000000000000000000000000000000000000..c066b49250b4ed908da0de96f1d7e37d5c915a91\n>> --- /dev/null\n>> +++ b/libgcc/config/arm/sfp-exceptions.c\n>> @@ -0,0 +1,53 @@\n>> +\n>> +#if __ARM_FP\n>> +#include \"sfp-machine.h\"\n>> +\n>> +/*\n>> + _BitInt support for the arm port will use software emulation for conversions\n> \n> Why /* on one line and the first line of the comment on another one?\n> /* _BitInt support for the arm port will use software emulation for conversions\n> would look better.\n> \n>> + if ((_fex & FP_EX_INVALID) || (_fex & FP_EX_DIVZERO))\n>> + fp_zero = fp_zero/fp_zero;\n> \n> fp_zero / fp_zero\n> ?\n> \n>> + if (_fex & FP_EX_OVERFLOW)\n>> + fp_1e32 += fp_max;\n>> + if (_fex & FP_EX_UNDERFLOW)\n>> + fp_min *= fp_min;\n>> + if (_fex & FP_EX_INEXACT)\n>> + fp_max -= fp_one;\n>> +}\n>> +#endif\n> \n> Otherwise LGTM, but this is all arm specific, so I'll defer to ARM\n> maintainers.\n> \n> \tJakub\n> \n\n\nI was just looking at it :)\n\nOK with the nits above cleaned up.\n\nR.","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=fail reason=\"signature verification failed\" (1024-bit key;\n unprotected) header.d=arm.com header.i=@arm.com header.a=rsa-sha256\n header.s=foss header.b=ijGQ1g0a;\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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charset=UTF-8","Content-Transfer-Encoding":"8bit","X-BeenThere":"gcc-patches@gcc.gnu.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Gcc-patches mailing list ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"}},{"id":3678821,"web_url":"http://patchwork.ozlabs.org/comment/3678821/","msgid":"","list_archive_url":null,"date":"2026-04-17T16:00:31","subject":"Re: [PATCH] arm, bitint: Add support for FP_HANDLE_EXCEPTIONS and\n FP_ROUNDMODE with hard float abi","submitter":{"id":67887,"url":"http://patchwork.ozlabs.org/api/people/67887/","name":"Richard Earnshaw","email":"Richard.Earnshaw@arm.com"},"content":"On 17/04/2026 11:00, Richard Earnshaw (foss) wrote:\n> On 17/04/2026 10:56, Jakub Jelinek wrote:\n>> On Fri, Apr 17, 2026 at 10:46:51AM +0100, Andre Vieira wrote:\n>>> This patch adds support for FP_HANDLE_EXCEPTIONS when using hard float abi.\n>>> This is used by _BitInt software emulation used for floating point\n>>> conversions to throw an exception.\n>>> This patch also adds support for FP_ROUNDMODE with hard float abit, which is\n>>> also used by _BitInt floating point emulation.\n>>>\n>>> FP_ROUNDMODE remains broken for soft-float ABI, but that's not _BitInt\n>>> specific.\n>>>\n>>> libgcc/ChangeLog:\n>>>\n>>>         * config/arm/sfp-exceptions.c: New file.\n>>>         * config/arm/sfp-machine.h: Define FP_HANDLE_EXCEPTIONS, FP_EX_*\n>>>         MACROs, _FP_DECL_EX, FP_ROUNDMODE, FP_INIT_ROUNDMODE, FP_RND_*\n>>> MACROs\n>>>         and declare __sfp_handle_exceptions.\n>>>         * config/arm/t-softfp: Add sfp-exceptions.c to LIB2ADD.\n>>\n>>> diff --git a/libgcc/config/arm/sfp-exceptions.c b/libgcc/config/arm/sfp-exceptions.c\n>>> new file mode 100644\n>>> index 0000000000000000000000000000000000000000..c066b49250b4ed908da0de96f1d7e37d5c915a91\n>>> --- /dev/null\n>>> +++ b/libgcc/config/arm/sfp-exceptions.c\n>>> @@ -0,0 +1,53 @@\n>>> +\n>>> +#if __ARM_FP\n>>> +#include \"sfp-machine.h\"\n>>> +\n>>> +/*\n>>> + _BitInt support for the arm port will use software emulation for conversions\n>>\n>> Why /* on one line and the first line of the comment on another one?\n>> /* _BitInt support for the arm port will use software emulation for conversions\n>> would look better.\n>>\n>>> + if ((_fex & FP_EX_INVALID) || (_fex & FP_EX_DIVZERO))\n>>> + fp_zero = fp_zero/fp_zero;\n>>\n>> fp_zero / fp_zero\n>> ?\n\nI've just realized this isn't quite correct. For FP_EX_DIVZERO you need a finite, non-zero dividend. eg: \n fp_one / fp_zero.\n\nR.\n\n>>\n>>> + if (_fex & FP_EX_OVERFLOW)\n>>> + fp_1e32 += fp_max;\n>>> + if (_fex & FP_EX_UNDERFLOW)\n>>> + fp_min *= fp_min;\n>>> + if (_fex & FP_EX_INEXACT)\n>>> + fp_max -= fp_one;\n>>> +}\n>>> +#endif\n>>\n>> Otherwise LGTM, but this is all arm specific, so I'll defer to ARM\n>> maintainers.\n>>\n>> \tJakub\n>>\n> \n> \n> I was just looking at it :)\n> \n> OK with the nits above cleaned up.\n> \n> R.","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=XJqmATAL;\n\tdkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com\n header.a=rsa-sha256 header.s=selector1 header.b=XJqmATAL;\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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