[{"id":3669183,"web_url":"http://patchwork.ozlabs.org/comment/3669183/","msgid":"","list_archive_url":null,"date":"2026-03-25T16:18:20","subject":"Re: [PATCH 1/1] libgcc: Add sdata8 binary search support to\n _Unwind_Find_FDE","submitter":{"id":37,"url":"http://patchwork.ozlabs.org/api/people/37/","name":"Andreas Schwab","email":"schwab@suse.de"},"content":"On Mär 25 2026, Farid Zakaria wrote:\n\n> @@ -437,23 +446,45 @@ find_fde_tail (_Unwind_Ptr pc,\n> /* Shouldn't happen. */\n> if (fde_count == 0)\n> \treturn NULL;\n> - if ((((_Unwind_Ptr) p) & 3) == 0)\n> + if ((((_Unwind_Ptr) p) & align_mask) == 0)\n> \t{\n> -\t struct fde_table {\n> -\t signed initial_loc __attribute__ ((mode (SI)));\n> -\t signed fde __attribute__ ((mode (SI)));\n> -\t };\n> -\t const struct fde_table *table = (const struct fde_table *) p;\n> +\t const unsigned char *table = p;\n> \t size_t lo, hi, mid;\n> \t _Unwind_Ptr data_base = (_Unwind_Ptr) hdr;\n> \t fde *f;\n> \t unsigned int f_enc, f_enc_size;\n> \t _Unwind_Ptr range;\n> \n> +\t /* Read a signed field from the table. For sdata4 entries\n> +\t these are mode (SI) (32-bit); for sdata8, mode (DI) (64-bit).\n> +\t Use the packed unaligned union from unwind-pe.h types. */\n> +\t union table_entry {\n> +\t signed s4 __attribute__ ((mode (SI)));\n> +\t signed s8 __attribute__ ((mode (DI)));\n> +\t } __attribute__ ((__packed__));\n> +\n> +\t /* Read the initial_loc field at a given table index. */\n> +#define TABLE_LOC(i)\t\t\t\t\t\t\\\n> +\t (is_sdata8\t\t\t\t\t\t\\\n> +\t ? (_Unwind_Ptr) ((const union table_entry *)\t\t\\\n> +\t\t\t (table + (i) * entry_size))->s8\t\\\n> +\t : (_Unwind_Ptr) ((const union table_entry *)\t\t\\\n> +\t\t\t (table + (i) * entry_size))->s4)\n> +\n> +\t /* Read the fde field at a given table index. */\n> +#define TABLE_FDE(i)\t\t\t\t\t\t\\\n> +\t (is_sdata8\t\t\t\t\t\t\\\n> +\t ? (_Unwind_Ptr) ((const union table_entry *)\t\t\\\n> +\t\t\t (table + (i) * entry_size\t\t\\\n> +\t\t\t + field_size))->s8\t\t\t\\\n> +\t : (_Unwind_Ptr) ((const union table_entry *)\t\t\\\n> +\t\t\t (table + (i) * entry_size\t\t\\\n> +\t\t\t + field_size))->s4)\n\nWhy does that need to use unaligned accesses when the table pointer is\nguaranteed to be aligned?","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=suse.de header.i=@suse.de header.a=rsa-sha256\n header.s=susede2_rsa header.b=Pfq99QGP;\n\tdkim=pass header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=ZHaqblbR;\n\tdkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de\n header.a=rsa-sha256 header.s=susede2_rsa header.b=dl/LVy9D;\n\tdkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=/29xA4g5;\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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a=ed25519-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_ed25519; t=1774455500;\n h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc:\n mime-version:mime-version:content-type:content-type:\n content-transfer-encoding:content-transfer-encoding:\n in-reply-to:in-reply-to:references:references;\n bh=J/PQjy0wwpKBKeq+PWwK+fP4waCu1mnD/HuYwLAmBAM=;\n b=/29xA4g5beuK9LDnUj+M6BchkqItoARFjsIy6pgSHq9ntgSnfYcw2t6mhULXx02Zql7lm/\n ojjxSHmwPiXTfgAQ=="],"From":"Andreas Schwab ","To":"Farid Zakaria ","Cc":"","Subject":"Re: [PATCH 1/1] libgcc: Add sdata8 binary search support to\n _Unwind_Find_FDE","In-Reply-To":"<20260325160125.3469231-2-fmzakari@meta.com> (Farid Zakaria's\n message of \"Wed, 25 Mar 2026 09:01:25 -0700\")","References":"<20260325160125.3469231-1-fmzakari@meta.com>\n <20260325160125.3469231-2-fmzakari@meta.com>","Date":"Wed, 25 Mar 2026 17:18:20 +0100","Message-ID":"","User-Agent":"Gnus/5.13 (Gnus v5.13)","MIME-Version":"1.0","Content-Type":"text/plain; charset=utf-8","Content-Transfer-Encoding":"8bit","X-Rspamd-Server":"rspamd2.dmz-prg2.suse.org","X-Spamd-Result":"default: False [15.29 / 50.00]; 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For sdata4 entries\n> > + these are mode (SI) (32-bit); for sdata8, mode (DI) (64-bit).\n> > + Use the packed unaligned union from unwind-pe.h types. */\n> > + union table_entry {\n> > + signed s4 __attribute__ ((mode (SI)));\n> > + signed s8 __attribute__ ((mode (DI)));\n> > + } __attribute__ ((__packed__));\n> > +\n> > + /* Read the initial_loc field at a given table index. */\n> > +#define TABLE_LOC(i) \\\n> > + (is_sdata8 \\\n> > + ? (_Unwind_Ptr) ((const union table_entry *) \\\n> > + (table + (i) * entry_size))->s8 \\\n> > + : (_Unwind_Ptr) ((const union table_entry *) \\\n> > + (table + (i) * entry_size))->s4)\n> > +\n> > + /* Read the fde field at a given table index. */\n> > +#define TABLE_FDE(i) \\\n> > + (is_sdata8 \\\n> > + ? (_Unwind_Ptr) ((const union table_entry *) \\\n> > + (table + (i) * entry_size \\\n> > + + field_size))->s8 \\\n> > + : (_Unwind_Ptr) ((const union table_entry *) \\\n> > + (table + (i) * entry_size \\\n> > + + field_size))->s4)\n>\n> Why does that need to use unaligned accesses when the table pointer is\n> guaranteed to be aligned?\n\nLooks like you are right.\nI can remove it.\n\nI don't often submit `send-mail` patches... (this is my 2nd?)\nShould I wait for a few more reviewers before updating the patch series?\n\n> --\n> Andreas Schwab, SUSE Labs, schwab@suse.de\n> GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7\n> \"And now for something completely different.\"","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 (2048-bit key;\n unprotected) header.d=meta.com header.i=@meta.com header.a=rsa-sha256\n header.s=s2048-2025-q2 header.b=ZjcvMkMf;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=38.145.34.32; helo=vm01.sourceware.org;\n envelope-from=gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org;\n receiver=patchwork.ozlabs.org)","sourceware.org;\n\tdkim=pass (2048-bit key,\n unprotected) header.d=meta.com header.i=@meta.com header.a=rsa-sha256\n header.s=s2048-2025-q2 header.b=ZjcvMkMf","sourceware.org;\n dmarc=pass (p=reject dis=none) header.from=meta.com","sourceware.org; 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