[{"id":3675275,"web_url":"http://patchwork.ozlabs.org/comment/3675275/","msgid":"","list_archive_url":null,"date":"2026-04-09T12:08:56","subject":"Re: [PATCH] - ICE verify_vssa exceeds stack space for big functions\n [PR124805]","submitter":{"id":1765,"url":"http://patchwork.ozlabs.org/api/people/1765/","name":"Richard Biener","email":"richard.guenther@gmail.com"},"content":"On Wed, Apr 8, 2026 at 11:32 PM Heiko Eißfeldt wrote:\n>\n> The source from PR124561 led to an ICE with --enable-checking, caused by a stack overflow.\n> The recursive verification code verify_vssa in tree-ssa.cc could not handle the extreme\n> number of basic blocks within the typical limits of stack space.\n>\n> As for PR124561 the recursive code was transformed into an iterative version, which\n> avoided the recursive calls.\n>\n> A worklist is used, which has as entries a pair of a basic_block and a tree (vdef).\n> The logic of verification steps for each basic_block is unchanged, although the order\n> of basic_blocks is changed.\n>\n> This fixes PR124805.\n>\n> Reg tested OK.\n\nThis is OK for stage1.\n\nThanks,\nRichard.\n\n> 2026-04-07 Heiko Eißfeldt \n>\n> PR middle-end/124805\n> * tree-ssa.cc (verify_vssa):\n> replace recursive calls with iteration for lower stack usage","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=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=OLKebWY0;\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; 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) 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","Cc":"gcc-patches@gcc.gnu.org","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable","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":3676823,"web_url":"http://patchwork.ozlabs.org/comment/3676823/","msgid":"","list_archive_url":null,"date":"2026-04-13T15:34:50","subject":"Re: [PATCH] - ICE verify_vssa exceeds stack space for big functions\n [PR124805]","submitter":{"id":93079,"url":"http://patchwork.ozlabs.org/api/people/93079/","name":"Heiko Eißfeldt","email":"heiko.Eissfeldt@hexco.de"},"content":"Thanks for your review!\n\nI just got a notification regarding three new regressions with my patch\n(https://patchwork.sourceware.org/patch/132826)\non aarch64-linux-gnu in\n\nlibstdc++:libstdc++-prettyprinters/prettyprinters.exp\n\nProduces 3 regressions:\n |\n | regressions.sum:\n | Running libstdc++:libstdc++-prettyprinters/prettyprinters.exp ...\n | FAIL: libstdc++-prettyprinters/debug.cc print redirected\n | FAIL: libstdc++-prettyprinters/simple.cc print redirected\n | FAIL: libstdc++-prettyprinters/simple11.cc print redirected\n\nNote: the arm 32 bit build was without any regressions.\n\nNow I need to understand what causes these regressions...\n\nAny hints to accelerate my understanding would be very much appreciated.\n\nAt first I would like to understand how verify_vssa() can be invoked without\n--enable-checking (which seems the configuration being used by Linaro CI).\n\nThen I fail to see any connection to libc++ prettyprinters tests\n(which also involve python and gdb).\n\nFinally there should follow a V2 patch.\n\nThanks,\nHeiko\n\nOn 4/9/26 2:08 PM, Richard Biener wrote:\n> On Wed, Apr 8, 2026 at 11:32 PM Heiko Eißfeldt wrote:\n>> The source from PR124561 led to an ICE with --enable-checking, caused by a stack overflow.\n>> The recursive verification code verify_vssa in tree-ssa.cc could not handle the extreme\n>> number of basic blocks within the typical limits of stack space.\n>>\n>> As for PR124561 the recursive code was transformed into an iterative version, which\n>> avoided the recursive calls.\n>>\n>> A worklist is used, which has as entries a pair of a basic_block and a tree (vdef).\n>> The logic of verification steps for each basic_block is unchanged, although the order\n>> of basic_blocks is changed.\n>>\n>> This fixes PR124805.\n>>\n>> Reg tested OK.\n> This is OK for stage1.\n>\n> Thanks,\n> Richard.\n>\n>> 2026-04-07 Heiko Eißfeldt\n>>\n>> PR middle-end/124805\n>> * tree-ssa.cc (verify_vssa):\n>> replace recursive calls with iteration for lower stack usage","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=hexco.de header.i=heiko.eissfeldt@hexco.de\n header.a=rsa-sha256 header.s=s1-ionos header.b=Lg9Hg1CR;\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; 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=hexco.de header.i=heiko.eissfeldt@hexco.de\n header.a=rsa-sha256 header.s=s1-ionos header.b=Lg9Hg1CR","sourceware.org;\n dmarc=pass (p=none dis=none) header.from=hexco.de","sourceware.org; spf=pass smtp.mailfrom=hexco.de","server2.sourceware.org;\n arc=none 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big functions\n [PR124805]","To":"Richard Biener ","Cc":"gcc-patches@gcc.gnu.org","References":"<2c4ed43b-9787-4c50-b0d9-ee213a3bb896@hexco.de>\n ","Content-Language":"en-US","From":"=?utf-8?q?Heiko_Ei=C3=9Ffeldt?= ","In-Reply-To":"\n ","X-Provags-ID":"V03:K1:Qg06Is1SZTD54SS6ECttcnNWSPRHzJDGkzgk1OF+Er1V9lPG7h/\n F5/EHhTlDCxCUzEn4Wb6QVZBuFkR/od7L0z//4rdgwZkorFrD71i19BSPzncM76SVi7mrD1\n mkbBwSGrIIe0BHGGfs2KDuzyzxUQzJRpQOlq+qpqKwS3Ho57dKv21FMgAS9RXGCVh7js2fu\n eA16Tme0lQEvyJrqzBhRg==","UI-OutboundReport":"notjunk:1;M01:P0:FwrfcuojaLw=;0x1TuCAvGg5hFmtLeKo+ounzTDO\n ZAWVWNGpbsvu8b0q5OC16k3IbGSPZ5Clt+DrkCsh7WWfSu36fCukt/LCVwRYplXLfSyPvULm9\n xYwIb4Bb9kAXXHOiTaNHfCGEmPyg9holHMmgwuM0MIAg70mDPzalARYMvHl7gkJaxHdLCvMOq\n tQUMXyMsG2IOZalcBuEtUiI7e230NiM1jAJeCEFYt7ZHeGiefJ5/k5l2JiVPQoKXCWtfk7Pbf\n zxzEuo6tj34UtRN7KWmb3xqzIN2H10DfmBzmI4uTWd8Bn6MSf7jUTIYu4bqeaQGL2f0GDijv4\n GE/wGb6pEr6wicc0HYGoqRGwEoSKC0znKQeFleBv12yBdiVOPTVX8iFXqEQ61irzuitnLwKeY\n 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","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"}},{"id":3677030,"web_url":"http://patchwork.ozlabs.org/comment/3677030/","msgid":"","list_archive_url":null,"date":"2026-04-14T06:05:35","subject":"Re: [PATCH] - ICE verify_vssa exceeds stack space for big functions\n [PR124805]","submitter":{"id":1765,"url":"http://patchwork.ozlabs.org/api/people/1765/","name":"Richard Biener","email":"richard.guenther@gmail.com"},"content":"On Mon, Apr 13, 2026 at 5:29 PM Heiko Eißfeldt wrote:\n>\n> Thanks for your review!\n>\n> I just got a notification regarding three new regressions with my patch\n> (https://patchwork.sourceware.org/patch/132826)\n> on aarch64-linux-gnu in\n>\n> libstdc++:libstdc++-prettyprinters/prettyprinters.exp\n>\n> Produces 3 regressions:\n> |\n> | regressions.sum:\n> | Running libstdc++:libstdc++-prettyprinters/prettyprinters.exp ...\n> | FAIL: libstdc++-prettyprinters/debug.cc print redirected\n> | FAIL: libstdc++-prettyprinters/simple.cc print redirected\n> | FAIL: libstdc++-prettyprinters/simple11.cc print redirected\n>\n> Note: the arm 32 bit build was without any regressions.\n\nI'm pretty sure those are not caused by your patch - you'd have to\nreach out to linaro folks to assess what goes wrong here.\n\n> Now I need to understand what causes these regressions...\n>\n> Any hints to accelerate my understanding would be very much appreciated.\n>\n> At first I would like to understand how verify_vssa() can be invoked without\n> --enable-checking (which seems the configuration being used by Linaro CI).\n>\n> Then I fail to see any connection to libc++ prettyprinters tests\n> (which also involve python and gdb).\n>\n> Finally there should follow a V2 patch.\n>\n> Thanks,\n> Heiko\n>\n> On 4/9/26 2:08 PM, Richard Biener wrote:\n>\n> On Wed, Apr 8, 2026 at 11:32 PM Heiko Eißfeldt wrote:\n>\n> The source from PR124561 led to an ICE with --enable-checking, caused by a stack overflow.\n> The recursive verification code verify_vssa in tree-ssa.cc could not handle the extreme\n> number of basic blocks within the typical limits of stack space.\n>\n> As for PR124561 the recursive code was transformed into an iterative version, which\n> avoided the recursive calls.\n>\n> A worklist is used, which has as entries a pair of a basic_block and a tree (vdef).\n> The logic of verification steps for each basic_block is unchanged, although the order\n> of basic_blocks is changed.\n>\n> This fixes PR124805.\n>\n> Reg tested OK.\n>\n> This is OK for stage1.\n>\n> Thanks,\n> Richard.\n>\n> 2026-04-07 Heiko Eißfeldt \n>\n> PR middle-end/124805\n> * tree-ssa.cc (verify_vssa):\n> replace recursive calls with iteration for lower stack usage","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=gmail.com 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","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"}},{"id":3684788,"web_url":"http://patchwork.ozlabs.org/comment/3684788/","msgid":"","list_archive_url":null,"date":"2026-04-30T15:25:59","subject":"Re: [PATCH] - ICE verify_vssa exceeds stack space for big functions\n [PR124805]","submitter":{"id":91428,"url":"http://patchwork.ozlabs.org/api/people/91428/","name":"Andrew Pinski","email":"andrew.pinski@oss.qualcomm.com"},"content":"On Thu, Apr 9, 2026 at 5:10 AM Richard Biener\n wrote:\n>\n> On Wed, Apr 8, 2026 at 11:32 PM Heiko Eißfeldt wrote:\n> >\n> > The source from PR124561 led to an ICE with --enable-checking, caused by a stack overflow.\n> > The recursive verification code verify_vssa in tree-ssa.cc could not handle the extreme\n> > number of basic blocks within the typical limits of stack space.\n> >\n> > As for PR124561 the recursive code was transformed into an iterative version, which\n> > avoided the recursive calls.\n> >\n> > A worklist is used, which has as entries a pair of a basic_block and a tree (vdef).\n> > The logic of verification steps for each basic_block is unchanged, although the order\n> > of basic_blocks is changed.\n> >\n> > This fixes PR124805.\n> >\n> > Reg tested OK.\n>\n> This is OK for stage1.\n\nI have now pushed this.\n\n>\n> Thanks,\n> Richard.\n>\n> > 2026-04-07 Heiko Eißfeldt \n> >\n> > PR middle-end/124805\n> > * tree-ssa.cc (verify_vssa):\n> > replace recursive calls with iteration for lower stack usage","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=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256\n header.s=qcppdkim1 header.b=POGVmmAI;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com\n header.a=rsa-sha256 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