[{"id":3681282,"web_url":"http://patchwork.ozlabs.org/comment/3681282/","msgid":"","list_archive_url":null,"date":"2026-04-23T06:22:37","subject":"Re: [PATCH] x86: Don't check SSE2 in x86_cse::gate","submitter":{"id":808,"url":"http://patchwork.ozlabs.org/api/people/808/","name":"Uros Bizjak","email":"ubizjak@gmail.com"},"content":"On Thu, Apr 23, 2026 at 12:56 AM H.J. Lu wrote:\n>\n> commit 5cf1b9a03ec5b617af8c50c1e9c0d223083fd7f2\n> Author: H.J. Lu \n> Date: Fri Aug 19 11:50:41 2022 -0700\n>\n> x86-64: Remove redundant TLS calls\n>\n> changed the x86_cse pass to also remove redundant TLS calls. Remove the\n> SSE2 check in x86_cse::gate so that redundant TLS calls are removed when\n> SSE is disabled.\n>\n> gcc/\n>\n> PR target/124994\n> * config/i386/i386-features.cc (x86_cse::gate): Drop TARGET_SSE2.\n>\n> gcc/testsuite/\n>\n> PR target/124994\n> * gcc.target/i386/pr124994.c: New test.\n>\n> OK for master and GCC 16 branch?\n\nOK, needs RM's approval for the gcc-16 branch.\n\nThanks,\nUros.","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=QwJIVBtN;\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=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=QwJIVBtN","sourceware.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","sourceware.org; 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Wed, 22 Apr 2026\n 23:22:48 -0700 (PDT)","MIME-Version":"1.0","References":"\n ","In-Reply-To":"\n ","From":"Uros Bizjak ","Date":"Thu, 23 Apr 2026 08:22:37 +0200","X-Gm-Features":"AQROBzBD4apFe5N1Mz6eF6bRjlzzXwWfMs64I_ZgK6ab7kWU9rynq1yR5ChHjO0","Message-ID":"\n ","Subject":"Re: [PATCH] x86: Don't check SSE2 in x86_cse::gate","To":"\"H.J. Lu\" ","Cc":"GCC Patches , Jakub Jelinek ,\n Hongtao Liu ","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":3681288,"web_url":"http://patchwork.ozlabs.org/comment/3681288/","msgid":"","list_archive_url":null,"date":"2026-04-23T06:45:13","subject":"Re: [PATCH] x86: Don't check SSE2 in x86_cse::gate","submitter":{"id":671,"url":"http://patchwork.ozlabs.org/api/people/671/","name":"Jakub Jelinek","email":"jakub@redhat.com"},"content":"On Thu, Apr 23, 2026 at 08:22:37AM +0200, Uros Bizjak wrote:\n> On Thu, Apr 23, 2026 at 12:56 AM H.J. Lu wrote:\n> >\n> > commit 5cf1b9a03ec5b617af8c50c1e9c0d223083fd7f2\n> > Author: H.J. Lu \n> > Date: Fri Aug 19 11:50:41 2022 -0700\n> >\n> > x86-64: Remove redundant TLS calls\n> >\n> > changed the x86_cse pass to also remove redundant TLS calls. Remove the\n> > SSE2 check in x86_cse::gate so that redundant TLS calls are removed when\n> > SSE is disabled.\n> >\n> > gcc/\n> >\n> > PR target/124994\n> > * config/i386/i386-features.cc (x86_cse::gate): Drop TARGET_SSE2.\n> >\n> > gcc/testsuite/\n> >\n> > PR target/124994\n> > * gcc.target/i386/pr124994.c: New test.\n> >\n> > OK for master and GCC 16 branch?\n> \n> OK, needs RM's approval for the gcc-16 branch.\n\nTo me this doesn't look like a 16.1 blocker, not removing redundant TLS\ncalls is just a missed optimization. Whether it is desirable for 16.2 is\nanother question, I guess this isn't a regression (were we removing\nredundant TLS calls in 15 even with -mno-sse?), so it would need an\nexception.\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=h05sOM5M;\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 (1024-bit key,\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=h05sOM5M","sourceware.org; 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Lu\" , GCC Patches ,\n Hongtao Liu ","Subject":"Re: [PATCH] x86: Don't check SSE2 in x86_cse::gate","Message-ID":"","References":"\n \n ","MIME-Version":"1.0","In-Reply-To":"\n ","X-Scanned-By":"MIMEDefang 3.4.1 on 10.30.177.93","X-Mimecast-Spam-Score":"0","X-Mimecast-MFC-PROC-ID":"9dWp2VitRnk4ggBycdjoT4TdC0OOugEWV0whdBZJgNs_1776926718","X-Mimecast-Originator":"redhat.com","Content-Type":"text/plain; charset=utf-8","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":3681498,"web_url":"http://patchwork.ozlabs.org/comment/3681498/","msgid":"","list_archive_url":null,"date":"2026-04-23T14:27:15","subject":"Re: [PATCH] x86: Don't check SSE2 in x86_cse::gate","submitter":{"id":4362,"url":"http://patchwork.ozlabs.org/api/people/4362/","name":"Rainer Orth","email":"ro@CeBiTec.Uni-Bielefeld.DE"},"content":"Hi H.J.,\n\n> commit 5cf1b9a03ec5b617af8c50c1e9c0d223083fd7f2\n> Author: H.J. Lu \n> Date: Fri Aug 19 11:50:41 2022 -0700\n>\n> x86-64: Remove redundant TLS calls\n>\n> changed the x86_cse pass to also remove redundant TLS calls. Remove the\n> SSE2 check in x86_cse::gate so that redundant TLS calls are removed when\n> SSE is disabled.\n\nI strongly suspect that this patch broke i686-pc-linux-gnu bootstrap:\n\nduring RTL pass: x86_cse\n/vol/gcc/src/hg/master/local/libgomp/target.c: In function 'gomp_map_vars.constprop':\n/vol/gcc/src/hg/master/local/libgomp/target.c:2155:1: internal compiler error: in as_a, at machmode.h:391\n 2155 | }\n | ^\n0xb1055c5 internal_error(char const*, ...)\n\t/vol/gcc/src/hg/master/local/gcc/diagnostic-global-context.cc:787\n0xb112581 fancy_abort(char const*, int, char const*)\n\t/vol/gcc/src/hg/master/local/gcc/diagnostics/context.cc:1813\n0x8bcea23 scalar_mode as_a(machine_mode)\n\t/vol/gcc/src/hg/master/local/gcc/machmode.h:391\n0x9bc6ebe ix86_get_vector_cse_mode\n\t/vol/gcc/src/hg/master/local/gcc/config/i386/i386-features.cc:3609\n0x9bc9190 x86_cse\n\t/vol/gcc/src/hg/master/local/gcc/config/i386/i386-features.cc:4710\n0x9bc874c execute\n\t/vol/gcc/src/hg/master/local/gcc/config/i386/i386-features.cc:4326\n\n\tRainer","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=cebitec.uni-bielefeld.de header.i=@cebitec.uni-bielefeld.de\n header.a=rsa-sha256 header.s=20200306 header.b=NSMA6r2V;\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; 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b=NSMA6r2V/XkkJefwDv52aKkJqEnP52Mr3PPeloqeVGCqq/W2t3AOn\n tEHqfZKNqvVlPj+uzh0T/oiYOsRfvJDNLVJ2uA0r0hhhou6yBDeG0BXT+GPCJZGK\n OVlkB/ekYHik8ISXeAEOQKKFk76x+FNPGKFMHIXE47jYI1mJKHIukfQSnUzU+4YD\n kvwcmcMrkMYxTDGu02k6A8GQ+H2mlDDFN12lbi58c0kNcIrxT4TKI2hPs8P1vhLx\n 0D7v4gqu056tJwt8MHz/cC1EhoqrjPITA6QoKlBxX9mmf8OV60Fgo9AImszNYse+\n bYmxKC2rOQKbxw5vUos+c6p4AQtCIW/8g==","X-Virus-Scanned":"amavisd-new at cebitec.uni-bielefeld.de","From":"Rainer Orth ","To":"\"H.J. Lu\" ","Cc":"GCC Patches , Jakub Jelinek\n , Uros Bizjak , Hongtao Liu\n ","Subject":"Re: [PATCH] x86: Don't check SSE2 in x86_cse::gate","In-Reply-To":"\n \n (H. J. Lu's message of \"Thu, 23 Apr 2026 06:55:26 +0800\")","References":"\n ","Date":"Thu, 23 Apr 2026 16:27:15 +0200","Message-ID":"","User-Agent":"Gnus/5.13 (Gnus v5.13)","MIME-Version":"1.0","Content-Type":"text/plain","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":3681580,"web_url":"http://patchwork.ozlabs.org/comment/3681580/","msgid":"","list_archive_url":null,"date":"2026-04-23T17:14:42","subject":"Re: [PATCH] x86: Don't check SSE2 in x86_cse::gate","submitter":{"id":4362,"url":"http://patchwork.ozlabs.org/api/people/4362/","name":"Rainer Orth","email":"ro@CeBiTec.Uni-Bielefeld.DE"},"content":"Hi H.J.,\n\n>> commit 5cf1b9a03ec5b617af8c50c1e9c0d223083fd7f2\n>> Author: H.J. Lu \n>> Date: Fri Aug 19 11:50:41 2022 -0700\n>>\n>> x86-64: Remove redundant TLS calls\n>>\n>> changed the x86_cse pass to also remove redundant TLS calls. Remove the\n>> SSE2 check in x86_cse::gate so that redundant TLS calls are removed when\n>> SSE is disabled.\n>\n> I strongly suspect that this patch broke i686-pc-linux-gnu bootstrap:\n>\n> during RTL pass: x86_cse\n> /vol/gcc/src/hg/master/local/libgomp/target.c: In function 'gomp_map_vars.constprop':\n> /vol/gcc/src/hg/master/local/libgomp/target.c:2155:1: internal compiler error: in as_a, at machmode.h:391\n> 2155 | }\n> | ^\n> 0xb1055c5 internal_error(char const*, ...)\n> \t/vol/gcc/src/hg/master/local/gcc/diagnostic-global-context.cc:787\n> 0xb112581 fancy_abort(char const*, int, char const*)\n> \t/vol/gcc/src/hg/master/local/gcc/diagnostics/context.cc:1813\n> 0x8bcea23 scalar_mode as_a(machine_mode)\n> \t/vol/gcc/src/hg/master/local/gcc/machmode.h:391\n> 0x9bc6ebe ix86_get_vector_cse_mode\n> \t/vol/gcc/src/hg/master/local/gcc/config/i386/i386-features.cc:3609\n> 0x9bc9190 x86_cse\n> \t/vol/gcc/src/hg/master/local/gcc/config/i386/i386-features.cc:4710\n> 0x9bc874c execute\n> \t/vol/gcc/src/hg/master/local/gcc/config/i386/i386-features.cc:4326\n\nconfirmed: reverting the patch allows the bootstrap to succeed.\n\n\tRainer","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=cebitec.uni-bielefeld.de header.i=@cebitec.uni-bielefeld.de\n header.a=rsa-sha256 header.s=20200306 header.b=CxQgULFb;\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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b=CxQgULFb2H3AUooL5fJcJYuILzOaFM+xVB2z0MrB/ezw8hDKIrsrg\n JOm39YsQsiktFeH4Uche60jPCYvuPNgVeCqro61JSwBLcNkZN39Bja6ZVt5JUFaT\n 5wi6g6qS9spqOo8xl9e1/qNGA9aYqzA5+0GgXiDvL33e0Ce+WzINgPMZopMBvbGl\n cz1BA7Oi6+p9IJtnyoDqy7Ax2+rnX+q21yiKchon47gnS97+6nosUdgpbIRB2xA1\n WgdkvTuKVwBNxoqQVY6FWEWl7YfelcQ+6WnP/bwJE3ULvMA22vVSMQTkFldcpzly\n D3YpBBRkau6F/ge2e8NmfhpOyYtjTI+5g==","X-Virus-Scanned":"amavisd-new at cebitec.uni-bielefeld.de","From":"Rainer Orth ","To":"\"H.J. Lu\" ","Cc":"GCC Patches , Jakub Jelinek\n , Uros Bizjak , Hongtao Liu\n ","Subject":"Re: [PATCH] x86: Don't check SSE2 in x86_cse::gate","In-Reply-To":" (Rainer Orth's message\n of \"Thu, 23 Apr 2026 16:27:15 +0200\")","References":"\n \n ","Date":"Thu, 23 Apr 2026 19:14:42 +0200","Message-ID":"","User-Agent":"Gnus/5.13 (Gnus v5.13)","MIME-Version":"1.0","Content-Type":"text/plain","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":3681702,"web_url":"http://patchwork.ozlabs.org/comment/3681702/","msgid":"","list_archive_url":null,"date":"2026-04-23T22:36:37","subject":"Re: [PATCH] x86: Don't check SSE2 in x86_cse::gate","submitter":{"id":4387,"url":"http://patchwork.ozlabs.org/api/people/4387/","name":"H.J. Lu","email":"hjl.tools@gmail.com"},"content":"On Fri, Apr 24, 2026 at 1:14 AM Rainer Orth wrote:\n>\n> Hi H.J.,\n>\n> >> commit 5cf1b9a03ec5b617af8c50c1e9c0d223083fd7f2\n> >> Author: H.J. Lu \n> >> Date: Fri Aug 19 11:50:41 2022 -0700\n> >>\n> >> x86-64: Remove redundant TLS calls\n> >>\n> >> changed the x86_cse pass to also remove redundant TLS calls. Remove the\n> >> SSE2 check in x86_cse::gate so that redundant TLS calls are removed when\n> >> SSE is disabled.\n> >\n> > I strongly suspect that this patch broke i686-pc-linux-gnu bootstrap:\n> >\n> > during RTL pass: x86_cse\n> > /vol/gcc/src/hg/master/local/libgomp/target.c: In function 'gomp_map_vars.constprop':\n> > /vol/gcc/src/hg/master/local/libgomp/target.c:2155:1: internal compiler error: in as_a, at machmode.h:391\n> > 2155 | }\n> > | ^\n> > 0xb1055c5 internal_error(char const*, ...)\n> > /vol/gcc/src/hg/master/local/gcc/diagnostic-global-context.cc:787\n> > 0xb112581 fancy_abort(char const*, int, char const*)\n> > /vol/gcc/src/hg/master/local/gcc/diagnostics/context.cc:1813\n> > 0x8bcea23 scalar_mode as_a(machine_mode)\n> > /vol/gcc/src/hg/master/local/gcc/machmode.h:391\n> > 0x9bc6ebe ix86_get_vector_cse_mode\n> > /vol/gcc/src/hg/master/local/gcc/config/i386/i386-features.cc:3609\n> > 0x9bc9190 x86_cse\n> > /vol/gcc/src/hg/master/local/gcc/config/i386/i386-features.cc:4710\n> > 0x9bc874c execute\n> > /vol/gcc/src/hg/master/local/gcc/config/i386/i386-features.cc:4326\n>\n> confirmed: reverting the patch allows the bootstrap to succeed.\n\nTesting this:\n\ndiff --git a/gcc/config/i386/i386-features.cc b/gcc/config/i386/i386-features.cc\nindex 0dd278a3ea6..da5a7c9ceda 100644\n--- a/gcc/config/i386/i386-features.cc\n+++ b/gcc/config/i386/i386-features.cc\n@@ -3759,7 +3759,13 @@ ix86_broadcast_inner (rtx op, machine_mode mode,\n if (!rtx_equal_p (tmp, first))\n return nullptr;\n }\n- *scalar_mode_p = GET_MODE (first);\n+ /* Use QImode, instead of E_VOIDmode, for\n+ (const_vector:V2QI [(const_int 0 [0]) repeated x2])\n+ */\n+ if (CONST_INT_P (first))\n+ *scalar_mode_p = GET_MODE_INNER (mode);\n+ else\n+ *scalar_mode_p = GET_MODE (first);\n *insn_p = nullptr;\n return first;\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 (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=PPs1GoBM;\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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Lu\" ","Date":"Fri, 24 Apr 2026 06:36:37 +0800","X-Gm-Features":"AQROBzBNg6TmLtArhcUw_yPy48jfkB1K_11QzpIFEO7s00ubV6lL7MI76Ljg5tE","Message-ID":"\n ","Subject":"Re: [PATCH] x86: Don't check SSE2 in x86_cse::gate","To":"Rainer Orth ","Cc":"GCC Patches , Jakub Jelinek ,\n Uros Bizjak , Hongtao Liu ","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"}}]