[{"id":3684855,"web_url":"http://patchwork.ozlabs.org/comment/3684855/","msgid":"","list_archive_url":null,"date":"2026-04-30T17:02:54","subject":"Re: [PATCH] x86: Remove DI_REG/SI_REG from\n x86_64_int_return_registers","submitter":{"id":808,"url":"http://patchwork.ozlabs.org/api/people/808/","name":"Uros Bizjak","email":"ubizjak@gmail.com"},"content":"On Thu, Apr 30, 2026 at 2:34 PM H.J. Lu wrote:\n>\n> Since only AX/DX register pair and XMM0/XMM1 register pair are used for\n> function return values in 64-bit mode, remove DI_REG and SI_REG registers\n> from x86_64_int_return_registers and limit the number of registers used\n> in return values to 2 in 64-bit mode.\n>\n> Tested on Linux/x86-64 and Linux/i686.\n>\n> PR target/124878\n> * config/i386/i386.cc (x86_64_int_return_registers): Remove\n> DI_REG and SI_REG.\n> (ix86_function_value_regno_p): Remove DI_REG and SI_REG cases.\n> (function_value_64): Replace X86_64_REGPARM_MAX and\n> X86_64_SSE_REGPARM_MAX with 2 for the number of registers used\n> in return values.\n\n@@ -4314,8 +4311,7 @@ function_value_64 (machine_mode orig_mode,\nmachine_mode mode,\n mode = word_mode;\n }\n\n- ret = construct_container (mode, orig_mode, valtype, true,\n- X86_64_REGPARM_MAX, X86_64_SSE_REGPARM_MAX,\n+ ret = construct_container (mode, orig_mode, valtype, true, 2, 2,\n x86_64_int_return_registers, 0);\n\nPlease introduce e.g. X86_64_MAX_RETURN_NREGS and\nX86_MAX_SSE_RETURN_NREGS to avoid magic constants.\n\nOK with the above change.\n\nThanks,\nUros.\n>\n>\n> --\n> H.J.","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=LkBYmavg;\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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Thu, 30 Apr 2026\n 10:03:07 -0700 (PDT)","MIME-Version":"1.0","References":"\n ","In-Reply-To":"\n ","From":"Uros Bizjak ","Date":"Thu, 30 Apr 2026 19:02:54 +0200","X-Gm-Features":"AVHnY4LQk9V1RmTDFtplRULl4KRmnlYyWFoI3Vm72FQbKkkdhLbMrVyOYfhpzQI","Message-ID":"\n ","Subject":"Re: [PATCH] x86: Remove DI_REG/SI_REG from\n x86_64_int_return_registers","To":"\"H.J. Lu\" ","Cc":"GCC Patches , 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":3684950,"web_url":"http://patchwork.ozlabs.org/comment/3684950/","msgid":"","list_archive_url":null,"date":"2026-04-30T21:24:44","subject":"Re: [PATCH] x86: Remove DI_REG/SI_REG from\n x86_64_int_return_registers","submitter":{"id":4387,"url":"http://patchwork.ozlabs.org/api/people/4387/","name":"H.J. Lu","email":"hjl.tools@gmail.com"},"content":"On Fri, May 1, 2026 at 1:03 AM Uros Bizjak wrote:\n>\n> On Thu, Apr 30, 2026 at 2:34 PM H.J. Lu wrote:\n> >\n> > Since only AX/DX register pair and XMM0/XMM1 register pair are used for\n> > function return values in 64-bit mode, remove DI_REG and SI_REG registers\n> > from x86_64_int_return_registers and limit the number of registers used\n> > in return values to 2 in 64-bit mode.\n> >\n> > Tested on Linux/x86-64 and Linux/i686.\n> >\n> > PR target/124878\n> > * config/i386/i386.cc (x86_64_int_return_registers): Remove\n> > DI_REG and SI_REG.\n> > (ix86_function_value_regno_p): Remove DI_REG and SI_REG cases.\n> > (function_value_64): Replace X86_64_REGPARM_MAX and\n> > X86_64_SSE_REGPARM_MAX with 2 for the number of registers used\n> > in return values.\n>\n> @@ -4314,8 +4311,7 @@ function_value_64 (machine_mode orig_mode,\n> machine_mode mode,\n> mode = word_mode;\n> }\n>\n> - ret = construct_container (mode, orig_mode, valtype, true,\n> - X86_64_REGPARM_MAX, X86_64_SSE_REGPARM_MAX,\n> + ret = construct_container (mode, orig_mode, valtype, true, 2, 2,\n> x86_64_int_return_registers, 0);\n>\n> Please introduce e.g. X86_64_MAX_RETURN_NREGS and\n> X86_MAX_SSE_RETURN_NREGS to avoid magic constants.\n>\n> OK with the above change.\n>\n\nThis is what I checked in:\n\n@@ -4315,7 +4312,8 @@ function_value_64 (machine_mode orig_mode,\nmachine_mode mode,\n }\n\n ret = construct_container (mode, orig_mode, valtype, true,\n- X86_64_REGPARM_MAX, X86_64_SSE_REGPARM_MAX,\n+ X86_64_MAX_RETURN_NREGS,\n+ X86_64_MAX_SSE_RETURN_NREGS,\n x86_64_int_return_registers, 0);\n\n /* For zero sized structures, construct_container returns NULL, but we\ndiff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h\nindex 80dafd1f9ae..21108f39938 100644\n--- a/gcc/config/i386/i386.h\n+++ b/gcc/config/i386/i386.h\n@@ -1878,6 +1878,11 @@ typedef struct ix86_args {\n #define X86_64_REGPARM_MAX 6\n #define X86_64_MS_REGPARM_MAX 4\n\n+/* Maximum numbers of registers used in return values according to x86-64\n+ psABI. */\n+#define X86_64_MAX_RETURN_NREGS 2\n+#define X86_64_MAX_SSE_RETURN_NREGS 2\n+\n #define X86_32_REGPARM_MAX 3\n\n #define REGPARM_MAX \\","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=TPAdQBA/;\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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Thu, 30 Apr 2026\n 14:25:22 -0700 (PDT)","MIME-Version":"1.0","References":"\n \n ","In-Reply-To":"\n ","From":"\"H.J. Lu\" ","Date":"Fri, 1 May 2026 05:24:44 +0800","X-Gm-Features":"AVHnY4IFdBfwt5hqRHWyayKbHgNKENsxKpsdTE27Q3g3JpCmHohfWmYUvOJ6nhY","Message-ID":"\n ","Subject":"Re: [PATCH] x86: Remove DI_REG/SI_REG from\n x86_64_int_return_registers","To":"Uros Bizjak ","Cc":"GCC Patches , Hongtao Liu ","Content-Type":"multipart/mixed; boundary=\"0000000000001b22a60650b41a60\"","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"}}]