{"id":2231274,"url":"http://patchwork.ozlabs.org/api/patches/2231274/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/patch/CAMe9rOoRiWXD5aNq19F9R-S9D5=y7-dk_Kp6i_dibPKaoypR7g@mail.gmail.com/","project":{"id":17,"url":"http://patchwork.ozlabs.org/api/projects/17/?format=json","name":"GNU Compiler Collection","link_name":"gcc","list_id":"gcc-patches.gcc.gnu.org","list_email":"gcc-patches@gcc.gnu.org","web_url":null,"scm_url":null,"webscm_url":null,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"","list_archive_url":null,"date":"2026-04-30T12:33:36","name":"x86: Remove DI_REG/SI_REG from x86_64_int_return_registers","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"88d2e286d276b4dae273e3223fa3e64608dab5a1","submitter":{"id":4387,"url":"http://patchwork.ozlabs.org/api/people/4387/?format=json","name":"H.J. Lu","email":"hjl.tools@gmail.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/gcc/patch/CAMe9rOoRiWXD5aNq19F9R-S9D5=y7-dk_Kp6i_dibPKaoypR7g@mail.gmail.com/mbox/","series":[{"id":502302,"url":"http://patchwork.ozlabs.org/api/series/502302/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/list/?series=502302","date":"2026-04-30T12:33:36","name":"x86: Remove DI_REG/SI_REG from x86_64_int_return_registers","version":1,"mbox":"http://patchwork.ozlabs.org/series/502302/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2231274/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2231274/checks/","tags":{},"related":[],"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=Sly8DiM7;\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 05:34:12 -0700 (PDT)","MIME-Version":"1.0","From":"\"H.J. Lu\" ","Date":"Thu, 30 Apr 2026 20:33:36 +0800","X-Gm-Features":"AVHnY4L9LEO7WYKqgT_lPJmLLP4n0PBI8Mmk16mLTjQGwxH9eXLbFB9D2WreKa4","Message-ID":"\n ","Subject":"[PATCH] x86: Remove DI_REG/SI_REG from x86_64_int_return_registers","To":"GCC Patches , Uros Bizjak ,\n Hongtao Liu ","Content-Type":"multipart/mixed; boundary=\"000000000000870f6d0650acae99\"","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"},"content":"Since only AX/DX register pair and XMM0/XMM1 register pair are used for\nfunction return values in 64-bit mode, remove DI_REG and SI_REG registers\nfrom x86_64_int_return_registers and limit the number of registers used\nin return values to 2 in 64-bit mode.\n\nTested on Linux/x86-64 and Linux/i686.\n\nPR target/124878\n* config/i386/i386.cc (x86_64_int_return_registers): Remove\nDI_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\nX86_64_SSE_REGPARM_MAX with 2 for the number of registers used\nin return values.","diff":"From 5e79db8021ff2b54275c4c966852f37a2d536c26 Mon Sep 17 00:00:00 2001\nFrom: \"H.J. Lu\" \nDate: Wed, 15 Apr 2026 13:43:08 +0800\nSubject: [PATCH] x86: Remove DI_REG/SI_REG from x86_64_int_return_registers\n\nSince only AX/DX register pair and XMM0/XMM1 register pair are used for\nfunction return values in 64-bit mode, remove DI_REG and SI_REG registers\nfrom x86_64_int_return_registers and limit the number of registers used\nin return values to 2 in 64-bit mode.\n\nTested on Linux/x86-64 and Linux/i686.\n\n\tPR target/124878\n\t* config/i386/i386.cc (x86_64_int_return_registers): Remove\n\tDI_REG and SI_REG.\n\t(ix86_function_value_regno_p): Remove DI_REG and SI_REG cases.\n\t(function_value_64): Replace X86_64_REGPARM_MAX and\n\tX86_64_SSE_REGPARM_MAX with 2 for the number of registers used\n\tin return values.\n\nSigned-off-by: H.J. Lu \n---\n gcc/config/i386/i386.cc | 10 +++-------\n 1 file changed, 3 insertions(+), 7 deletions(-)\n\ndiff --git a/gcc/config/i386/i386.cc b/gcc/config/i386/i386.cc\nindex 428394985a1..4229028f46f 100644\n--- a/gcc/config/i386/i386.cc\n+++ b/gcc/config/i386/i386.cc\n@@ -343,9 +343,9 @@ static int const x86_64_preserve_none_int_parameter_registers[6] =\n R12_REG, R13_REG, R14_REG, R15_REG, DI_REG, SI_REG\n };\n \n-static int const x86_64_int_return_registers[4] =\n+static int const x86_64_int_return_registers[2] =\n {\n- AX_REG, DX_REG, DI_REG, SI_REG\n+ AX_REG, DX_REG\n };\n \n /* Define the structure for the machine field in struct function. */\n@@ -3875,9 +3875,6 @@ ix86_function_value_regno_p (const unsigned int regno)\n return true;\n case DX_REG:\n return (!TARGET_64BIT || ix86_cfun_abi () != MS_ABI);\n- case DI_REG:\n- case SI_REG:\n- return TARGET_64BIT && ix86_cfun_abi () != MS_ABI;\n \n /* Complex values are returned in %st(0)/%st(1) pair. */\n case ST0_REG:\n@@ -4314,8 +4311,7 @@ function_value_64 (machine_mode orig_mode, machine_mode mode,\n mode = word_mode;\n }\n \n- ret = construct_container (mode, orig_mode, valtype, true,\n-\t\t\t X86_64_REGPARM_MAX, X86_64_SSE_REGPARM_MAX,\n+ ret = construct_container (mode, orig_mode, valtype, true, 2, 2,\n \t\t\t x86_64_int_return_registers, 0);\n \n /* For zero sized structures, construct_container returns NULL, but we\n-- \n2.53.0\n\n","prefixes":[]}