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Wed, 17 Jan 2024 14:37:03 +0000 From: Szabolcs Nagy To: Subject: [PATCH] aarch64: Fix eh_return for -mtrack-speculation [PR112987] Date: Wed, 17 Jan 2024 14:37:03 +0000 Message-ID: <20240117143703.2998316-1-szabolcs.nagy@arm.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-EOPAttributedMessage: 1 X-MS-TrafficTypeDiagnostic: AM3PEPF00009BA1:EE_|AM9PR08MB6194:EE_|AM3PEPF0000A799:EE_|DBBPR08MB5897:EE_ X-MS-Office365-Filtering-Correlation-Id: 0cc06501-4601-4acc-6a77-08dc1769cebc x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0; X-Microsoft-Antispam-Message-Info-Original: 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 X-Forefront-Antispam-Report-Untrusted: CIP:40.67.248.234; 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Ip=[63.35.35.123]; Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: AM3PEPF0000A799.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DBBPR08MB5897 X-Spam-Status: No, score=-11.4 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, FORGED_SPF_HELO, GIT_PATCH_0, KAM_DMARC_NONE, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_PASS, SPF_NONE, TXREP, T_SCC_BODY_TEXT_LINE, UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gcc-patches-bounces+patchwork=sourceware.org@gcc.gnu.org Recent commit introduced a conditional branch in eh_return epilogues that is not compatible with speculation tracking: commit 426fddcbdad6746fe70e031f707fb07f55dfb405 Author: Szabolcs Nagy CommitDate: 2023-11-27 15:52:48 +0000 aarch64: Use br instead of ret for eh_return gcc/ChangeLog: PR target/112987 * config/aarch64/aarch64.cc (aarch64_expand_epilogue): Use explicit compare and separate jump with speculation tracking. --- gcc/config/aarch64/aarch64.cc | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc index e6bd3fd0bb4..e6de62dc02a 100644 --- a/gcc/config/aarch64/aarch64.cc +++ b/gcc/config/aarch64/aarch64.cc @@ -9879,7 +9879,17 @@ aarch64_expand_epilogue (rtx_call_insn *sibcall) is just as correct as retaining the CFA from the body of the function. Therefore, do nothing special. */ rtx label = gen_label_rtx (); - rtx x = gen_rtx_EQ (VOIDmode, EH_RETURN_TAKEN_RTX, const0_rtx); + rtx x; + if (aarch64_track_speculation) + { + /* Emit an explicit compare, so cc can be tracked. */ + rtx cc_reg = aarch64_gen_compare_reg (EQ, + EH_RETURN_TAKEN_RTX, + const0_rtx); + x = gen_rtx_EQ (GET_MODE (cc_reg), cc_reg, const0_rtx); + } + else + x = gen_rtx_EQ (VOIDmode, EH_RETURN_TAKEN_RTX, const0_rtx); x = gen_rtx_IF_THEN_ELSE (VOIDmode, x, gen_rtx_LABEL_REF (Pmode, label), pc_rtx); rtx jump = emit_jump_insn (gen_rtx_SET (pc_rtx, x));