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CTRY:IE; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:nebula.arm.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(13230040)(82310400026)(36860700013)(1800799024)(376014); DIR:OUT; SFP:1101; X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Jan 2025 09:58:39.8708 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 46fe985a-8294-4253-5874-08dd3094316d X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d; Ip=[172.205.89.229]; Helo=[nebula.arm.com] X-MS-Exchange-CrossTenant-AuthSource: AM3PEPF0000A798.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DU0PR08MB7616 X-Spam-Status: No, score=-9.7 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FORGED_SPF_HELO, GIT_PATCH_0, KAM_NUMSUBJECT, RCVD_IN_DNSWL_NONE, SPF_HELO_PASS, SPF_NONE, TXREP 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 This patch adds a warning whenever FMV is used for Aarch64. The reasoning for this is the ACLE [1] spec for FMV has diverged significantly from the current implementation and we want to prevent future compatability issues. There is a patch for and ACLE compliant version of target_version and target_clone coming eventually but it won't make gcc-15. This has been bootstrap and regression tested for Aarch64. Is this okay for master and packport to gcc-14? [1] https://github.com/ARM-software/acle/blob/main/main/acle.md#function-multi-versioning gcc/ChangeLog: * config/aarch64/aarch64.cc (aarch64_mangle_decl_assembler_name): Add experimental warning. * config/aarch64/aarch64.opt: Add command line option to disable warning. gcc/testsuite/ChangeLog: * g++.target/aarch64/mv-1.C: Add CLI flag * g++.target/aarch64/mv-symbols1.C: Add CLI flag * g++.target/aarch64/mv-symbols2.C: Add CLI flag * g++.target/aarch64/mv-symbols3.C: Add CLI flag * g++.target/aarch64/mv-symbols4.C: Add CLI flag * g++.target/aarch64/mv-symbols5.C: Add CLI flag * g++.target/aarch64/mvc-symbols1.C: Add CLI flag * g++.target/aarch64/mvc-symbols2.C: Add CLI flag * g++.target/aarch64/mvc-symbols3.C: Add CLI flag * g++.target/aarch64/mvc-symbols4.C: Add CLI flag * g++.target/aarch64/mv-warning1.C: New test. --- gcc/config/aarch64/aarch64.cc | 3 +++ gcc/config/aarch64/aarch64.opt | 4 ++++ gcc/testsuite/g++.target/aarch64/mv-1.C | 1 + gcc/testsuite/g++.target/aarch64/mv-symbols1.C | 1 + gcc/testsuite/g++.target/aarch64/mv-symbols2.C | 1 + gcc/testsuite/g++.target/aarch64/mv-symbols3.C | 1 + gcc/testsuite/g++.target/aarch64/mv-symbols4.C | 1 + gcc/testsuite/g++.target/aarch64/mv-symbols5.C | 1 + gcc/testsuite/g++.target/aarch64/mv-warning1.C | 9 +++++++++ gcc/testsuite/g++.target/aarch64/mvc-symbols1.C | 1 + gcc/testsuite/g++.target/aarch64/mvc-symbols2.C | 1 + gcc/testsuite/g++.target/aarch64/mvc-symbols3.C | 1 + gcc/testsuite/g++.target/aarch64/mvc-symbols4.C | 1 + 13 files changed, 26 insertions(+) create mode 100644 gcc/testsuite/g++.target/aarch64/mv-warning1.C diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc index 91de13159cb..afc0749fd67 100644 --- a/gcc/config/aarch64/aarch64.cc +++ b/gcc/config/aarch64/aarch64.cc @@ -20347,6 +20347,9 @@ aarch64_mangle_decl_assembler_name (tree decl, tree id) if (TREE_CODE (decl) == FUNCTION_DECL && DECL_FUNCTION_VERSIONED (decl)) { + warning_at(DECL_SOURCE_LOCATION(decl), OPT_Wexperimental_fmv_target, + "function multi-versioning support is experimental"); + aarch64_fmv_feature_mask feature_mask = get_feature_mask_for_version (decl); std::string name = IDENTIFIER_POINTER (id); diff --git a/gcc/config/aarch64/aarch64.opt b/gcc/config/aarch64/aarch64.opt index 36bc719b822..55670eeb74f 100644 --- a/gcc/config/aarch64/aarch64.opt +++ b/gcc/config/aarch64/aarch64.opt @@ -431,3 +431,7 @@ handling. One means we try to form pairs involving one or more existing individual writeback accesses where possible. A value of two means we also try to opportunistically form writeback opportunities by folding in trailing destructive updates of the base register used by a pair. + +Wexperimental-fmv-target +Target Var(warn_experimental_fmv) Warning Init(1) +Warn about usage of experimental function multi versioning diff --git a/gcc/testsuite/g++.target/aarch64/mv-1.C b/gcc/testsuite/g++.target/aarch64/mv-1.C index b4b0e5e3fea..b10037f1b9b 100644 --- a/gcc/testsuite/g++.target/aarch64/mv-1.C +++ b/gcc/testsuite/g++.target/aarch64/mv-1.C @@ -1,6 +1,7 @@ /* { dg-do compile } */ /* { dg-require-ifunc "" } */ /* { dg-options "-O0" } */ +/* { dg-additional-options "-Wno-experimental-fmv-target" } */ __attribute__((target_version("default"))) int foo () diff --git a/gcc/testsuite/g++.target/aarch64/mv-symbols1.C b/gcc/testsuite/g++.target/aarch64/mv-symbols1.C index 53e0abcd9b4..73cde42fa34 100644 --- a/gcc/testsuite/g++.target/aarch64/mv-symbols1.C +++ b/gcc/testsuite/g++.target/aarch64/mv-symbols1.C @@ -1,6 +1,7 @@ /* { dg-do compile } */ /* { dg-require-ifunc "" } */ /* { dg-options "-O0" } */ +/* { dg-additional-options "-Wno-experimental-fmv-target" } */ int foo () { diff --git a/gcc/testsuite/g++.target/aarch64/mv-symbols2.C b/gcc/testsuite/g++.target/aarch64/mv-symbols2.C index f0c7967a97a..6da88ddfb48 100644 --- a/gcc/testsuite/g++.target/aarch64/mv-symbols2.C +++ b/gcc/testsuite/g++.target/aarch64/mv-symbols2.C @@ -1,6 +1,7 @@ /* { dg-do compile } */ /* { dg-require-ifunc "" } */ /* { dg-options "-O0" } */ +/* { dg-additional-options "-Wno-experimental-fmv-target" } */ __attribute__((target_version("default"))) int foo () diff --git a/gcc/testsuite/g++.target/aarch64/mv-symbols3.C b/gcc/testsuite/g++.target/aarch64/mv-symbols3.C index 3d30e27deb8..5dd7b49be2a 100644 --- a/gcc/testsuite/g++.target/aarch64/mv-symbols3.C +++ b/gcc/testsuite/g++.target/aarch64/mv-symbols3.C @@ -1,6 +1,7 @@ /* { dg-do compile } */ /* { dg-require-ifunc "" } */ /* { dg-options "-O0" } */ +/* { dg-additional-options "-Wno-experimental-fmv-target" } */ __attribute__((target_version("default"))) int foo (); diff --git a/gcc/testsuite/g++.target/aarch64/mv-symbols4.C b/gcc/testsuite/g++.target/aarch64/mv-symbols4.C index 73e3279ec31..4b25d17cc15 100644 --- a/gcc/testsuite/g++.target/aarch64/mv-symbols4.C +++ b/gcc/testsuite/g++.target/aarch64/mv-symbols4.C @@ -1,6 +1,7 @@ /* { dg-do compile } */ /* { dg-require-ifunc "" } */ /* { dg-options "-O0" } */ +/* { dg-additional-options "-Wno-experimental-fmv-target" } */ __attribute__((target_version("default"))) int foo () diff --git a/gcc/testsuite/g++.target/aarch64/mv-symbols5.C b/gcc/testsuite/g++.target/aarch64/mv-symbols5.C index 05d1379f53e..fac00b20313 100644 --- a/gcc/testsuite/g++.target/aarch64/mv-symbols5.C +++ b/gcc/testsuite/g++.target/aarch64/mv-symbols5.C @@ -1,6 +1,7 @@ /* { dg-do compile } */ /* { dg-require-ifunc "" } */ /* { dg-options "-O0" } */ +/* { dg-additional-options "-Wno-experimental-fmv-target" } */ __attribute__((target_version("default"))) int foo (); diff --git a/gcc/testsuite/g++.target/aarch64/mv-warning1.C b/gcc/testsuite/g++.target/aarch64/mv-warning1.C new file mode 100644 index 00000000000..f1a9ecf8ed5 --- /dev/null +++ b/gcc/testsuite/g++.target/aarch64/mv-warning1.C @@ -0,0 +1,9 @@ +/* { dg-do compile } */ +/* { dg-require-ifunc "" } */ +/* { dg-options "-O0" } */ + +__attribute__((target_version("default"))) +int foo () { return 1; }/* { dg-warning "function multi-versioning support is experimental" } */ + +__attribute__((target_version("rng"))) +int foo () { return 1; }/* { dg-warning "function multi-versioning support is experimental" } */ diff --git a/gcc/testsuite/g++.target/aarch64/mvc-symbols1.C b/gcc/testsuite/g++.target/aarch64/mvc-symbols1.C index 2dd7c79f16c..983194d74af 100644 --- a/gcc/testsuite/g++.target/aarch64/mvc-symbols1.C +++ b/gcc/testsuite/g++.target/aarch64/mvc-symbols1.C @@ -1,6 +1,7 @@ /* { dg-do compile } */ /* { dg-require-ifunc "" } */ /* { dg-options "-O0" } */ +/* { dg-additional-options "-Wno-experimental-fmv-target" } */ __attribute__((target_clones("default", "dotprod", "sve+sve2"))) int foo () diff --git a/gcc/testsuite/g++.target/aarch64/mvc-symbols2.C b/gcc/testsuite/g++.target/aarch64/mvc-symbols2.C index 75b9c126dd8..58a797947ce 100644 --- a/gcc/testsuite/g++.target/aarch64/mvc-symbols2.C +++ b/gcc/testsuite/g++.target/aarch64/mvc-symbols2.C @@ -1,6 +1,7 @@ /* { dg-do compile } */ /* { dg-require-ifunc "" } */ /* { dg-options "-O0" } */ +/* { dg-additional-options "-Wno-experimental-fmv-target" } */ __attribute__((target_clones("default", "dotprod", "sve+sve2"))) int foo () diff --git a/gcc/testsuite/g++.target/aarch64/mvc-symbols3.C b/gcc/testsuite/g++.target/aarch64/mvc-symbols3.C index 82e777c8fc6..350a5586643 100644 --- a/gcc/testsuite/g++.target/aarch64/mvc-symbols3.C +++ b/gcc/testsuite/g++.target/aarch64/mvc-symbols3.C @@ -1,6 +1,7 @@ /* { dg-do compile } */ /* { dg-require-ifunc "" } */ /* { dg-options "-O0" } */ +/* { dg-additional-options "-Wno-experimental-fmv-target" } */ __attribute__((target_clones("default", "dotprod", "sve+sve2"))) int foo (); diff --git a/gcc/testsuite/g++.target/aarch64/mvc-symbols4.C b/gcc/testsuite/g++.target/aarch64/mvc-symbols4.C index 6c86ae61e5f..9c8a7bd37f2 100644 --- a/gcc/testsuite/g++.target/aarch64/mvc-symbols4.C +++ b/gcc/testsuite/g++.target/aarch64/mvc-symbols4.C @@ -1,6 +1,7 @@ /* { dg-do compile } */ /* { dg-require-ifunc "" } */ /* { dg-options "-O0" } */ +/* { dg-additional-options "-Wno-experimental-fmv-target" } */ __attribute__((target_clones("default", "dotprod", "sve+sve2"))) int foo ();