llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT--> @llvm/pr-subscribers-clang Author: Jon Roelofs (jroelofs) <details> <summary>Changes</summary> We should only warn if the default version is the one that is unused. Fixes: https://github.com/llvm/llvm-project/issues/80227 --- Full diff: https://github.com/llvm/llvm-project/pull/81167.diff 4 Files Affected: - (modified) clang/include/clang/AST/Decl.h (+4) - (modified) clang/lib/AST/Decl.cpp (+5) - (modified) clang/lib/Sema/Sema.cpp (+1-1) - (modified) clang/test/SemaCXX/warn-unused-filescoped.cpp (+16) ``````````diff diff --git a/clang/include/clang/AST/Decl.h b/clang/include/clang/AST/Decl.h index f26fb5ad5f133..854e466cfd6b0 100644 --- a/clang/include/clang/AST/Decl.h +++ b/clang/include/clang/AST/Decl.h @@ -2615,6 +2615,10 @@ class FunctionDecl : public DeclaratorDecl, /// the target functionality. bool isTargetMultiVersion() const; + /// True if this function is the default version of a multiversioned dispatch + /// function as a part of the target functionality. + bool isTargetMultiVersionDefault() const; + /// True if this function is a multiversioned dispatch function as a part of /// the target-clones functionality. bool isTargetClonesMultiVersion() const; diff --git a/clang/lib/AST/Decl.cpp b/clang/lib/AST/Decl.cpp index 26fdfa040796e..8a79f5c0b04f7 100644 --- a/clang/lib/AST/Decl.cpp +++ b/clang/lib/AST/Decl.cpp @@ -3537,6 +3537,11 @@ bool FunctionDecl::isTargetMultiVersion() const { (hasAttr<TargetAttr>() || hasAttr<TargetVersionAttr>()); } +bool FunctionDecl::isTargetMultiVersionDefault() const { + return isMultiVersion() && hasAttr<TargetVersionAttr>() && + getAttr<TargetVersionAttr>()->isDefaultVersion(); +} + bool FunctionDecl::isTargetClonesMultiVersion() const { return isMultiVersion() && hasAttr<TargetClonesAttr>(); } diff --git a/clang/lib/Sema/Sema.cpp b/clang/lib/Sema/Sema.cpp index 2d4e6d1d058cd..58cbcc30e098a 100644 --- a/clang/lib/Sema/Sema.cpp +++ b/clang/lib/Sema/Sema.cpp @@ -1393,7 +1393,7 @@ void Sema::ActOnEndOfTranslationUnit() { Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl) << /*function=*/0 << DiagD << DiagRange; } - } else { + } else if (!FD->isTargetMultiVersion() || FD->isTargetMultiVersionDefault()) { if (FD->getDescribedFunctionTemplate()) Diag(DiagD->getLocation(), diag::warn_unused_template) << /*function=*/0 << DiagD << DiagRange; diff --git a/clang/test/SemaCXX/warn-unused-filescoped.cpp b/clang/test/SemaCXX/warn-unused-filescoped.cpp index be8d350855c07..0c347e9e19c9d 100644 --- a/clang/test/SemaCXX/warn-unused-filescoped.cpp +++ b/clang/test/SemaCXX/warn-unused-filescoped.cpp @@ -236,4 +236,20 @@ constexpr int constexpr4() { return 2; } #endif } +__attribute__((target_version("fp16"))) +static int not_used_fmv(void) { return 1; } +__attribute__((target_version("fp16fml"))) +static int not_used_fmv(void) { return 2; } +__attribute__((target_version("default"))) +static int not_used_fmv(void) { return 0; } // expected-warning {{unused function 'not_used_fmv'}} + + +__attribute__((target_version("fp16"))) +static int definitely_used_fmv(void) { return 1; } +__attribute__((target_version("fp16fml"))) +static int definitely_used_fmv(void) { return 2; } +__attribute__((target_version("default"))) +static int definitely_used_fmv(void) { return 0; } +int definite_user(void) { return definitely_used_fmv(); } + #endif `````````` </details> https://github.com/llvm/llvm-project/pull/81167 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
