MaskRay updated this revision to Diff 133133.
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docs/ReleaseNotes.rst and use StringRef::consume_front
Repository:
rCTE Clang Tools Extra
https://reviews.llvm.org/D42983
Files:
clang-tidy/readability/CMakeLists.txt
clang-tidy/readability/ReadabilityTidyModule.cpp
clang-tidy/readability/SIMDIntrinsicsCheck.cpp
clang-tidy/readability/SIMDIntrinsicsCheck.h
docs/ReleaseNotes.rst
docs/clang-tidy/checks/list.rst
docs/clang-tidy/checks/readability-simd-intrinsics.rst
test/clang-tidy/readability-simd-intrinsics.cpp
Index: test/clang-tidy/readability-simd-intrinsics.cpp
===================================================================
--- /dev/null
+++ test/clang-tidy/readability-simd-intrinsics.cpp
@@ -0,0 +1,33 @@
+// RUN: %check_clang_tidy %s readability-simd-intrinsics %t
+
+///// X86
+typedef long long __m128i __attribute__((vector_size(16)));
+typedef double __m256 __attribute__((vector_size(32)));
+
+__m128i _mm_add_epi32(__m128i, __m128i);
+__m256 _mm256_load_pd(double const *);
+void _mm256_store_pd(double *, __m256);
+
+int _mm_add_fake(int, int);
+
+void X86() {
+ __m128i i0, i1;
+ __m256 d0;
+
+ _mm_add_epi32(i0, i1);
+// CHECK-MESSAGES: :[[@LINE-1]]:3: warning: '_mm_add_epi32' can be replaced by std::experimental::simd::operator+ [readability-simd-intrinsics]
+ d0 = _mm256_load_pd(0);
+ _mm256_store_pd(0, d0);
+
+ _mm_add_fake(0, 1);
+// CHECK-MESSAGES-NOT: :[[@LINE-1]]:
+}
+
+///// PPC
+// vector/__vector requires -maltivec, but this typedef is similar.
+typedef int vector_int __attribute__((vector_size(16)));
+
+vector_int vec_add(vector_int, vector_int);
+
+void PPC() {
+}
Index: docs/clang-tidy/checks/readability-simd-intrinsics.rst
===================================================================
--- /dev/null
+++ docs/clang-tidy/checks/readability-simd-intrinsics.rst
@@ -0,0 +1,32 @@
+.. title:: clang-tidy - simd-readability-intrinsics
+
+simd-readability-intrinsics
+===========================
+
+Finds SIMD intrinsics calls and suggests ``std::experimental::simd`` (`P0214`_) alternatives.
+
+For
+
+.. code-block:: c++
+
+ _mm_add_epi32(a, b);
+
+the check suggests an alternative:
+
+.. code-block:: c++
+
+ simd::experimental::simd::operator+
+
+Many architectures provide SIMD operations (e.g. x86 SSE/AVX, Power AltiVec/VSX,
+ARM NEON). It is common that SIMD code implementing the same algorithm, is
+written in multiple target-dispatching pieces to optimize for different
+architectures or micro-architectures.
+
+The C++ standard proposal `P0214`_ and its extensions cover many common SIMD
+operations. By migrating from target-dependent intrinsics to `P0214` operations,
+the SIMD code can be simplified and pieces for different targets can be unified.
+
+Refer to `P0214`_ for introduction and motivation for the data-parallel standard
+library.
+
+.. _P0214: http://wg21.link/p0214
Index: docs/clang-tidy/checks/list.rst
===================================================================
--- docs/clang-tidy/checks/list.rst
+++ docs/clang-tidy/checks/list.rst
@@ -216,6 +216,7 @@
readability-redundant-smartptr-get
readability-redundant-string-cstr
readability-redundant-string-init
+ readability-simd-intrinsics
readability-simplify-boolean-expr
readability-static-accessed-through-instance
readability-static-definition-in-anonymous-namespace
Index: docs/ReleaseNotes.rst
===================================================================
--- docs/ReleaseNotes.rst
+++ docs/ReleaseNotes.rst
@@ -88,6 +88,12 @@
Functions that have trailing returns are disallowed, except for those
using decltype specifiers and lambda with otherwise unutterable
return types.
+
+- New `readability-simd-intrinsics
+ <http://clang.llvm.org/extra/clang-tidy/checks/readability-simd-intrinsics.html>`_ check
+
+ Warns if SIMD intrinsics are used which can be replaced by
+ ``std::experimental::simd`` operations.
- New alias `hicpp-avoid-goto
<http://clang.llvm.org/extra/clang-tidy/checks/hicpp-avoid-goto.html>`_ to
Index: clang-tidy/readability/SIMDIntrinsicsCheck.h
===================================================================
--- /dev/null
+++ clang-tidy/readability/SIMDIntrinsicsCheck.h
@@ -0,0 +1,35 @@
+//===--- SIMDIntrinsicsCheck.h - clang-tidy----------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_SIMD_INTRINSICS_CHECK_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_SIMD_INTRINSICS_CHECK_H
+
+#include "../ClangTidy.h"
+
+namespace clang {
+namespace tidy {
+namespace readability {
+
+/// Find SIMD intrinsics calls and suggest std::experimental::simd alternatives.
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/readability-simd-intrinsics.html
+class SIMDIntrinsicsCheck : public ClangTidyCheck {
+public:
+ SIMDIntrinsicsCheck(StringRef Name, ClangTidyContext *Context)
+ : ClangTidyCheck(Name, Context) {}
+ void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+ void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+};
+
+} // namespace readability
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_SIMD_INTRINSICS_CHECK_H
Index: clang-tidy/readability/SIMDIntrinsicsCheck.cpp
===================================================================
--- /dev/null
+++ clang-tidy/readability/SIMDIntrinsicsCheck.cpp
@@ -0,0 +1,125 @@
+//===--- SIMDIntrinsicsCheck.cpp - clang-tidy------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "SIMDIntrinsicsCheck.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/Triple.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang {
+namespace tidy {
+namespace readability {
+
+static StringRef TrySuggestPPC(StringRef Name) {
+ if (!Name.consume_front("vec_"))
+ return {};
+
+ static const llvm::StringMap<std::string> Mapping{
+ // [simd.alg]
+ {"max", "std::experimental::simd::max"},
+ {"min", "std::experimental::simd::min"},
+
+ // [simd.binary]
+ {"add", "std::experimental::simd::operator+"},
+ {"sub", "std::experimental::simd::operator-"},
+ {"mul", "std::experimental::simd::operator*"},
+ };
+
+ auto It = Mapping.find(Name);
+ if (It != Mapping.end())
+ return It->second;
+ return {};
+}
+
+static StringRef TrySuggestX86(StringRef Name) {
+ if (!(Name.consume_front("_mm_") || Name.consume_front("_mm256_") ||
+ Name.consume_front("_mm512_")))
+ return {};
+
+ // [simd.alg]
+ if (Name.startswith("max_"))
+ return "std::experimental::simd::max";
+ if (Name.startswith("min_"))
+ return "std::experimental::simd::min";
+
+ // [simd.binary]
+ if (Name.startswith("add_"))
+ return "std::experimental::simd::operator+";
+ if (Name.startswith("sub_"))
+ return "std::experimental::simd::operator-";
+ if (Name.startswith("mul_"))
+ return "std::experimental::simd::operator*";
+
+ return {};
+}
+
+void SIMDIntrinsicsCheck::registerMatchers(MatchFinder *Finder) {
+ Finder->addMatcher(
+ callExpr(callee(functionDecl(matchesName("^::(_mm_|_mm256_|_mm512_|vec_)"))),
+ unless(isExpansionInSystemHeader()))
+ .bind("call"),
+ this);
+}
+
+void SIMDIntrinsicsCheck::check(const MatchFinder::MatchResult &Result) {
+ // libcxx implementation of std::experimental::simd requires at least C++11.
+ if (!Result.Context->getLangOpts().CPlusPlus11)
+ return;
+
+ const auto *Call = Result.Nodes.getNodeAs<CallExpr>("call");
+ assert(Call != nullptr);
+
+ // If the callee has parameter of VectorType or pointer to VectorType,
+ // or the return type is VectorType, we consider it a candidate of a
+ // SIMD intrinsic call.
+ const FunctionDecl *Callee = Call->getDirectCallee();
+ if (!Callee)
+ return;
+ bool IsVector = Callee->getReturnType()->isVectorType();
+ for (const ParmVarDecl *Parm : Callee->parameters()) {
+ QualType Type = Parm->getType();
+ if (Type->isPointerType())
+ Type = Type->getPointeeType();
+ if (Type->isVectorType())
+ IsVector = true;
+ }
+ if (!IsVector)
+ return;
+
+ StringRef Old = Callee->getName();
+ StringRef New;
+
+ llvm::Triple::ArchType Arch =
+ Result.Context->getTargetInfo().getTriple().getArch();
+ switch (Arch) {
+ default:
+ break;
+ case llvm::Triple::ppc:
+ case llvm::Triple::ppc64:
+ case llvm::Triple::ppc64le:
+ New = TrySuggestPPC(Old);
+ break;
+ case llvm::Triple::x86:
+ case llvm::Triple::x86_64:
+ New = TrySuggestX86(Old);
+ break;
+ }
+
+ if (!New.empty()) {
+ std::string Message = (Twine("'") + Old + "' can be replaced by " + New).str();
+ diag(Call->getExprLoc(), Message);
+ }
+}
+
+} // namespace readability
+} // namespace tidy
+} // namespace clang
Index: clang-tidy/readability/ReadabilityTidyModule.cpp
===================================================================
--- clang-tidy/readability/ReadabilityTidyModule.cpp
+++ clang-tidy/readability/ReadabilityTidyModule.cpp
@@ -31,6 +31,7 @@
#include "RedundantSmartptrGetCheck.h"
#include "RedundantStringCStrCheck.h"
#include "RedundantStringInitCheck.h"
+#include "SIMDIntrinsicsCheck.h"
#include "SimplifyBooleanExprCheck.h"
#include "StaticAccessedThroughInstanceCheck.h"
#include "StaticDefinitionInAnonymousNamespaceCheck.h"
@@ -92,6 +93,8 @@
"readability-redundant-string-cstr");
CheckFactories.registerCheck<RedundantStringInitCheck>(
"readability-redundant-string-init");
+ CheckFactories.registerCheck<SIMDIntrinsicsCheck>(
+ "readability-simd-intrinsics");
CheckFactories.registerCheck<SimplifyBooleanExprCheck>(
"readability-simplify-boolean-expr");
CheckFactories.registerCheck<UniqueptrDeleteReleaseCheck>(
Index: clang-tidy/readability/CMakeLists.txt
===================================================================
--- clang-tidy/readability/CMakeLists.txt
+++ clang-tidy/readability/CMakeLists.txt
@@ -24,6 +24,7 @@
RedundantStringCStrCheck.cpp
RedundantSmartptrGetCheck.cpp
RedundantStringInitCheck.cpp
+ SIMDIntrinsicsCheck.cpp
SimplifyBooleanExprCheck.cpp
StaticAccessedThroughInstanceCheck.cpp
StaticDefinitionInAnonymousNamespaceCheck.cpp
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