[Sema][X86] Consider target attribute into the checks in validateOutputSize and validateInputSize.

The validateOutputSize and validateInputSize need to check whether
AVX or AVX512 are enabled. But this can be affected by the
target attribute so we need to factor that in.

This patch moves some of the code from CodeGen to create an
appropriate feature map that we can pass to the function.

Differential Revision: https://reviews.llvm.org/D68627

1 files changed, 63 insertions, 0 deletions

diff --git a/clang/lib/AST/ASTContext.cpp b/clang/lib/AST/ASTContext.cpp
index a09b1aca7c2..d26e7f789d0 100644
--- a/clang/lib/AST/ASTContext.cpp
+++ b/clang/lib/AST/ASTContext.cpp
@@ -10817,3 +10817,66 @@ QualType ASTContext::getCorrespondingSignedFixedPointType(QualType Ty) const {
     llvm_unreachable("Unexpected unsigned fixed point type");
   }
 }
+
+ParsedTargetAttr
+ASTContext::filterFunctionTargetAttrs(const TargetAttr *TD) const {
+  assert(TD != nullptr);
+  ParsedTargetAttr ParsedAttr = TD->parse();
+
+  ParsedAttr.Features.erase(
+      llvm::remove_if(ParsedAttr.Features,
+                      [&](const std::string &Feat) {
+                        return !Target->isValidFeatureName(
+                            StringRef{Feat}.substr(1));
+                      }),
+      ParsedAttr.Features.end());
+  return ParsedAttr;
+}
+
+void ASTContext::getFunctionFeatureMap(llvm::StringMap<bool> &FeatureMap,
+                                       const FunctionDecl *FD) const {
+  if (FD)
+    getFunctionFeatureMap(FeatureMap, GlobalDecl().getWithDecl(FD));
+  else
+    Target->initFeatureMap(FeatureMap, getDiagnostics(),
+                           Target->getTargetOpts().CPU,
+                           Target->getTargetOpts().Features);
+}
+
+// Fills in the supplied string map with the set of target features for the
+// passed in function.
+void ASTContext::getFunctionFeatureMap(llvm::StringMap<bool> &FeatureMap,
+                                       GlobalDecl GD) const {
+  StringRef TargetCPU = Target->getTargetOpts().CPU;
+  const FunctionDecl *FD = GD.getDecl()->getAsFunction();
+  if (const auto *TD = FD->getAttr<TargetAttr>()) {
+    ParsedTargetAttr ParsedAttr = filterFunctionTargetAttrs(TD);
+
+    // Make a copy of the features as passed on the command line into the
+    // beginning of the additional features from the function to override.
+    ParsedAttr.Features.insert(
+        ParsedAttr.Features.begin(),
+        Target->getTargetOpts().FeaturesAsWritten.begin(),
+        Target->getTargetOpts().FeaturesAsWritten.end());
+
+    if (ParsedAttr.Architecture != "" &&
+        Target->isValidCPUName(ParsedAttr.Architecture))
+      TargetCPU = ParsedAttr.Architecture;
+
+    // Now populate the feature map, first with the TargetCPU which is either
+    // the default or a new one from the target attribute string. Then we'll use
+    // the passed in features (FeaturesAsWritten) along with the new ones from
+    // the attribute.
+    Target->initFeatureMap(FeatureMap, getDiagnostics(), TargetCPU,
+                           ParsedAttr.Features);
+  } else if (const auto *SD = FD->getAttr<CPUSpecificAttr>()) {
+    llvm::SmallVector<StringRef, 32> FeaturesTmp;
+    Target->getCPUSpecificCPUDispatchFeatures(
+        SD->getCPUName(GD.getMultiVersionIndex())->getName(), FeaturesTmp);
+    std::vector<std::string> Features(FeaturesTmp.begin(), FeaturesTmp.end());
+    Target->initFeatureMap(FeatureMap, getDiagnostics(), TargetCPU, Features);
+  } else {
+    Target->initFeatureMap(FeatureMap, getDiagnostics(), TargetCPU,
+                           Target->getTargetOpts().Features);
+  }
+}