From dcec2ac4f353c3813f45392dbd0b4d3c5ee66e06 Mon Sep 17 00:00:00 2001
From: Alexey Bataev <a.bataev@hotmail.com>
Date: Tue, 5 Nov 2019 15:33:18 -0500
Subject: [OPENMP50]Simplify processing of context selector scores.

If the context selector score was not specified, its value must be set
to 0. Simplify the processing of unspecified scores + save memory in
attribute representation.
---
 clang/lib/CodeGen/CGOpenMPRuntime.cpp | 38 +----------------------------------
 1 file changed, 1 insertion(+), 37 deletions(-)

(limited to 'clang/lib/CodeGen/CGOpenMPRuntime.cpp')

diff --git a/clang/lib/CodeGen/CGOpenMPRuntime.cpp b/clang/lib/CodeGen/CGOpenMPRuntime.cpp
index 514457d9e4a..b48c52dbc1e 100644
--- a/clang/lib/CodeGen/CGOpenMPRuntime.cpp
+++ b/clang/lib/CodeGen/CGOpenMPRuntime.cpp
@@ -11044,41 +11044,11 @@ bool checkContext<OMPDeclareVariantAttr::CtxSetImplementation,
 }
 
 static bool greaterCtxScore(ASTContext &Ctx, const Expr *LHS, const Expr *RHS) {
-  // If both scores are unknown, choose the very first one.
-  if (!LHS && !RHS)
-    return true;
-  // If only one is known, return this one.
-  if (LHS && !RHS)
-    return true;
-  if (!LHS && RHS)
-    return false;
   llvm::APSInt LHSVal = LHS->EvaluateKnownConstInt(Ctx);
   llvm::APSInt RHSVal = RHS->EvaluateKnownConstInt(Ctx);
   return llvm::APSInt::compareValues(LHSVal, RHSVal) >= 0;
 }
 
-namespace {
-/// Comparator for the priority queue for context selector.
-class OMPDeclareVariantAttrComparer
-    : public std::greater<const OMPDeclareVariantAttr *> {
-private:
-  ASTContext &Ctx;
-
-public:
-  OMPDeclareVariantAttrComparer(ASTContext &Ctx) : Ctx(Ctx) {}
-  bool operator()(const OMPDeclareVariantAttr *LHS,
-                  const OMPDeclareVariantAttr *RHS) const {
-    const Expr *LHSExpr = nullptr;
-    const Expr *RHSExpr = nullptr;
-    if (LHS->getCtxScore() == OMPDeclareVariantAttr::ScoreSpecified)
-      LHSExpr = LHS->getScore();
-    if (RHS->getCtxScore() == OMPDeclareVariantAttr::ScoreSpecified)
-      RHSExpr = RHS->getScore();
-    return greaterCtxScore(Ctx, LHSExpr, RHSExpr);
-  }
-};
-} // anonymous namespace
-
 /// Finds the variant function that matches current context with its context
 /// selector.
 static const FunctionDecl *getDeclareVariantFunction(ASTContext &Ctx,
@@ -11088,13 +11058,7 @@ static const FunctionDecl *getDeclareVariantFunction(ASTContext &Ctx,
   // Iterate through all DeclareVariant attributes and check context selectors.
   auto &&Comparer = [&Ctx](const OMPDeclareVariantAttr *LHS,
                            const OMPDeclareVariantAttr *RHS) {
-    const Expr *LHSExpr = nullptr;
-    const Expr *RHSExpr = nullptr;
-    if (LHS->getCtxScore() == OMPDeclareVariantAttr::ScoreSpecified)
-      LHSExpr = LHS->getScore();
-    if (RHS->getCtxScore() == OMPDeclareVariantAttr::ScoreSpecified)
-      RHSExpr = RHS->getScore();
-    return greaterCtxScore(Ctx, LHSExpr, RHSExpr);
+    return greaterCtxScore(Ctx, LHS->getScore(), RHS->getScore());
   };
   const OMPDeclareVariantAttr *TopMostAttr = nullptr;
   for (const auto *A : FD->specific_attrs<OMPDeclareVariantAttr>()) {
-- 
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