From f382538d471e38a9b98f016c4caebd24c8d60b62 Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Thu, 1 Jun 2017 20:58:36 +0000
Subject: Vendor import of llvm trunk r304460:
 https://llvm.org/svn/llvm-project/llvm/trunk@304460

---
 lib/IR/Attributes.cpp | 45 ++++++++++++++++++++++++++++-----------------
 1 file changed, 28 insertions(+), 17 deletions(-)

(limited to 'lib/IR/Attributes.cpp')

diff --git a/lib/IR/Attributes.cpp b/lib/IR/Attributes.cpp
index 19b7c3027232..a76c944f0005 100644
--- a/lib/IR/Attributes.cpp
+++ b/lib/IR/Attributes.cpp
@@ -1006,6 +1006,10 @@ AttributeList AttributeList::get(LLVMContext &C,
   for (AttributeList List : Attrs)
     MaxSize = std::max(MaxSize, List.getNumAttrSets());
 
+  // If every list was empty, there is no point in merging the lists.
+  if (MaxSize == 0)
+    return AttributeList();
+
   SmallVector<AttributeSet, 8> NewAttrSets(MaxSize);
   for (unsigned I = 0; I < MaxSize; ++I) {
     AttrBuilder CurBuilder;
@@ -1033,24 +1037,11 @@ AttributeList AttributeList::addAttribute(LLVMContext &C, unsigned Index,
   return addAttributes(C, Index, B);
 }
 
-AttributeList AttributeList::addAttribute(LLVMContext &C,
-                                          ArrayRef<unsigned> Indices,
+AttributeList AttributeList::addAttribute(LLVMContext &C, unsigned Index,
                                           Attribute A) const {
-  assert(std::is_sorted(Indices.begin(), Indices.end()));
-
-  SmallVector<AttributeSet, 4> AttrSets(this->begin(), this->end());
-  unsigned MaxIndex = attrIdxToArrayIdx(Indices.back());
-  if (MaxIndex >= AttrSets.size())
-    AttrSets.resize(MaxIndex + 1);
-
-  for (unsigned Index : Indices) {
-    Index = attrIdxToArrayIdx(Index);
-    AttrBuilder B(AttrSets[Index]);
-    B.addAttribute(A);
-    AttrSets[Index] = AttributeSet::get(C, B);
-  }
-
-  return getImpl(C, AttrSets);
+  AttrBuilder B;
+  B.addAttribute(A);
+  return addAttributes(C, Index, B);
 }
 
 AttributeList AttributeList::addAttributes(LLVMContext &C, unsigned Index,
@@ -1082,6 +1073,26 @@ AttributeList AttributeList::addAttributes(LLVMContext &C, unsigned Index,
   return getImpl(C, AttrSets);
 }
 
+AttributeList AttributeList::addParamAttribute(LLVMContext &C,
+                                               ArrayRef<unsigned> ArgNos,
+                                               Attribute A) const {
+  assert(std::is_sorted(ArgNos.begin(), ArgNos.end()));
+
+  SmallVector<AttributeSet, 4> AttrSets(this->begin(), this->end());
+  unsigned MaxIndex = attrIdxToArrayIdx(ArgNos.back() + FirstArgIndex);
+  if (MaxIndex >= AttrSets.size())
+    AttrSets.resize(MaxIndex + 1);
+
+  for (unsigned ArgNo : ArgNos) {
+    unsigned Index = attrIdxToArrayIdx(ArgNo + FirstArgIndex);
+    AttrBuilder B(AttrSets[Index]);
+    B.addAttribute(A);
+    AttrSets[Index] = AttributeSet::get(C, B);
+  }
+
+  return getImpl(C, AttrSets);
+}
+
 AttributeList AttributeList::removeAttribute(LLVMContext &C, unsigned Index,
                                              Attribute::AttrKind Kind) const {
   if (!hasAttribute(Index, Kind)) return *this;
-- 
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