From eaf706bef3fba21f522e3c51f6e5f4ae224f1924 Mon Sep 17 00:00:00 2001
From: Benjamin Kramer <benny.kra@googlemail.com>
Date: Mon, 18 Feb 2013 12:09:51 +0000
Subject: [PATCH] Futureproof AttrBuild if we ever have more than 64 attr enum
 values.

Currently we're at 34. Bitset should compile into virtually the same code as
uint64_t here.

llvm-svn: 175437
---
 llvm/include/llvm/IR/Attributes.h | 10 +++++-----
 llvm/lib/IR/Attributes.cpp        | 26 ++++++++++++--------------
 2 files changed, 17 insertions(+), 19 deletions(-)

diff --git a/llvm/include/llvm/IR/Attributes.h b/llvm/include/llvm/IR/Attributes.h
index c0a34a01d003..380bc6a3e05e 100644
--- a/llvm/include/llvm/IR/Attributes.h
+++ b/llvm/include/llvm/IR/Attributes.h
@@ -19,6 +19,7 @@
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/FoldingSet.h"
 #include "llvm/Support/PointerLikeTypeTraits.h"
+#include <bitset>
 #include <cassert>
 #include <map>
 #include <string>
@@ -378,7 +379,7 @@ template<> struct DenseMapInfo<AttributeSet> {
 /// value, however, is not. So this can be used as a quick way to test for
 /// equality, presence of attributes, etc.
 class AttrBuilder {
-  uint64_t Attrs;
+  std::bitset<Attribute::EndAttrKinds> Attrs;
   std::map<std::string, std::string> TargetDepAttrs;
   uint64_t Alignment;
   uint64_t StackAlignment;
@@ -422,9 +423,8 @@ public:
 
   /// \brief Return true if the builder has the specified attribute.
   bool contains(Attribute::AttrKind A) const {
-    assert((unsigned)A < 64 && A < Attribute::EndAttrKinds &&
-           "Attribute out of range!");
-    return Attrs & (1ULL << A);
+    assert((unsigned)A < Attribute::EndAttrKinds && "Attribute out of range!");
+    return Attrs[A];
   }
 
   /// \brief Return true if the builder has the specified target-dependent
@@ -457,7 +457,7 @@ public:
 
   /// \brief Return true if the builder contains no target-independent
   /// attributes.
-  bool empty() const { return Attrs == 0; }
+  bool empty() const { return Attrs.none(); }
 
   // Iterators for target-dependent attributes.
   typedef std::pair<std::string, std::string>                td_type;
diff --git a/llvm/lib/IR/Attributes.cpp b/llvm/lib/IR/Attributes.cpp
index 77a1c82a99fa..d89ebc503a38 100644
--- a/llvm/lib/IR/Attributes.cpp
+++ b/llvm/lib/IR/Attributes.cpp
@@ -924,16 +924,15 @@ AttrBuilder::AttrBuilder(AttributeSet AS, unsigned Idx)
 }
 
 void AttrBuilder::clear() {
-  Attrs = 0;
+  Attrs.reset();
   Alignment = StackAlignment = 0;
 }
 
 AttrBuilder &AttrBuilder::addAttribute(Attribute::AttrKind Val) {
-  assert((unsigned)Val < 64 && Val < Attribute::EndAttrKinds &&
-         "Attribute out of range!");
+  assert((unsigned)Val < Attribute::EndAttrKinds && "Attribute out of range!");
   assert(Val != Attribute::Alignment && Val != Attribute::StackAlignment &&
          "Adding alignment attribute without adding alignment value!");
-  Attrs |= 1ULL << Val;
+  Attrs[Val] = true;
   return *this;
 }
 
@@ -944,7 +943,7 @@ AttrBuilder &AttrBuilder::addAttribute(Attribute Attr) {
   }
 
   Attribute::AttrKind Kind = Attr.getKindAsEnum();
-  Attrs |= 1ULL << Kind;
+  Attrs[Kind] = true;
 
   if (Kind == Attribute::Alignment)
     Alignment = Attr.getAlignment();
@@ -959,9 +958,8 @@ AttrBuilder &AttrBuilder::addAttribute(StringRef A, StringRef V) {
 }
 
 AttrBuilder &AttrBuilder::removeAttribute(Attribute::AttrKind Val) {
-  assert((unsigned)Val < 64 && Val < Attribute::EndAttrKinds &&
-         "Attribute out of range!");
-  Attrs &= ~(1ULL << Val);
+  assert((unsigned)Val < Attribute::EndAttrKinds && "Attribute out of range!");
+  Attrs[Val] = false;
 
   if (Val == Attribute::Alignment)
     Alignment = 0;
@@ -985,7 +983,7 @@ AttrBuilder &AttrBuilder::removeAttributes(AttributeSet A, uint64_t Index) {
     Attribute Attr = *I;
     if (Attr.isEnumAttribute() || Attr.isAlignAttribute()) {
       Attribute::AttrKind Kind = I->getKindAsEnum();
-      Attrs &= ~(1ULL << Kind);
+      Attrs[Kind] = false;
 
       if (Kind == Attribute::Alignment)
         Alignment = 0;
@@ -1016,7 +1014,7 @@ AttrBuilder &AttrBuilder::addAlignmentAttr(unsigned Align) {
   assert(isPowerOf2_32(Align) && "Alignment must be a power of two.");
   assert(Align <= 0x40000000 && "Alignment too large.");
 
-  Attrs |= 1ULL << Attribute::Alignment;
+  Attrs[Attribute::Alignment] = true;
   Alignment = Align;
   return *this;
 }
@@ -1028,7 +1026,7 @@ AttrBuilder &AttrBuilder::addStackAlignmentAttr(unsigned Align) {
   assert(isPowerOf2_32(Align) && "Alignment must be a power of two.");
   assert(Align <= 0x100 && "Alignment too large.");
 
-  Attrs |= 1ULL << Attribute::StackAlignment;
+  Attrs[Attribute::StackAlignment] = true;
   StackAlignment = Align;
   return *this;
 }
@@ -1055,7 +1053,7 @@ bool AttrBuilder::contains(StringRef A) const {
 }
 
 bool AttrBuilder::hasAttributes() const {
-  return Attrs != 0 || !TargetDepAttrs.empty();
+  return !Attrs.none() || !TargetDepAttrs.empty();
 }
 
 bool AttrBuilder::hasAttributes(AttributeSet A, uint64_t Index) const {
@@ -1072,7 +1070,7 @@ bool AttrBuilder::hasAttributes(AttributeSet A, uint64_t Index) const {
        I != E; ++I) {
     Attribute Attr = *I;
     if (Attr.isEnumAttribute() || Attr.isAlignAttribute()) {
-      if (Attrs & (1ULL << I->getKindAsEnum()))
+      if (Attrs[I->getKindAsEnum()])
         return true;
     } else {
       assert(Attr.isStringAttribute() && "Invalid attribute kind!");
@@ -1106,7 +1104,7 @@ AttrBuilder &AttrBuilder::addRawValue(uint64_t Val) {
   for (Attribute::AttrKind I = Attribute::None; I != Attribute::EndAttrKinds;
        I = Attribute::AttrKind(I + 1)) {
     if (uint64_t A = (Val & AttributeImpl::getAttrMask(I))) {
-      Attrs |= 1ULL << I;
+      Attrs[I] = true;
  
       if (I == Attribute::Alignment)
         Alignment = 1ULL << ((A >> 16) - 1);