[Attributes] Simplify attribute sorting (NFCI)

It's not necessary to explicitly sort by enum/int/type attribute,
as the attribute kinds are already sorted this way. We can directly
sort by kind.

1 files changed, 12 insertions, 30 deletions

diff --git a/llvm/lib/IR/Attributes.cpp b/llvm/lib/IR/Attributes.cpp
index 3c3ffea..916aa86 100644
--- a/llvm/lib/IR/Attributes.cpp
+++ b/llvm/lib/IR/Attributes.cpp
@@ -541,41 +541,23 @@ Type *AttributeImpl::getValueAsType() const {
 bool AttributeImpl::operator<(const AttributeImpl &AI) const {
   if (this == &AI)
     return false;
+
   // This sorts the attributes with Attribute::AttrKinds coming first (sorted
   // relative to their enum value) and then strings.
-  if (isEnumAttribute()) {
-    if (AI.isEnumAttribute()) return getKindAsEnum() < AI.getKindAsEnum();
-    if (AI.isIntAttribute()) return true;
-    if (AI.isStringAttribute()) return true;
-    if (AI.isTypeAttribute()) return true;
-  }
-
-  if (isTypeAttribute()) {
-    if (AI.isEnumAttribute()) return false;
-    if (AI.isTypeAttribute()) {
-      assert(getKindAsEnum() != AI.getKindAsEnum() &&
-             "Comparison of types would be unstable");
-      return getKindAsEnum() < AI.getKindAsEnum();
-    }
-    if (AI.isIntAttribute()) return true;
-    if (AI.isStringAttribute()) return true;
-  }
-
-  if (isIntAttribute()) {
-    if (AI.isEnumAttribute()) return false;
-    if (AI.isTypeAttribute()) return false;
-    if (AI.isIntAttribute()) {
-      if (getKindAsEnum() == AI.getKindAsEnum())
-        return getValueAsInt() < AI.getValueAsInt();
+  if (!isStringAttribute()) {
+    if (AI.isStringAttribute())
+      return true;
+    if (getKindAsEnum() != AI.getKindAsEnum())
       return getKindAsEnum() < AI.getKindAsEnum();
-    }
-    if (AI.isStringAttribute()) return true;
+    assert(!AI.isEnumAttribute() && "Non-unique attribute");
+    assert(!AI.isTypeAttribute() && "Comparison of types would be unstable");
+    // TODO: Is this actually needed?
+    assert(AI.isIntAttribute() && "Only possibility left");
+    return getValueAsInt() < AI.getValueAsInt();
   }
 
-  assert(isStringAttribute());
-  if (AI.isEnumAttribute()) return false;
-  if (AI.isTypeAttribute()) return false;
-  if (AI.isIntAttribute()) return false;
+  if (!AI.isStringAttribute())
+    return false;
   if (getKindAsString() == AI.getKindAsString())
     return getValueAsString() < AI.getValueAsString();
   return getKindAsString() < AI.getKindAsString();