Add CopyCost to TargetRegisterClass. This specifies the cost of copying a value
between two registers in the specific class.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42123 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Target.td b/lib/Target/Target.td
index 4e495fb..15213ce 100644
--- a/lib/Target/Target.td
+++ b/lib/Target/Target.td
@@ -104,6 +104,12 @@
//
int Alignment = alignment;
+ // CopyCost - This value is used to specify the cost of copying a value
+ // between two registers in this register class. The default value is one
+ // meaning it takes a single instruction to perform the copying. A negative
+ // value means copying is extremely expensive or impossible.
+ int CopyCost = 1;
+
// MemberList - Specify which registers are in this class. If the
// allocation_order_* method are not specified, this also defines the order of
// allocation used by the register allocator.