Set CCR (EFLAGS) copy cost to -1, i.e. extremely expensive to copy.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42124 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/X86RegisterInfo.td b/lib/Target/X86/X86RegisterInfo.td
index 0d20b59ee01d8cb2f755e3f075de8f4520e74d7e..d8bbbd574b4c01ee2aabe5d38b414e51b64978da 100644 (file)
--- a/lib/Target/X86/X86RegisterInfo.td
+++ b/lib/Target/X86/X86RegisterInfo.td
@@ -521,4 +521,6 @@ def VR128 : RegisterClass<"X86", [v16i8, v8i16, v4i32, v2i64, v4f32, v2f64],128,
 }
 
 // Status flags registers.
-def CCR : RegisterClass<"X86", [i32], 32, [EFLAGS]>;
+def CCR : RegisterClass<"X86", [i32], 32, [EFLAGS]> {
+  let CopyCost = -1;  // Don't allow copying of status registers.
+}