[PATCH] R600/SI: Add exec_lo and exec_hi subregisters.

[Matt Arsenault]

This allows accessing an SReg subregister with a normal sub register index, instead of getting a machine verifier error.

http://reviews.llvm.org/D4760

Files:
  lib/Target/R600/SIRegisterInfo.td

Index: lib/Target/R600/SIRegisterInfo.td
===================================================================
--- lib/Target/R600/SIRegisterInfo.td
+++ lib/Target/R600/SIRegisterInfo.td
@@ -27,7 +27,15 @@
   let HWEncoding = 106;
 }
 
-def EXEC : SIReg<"EXEC", 126>;
+def EXEC_LO : SIReg<"EXEC", 126>;
+def EXEC_HI : SIReg<"EXEC", 127>;
+
+def EXEC : RegisterWithSubRegs<"EXEC", [EXEC_LO, EXEC_HI]> {
+  let Namespace = "AMDGPU";
+  let SubRegIndices = [sub0, sub1];
+  let HWEncoding = 126;
+}
+
 def SCC : SIReg<"SCC", 253>;
 def M0 : SIReg <"M0", 124>;
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