[Hexagon] Explicitly make vector subregs have unknown size and offset

Vector length depends on the HVX mode, so make the size and offset unknown
instead using values for some specific mode.

diff --git a/llvm/lib/Target/Hexagon/HexagonRegisterInfo.td b/llvm/lib/Target/Hexagon/HexagonRegisterInfo.td
index cb5b6c6..3a77fcd 100644 (file)
--- a/llvm/lib/Target/Hexagon/HexagonRegisterInfo.td
+++ b/llvm/lib/Target/Hexagon/HexagonRegisterInfo.td
@@ -117,11 +117,11 @@ let Namespace = "Hexagon" in {
 
   def isub_lo  : SubRegIndex<32>;
   def isub_hi  : SubRegIndex<32, 32>;
-  def vsub_lo  : SubRegIndex<512>;
-  def vsub_hi  : SubRegIndex<512, 512>;
-  def vsub_fake: SubRegIndex<512>;
-  def wsub_lo  : SubRegIndex<1024>;
-  def wsub_hi  : SubRegIndex<1024, 1024>;
+  def vsub_lo  : SubRegIndex<-1, -1>;
+  def vsub_hi  : SubRegIndex<-1, -1>;
+  def vsub_fake: SubRegIndex<-1, -1>;
+  def wsub_lo  : SubRegIndex<-1, -1>;
+  def wsub_hi  : SubRegIndex<-1, -1>;
   def subreg_overflow : SubRegIndex<1, 0>;
 
   // Integer registers.