Allow these transforms for types like i256 while

still excluding types like i1 (not byte sized)
and i120 (loading an i120 requires loading an i64,
an i32, an i16 and an i8, which is expensive). 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52310 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 0 deletions

diff --git a/include/llvm/CodeGen/ValueTypes.h b/include/llvm/CodeGen/ValueTypes.h
index ef70dab3fe..dd9b4ae309 100644
--- a/include/llvm/CodeGen/ValueTypes.h
+++ b/include/llvm/CodeGen/ValueTypes.h
@@ -266,6 +266,12 @@ namespace llvm {
       return (getSizeInBits() & 7) == 0;
     }
 
+    /// isRound - Return true if the size is a power-of-two number of bytes.
+    inline bool isRound() const {
+      unsigned BitSize = getSizeInBits();
+      return BitSize >= 8 && !(BitSize & (BitSize - 1));
+    }
+
     /// bitsGT - Return true if this has more bits than VT.
     inline bool bitsGT(MVT VT) const {
       return getSizeInBits() > VT.getSizeInBits();