Avoid using lossy load / stores for memcpy / memset expansion. e.g.

[oota-llvm.git] / include / llvm / Target / TargetLowering.h

diff --git a/include/llvm/Target/TargetLowering.h b/include/llvm/Target/TargetLowering.h
index faf0a0179a34e342942a512c8152f7eb911958b5..f3010438518a6fbca5aee731d4f1fda2b97e0855 100644 (file)
--- a/include/llvm/Target/TargetLowering.h
+++ b/include/llvm/Target/TargetLowering.h
@@ -716,6 +716,15 @@ public:
     return MVT::Other;
   }
 
+  /// isLegalMemOpType - Returns true if it's legal to use load / store of the
+  /// specified type to expand memcpy / memset inline. This is mostly true
+  /// for legal types except for some special cases. For example, on X86
+  /// targets without SSE2 f64 load / store are done with fldl / fstpl which
+  /// also does type conversion.
+  virtual bool isLegalMemOpType(MVT VT) const {
+    return VT.isInteger();
+  }
+
   /// usesUnderscoreSetJmp - Determine if we should use _setjmp or setjmp
   /// to implement llvm.setjmp.
   bool usesUnderscoreSetJmp() const {