move isBytewiseValue out to ValueTracking.h/cpp

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122565 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 1 deletions

diff --git a/include/llvm/Analysis/ValueTracking.h b/include/llvm/Analysis/ValueTracking.h
index dcc150d18d..370282d0c0 100644
--- a/include/llvm/Analysis/ValueTracking.h
+++ b/include/llvm/Analysis/ValueTracking.h
@@ -77,7 +77,13 @@ namespace llvm {
   ///
   bool CannotBeNegativeZero(const Value *V, unsigned Depth = 0);
 
-  
+  /// isBytewiseValue - If the specified value can be set by repeating the same
+  /// byte in memory, return the i8 value that it is represented with.  This is
+  /// true for all i8 values obviously, but is also true for i32 0, i32 -1,
+  /// i16 0xF0F0, double 0.0 etc.  If the value can't be handled with a repeated
+  /// byte store (e.g. i16 0x1234), return null.
+  Value *isBytewiseValue(Value *V);
+    
   /// FindInsertedValue - Given an aggregrate and an sequence of indices, see if
   /// the scalar value indexed is already around as a register, for example if
   /// it were inserted directly into the aggregrate.