[LegalizeDAG] Use APInt::getSplat helper to create bitreverse masks. NFCI.

llvm-svn: 354867

1 files changed, 6 insertions, 10 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index 0e5ba3453c1..f4dfccc9a36 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -2493,16 +2493,12 @@ SDValue SelectionDAGLegalize::ExpandBITREVERSE(SDValue Op, const SDLoc &dl) {
   // TODO: We can easily support i4/i2 legal types if any target ever does.
   if (Sz >= 8 && isPowerOf2_32(Sz)) {
     // Create the masks - repeating the pattern every byte.
-    APInt MaskHi4(Sz, 0), MaskHi2(Sz, 0), MaskHi1(Sz, 0);
-    APInt MaskLo4(Sz, 0), MaskLo2(Sz, 0), MaskLo1(Sz, 0);
-    for (unsigned J = 0; J != Sz; J += 8) {
-      MaskHi4 = MaskHi4 | (0xF0ull << J);
-      MaskLo4 = MaskLo4 | (0x0Full << J);
-      MaskHi2 = MaskHi2 | (0xCCull << J);
-      MaskLo2 = MaskLo2 | (0x33ull << J);
-      MaskHi1 = MaskHi1 | (0xAAull << J);
-      MaskLo1 = MaskLo1 | (0x55ull << J);
-    }
+    APInt MaskHi4 = APInt::getSplat(Sz, APInt(8, 0xF0));
+    APInt MaskHi2 = APInt::getSplat(Sz, APInt(8, 0xCC));
+    APInt MaskHi1 = APInt::getSplat(Sz, APInt(8, 0xAA));
+    APInt MaskLo4 = APInt::getSplat(Sz, APInt(8, 0x0F));
+    APInt MaskLo2 = APInt::getSplat(Sz, APInt(8, 0x33));
+    APInt MaskLo1 = APInt::getSplat(Sz, APInt(8, 0x55));
 
     // BSWAP if the type is wider than a single byte.
     Tmp = (Sz > 8 ? DAG.getNode(ISD::BSWAP, dl, VT, Op) : Op);