[X86][AVX] Rename LowerVectorBroadcast to lowerBuildVectorAsBroadcast. NFCI.

Since the shuffle refactor, this is only used during BUILD_VECTOR lowering.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301834 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 458afc6..714256b 100644 (file)
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -6646,18 +6646,16 @@ static bool isUseOfShuffle(SDNode *N) {
   return false;
 }
 
-/// Attempt to use the vbroadcast instruction to generate a splat value for the
-/// following cases:
-/// 1. A splat BUILD_VECTOR which uses:
-///    a. A single scalar load, or a constant.
-///    b. Repeated pattern of constants (e.g. <0,1,0,1> or <0,1,2,3,0,1,2,3>).
-/// 2. A splat shuffle which uses a scalar_to_vector node which comes from
-/// a scalar load, or a constant.
+/// Attempt to use the vbroadcast instruction to generate a splat value
+/// from a splat BUILD_VECTOR which uses:
+///  a. A single scalar load, or a constant.
+///  b. Repeated pattern of constants (e.g. <0,1,0,1> or <0,1,2,3,0,1,2,3>).
 ///
 /// The VBROADCAST node is returned when a pattern is found,
 /// or SDValue() otherwise.
-static SDValue LowerVectorBroadcast(BuildVectorSDNode *BVOp, const X86Subtarget &Subtarget,
-                                    SelectionDAG &DAG) {
+static SDValue lowerBuildVectorAsBroadcast(BuildVectorSDNode *BVOp,
+                                           const X86Subtarget &Subtarget,
+                                           SelectionDAG &DAG) {
   // VBROADCAST requires AVX.
   // TODO: Splats could be generated for non-AVX CPUs using SSE
   // instructions, but there's less potential gain for only 128-bit vectors.
@@ -7610,7 +7608,7 @@ X86TargetLowering::LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) const {
     return AddSub;
   if (SDValue HorizontalOp = LowerToHorizontalOp(BV, Subtarget, DAG))
     return HorizontalOp;
-  if (SDValue Broadcast = LowerVectorBroadcast(BV, Subtarget, DAG))
+  if (SDValue Broadcast = lowerBuildVectorAsBroadcast(BV, Subtarget, DAG))
     return Broadcast;
   if (SDValue BitOp = lowerBuildVectorToBitOp(BV, DAG))
     return BitOp;
@@ -9848,7 +9846,6 @@ static SDValue lowerVectorShuffleAsTruncBroadcast(const SDLoc &DL, MVT VT,
 /// For convenience, this code also bundles all of the subtarget feature set
 /// filtering. While a little annoying to re-dispatch on type here, there isn't
 /// a convenient way to factor it out.
-/// FIXME: This is very similar to LowerVectorBroadcast - can we merge them?
 static SDValue lowerVectorShuffleAsBroadcast(const SDLoc &DL, MVT VT,
                                              SDValue V1, SDValue V2,
                                              ArrayRef<int> Mask,