Scalar to vector conversions using direct moves

This patch corresponds to review:
http://reviews.llvm.org/D11471

It improves the code generated for converting a scalar to a vector value. With
direct moves from GPRs to VSRs, we no longer require expensive stack operations
for this. Subsequent patches will handle the reverse case and more general
operations between vectors and their scalar elements.

llvm-svn: 244921

1 files changed, 9 insertions, 1 deletions

diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
index 6058e513fc4..503f01f0827 100644
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -542,6 +542,14 @@ PPCTargetLowering::PPCTargetLowering(const PPCTargetMachine &TM,
 
     if (Subtarget.hasVSX()) {
       setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v2f64, Legal);
+      if (Subtarget.hasP8Vector())
+        setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4f32, Legal);
+      if (Subtarget.hasDirectMove()) {
+        setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v16i8, Legal);
+        setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v8i16, Legal);
+        setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4i32, Legal);
+        setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v2i64, Legal);
+      }
       setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v2f64, Legal);
 
       setOperationAction(ISD::FFLOOR, MVT::v2f64, Legal);
@@ -11490,7 +11498,7 @@ bool
 PPCTargetLowering::shouldExpandBuildVectorWithShuffles(
                      EVT VT , unsigned DefinedValues) const {
   if (VT == MVT::v2i64)
-    return false;
+    return Subtarget.hasDirectMove(); // Don't need stack ops with direct moves
 
   if (Subtarget.hasQPX()) {
     if (VT == MVT::v4f32 || VT == MVT::v4f64 || VT == MVT::v4i1)