Add direct moves to/from VSR and exploit them for FP/INT conversions

This patch corresponds to review:
http://reviews.llvm.org/D8928

It adds direct move instructions to/from VSX registers to GPR's. These are
exploited for FP <-> INT conversions.

llvm-svn: 234682

1 files changed, 4 insertions, 0 deletions

diff --git a/llvm/lib/Target/PowerPC/PPCFastISel.cpp b/llvm/lib/Target/PowerPC/PPCFastISel.cpp
index 8d3f308ab96..002616babd4 100644
--- a/llvm/lib/Target/PowerPC/PPCFastISel.cpp
+++ b/llvm/lib/Target/PowerPC/PPCFastISel.cpp
@@ -958,6 +958,8 @@ unsigned PPCFastISel::PPCMoveToFPReg(MVT SrcVT, unsigned SrcReg,
 }
 
 // Attempt to fast-select an integer-to-floating-point conversion.
+// FIXME: Once fast-isel has better support for VSX, conversions using
+//        direct moves should be implemented.
 bool PPCFastISel::SelectIToFP(const Instruction *I, bool IsSigned) {
   MVT DstVT;
   Type *DstTy = I->getType();
@@ -1065,6 +1067,8 @@ unsigned PPCFastISel::PPCMoveToIntReg(const Instruction *I, MVT VT,
 }
 
 // Attempt to fast-select a floating-point-to-integer conversion.
+// FIXME: Once fast-isel has better support for VSX, conversions using
+//        direct moves should be implemented.
 bool PPCFastISel::SelectFPToI(const Instruction *I, bool IsSigned) {
   MVT DstVT, SrcVT;
   Type *DstTy = I->getType();