LoopVectorizer:

1. Add code to estimate register pressure.
2. Add code to select the unroll factor based on register pressure.
3. Add bits to TargetTransformInfo to provide the number of registers.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171469 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/Target/TargetTransformImpl.cpp b/lib/Target/TargetTransformImpl.cpp
index f8c588934f..7d663f57f9 100644
--- a/lib/Target/TargetTransformImpl.cpp
+++ b/lib/Target/TargetTransformImpl.cpp
@@ -171,6 +171,10 @@ VectorTargetTransformImpl::getScalarizationOverhead(Type *Ty,
   return Cost;
 }
 
+unsigned VectorTargetTransformImpl::getNumberOfRegisters(bool Vector) const {
+  return 8;
+}
+
 unsigned VectorTargetTransformImpl::getArithmeticInstrCost(unsigned Opcode,
                                                            Type *Ty) const {
   // Check if any of the operands are vector operands.