Recommit : Use the basic cost if a GEP is not used as addressing mode

Recommitting r314517 with the fix for handling ConstantExpr.

Original commit message:
  Currently, getGEPCost() returns TCC_FREE whenever a GEP is a legal addressing
  mode in the target. However, since it doesn't check its actual users, it will
  return FREE even in cases where the GEP cannot be folded away as a part of
  actual addressing mode. For example, if an user of the GEP is a call
  instruction taking the GEP as a parameter, then the GEP may not be folded in
  isel.

llvm-svn: 314923

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/Analysis/TargetTransformInfo.cpp b/llvm/lib/Analysis/TargetTransformInfo.cpp
index fad918dabb5..154021a51b9 100644
--- a/llvm/lib/Analysis/TargetTransformInfo.cpp
+++ b/llvm/lib/Analysis/TargetTransformInfo.cpp
@@ -88,6 +88,11 @@ int TargetTransformInfo::getGEPCost(Type *PointeeType, const Value *Ptr,
   return TTIImpl->getGEPCost(PointeeType, Ptr, Operands);
 }
 
+int TargetTransformInfo::getGEPCost(const GEPOperator *GEP,
+                                    ArrayRef<const Value *> Operands) const {
+  return TTIImpl->getGEPCost(GEP, Operands);
+}
+
 int TargetTransformInfo::getExtCost(const Instruction *I,
                                     const Value *Src) const {
   return TTIImpl->getExtCost(I, Src);