[SystemZ] Use SRST to implement strlen and strnlen

It would also make sense to use it for memchr; I'm working on that now.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188547 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 14 insertions, 1 deletions

diff --git a/include/llvm/Target/TargetLibraryInfo.h b/include/llvm/Target/TargetLibraryInfo.h
index 7a06415f4b..50b16a355d 100644
--- a/include/llvm/Target/TargetLibraryInfo.h
+++ b/include/llvm/Target/TargetLibraryInfo.h
@@ -700,7 +700,7 @@ public:
     case LibFunc::log2:      case LibFunc::log2f:      case LibFunc::log2l:
     case LibFunc::exp2:      case LibFunc::exp2f:      case LibFunc::exp2l:
     case LibFunc::memcmp:    case LibFunc::strcmp:     case LibFunc::strcpy:
-    case LibFunc::stpcpy:
+    case LibFunc::stpcpy:    case LibFunc::strlen:     case LibFunc::strnlen:
       return true;
     }
     return false;
diff --git a/include/llvm/Target/TargetSelectionDAGInfo.h b/include/llvm/Target/TargetSelectionDAGInfo.h
index 5e65c304a1..138ff48196 100644
--- a/include/llvm/Target/TargetSelectionDAGInfo.h
+++ b/include/llvm/Target/TargetSelectionDAGInfo.h
@@ -137,6 +137,19 @@ public:
                           MachinePointerInfo Op2PtrInfo) const {
     return std::make_pair(SDValue(), SDValue());
   }
+
+  virtual std::pair<SDValue, SDValue>
+  EmitTargetCodeForStrlen(SelectionDAG &DAG, SDLoc DL, SDValue Chain,
+                          SDValue Src, MachinePointerInfo SrcPtrInfo) const {
+    return std::make_pair(SDValue(), SDValue());
+  }
+
+  virtual std::pair<SDValue, SDValue>
+  EmitTargetCodeForStrnlen(SelectionDAG &DAG, SDLoc DL, SDValue Chain,
+                           SDValue Src, SDValue MaxLength,
+                           MachinePointerInfo SrcPtrInfo) const {
+    return std::make_pair(SDValue(), SDValue());
+  }
 };
 
 } // end llvm namespace