instcombine: Migrate fputs optimizations

This patch migrates the fputs optimizations from the simplify-libcalls
pass into the instcombine library call simplifier.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168893 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 24 insertions, 27 deletions

diff --git a/lib/Transforms/Scalar/SimplifyLibCalls.cpp b/lib/Transforms/Scalar/SimplifyLibCalls.cpp
index 7e44b03..7a22412 100644
--- a/lib/Transforms/Scalar/SimplifyLibCalls.cpp
+++ b/lib/Transforms/Scalar/SimplifyLibCalls.cpp
@@ -87,31 +87,6 @@ namespace {
 //===----------------------------------------------------------------------===//
 
 //===---------------------------------------===//
-// 'fputs' Optimizations
-
-struct FPutsOpt : public LibCallOptimization {
-  virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
-    // These optimizations require DataLayout.
-    if (!TD) return 0;
-
-    // Require two pointers.  Also, we can't optimize if return value is used.
-    FunctionType *FT = Callee->getFunctionType();
-    if (FT->getNumParams() != 2 || !FT->getParamType(0)->isPointerTy() ||
-        !FT->getParamType(1)->isPointerTy() ||
-        !CI->use_empty())
-      return 0;
-
-    // fputs(s,F) --> fwrite(s,1,strlen(s),F)
-    uint64_t Len = GetStringLength(CI->getArgOperand(0));
-    if (!Len) return 0;
-    // Known to have no uses (see above).
-    return EmitFWrite(CI->getArgOperand(0),
-                      ConstantInt::get(TD->getIntPtrType(*Context), Len-1),
-                      CI->getArgOperand(1), B, TD, TLI);
-  }
-};
-
-//===---------------------------------------===//
 // 'puts' Optimizations
 
 struct PutsOpt : public LibCallOptimization {
@@ -153,7 +128,6 @@ namespace {
 
     StringMap<LibCallOptimization*> Optimizations;
     // Formatting and IO Optimizations
-    FPutsOpt FPuts;
     PutsOpt Puts;
 
     bool Modified;  // This is only used by doInitialization.
@@ -210,7 +184,6 @@ void SimplifyLibCalls::AddOpt(LibFunc::Func F1, LibFunc::Func F2,
 /// we know.
 void SimplifyLibCalls::InitOptimizations() {
   // Formatting and IO Optimizations
-  AddOpt(LibFunc::fputs, &FPuts);
   Optimizations["puts"] = &Puts;
 }
 
diff --git a/lib/Transforms/Utils/SimplifyLibCalls.cpp b/lib/Transforms/Utils/SimplifyLibCalls.cpp
index 00a5d89..8d81ba4 100644
--- a/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ b/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -1610,6 +1610,28 @@ struct FWriteOpt : public LibCallOptimization {
   }
 };
 
+struct FPutsOpt : public LibCallOptimization {
+  virtual Value *callOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+    // These optimizations require DataLayout.
+    if (!TD) return 0;
+
+    // Require two pointers.  Also, we can't optimize if return value is used.
+    FunctionType *FT = Callee->getFunctionType();
+    if (FT->getNumParams() != 2 || !FT->getParamType(0)->isPointerTy() ||
+        !FT->getParamType(1)->isPointerTy() ||
+        !CI->use_empty())
+      return 0;
+
+    // fputs(s,F) --> fwrite(s,1,strlen(s),F)
+    uint64_t Len = GetStringLength(CI->getArgOperand(0));
+    if (!Len) return 0;
+    // Known to have no uses (see above).
+    return EmitFWrite(CI->getArgOperand(0),
+                      ConstantInt::get(TD->getIntPtrType(*Context), Len-1),
+                      CI->getArgOperand(1), B, TD, TLI);
+  }
+};
+
 } // End anonymous namespace.
 
 namespace llvm {
@@ -1668,6 +1690,7 @@ class LibCallSimplifierImpl {
   SPrintFOpt SPrintF;
   FPrintFOpt FPrintF;
   FWriteOpt FWrite;
+  FPutsOpt FPuts;
 
   void initOptimizations();
   void addOpt(LibFunc::Func F, LibCallOptimization* Opt);
@@ -1795,6 +1818,7 @@ void LibCallSimplifierImpl::initOptimizations() {
   addOpt(LibFunc::sprintf, &SPrintF);
   addOpt(LibFunc::fprintf, &FPrintF);
   addOpt(LibFunc::fwrite, &FWrite);
+  addOpt(LibFunc::fputs, &FPuts);
 }
 
 Value *LibCallSimplifierImpl::optimizeCall(CallInst *CI) {