diff --git a/llvm/include/llvm/Transforms/Utils/BuildLibCalls.h b/llvm/include/llvm/Transforms/Utils/BuildLibCalls.h
--- a/llvm/include/llvm/Transforms/Utils/BuildLibCalls.h
+++ b/llvm/include/llvm/Transforms/Utils/BuildLibCalls.h
@@ -187,21 +187,11 @@
   Value *emitFPutC(Value *Char, Value *File, IRBuilderBase &B,
                    const TargetLibraryInfo *TLI);
 
-  /// Emit a call to the fputc_unlocked function. This assumes that Char is an
-  /// i32, and File is a pointer to FILE.
-  Value *emitFPutCUnlocked(Value *Char, Value *File, IRBuilderBase &B,
-                           const TargetLibraryInfo *TLI);
-
   /// Emit a call to the fputs function. Str is required to be a pointer and
   /// File is a pointer to FILE.
   Value *emitFPutS(Value *Str, Value *File, IRBuilderBase &B,
                    const TargetLibraryInfo *TLI);
 
-  /// Emit a call to the fputs_unlocked function. Str is required to be a
-  /// pointer and File is a pointer to FILE.
-  Value *emitFPutSUnlocked(Value *Str, Value *File, IRBuilderBase &B,
-                           const TargetLibraryInfo *TLI);
-
   /// Emit a call to the fwrite function. This assumes that Ptr is a pointer,
   /// Size is an 'intptr_t', and File is a pointer to FILE.
   Value *emitFWrite(Value *Ptr, Value *Size, Value *File, IRBuilderBase &B,
@@ -214,27 +204,6 @@
   /// Emit a call to the calloc function.
   Value *emitCalloc(Value *Num, Value *Size, const AttributeList &Attrs,
                     IRBuilderBase &B, const TargetLibraryInfo &TLI);
-
-  /// Emit a call to the fwrite_unlocked function. This assumes that Ptr is a
-  /// pointer, Size is an 'intptr_t', N is nmemb and File is a pointer to FILE.
-  Value *emitFWriteUnlocked(Value *Ptr, Value *Size, Value *N, Value *File,
-                            IRBuilderBase &B, const DataLayout &DL,
-                            const TargetLibraryInfo *TLI);
-
-  /// Emit a call to the fgetc_unlocked function. File is a pointer to FILE.
-  Value *emitFGetCUnlocked(Value *File, IRBuilderBase &B,
-                           const TargetLibraryInfo *TLI);
-
-  /// Emit a call to the fgets_unlocked function. Str is required to be a
-  /// pointer, Size is an i32 and File is a pointer to FILE.
-  Value *emitFGetSUnlocked(Value *Str, Value *Size, Value *File,
-                           IRBuilderBase &B, const TargetLibraryInfo *TLI);
-
-  /// Emit a call to the fread_unlocked function. This assumes that Ptr is a
-  /// pointer, Size is an 'intptr_t', N is nmemb and File is a pointer to FILE.
-  Value *emitFReadUnlocked(Value *Ptr, Value *Size, Value *N, Value *File,
-                           IRBuilderBase &B, const DataLayout &DL,
-                           const TargetLibraryInfo *TLI);
 }
 
 #endif
diff --git a/llvm/include/llvm/Transforms/Utils/SimplifyLibCalls.h b/llvm/include/llvm/Transforms/Utils/SimplifyLibCalls.h
--- a/llvm/include/llvm/Transforms/Utils/SimplifyLibCalls.h
+++ b/llvm/include/llvm/Transforms/Utils/SimplifyLibCalls.h
@@ -220,11 +220,7 @@
   Value *optimizeSnPrintF(CallInst *CI, IRBuilderBase &B);
   Value *optimizeFPrintF(CallInst *CI, IRBuilderBase &B);
   Value *optimizeFWrite(CallInst *CI, IRBuilderBase &B);
-  Value *optimizeFRead(CallInst *CI, IRBuilderBase &B);
   Value *optimizeFPuts(CallInst *CI, IRBuilderBase &B);
-  Value *optimizeFGets(CallInst *CI, IRBuilderBase &B);
-  Value *optimizeFPutc(CallInst *CI, IRBuilderBase &B);
-  Value *optimizeFGetc(CallInst *CI, IRBuilderBase &B);
   Value *optimizePuts(CallInst *CI, IRBuilderBase &B);
 
   // Helper methods
diff --git a/llvm/lib/Transforms/Utils/BuildLibCalls.cpp b/llvm/lib/Transforms/Utils/BuildLibCalls.cpp
--- a/llvm/lib/Transforms/Utils/BuildLibCalls.cpp
+++ b/llvm/lib/Transforms/Utils/BuildLibCalls.cpp
@@ -1188,26 +1188,6 @@
   return CI;
 }
 
-Value *llvm::emitFPutCUnlocked(Value *Char, Value *File, IRBuilderBase &B,
-                               const TargetLibraryInfo *TLI) {
-  if (!TLI->has(LibFunc_fputc_unlocked))
-    return nullptr;
-
-  Module *M = B.GetInsertBlock()->getModule();
-  StringRef FPutcUnlockedName = TLI->getName(LibFunc_fputc_unlocked);
-  FunctionCallee F = M->getOrInsertFunction(FPutcUnlockedName, B.getInt32Ty(),
-                                            B.getInt32Ty(), File->getType());
-  if (File->getType()->isPointerTy())
-    inferLibFuncAttributes(M, FPutcUnlockedName, *TLI);
-  Char = B.CreateIntCast(Char, B.getInt32Ty(), /*isSigned*/ true, "chari");
-  CallInst *CI = B.CreateCall(F, {Char, File}, FPutcUnlockedName);
-
-  if (const Function *Fn =
-          dyn_cast<Function>(F.getCallee()->stripPointerCasts()))
-    CI->setCallingConv(Fn->getCallingConv());
-  return CI;
-}
-
 Value *llvm::emitFPutS(Value *Str, Value *File, IRBuilderBase &B,
                        const TargetLibraryInfo *TLI) {
   if (!TLI->has(LibFunc_fputs))
@@ -1227,25 +1207,6 @@
   return CI;
 }
 
-Value *llvm::emitFPutSUnlocked(Value *Str, Value *File, IRBuilderBase &B,
-                               const TargetLibraryInfo *TLI) {
-  if (!TLI->has(LibFunc_fputs_unlocked))
-    return nullptr;
-
-  Module *M = B.GetInsertBlock()->getModule();
-  StringRef FPutsUnlockedName = TLI->getName(LibFunc_fputs_unlocked);
-  FunctionCallee F = M->getOrInsertFunction(FPutsUnlockedName, B.getInt32Ty(),
-                                            B.getInt8PtrTy(), File->getType());
-  if (File->getType()->isPointerTy())
-    inferLibFuncAttributes(M, FPutsUnlockedName, *TLI);
-  CallInst *CI = B.CreateCall(F, {castToCStr(Str, B), File}, FPutsUnlockedName);
-
-  if (const Function *Fn =
-          dyn_cast<Function>(F.getCallee()->stripPointerCasts()))
-    CI->setCallingConv(Fn->getCallingConv());
-  return CI;
-}
-
 Value *llvm::emitFWrite(Value *Ptr, Value *Size, Value *File, IRBuilderBase &B,
                         const DataLayout &DL, const TargetLibraryInfo *TLI) {
   if (!TLI->has(LibFunc_fwrite))
@@ -1310,88 +1271,3 @@
 
   return CI;
 }
-
-Value *llvm::emitFWriteUnlocked(Value *Ptr, Value *Size, Value *N, Value *File,
-                                IRBuilderBase &B, const DataLayout &DL,
-                                const TargetLibraryInfo *TLI) {
-  if (!TLI->has(LibFunc_fwrite_unlocked))
-    return nullptr;
-
-  Module *M = B.GetInsertBlock()->getModule();
-  LLVMContext &Context = B.GetInsertBlock()->getContext();
-  StringRef FWriteUnlockedName = TLI->getName(LibFunc_fwrite_unlocked);
-  FunctionCallee F = M->getOrInsertFunction(
-      FWriteUnlockedName, DL.getIntPtrType(Context), B.getInt8PtrTy(),
-      DL.getIntPtrType(Context), DL.getIntPtrType(Context), File->getType());
-
-  if (File->getType()->isPointerTy())
-    inferLibFuncAttributes(M, FWriteUnlockedName, *TLI);
-  CallInst *CI = B.CreateCall(F, {castToCStr(Ptr, B), Size, N, File});
-
-  if (const Function *Fn =
-          dyn_cast<Function>(F.getCallee()->stripPointerCasts()))
-    CI->setCallingConv(Fn->getCallingConv());
-  return CI;
-}
-
-Value *llvm::emitFGetCUnlocked(Value *File, IRBuilderBase &B,
-                               const TargetLibraryInfo *TLI) {
-  if (!TLI->has(LibFunc_fgetc_unlocked))
-    return nullptr;
-
-  Module *M = B.GetInsertBlock()->getModule();
-  StringRef FGetCUnlockedName = TLI->getName(LibFunc_fgetc_unlocked);
-  FunctionCallee F = M->getOrInsertFunction(FGetCUnlockedName, B.getInt32Ty(),
-                                            File->getType());
-  if (File->getType()->isPointerTy())
-    inferLibFuncAttributes(M, FGetCUnlockedName, *TLI);
-  CallInst *CI = B.CreateCall(F, File, FGetCUnlockedName);
-
-  if (const Function *Fn =
-          dyn_cast<Function>(F.getCallee()->stripPointerCasts()))
-    CI->setCallingConv(Fn->getCallingConv());
-  return CI;
-}
-
-Value *llvm::emitFGetSUnlocked(Value *Str, Value *Size, Value *File,
-                               IRBuilderBase &B, const TargetLibraryInfo *TLI) {
-  if (!TLI->has(LibFunc_fgets_unlocked))
-    return nullptr;
-
-  Module *M = B.GetInsertBlock()->getModule();
-  StringRef FGetSUnlockedName = TLI->getName(LibFunc_fgets_unlocked);
-  FunctionCallee F =
-      M->getOrInsertFunction(FGetSUnlockedName, B.getInt8PtrTy(),
-                             B.getInt8PtrTy(), B.getInt32Ty(), File->getType());
-  inferLibFuncAttributes(M, FGetSUnlockedName, *TLI);
-  CallInst *CI =
-      B.CreateCall(F, {castToCStr(Str, B), Size, File}, FGetSUnlockedName);
-
-  if (const Function *Fn =
-          dyn_cast<Function>(F.getCallee()->stripPointerCasts()))
-    CI->setCallingConv(Fn->getCallingConv());
-  return CI;
-}
-
-Value *llvm::emitFReadUnlocked(Value *Ptr, Value *Size, Value *N, Value *File,
-                               IRBuilderBase &B, const DataLayout &DL,
-                               const TargetLibraryInfo *TLI) {
-  if (!TLI->has(LibFunc_fread_unlocked))
-    return nullptr;
-
-  Module *M = B.GetInsertBlock()->getModule();
-  LLVMContext &Context = B.GetInsertBlock()->getContext();
-  StringRef FReadUnlockedName = TLI->getName(LibFunc_fread_unlocked);
-  FunctionCallee F = M->getOrInsertFunction(
-      FReadUnlockedName, DL.getIntPtrType(Context), B.getInt8PtrTy(),
-      DL.getIntPtrType(Context), DL.getIntPtrType(Context), File->getType());
-
-  if (File->getType()->isPointerTy())
-    inferLibFuncAttributes(M, FReadUnlockedName, *TLI);
-  CallInst *CI = B.CreateCall(F, {castToCStr(Ptr, B), Size, N, File});
-
-  if (const Function *Fn =
-          dyn_cast<Function>(F.getCallee()->stripPointerCasts()))
-    CI->setCallingConv(Fn->getCallingConv());
-  return CI;
-}
diff --git a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
--- a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -138,28 +138,6 @@
   return ConstantInt::get(CI->getType(), Result);
 }
 
-static bool isLocallyOpenedFile(Value *File, CallInst *CI,
-                                const TargetLibraryInfo *TLI) {
-  CallInst *FOpen = dyn_cast<CallInst>(File);
-  if (!FOpen)
-    return false;
-
-  Function *InnerCallee = FOpen->getCalledFunction();
-  if (!InnerCallee)
-    return false;
-
-  LibFunc Func;
-  if (!TLI->getLibFunc(*InnerCallee, Func) || !TLI->has(Func) ||
-      Func != LibFunc_fopen)
-    return false;
-
-  inferLibFuncAttributes(*CI->getCalledFunction(), *TLI);
-  if (PointerMayBeCaptured(File, true, true))
-    return false;
-
-  return true;
-}
-
 static bool isOnlyUsedInComparisonWithZero(Value *V) {
   for (User *U : V->users()) {
     if (ICmpInst *IC = dyn_cast<ICmpInst>(U))
@@ -2754,11 +2732,6 @@
     }
   }
 
-  if (isLocallyOpenedFile(CI->getArgOperand(3), CI, TLI))
-    return emitFWriteUnlocked(CI->getArgOperand(0), CI->getArgOperand(1),
-                              CI->getArgOperand(2), CI->getArgOperand(3), B, DL,
-                              TLI);
-
   return nullptr;
 }
 
@@ -2773,15 +2746,9 @@
   if (OptForSize)
     return nullptr;
 
-  // Check if has any use
-  if (!CI->use_empty()) {
-    if (isLocallyOpenedFile(CI->getArgOperand(1), CI, TLI))
-      return emitFPutSUnlocked(CI->getArgOperand(0), CI->getArgOperand(1), B,
-                               TLI);
-    else
-      // We can't optimize if return value is used.
-      return nullptr;
-  }
+  // We can't optimize if return value is used.
+  if (!CI->use_empty())
+    return nullptr;
 
   // fputs(s,F) --> fwrite(s,strlen(s),1,F)
   uint64_t Len = GetStringLength(CI->getArgOperand(0));
@@ -2795,40 +2762,6 @@
       CI->getArgOperand(1), B, DL, TLI);
 }
 
-Value *LibCallSimplifier::optimizeFPutc(CallInst *CI, IRBuilderBase &B) {
-  optimizeErrorReporting(CI, B, 1);
-
-  if (isLocallyOpenedFile(CI->getArgOperand(1), CI, TLI))
-    return emitFPutCUnlocked(CI->getArgOperand(0), CI->getArgOperand(1), B,
-                             TLI);
-
-  return nullptr;
-}
-
-Value *LibCallSimplifier::optimizeFGetc(CallInst *CI, IRBuilderBase &B) {
-  if (isLocallyOpenedFile(CI->getArgOperand(0), CI, TLI))
-    return emitFGetCUnlocked(CI->getArgOperand(0), B, TLI);
-
-  return nullptr;
-}
-
-Value *LibCallSimplifier::optimizeFGets(CallInst *CI, IRBuilderBase &B) {
-  if (isLocallyOpenedFile(CI->getArgOperand(2), CI, TLI))
-    return emitFGetSUnlocked(CI->getArgOperand(0), CI->getArgOperand(1),
-                             CI->getArgOperand(2), B, TLI);
-
-  return nullptr;
-}
-
-Value *LibCallSimplifier::optimizeFRead(CallInst *CI, IRBuilderBase &B) {
-  if (isLocallyOpenedFile(CI->getArgOperand(3), CI, TLI))
-    return emitFReadUnlocked(CI->getArgOperand(0), CI->getArgOperand(1),
-                             CI->getArgOperand(2), CI->getArgOperand(3), B, DL,
-                             TLI);
-
-  return nullptr;
-}
-
 Value *LibCallSimplifier::optimizePuts(CallInst *CI, IRBuilderBase &B) {
   annotateNonNullBasedOnAccess(CI, 0);
   if (!CI->use_empty())
@@ -3162,16 +3095,8 @@
       return optimizeFPrintF(CI, Builder);
     case LibFunc_fwrite:
       return optimizeFWrite(CI, Builder);
-    case LibFunc_fread:
-      return optimizeFRead(CI, Builder);
     case LibFunc_fputs:
       return optimizeFPuts(CI, Builder);
-    case LibFunc_fgets:
-      return optimizeFGets(CI, Builder);
-    case LibFunc_fputc:
-      return optimizeFPutc(CI, Builder);
-    case LibFunc_fgetc:
-      return optimizeFGetc(CI, Builder);
     case LibFunc_puts:
       return optimizePuts(CI, Builder);
     case LibFunc_perror:
diff --git a/llvm/test/Transforms/InstCombine/unlocked-stdio-mingw.ll b/llvm/test/Transforms/InstCombine/unlocked-stdio-mingw.ll
deleted file mode 100644
--- a/llvm/test/Transforms/InstCombine/unlocked-stdio-mingw.ll
+++ /dev/null
@@ -1,23 +0,0 @@
-; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
-; RUN: opt < %s -instcombine -S -mtriple=x86_64-w64-mingw32 | FileCheck %s
-
-%struct._iobuf = type { i8*, i32, i8*, i32, i32, i32, i32, i8* }
-
-@.str = private unnamed_addr constant [5 x i8] c"file\00", align 1
-@.str.1 = private unnamed_addr constant [2 x i8] c"w\00", align 1
-
-; Check that this still uses the plain fputc instead of fputc_unlocked
-; for MinGW targets.
-define void @external_fputc_test() {
-; CHECK-LABEL: @external_fputc_test(
-; CHECK-NEXT:    [[CALL:%.*]] = call %struct._iobuf* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
-; CHECK-NEXT:    [[CALL1:%.*]] = call i32 @fputc(i32 99, %struct._iobuf* [[CALL]])
-; CHECK-NEXT:    ret void
-;
-  %call = call %struct._iobuf* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
-  %call1 = call i32 @fputc(i32 99, %struct._iobuf* %call)
-  ret void
-}
-
-declare %struct._iobuf* @fopen(i8*, i8*)
-declare i32 @fputc(i32, %struct._iobuf* nocapture)
diff --git a/llvm/test/Transforms/InstCombine/unlocked-stdio.ll b/llvm/test/Transforms/InstCombine/unlocked-stdio.ll
deleted file mode 100644
--- a/llvm/test/Transforms/InstCombine/unlocked-stdio.ll
+++ /dev/null
@@ -1,224 +0,0 @@
-; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
-; RUN: opt < %s -instcombine -S -mtriple=x86_64-unknown-linux-gnu | FileCheck %s
-
-%struct._IO_FILE = type { i32, i8*, i8*, i8*, i8*, i8*, i8*, i8*, i8*, i8*, i8*, i8*, %struct._IO_marker*, %struct._IO_FILE*, i32, i32, i64, i16, i8, [1 x i8], i8*, i64, i8*, i8*, i8*, i8*, i64, i32, [20 x i8] }
-%struct._IO_marker = type { %struct._IO_marker*, %struct._IO_FILE*, i32 }
-
-@.str = private unnamed_addr constant [5 x i8] c"file\00", align 1
-@.str.1 = private unnamed_addr constant [2 x i8] c"w\00", align 1
-@.str.2 = private unnamed_addr constant [4 x i8] c"str\00", align 1
-@stdout = external global %struct._IO_FILE*, align 8
-@global_file = common global %struct._IO_FILE* null, align 8
-
-define void @external_fgetc_test(%struct._IO_FILE* %f) {
-; CHECK-LABEL: @external_fgetc_test(
-; CHECK-NEXT:    [[CALL:%.*]] = call i32 @fgetc(%struct._IO_FILE* [[F:%.*]])
-; CHECK-NEXT:    ret void
-;
-  %call = call i32 @fgetc(%struct._IO_FILE* %f)
-  ret void
-}
-
-declare i32 @fgetc(%struct._IO_FILE* nocapture) #0
-
-define void @external_fgetc_test2() {
-; CHECK-LABEL: @external_fgetc_test2(
-; CHECK-NEXT:    [[CALL:%.*]] = call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
-; CHECK-NEXT:    [[FPUTC_UNLOCKED:%.*]] = call i32 @fputc_unlocked(i32 99, %struct._IO_FILE* [[CALL]])
-; CHECK-NEXT:    ret void
-;
-  %call = call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
-  %call1 = call i32 @fputc(i32 99, %struct._IO_FILE* %call)
-  ret void
-}
-
-declare %struct._IO_FILE* @fopen(i8*, i8*)
-declare i32 @fputc(i32, %struct._IO_FILE* nocapture) #0
-
-define internal void @fgetc_test() {
-; CHECK-LABEL: @fgetc_test(
-; CHECK-NEXT:    [[CALL:%.*]] = call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
-; CHECK-NEXT:    [[FGETC_UNLOCKED:%.*]] = call i32 @fgetc_unlocked(%struct._IO_FILE* [[CALL]])
-; CHECK-NEXT:    ret void
-;
-  %call = call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
-  %call1 = call i32 @fgetc(%struct._IO_FILE* %call)
-  ret void
-}
-
-define void @external_fgetc_internal_test() {
-; CHECK-LABEL: @external_fgetc_internal_test(
-; CHECK-NEXT:    call void @fgetc_test()
-; CHECK-NEXT:    ret void
-;
-  call void @fgetc_test()
-  ret void
-}
-
-define internal void @fwrite_test() {
-; CHECK-LABEL: @fwrite_test(
-; CHECK-NEXT:    [[S:%.*]] = alloca [10 x i8], align 1
-; CHECK-NEXT:    [[CALL:%.*]] = call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
-; CHECK-NEXT:    [[ARRAYDECAY:%.*]] = getelementptr inbounds [10 x i8], [10 x i8]* [[S]], i64 0, i64 0
-; CHECK-NEXT:    [[TMP1:%.*]] = call i64 @fwrite_unlocked(i8* nonnull [[ARRAYDECAY]], i64 10, i64 10, %struct._IO_FILE* [[CALL]])
-; CHECK-NEXT:    ret void
-;
-  %s = alloca [10 x i8], align 1
-  %call = call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
-  %arraydecay = getelementptr inbounds [10 x i8], [10 x i8]* %s, i64 0, i64 0
-  %call1 = call i64 @fwrite(i8* nonnull %arraydecay, i64 10, i64 10, %struct._IO_FILE* %call)
-  ret void
-}
-
-define internal void @fread_test() {
-; CHECK-LABEL: @fread_test(
-; CHECK-NEXT:    [[S:%.*]] = alloca [10 x i8], align 1
-; CHECK-NEXT:    [[CALL:%.*]] = call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
-; CHECK-NEXT:    [[ARRAYDECAY:%.*]] = getelementptr inbounds [10 x i8], [10 x i8]* [[S]], i64 0, i64 0
-; CHECK-NEXT:    [[TMP1:%.*]] = call i64 @fread_unlocked(i8* nonnull [[ARRAYDECAY]], i64 10, i64 10, %struct._IO_FILE* [[CALL]])
-; CHECK-NEXT:    ret void
-;
-  %s = alloca [10 x i8], align 1
-  %call = call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
-  %arraydecay = getelementptr inbounds [10 x i8], [10 x i8]* %s, i64 0, i64 0
-  %call1 = call i64 @fread(i8* nonnull %arraydecay, i64 10, i64 10, %struct._IO_FILE* %call)
-  ret void
-}
-
-define internal void @fputs_test() {
-; CHECK-LABEL: @fputs_test(
-; CHECK-NEXT:    [[CALL:%.*]] = call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
-; CHECK-NEXT:    [[TMP1:%.*]] = call i64 @fwrite_unlocked(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i64 3, i64 1, %struct._IO_FILE* [[CALL]])
-; CHECK-NEXT:    ret void
-;
-  %call = call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
-  %call1 = call i32 @fputs(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), %struct._IO_FILE* %call)
-  ret void
-}
-
-define internal void @fgets_test() {
-; CHECK-LABEL: @fgets_test(
-; CHECK-NEXT:    [[BUF:%.*]] = alloca [10 x i8], align 1
-; CHECK-NEXT:    [[CALL:%.*]] = call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
-; CHECK-NEXT:    [[ARRAYDECAY:%.*]] = getelementptr inbounds [10 x i8], [10 x i8]* [[BUF]], i64 0, i64 0
-; CHECK-NEXT:    [[FGETS_UNLOCKED:%.*]] = call i8* @fgets_unlocked(i8* nonnull [[ARRAYDECAY]], i32 10, %struct._IO_FILE* [[CALL]])
-; CHECK-NEXT:    ret void
-;
-  %buf = alloca [10 x i8], align 1
-  %call = call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
-  %arraydecay = getelementptr inbounds [10 x i8], [10 x i8]* %buf, i64 0, i64 0
-  %call1 = call i8* @fgets(i8* nonnull %arraydecay, i32 10, %struct._IO_FILE* %call)
-  ret void
-}
-
-define internal void @fputc_test() {
-; CHECK-LABEL: @fputc_test(
-; CHECK-NEXT:    [[CALL:%.*]] = call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
-; CHECK-NEXT:    [[FPUTC_UNLOCKED:%.*]] = call i32 @fputc_unlocked(i32 99, %struct._IO_FILE* [[CALL]])
-; CHECK-NEXT:    ret void
-;
-  %call = call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
-  %call1 = call i32 @fputc(i32 99, %struct._IO_FILE* %call)
-  ret void
-}
-
-define i32 @main() {
-; CHECK-LABEL: @main(
-; CHECK-NEXT:    call void @fwrite_test()
-; CHECK-NEXT:    call void @fread_test()
-; CHECK-NEXT:    call void @fputs_test()
-; CHECK-NEXT:    call void @fgets_test()
-; CHECK-NEXT:    call void @fputc_test()
-; CHECK-NEXT:    call void @fgetc_test()
-; CHECK-NEXT:    ret i32 0
-;
-  call void @fwrite_test()
-  call void @fread_test()
-  call void @fputs_test()
-  call void @fgets_test()
-  call void @fputc_test()
-  call void @fgetc_test()
-  ret i32 0
-}
-
-declare i32 @fclose(%struct._IO_FILE* nocapture)
-
-define void @test_with_fclose() {
-; CHECK-LABEL: @test_with_fclose(
-; CHECK-NEXT:    [[CALL:%.*]] = call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
-; CHECK-NEXT:    [[TMP1:%.*]] = call i64 @fwrite_unlocked(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i64 3, i64 1, %struct._IO_FILE* [[CALL]])
-; CHECK-NEXT:    [[CALL2:%.*]] = call i32 @fclose(%struct._IO_FILE* [[CALL]])
-; CHECK-NEXT:    ret void
-;
-  %call = call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0)) #2
-  %call1 = call i64 @fwrite(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i64 3, i64 1, %struct._IO_FILE* %call)
-  %call2 = call i32 @fclose(%struct._IO_FILE* %call) #2
-  ret void
-}
-
-declare void @modify_file(%struct._IO_FILE*)
-
-define void @test_captured_by_function(){
-; CHECK-LABEL: @test_captured_by_function(
-; CHECK-NEXT:    [[CALL:%.*]] = call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
-; CHECK-NEXT:    call void @modify_file(%struct._IO_FILE* [[CALL]])
-; CHECK-NEXT:    [[CALL1:%.*]] = call i64 @fwrite(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i64 3, i64 1, %struct._IO_FILE* [[CALL]])
-; CHECK-NEXT:    [[CALL2:%.*]] = call i32 @fclose(%struct._IO_FILE* [[CALL]])
-; CHECK-NEXT:    ret void
-;
-  %call = call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0)) #2
-  call void @modify_file(%struct._IO_FILE* %call) #2
-  %call1 = call i64 @fwrite(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i64 3, i64 1, %struct._IO_FILE* %call)
-  %call2 = call i32 @fclose(%struct._IO_FILE* %call) #2
-  ret void
-}
-
-define void @test_captured_by_global_value() {
-; CHECK-LABEL: @test_captured_by_global_value(
-; CHECK-NEXT:    [[CALL:%.*]] = call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
-; CHECK-NEXT:    [[DOTCAST:%.*]] = ptrtoint %struct._IO_FILE* [[CALL]] to i64
-; CHECK-NEXT:    store i64 [[DOTCAST]], i64* bitcast (%struct._IO_FILE** @global_file to i64*), align 8
-; CHECK-NEXT:    [[CALL1:%.*]] = call i64 @fwrite(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i64 3, i64 1, %struct._IO_FILE* [[CALL]])
-; CHECK-NEXT:    [[CALL2:%.*]] = call i32 @fclose(%struct._IO_FILE* [[CALL]])
-; CHECK-NEXT:    ret void
-;
-  %call = call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0)) #2
-  %.cast = ptrtoint %struct._IO_FILE* %call to i64
-  store i64 %.cast, i64* bitcast (%struct._IO_FILE** @global_file to i64*), align 8
-  %call1 = call i64 @fwrite(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i64 3, i64 1, %struct._IO_FILE* %call)
-  %call2 = call i32 @fclose(%struct._IO_FILE* %call) #2
-  ret void
-}
-
-define void @test_captured_by_standard_stream(i8* nocapture readonly %s) {
-; CHECK-LABEL: @test_captured_by_standard_stream(
-; CHECK-NEXT:    [[CALL:%.*]] = tail call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
-; CHECK-NEXT:    [[TMP:%.*]] = load %struct._IO_FILE*, %struct._IO_FILE** @stdout, align 8
-; CHECK-NEXT:    [[CALL1:%.*]] = tail call i32 @fputs(i8* [[S:%.*]], %struct._IO_FILE* [[TMP]])
-; CHECK-NEXT:    [[CALL2:%.*]] = tail call i32 @fclose(%struct._IO_FILE* [[TMP]])
-; CHECK-NEXT:    ret void
-;
-  %call = tail call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
-  %tmp = load %struct._IO_FILE*, %struct._IO_FILE** @stdout, align 8
-  %call1 = tail call i32 @fputs(i8* %s, %struct._IO_FILE* %tmp)
-  %call2 = tail call i32 @fclose(%struct._IO_FILE* %tmp)
-  ret void
-}
-
-define void @test_captured_by_arg(i8* nocapture readonly %s, %struct._IO_FILE* nocapture %file) {
-; CHECK-LABEL: @test_captured_by_arg(
-; CHECK-NEXT:    [[CALL:%.*]] = tail call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
-; CHECK-NEXT:    [[CALL1:%.*]] = tail call i32 @fputs(i8* [[S:%.*]], %struct._IO_FILE* [[FILE:%.*]])
-; CHECK-NEXT:    [[CALL2:%.*]] = tail call i32 @fclose(%struct._IO_FILE* [[FILE]])
-; CHECK-NEXT:    ret void
-;
-  %call = tail call %struct._IO_FILE* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
-  %call1 = tail call i32 @fputs(i8* %s, %struct._IO_FILE* %file)
-  %call2 = tail call i32 @fclose(%struct._IO_FILE* %file)
-  ret void
-}
-
-declare i64 @fwrite(i8* nocapture, i64, i64, %struct._IO_FILE* nocapture)
-declare i64 @fread(i8* nocapture, i64, i64, %struct._IO_FILE* nocapture)
-declare i32 @fputs(i8* nocapture readonly, %struct._IO_FILE* nocapture)
-declare i8* @fgets(i8*, i32, %struct._IO_FILE* nocapture)