[SimplifyLibcalls] [NFC] Cleanup, improvements

[xbolva00]

Summary

• Use "find('%')" instead of loop to find '%' char (we already uses find('%') in optimizePrintFString..)
• Convert getParent() chains to getModule()/getFunction()

[xbolva00]

Is it ok?

[spatel]

LGTM.

llvm/trunk/lib/Transforms/Utils/SimplifyLibCalls.cpp

Value *LibCallSimplifier::optimizeStringLength(CallInst *CI, IRBuilder<> &B,
   return nullptr;
 }
 
 Value *LibCallSimplifier::optimizeStrLen(CallInst *CI, IRBuilder<> &B) {
   return optimizeStringLength(CI, B, 8);
 }
 
 Value *LibCallSimplifier::optimizeWcslen(CallInst *CI, IRBuilder<> &B) {
-  Module &M = *CI->getParent()->getParent()->getParent();
+  Module &M = *CI->getModule();
   unsigned WCharSize = TLI->getWCharSize(M) * 8;
   // We cannot perform this optimization without wchar_size metadata.
   if (WCharSize == 0)
     return nullptr;
 
   return optimizeStringLength(CI, B, WCharSize);
 }
 
Value *LibCallSimplifier::optimizeSPrintFString(CallInst *CI, IRBuilder<> &B) {
   StringRef FormatStr;
   if (!getConstantStringInfo(CI->getArgOperand(1), FormatStr))
     return nullptr;
 
   // If we just have a format string (nothing else crazy) transform it.
   if (CI->getNumArgOperands() == 2) {
     // Make sure there's no % in the constant array.  We could try to handle
     // %% -> % in the future if we cared.
-    for (unsigned i = 0, e = FormatStr.size(); i != e; ++i)
-      if (FormatStr[i] == '%')
-        return nullptr; // we found a format specifier, bail out.
+    if (FormatStr.find('%') != StringRef::npos)
 
     // sprintf(str, fmt) -> llvm.memcpy(align 1 str, align 1 fmt, strlen(fmt)+1)
     B.CreateMemCpy(CI->getArgOperand(0), 1, CI->getArgOperand(1), 1,
                    ConstantInt::get(DL.getIntPtrType(CI->getContext()),
                                     FormatStr.size() + 1)); // Copy the null byte.
     return ConstantInt::get(CI->getType(), FormatStr.size());
   }
 
if (!Size)
     return nullptr;
 
   uint64_t N = Size->getZExtValue();
 
   // If we just have a format string (nothing else crazy) transform it.
   if (CI->getNumArgOperands() == 3) {
     // Make sure there's no % in the constant array.  We could try to handle
     // %% -> % in the future if we cared.
-    for (unsigned i = 0, e = FormatStr.size(); i != e; ++i)
-      if (FormatStr[i] == '%')
-        return nullptr; // we found a format specifier, bail out.
+    if (FormatStr.find('%') != StringRef::npos)
 
     if (N == 0)
       return ConstantInt::get(CI->getType(), FormatStr.size());
     else if (N < FormatStr.size() + 1)
       return nullptr;
 
     // sprintf(str, size, fmt) -> llvm.memcpy(align 1 str, align 1 fmt,
     // strlen(fmt)+1)
Value *LibCallSimplifier::optimizeFPrintFString(CallInst *CI, IRBuilder<> &B) {
   // Do not do any of the following transformations if the fprintf return
   // value is used, in general the fprintf return value is not compatible
   // with fwrite(), fputc() or fputs().
   if (!CI->use_empty())
     return nullptr;
 
   // fprintf(F, "foo") --> fwrite("foo", 3, 1, F)
   if (CI->getNumArgOperands() == 2) {
-    for (unsigned i = 0, e = FormatStr.size(); i != e; ++i)
-      if (FormatStr[i] == '%') // Could handle %% -> % if we cared.
-        return nullptr;        // We found a format specifier.
+    // Could handle %% -> % if we cared.
+    if (FormatStr.find('%') != StringRef::npos)
+      return nullptr; // We found a format specifier.
 
     return emitFWrite(
         CI->getArgOperand(1),
         ConstantInt::get(DL.getIntPtrType(CI->getContext()), FormatStr.size()),
         CI->getArgOperand(0), B, DL, TLI);
   }
 
   // The remaining optimizations require the format string to be "%s" or "%c"
Value *LibCallSimplifier::optimizeFWrite(CallInst *CI, IRBuilder<> &B) {
   return nullptr;
 }
 
 Value *LibCallSimplifier::optimizeFPuts(CallInst *CI, IRBuilder<> &B) {
   optimizeErrorReporting(CI, B, 1);
 
   // Don't rewrite fputs to fwrite when optimising for size because fwrite
   // requires more arguments and thus extra MOVs are required.
-  if (CI->getParent()->getParent()->optForSize())
+  if (CI->getFunction()->optForSize())
     return nullptr;
 
   // Check if has any use
   if (!CI->use_empty()) {
     if (isLocallyOpenedFile(CI->getArgOperand(1), CI, B, TLI))
       return emitFPutSUnlocked(CI->getArgOperand(0), CI->getArgOperand(1), B,
                                TLI);
     else