// Formatting and IO Optimizations
//===----------------------------------------------------------------------===//
-//===---------------------------------------===//
-// 'fwrite' Optimizations
-
-struct FWriteOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // Require a pointer, an integer, an integer, a pointer, returning integer.
- FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() != 4 || !FT->getParamType(0)->isPointerTy() ||
- !FT->getParamType(1)->isIntegerTy() ||
- !FT->getParamType(2)->isIntegerTy() ||
- !FT->getParamType(3)->isPointerTy() ||
- !FT->getReturnType()->isIntegerTy())
- return 0;
-
- // Get the element size and count.
- ConstantInt *SizeC = dyn_cast<ConstantInt>(CI->getArgOperand(1));
- ConstantInt *CountC = dyn_cast<ConstantInt>(CI->getArgOperand(2));
- if (!SizeC || !CountC) return 0;
- uint64_t Bytes = SizeC->getZExtValue()*CountC->getZExtValue();
-
- // If this is writing zero records, remove the call (it's a noop).
- if (Bytes == 0)
- return ConstantInt::get(CI->getType(), 0);
-
- // If this is writing one byte, turn it into fputc.
- // This optimisation is only valid, if the return value is unused.
- if (Bytes == 1 && CI->use_empty()) { // fwrite(S,1,1,F) -> fputc(S[0],F)
- Value *Char = B.CreateLoad(CastToCStr(CI->getArgOperand(0), B), "char");
- Value *NewCI = EmitFPutC(Char, CI->getArgOperand(3), B, TD, TLI);
- return NewCI ? ConstantInt::get(CI->getType(), 1) : 0;
- }
-
- return 0;
- }
-};
-
//===---------------------------------------===//
// 'fputs' Optimizations
StringMap<LibCallOptimization*> Optimizations;
// Formatting and IO Optimizations
- FWriteOpt FWrite; FPutsOpt FPuts;
+ FPutsOpt FPuts;
PutsOpt Puts;
bool Modified; // This is only used by doInitialization.
/// we know.
void SimplifyLibCalls::InitOptimizations() {
// Formatting and IO Optimizations
- AddOpt(LibFunc::fwrite, &FWrite);
AddOpt(LibFunc::fputs, &FPuts);
Optimizations["puts"] = &Puts;
}