forked from OSchip/llvm-project
Optimize fprintf -> iprintf if there are no floating point arguments
and siprintf is available on the target. llvm-svn: 126940
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348823aa36
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af52c52569
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@ -32,6 +32,9 @@ namespace llvm {
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/// int siprintf(char *str, const char *format, ...);
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siprintf,
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/// int fiprintf(FILE *stream, const char *format, ...);
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fiprintf,
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NumLibFuncs
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};
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}
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@ -35,6 +35,7 @@ static void initialize(TargetLibraryInfo &TLI, const Triple &T) {
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if (T.getArch() != Triple::xcore) {
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TLI.setUnavailable(LibFunc::iprintf);
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TLI.setUnavailable(LibFunc::siprintf);
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TLI.setUnavailable(LibFunc::fiprintf);
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}
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}
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@ -1330,14 +1330,8 @@ struct FPutsOpt : public LibCallOptimization {
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// 'fprintf' Optimizations
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struct FPrintFOpt : public LibCallOptimization {
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virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
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// Require two fixed paramters as pointers and integer result.
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const FunctionType *FT = Callee->getFunctionType();
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if (FT->getNumParams() != 2 || !FT->getParamType(0)->isPointerTy() ||
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!FT->getParamType(1)->isPointerTy() ||
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!FT->getReturnType()->isIntegerTy())
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return 0;
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Value *OptimizeFixedFormatString(Function *Callee, CallInst *CI,
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IRBuilder<> &B) {
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// All the optimizations depend on the format string.
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std::string FormatStr;
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if (!GetConstantStringInfo(CI->getArgOperand(1), FormatStr))
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@ -1382,6 +1376,32 @@ struct FPrintFOpt : public LibCallOptimization {
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}
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return 0;
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}
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virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
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// Require two fixed paramters as pointers and integer result.
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const FunctionType *FT = Callee->getFunctionType();
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if (FT->getNumParams() != 2 || !FT->getParamType(0)->isPointerTy() ||
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!FT->getParamType(1)->isPointerTy() ||
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!FT->getReturnType()->isIntegerTy())
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return 0;
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if (Value *V = OptimizeFixedFormatString(Callee, CI, B)) {
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return V;
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}
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// fprintf(stream, format, ...) -> fiprintf(stream, format, ...) if no
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// floating point arguments.
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if (TLI->has(LibFunc::fiprintf) && !CallHasFloatingPointArgument(CI)) {
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Module *M = B.GetInsertBlock()->getParent()->getParent();
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Constant *FIPrintFFn =
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M->getOrInsertFunction("fiprintf", FT, Callee->getAttributes());
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CallInst *New = cast<CallInst>(CI->clone());
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New->setCalledFunction(FIPrintFFn);
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B.Insert(New);
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return New;
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}
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return 0;
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}
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};
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//===---------------------------------------===//
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@ -46,5 +46,26 @@ entry:
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ret i32 %0
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}
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; Verify fprintf with no floating point arguments is transformed to fiprintf
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define i32 @f4(i8* %p, i32 %x) nounwind {
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entry:
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; CHECK: define i32 @f4
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; CHECK: @fiprintf
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; CHECK: }
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%0 = tail call i32 (i8*, i8*, ...)* @fprintf(i8 *%p, i8* getelementptr ([4 x i8]* @.str1, i32 0, i32 0), i32 %x)
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ret i32 %0
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}
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; Verify we don't turn this into an fiprintf call
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define i32 @f5(i8* %p, double %x) nounwind {
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entry:
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; CHECK: define i32 @f5
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; CHECK: @fprintf
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; CHECK: }
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%0 = tail call i32 (i8*, i8*, ...)* @fprintf(i8 *%p, i8* getelementptr ([4 x i8]* @.str, i32 0, i32 0), double %x)
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ret i32 %0
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}
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declare i32 @printf(i8* nocapture, ...) nounwind
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declare i32 @sprintf(i8* nocapture, i8* nocapture, ...) nounwind
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declare i32 @fprintf(i8* nocapture, i8* nocapture, ...) nounwind
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