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Optimize fprintf -> iprintf if there are no floating point arguments

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and siprintf is available on the target.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126940 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Richard Osborne 2011-03-03 14:20:22 +00:00
parent 43b4e23bac
commit 022708f221
4 changed files with 53 additions and 8 deletions
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3
include/llvm/Target/TargetLibraryInfo.h
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@ -32,6 +32,9 @@ namespace llvm {
/// int siprintf(char *str, const char *format, ...);
siprintf,
/// int fiprintf(FILE *stream, const char *format, ...);
fiprintf,
NumLibFuncs
};
}

1
lib/Target/TargetLibraryInfo.cpp
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@ -35,6 +35,7 @@ static void initialize(TargetLibraryInfo &TLI, const Triple &T) {
if (T.getArch() != Triple::xcore) {
TLI.setUnavailable(LibFunc::iprintf);
TLI.setUnavailable(LibFunc::siprintf);
TLI.setUnavailable(LibFunc::fiprintf);
}
}

36
lib/Transforms/Scalar/SimplifyLibCalls.cpp
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@ -1330,14 +1330,8 @@ struct FPutsOpt : public LibCallOptimization {
// 'fprintf' Optimizations
struct FPrintFOpt : public LibCallOptimization {
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
// Require two fixed paramters as pointers and integer result.
const FunctionType *FT = Callee->getFunctionType();
if (FT->getNumParams() != 2 || !FT->getParamType(0)->isPointerTy() ||
!FT->getParamType(1)->isPointerTy() ||
!FT->getReturnType()->isIntegerTy())
return 0;
Value *OptimizeFixedFormatString(Function *Callee, CallInst *CI,
IRBuilder<> &B) {
// All the optimizations depend on the format string.
std::string FormatStr;
if (!GetConstantStringInfo(CI->getArgOperand(1), FormatStr))
@ -1382,6 +1376,32 @@ struct FPrintFOpt : public LibCallOptimization {
}
return 0;
}
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
// Require two fixed paramters as pointers and integer result.
const FunctionType *FT = Callee->getFunctionType();
if (FT->getNumParams() != 2 || !FT->getParamType(0)->isPointerTy() ||
!FT->getParamType(1)->isPointerTy() ||
!FT->getReturnType()->isIntegerTy())
return 0;
if (Value *V = OptimizeFixedFormatString(Callee, CI, B)) {
return V;
}
// fprintf(stream, format, ...) -> fiprintf(stream, format, ...) if no
// floating point arguments.
if (TLI->has(LibFunc::fiprintf) && !CallHasFloatingPointArgument(CI)) {
Module *M = B.GetInsertBlock()->getParent()->getParent();
Constant *FIPrintFFn =
M->getOrInsertFunction("fiprintf", FT, Callee->getAttributes());
CallInst *New = cast<CallInst>(CI->clone());
New->setCalledFunction(FIPrintFFn);
B.Insert(New);
return New;
}
return 0;
}
};
//===---------------------------------------===//

21
test/Transforms/SimplifyLibCalls/iprintf.ll
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@ -46,5 +46,26 @@ entry:
ret i32 %0
}
; Verify fprintf with no floating point arguments is transformed to fiprintf
define i32 @f4(i8* %p, i32 %x) nounwind {
entry:
; CHECK: define i32 @f4
; CHECK: @fiprintf
; CHECK: }
%0 = tail call i32 (i8*, i8*, ...)* @fprintf(i8 *%p, i8* getelementptr ([4 x i8]* @.str1, i32 0, i32 0), i32 %x)
ret i32 %0
}
; Verify we don't turn this into an fiprintf call
define i32 @f5(i8* %p, double %x) nounwind {
entry:
; CHECK: define i32 @f5
; CHECK: @fprintf
; CHECK: }
%0 = tail call i32 (i8*, i8*, ...)* @fprintf(i8 *%p, i8* getelementptr ([4 x i8]* @.str, i32 0, i32 0), double %x)
ret i32 %0
}
declare i32 @printf(i8* nocapture, ...) nounwind
declare i32 @sprintf(i8* nocapture, i8* nocapture, ...) nounwind
declare i32 @fprintf(i8* nocapture, i8* nocapture, ...) nounwind