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Refactor/genericize this, no functionality change

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25525 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-01-23 05:57:36 +00:00
parent e7ed39d2e9
commit 7070c5f241
1 changed files with 30 additions and 16 deletions
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46
lib/Transforms/IPO/SimplifyLibCalls.cpp
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@ -1771,27 +1771,27 @@ public:
} FFSLLOptimizer;
/// This LibCallOptimization will simplify calls to the "floor" library
/// function.
/// @brief Simplify the floor library function.
struct FloorOptimization : public LibCallOptimization {
FloorOptimization()
: LibCallOptimization("floor", "Number of 'floor' calls simplified") {}
/// This optimizes unary functions that take and return doubles.
struct UnaryDoubleFPOptimizer : public LibCallOptimization {
UnaryDoubleFPOptimizer(const char *Fn, const char *Desc)
: LibCallOptimization(Fn, Desc) {}
/// @brief Make sure that the "floor" function has the right prototype
// Make sure that this function has the right prototype
virtual bool ValidateCalledFunction(const Function *F, SimplifyLibCalls &SLC){
return F->arg_size() == 1 && F->arg_begin()->getType() == Type::DoubleTy &&
F->getReturnType() == Type::DoubleTy;
}
virtual bool OptimizeCall(CallInst *CI, SimplifyLibCalls &SLC) {
// If this is a float argument passed in, convert to floorf.
// e.g. floor((double)FLT) -> (double)floorf(FLT). There can be no loss of
// precision due to this.
/// ShrinkFunctionToFloatVersion - If the input to this function is really a
/// float, strength reduce this to a float version of the function,
/// e.g. floor((double)FLT) -> (double)floorf(FLT). This can only be called
/// when the target supports the destination function and where there can be
/// no precision loss.
static bool ShrinkFunctionToFloatVersion(CallInst *CI, SimplifyLibCalls &SLC,
Function *(SimplifyLibCalls::*FP)()){
if (CastInst *Cast = dyn_cast<CastInst>(CI->getOperand(1)))
if (Cast->getOperand(0)->getType() == Type::FloatTy) {
Value *New = new CallInst(SLC.get_floorf(), Cast->getOperand(0),
Value *New = new CallInst((SLC.*FP)(), Cast->getOperand(0),
CI->getName(), CI);
New = new CastInst(New, Type::DoubleTy, CI->getName(), CI);
CI->replaceAllUsesWith(New);
@ -1800,13 +1800,27 @@ struct FloorOptimization : public LibCallOptimization {
Cast->eraseFromParent();
return true;
}
return false; // opt failed
return false;
}
};
/// This LibCallOptimization will simplify calls to the "floor" library
/// function.
/// @brief Simplify the floor library function.
struct FloorOptimization : public UnaryDoubleFPOptimizer {
FloorOptimization()
: UnaryDoubleFPOptimizer("floor", "Number of 'floor' calls simplified") {}
virtual bool OptimizeCall(CallInst *CI, SimplifyLibCalls &SLC) {
#ifdef HAVE_FLOORF
FloorOptimization FloorOptimizer;
// If this is a float argument passed in, convert to floorf.
if (ShrinkFunctionToFloatVersion(CI, SLC, &SimplifyLibCalls::get_floorf))
return true;
#endif
return false; // opt failed
}
} FloorOptimizer;