+ // (fptrunc (select cond, R1, Cst)) -->
+ // (select cond, (fptrunc R1), (fptrunc Cst))
+ SelectInst *SI = dyn_cast<SelectInst>(CI.getOperand(0));
+ if (SI &&
+ (isa<ConstantFP>(SI->getOperand(1)) ||
+ isa<ConstantFP>(SI->getOperand(2)))) {
+ Value *LHSTrunc = Builder->CreateFPTrunc(SI->getOperand(1),
+ CI.getType());
+ Value *RHSTrunc = Builder->CreateFPTrunc(SI->getOperand(2),
+ CI.getType());
+ return SelectInst::Create(SI->getOperand(0), LHSTrunc, RHSTrunc);
+ }
+