================
@@ -4414,60 +4414,56 @@ RValue CodeGenFunction::EmitBuiltinExpr(const
GlobalDecl GD, unsigned BuiltinID,
case Builtin::BI__builtin_fpclassify: {
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(*this, E);
- // FIXME: for strictfp/IEEE-754 we need to not trap on SNaN here.
Value *V = EmitScalarExpr(E->getArg(5));
- llvm::Type *Ty = ConvertType(E->getArg(5)->getType());
-
- // Create Result
- BasicBlock *Begin = Builder.GetInsertBlock();
- BasicBlock *End = createBasicBlock("fpclassify_end", this->CurFn);
- Builder.SetInsertPoint(End);
- PHINode *Result =
- Builder.CreatePHI(ConvertType(E->getArg(0)->getType()), 4,
- "fpclassify_result");
- // if (V==0) return FP_ZERO
- Builder.SetInsertPoint(Begin);
- Value *IsZero = Builder.CreateFCmpOEQ(V, Constant::getNullValue(Ty),
- "iszero");
+ Value *NanLiteral = EmitScalarExpr(E->getArg(0));
+ Value *InfLiteral = EmitScalarExpr(E->getArg(1));
+ Value *NormalLiteral = EmitScalarExpr(E->getArg(2));
+ Value *SubnormalLiteral = EmitScalarExpr(E->getArg(3));
Value *ZeroLiteral = EmitScalarExpr(E->getArg(4));
- BasicBlock *NotZero = createBasicBlock("fpclassify_not_zero", this->CurFn);
- Builder.CreateCondBr(IsZero, End, NotZero);
- Result->addIncoming(ZeroLiteral, Begin);
- // if (V != V) return FP_NAN
- Builder.SetInsertPoint(NotZero);
- Value *IsNan = Builder.CreateFCmpUNO(V, V, "cmp");
- Value *NanLiteral = EmitScalarExpr(E->getArg(0));
- BasicBlock *NotNan = createBasicBlock("fpclassify_not_nan", this->CurFn);
+ Value *IsNan = Builder.createIsFPClass(V, 0b0000000011);
+ Value *IsInf = Builder.createIsFPClass(V, 0b1000000100);
+ Value *IsNormal = Builder.createIsFPClass(V, 0b0100001000);
+ Value *IsSubnormal = Builder.createIsFPClass(V, 0b0010010000);
----------------
spavloff wrote:
Instead of evaluating all conditions in advance, could they be computed only
when actually needed? For example, if a value turns out to be NaN, all
remaining conditions would be unused. Could such lazy evaluation improve the
performance of the generated code?
https://github.com/llvm/llvm-project/pull/183430
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