================
@@ -3733,6 +3733,210 @@ RValue CodeGenFunction::EmitBuiltinExpr(const
GlobalDecl GD, unsigned BuiltinID,
case Builtin::BI_rotr64:
return emitRotate(E, true);
+ case Builtin::BI__builtin_stdc_leading_zeros: {
+ Value *ArgValue = EmitScalarExpr(E->getArg(0));
+ llvm::Type *ArgType = ArgValue->getType();
+ llvm::Type *ResultType = ConvertType(E->getType());
+ Function *F = CGM.getIntrinsic(Intrinsic::ctlz, ArgType);
+ Value *Result = Builder.CreateCall(F, {ArgValue, Builder.getFalse()});
+ if (Result->getType() != ResultType)
+ Result = Builder.CreateIntCast(Result, ResultType, false);
+ return RValue::get(Result);
+ }
+ case Builtin::BI__builtin_stdc_leading_ones: {
+ Value *ArgValue = EmitScalarExpr(E->getArg(0));
+ llvm::Type *ArgType = ArgValue->getType();
+ llvm::Type *ResultType = ConvertType(E->getType());
+ Function *F = CGM.getIntrinsic(Intrinsic::ctlz, ArgType);
+ Value *Result = Builder.CreateCall(
+ F, {Builder.CreateNot(ArgValue), Builder.getFalse()});
+ if (Result->getType() != ResultType)
+ Result = Builder.CreateIntCast(Result, ResultType, false);
+ return RValue::get(Result);
+ }
+ case Builtin::BI__builtin_stdc_trailing_zeros: {
+ Value *ArgValue = EmitScalarExpr(E->getArg(0));
+ llvm::Type *ArgType = ArgValue->getType();
+ llvm::Type *ResultType = ConvertType(E->getType());
+ Function *F = CGM.getIntrinsic(Intrinsic::cttz, ArgType);
+ Value *Result = Builder.CreateCall(F, {ArgValue, Builder.getFalse()});
+ if (Result->getType() != ResultType)
----------------
erichkeane wrote:
I think we should probably still extract some functions for the common parts
here, I realize I suggested moving in this direction, but this ended up being
an awful amount of repetition.
It seems like there is perhaps a a function that just takes a handful of
arguments to handle a vast majority of these? Plus perhaps leave the
'cleanups' in place/have a few functions that differ by that?
https://github.com/llvm/llvm-project/pull/185978
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