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codegen: ensure i1 bool is widened to i8 before storing #52189

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Nov 17, 2023
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codegen: ensure i1 bool is widened to i8 before storing #52189

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3 changes: 0 additions & 3 deletions src/cgutils.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -783,9 +783,6 @@ static Type *_julia_struct_to_llvm(jl_codegen_params_t *ctx, LLVMContext &ctxt,
lty = JuliaType::get_prjlvalue_ty(ctxt);
isvector = false;
}
else if (ty == (jl_value_t*)jl_bool_type) {
lty = getInt8Ty(ctxt);
}
else if (jl_is_uniontype(ty)) {
// pick an Integer type size such that alignment will generally be correct,
// and always end with an Int8 (selector byte).
Expand Down
27 changes: 8 additions & 19 deletions src/codegen.cpp
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Expand Up @@ -2163,9 +2163,12 @@ static bool valid_as_globalinit(const Value *v) {
return isa<Constant>(v);
}

static Value *zext_struct(jl_codectx_t &ctx, Value *V);

static inline jl_cgval_t value_to_pointer(jl_codectx_t &ctx, Value *v, jl_value_t *typ, Value *tindex)
{
Value *loc;
v = zext_struct(ctx, v);
if (valid_as_globalinit(v)) { // llvm can't handle all the things that could be inside a ConstantExpr
assert(jl_is_concrete_type(typ)); // not legal to have an unboxed abstract type
loc = get_pointer_to_constant(ctx.emission_context, cast<Constant>(v), Align(julia_alignment(typ)), "_j_const", *jl_Module);
Expand Down Expand Up @@ -2291,17 +2294,6 @@ static void alloc_def_flag(jl_codectx_t &ctx, jl_varinfo_t& vi)

// --- utilities ---

static Constant *undef_value_for_type(Type *T) {
auto tracked = CountTrackedPointers(T);
Constant *undef;
if (tracked.count)
// make sure gc pointers (including ptr_phi of union-split) are initialized to NULL
undef = Constant::getNullValue(T);
else
undef = UndefValue::get(T);
return undef;
}

static void CreateTrap(IRBuilder<> &irbuilder, bool create_new_block)
{
Function *f = irbuilder.GetInsertBlock()->getParent();
Expand Down Expand Up @@ -3574,7 +3566,7 @@ static bool emit_builtin_call(jl_codectx_t &ctx, jl_cgval_t *ret, jl_value_t *f,
if (f == jl_builtin_is && nargs == 2) {
// emit comparison test
Value *ans = emit_f_is(ctx, argv[1], argv[2]);
*ret = mark_julia_type(ctx, ctx.builder.CreateZExt(ans, getInt8Ty(ctx.builder.getContext())), false, jl_bool_type);
*ret = mark_julia_type(ctx, ans, false, jl_bool_type);
return true;
}

Expand Down Expand Up @@ -3613,8 +3605,6 @@ static bool emit_builtin_call(jl_codectx_t &ctx, jl_cgval_t *ret, jl_value_t *f,
if (jl_is_type_type(ty.typ) && !jl_has_free_typevars(ty.typ)) {
jl_value_t *tp0 = jl_tparam0(ty.typ);
Value *isa_result = emit_isa(ctx, arg, tp0, Twine()).first;
if (isa_result->getType() == getInt1Ty(ctx.builder.getContext()))
isa_result = ctx.builder.CreateZExt(isa_result, getInt8Ty(ctx.builder.getContext()));
*ret = mark_julia_type(ctx, isa_result, false, jl_bool_type);
return true;
}
Expand Down Expand Up @@ -5551,16 +5541,15 @@ static Value *emit_condition(jl_codectx_t &ctx, const jl_cgval_t &condV, const T
emit_typecheck(ctx, condV, (jl_value_t*)jl_bool_type, msg);
}
if (isbool) {
Value *cond = emit_unbox(ctx, getInt8Ty(ctx.builder.getContext()), condV, (jl_value_t*)jl_bool_type);
assert(cond->getType() == getInt8Ty(ctx.builder.getContext()));
return ctx.builder.CreateXor(ctx.builder.CreateTrunc(cond, getInt1Ty(ctx.builder.getContext())), ConstantInt::get(getInt1Ty(ctx.builder.getContext()), 1));
Value *cond = emit_unbox(ctx, getInt1Ty(ctx.builder.getContext()), condV, (jl_value_t*)jl_bool_type);
return ctx.builder.CreateNot(cond);
}
if (condV.isboxed) {
return ctx.builder.CreateICmpEQ(boxed(ctx, condV),
track_pjlvalue(ctx, literal_pointer_val(ctx, jl_false)));
}
// not a boolean
return ConstantInt::get(getInt1Ty(ctx.builder.getContext()), 0); // TODO: replace with Undef
// not a boolean (unreachable dead code)
return UndefValue::get(getInt1Ty(ctx.builder.getContext()));
}

static Value *emit_condition(jl_codectx_t &ctx, jl_value_t *cond, const Twine &msg)
Expand Down
119 changes: 81 additions & 38 deletions src/intrinsics.cpp
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Expand Up @@ -173,12 +173,7 @@ static Type *INTT(Type *t, const DataLayout &DL)

static Value *uint_cnvt(jl_codectx_t &ctx, Type *to, Value *x)
{
Type *t = x->getType();
if (t == to)
return x;
if (to->getPrimitiveSizeInBits() < x->getType()->getPrimitiveSizeInBits())
return ctx.builder.CreateTrunc(x, to);
return ctx.builder.CreateZExt(x, to);
return ctx.builder.CreateZExtOrTrunc(x, to);
}

static Constant *julia_const_to_llvm(jl_codectx_t &ctx, const void *ptr, jl_datatype_t *bt)
Expand Down Expand Up @@ -317,25 +312,90 @@ static Constant *julia_const_to_llvm(jl_codectx_t &ctx, jl_value_t *e)
return julia_const_to_llvm(ctx, e, (jl_datatype_t*)bt);
}

static Constant *undef_value_for_type(Type *T) {
auto tracked = CountTrackedPointers(T);
Constant *undef;
if (tracked.count)
// make sure gc pointers (including ptr_phi of union-split) are initialized to NULL
undef = Constant::getNullValue(T);
else
undef = UndefValue::get(T);
return undef;
}

// rebuild a struct type with any i1 Bool (e.g. the llvmcall type) widened to i8 (the native size for memcpy)
static Type *zext_struct_type(Type *T)
{
if (auto *AT = dyn_cast<ArrayType>(T)) {
return ArrayType::get(AT->getElementType(), AT->getNumElements());
}
else if (auto *ST = dyn_cast<StructType>(T)) {
SmallVector<Type*> Elements(ST->element_begin(), ST->element_end());
for (size_t i = 0; i < Elements.size(); i++) {
Elements[i] = zext_struct_type(Elements[i]);
}
return StructType::get(ST->getContext(), Elements, ST->isPacked());
}
else if (auto *VT = dyn_cast<VectorType>(T)) {
return VectorType::get(zext_struct_type(VT->getElementType()), VT);
}
else if (auto *IT = dyn_cast<IntegerType>(T)) {
unsigned BitWidth = IT->getBitWidth();
if (alignTo(BitWidth, 8) != BitWidth)
return IntegerType::get(IT->getContext(), alignTo(BitWidth, 8));
}
return T;
}

// rebuild a struct with any i1 Bool (e.g. the llvmcall type) widened to i8 (the native size for memcpy)
static Value *zext_struct_helper(jl_codectx_t &ctx, Value *V, Type *T2)
{
Type *T = V->getType();
if (T == T2)
return V;
if (auto *AT = dyn_cast<ArrayType>(T2)) {
Value *V2 = undef_value_for_type(AT);
for (size_t i = 0; i < AT->getNumElements(); i++) {
Value *E = zext_struct_helper(ctx, ctx.builder.CreateExtractValue(V, i), AT->getElementType());
V2 = ctx.builder.CreateInsertValue(V2, E, i);
}
return V2;
}
else if (auto *ST = dyn_cast<StructType>(T2)) {
Value *V2 = undef_value_for_type(ST);
for (size_t i = 0; i < ST->getNumElements(); i++) {
Value *E = zext_struct_helper(ctx, ctx.builder.CreateExtractValue(V, i), ST->getElementType(i));
V2 = ctx.builder.CreateInsertValue(V2, E, i);
}
return V2;
}
else if (T2->isIntegerTy() || T2->isVectorTy()) {
return ctx.builder.CreateZExt(V, T2);
}
return V;
}

static Value *zext_struct(jl_codectx_t &ctx, Value *V)
{
return zext_struct_helper(ctx, V, zext_struct_type(V->getType()));
}

static Value *emit_unboxed_coercion(jl_codectx_t &ctx, Type *to, Value *unboxed)
{
if (unboxed->getType() == to)
return unboxed;
if (CastInst::castIsValid(Instruction::Trunc, unboxed, to))
return ctx.builder.CreateTrunc(unboxed, to);
unboxed = zext_struct(ctx, unboxed);
Type *ty = unboxed->getType();
if (ty == to)
return unboxed;
bool frompointer = ty->isPointerTy();
bool topointer = to->isPointerTy();
const DataLayout &DL = jl_Module->getDataLayout();
if (ty->isIntegerTy(1) && to->isIntegerTy(8)) {
// bools may be stored internally as int8
unboxed = ctx.builder.CreateZExt(unboxed, to);
}
else if (ty->isIntegerTy(8) && to->isIntegerTy(1)) {
// bools may be stored internally as int8
unboxed = ctx.builder.CreateTrunc(unboxed, to);
}
else if (ty->isVoidTy() || DL.getTypeSizeInBits(ty) != DL.getTypeSizeInBits(to)) {
if (ty->isVoidTy() || DL.getTypeSizeInBits(ty) != DL.getTypeSizeInBits(to)) {
// this can happen in dead code
//emit_unreachable(ctx);
CreateTrap(ctx.builder);
return UndefValue::get(to);
}
if (frompointer && topointer) {
Expand Down Expand Up @@ -380,7 +440,7 @@ static Value *emit_unbox(jl_codectx_t &ctx, Type *to, const jl_cgval_t &x, jl_va
if (type_is_ghost(to)) {
return NULL;
}
//emit_unreachable(ctx);
CreateTrap(ctx.builder);
return UndefValue::get(to); // type mismatch error
}

Expand Down Expand Up @@ -446,17 +506,9 @@ static void emit_unbox_store(jl_codectx_t &ctx, const jl_cgval_t &x, Value *dest
return;
}

Value *unboxed = nullptr;
if (!x.ispointer()) { // already unboxed, but sometimes need conversion
unboxed = x.V;
assert(unboxed);
}

// bools stored as int8, but can be narrowed to int1 often
if (x.typ == (jl_value_t*)jl_bool_type)
unboxed = emit_unbox(ctx, getInt8Ty(ctx.builder.getContext()), x, (jl_value_t*)jl_bool_type);

if (unboxed) {
if (!x.ispointer()) { // already unboxed, but sometimes need conversion (e.g. f32 -> i32)
assert(x.V);
Value *unboxed = zext_struct(ctx, x.V);
Type *dest_ty = unboxed->getType()->getPointerTo();
if (dest->getType() != dest_ty)
dest = emit_bitcast(ctx, dest, dest_ty);
Expand Down Expand Up @@ -1445,23 +1497,14 @@ static Value *emit_untyped_intrinsic(jl_codectx_t &ctx, intrinsic f, Value **arg
Intrinsic::smul_with_overflow :
Intrinsic::umul_with_overflow)))));
FunctionCallee intr = Intrinsic::getDeclaration(jl_Module, intr_id, ArrayRef<Type*>(t));
Value *res = ctx.builder.CreateCall(intr, {x, y});
Value *val = ctx.builder.CreateExtractValue(res, ArrayRef<unsigned>(0));
setName(ctx.emission_context, val, "checked");
Value *obit = ctx.builder.CreateExtractValue(res, ArrayRef<unsigned>(1));
setName(ctx.emission_context, obit, "overflow");
Value *obyte = ctx.builder.CreateZExt(obit, getInt8Ty(ctx.builder.getContext()));
Value *tupval = ctx.builder.CreateCall(intr, {x, y});

jl_value_t *params[2];
params[0] = xtyp;
params[1] = (jl_value_t*)jl_bool_type;
jl_datatype_t *tuptyp = (jl_datatype_t*)jl_apply_tuple_type_v(params, 2);
*newtyp = tuptyp;

Value *tupval;
tupval = UndefValue::get(julia_type_to_llvm(ctx, (jl_value_t*)tuptyp));
tupval = ctx.builder.CreateInsertValue(tupval, val, ArrayRef<unsigned>(0));
tupval = ctx.builder.CreateInsertValue(tupval, obyte, ArrayRef<unsigned>(1));
return tupval;
}

Expand Down
9 changes: 9 additions & 0 deletions test/llvmcall2.jl
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Expand Up @@ -73,3 +73,12 @@ end
jl_str = unsafe_string(str)
@test length(jl_str) > 4
end


# boolean structs
const NT4I = NTuple{4, VecElement{Int}}
const NT4B = NTuple{4, VecElement{Bool}}
f_nt4b(x, y) = ccall("llvm.sadd.with.overflow", llvmcall, Pair{NT4B, NT4B}, (NT4B, NT4B), x, y)
f_nt4i(x, y) = ccall("llvm.sadd.with.overflow", llvmcall, Pair{NT4I, NT4B}, (NT4I, NT4I), x, y)
@test f_nt4b((false, true, false, true), (false, false, true, true)) === (NT4B((false, true, true, false)) => NT4B((false, false, false, true)))
@test f_nt4i((typemin(Int), 0, typemax(Int), typemax(Int)), (-1, typemax(Int),-1, 1)) === (NT4I((typemax(Int), typemax(Int), typemax(Int)-1, typemin(Int))) => NT4B((true, false, false, true)))