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nac3core: list slice support

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This commit is contained in:
ychenfo 2022-01-09 19:55:17 +08:00
parent 82509d60ec
commit 4976e89ae2
5 changed files with 510 additions and 111 deletions
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62
nac3core/src/codegen/expr.rs
View File

@ -4,7 +4,7 @@ use crate::{
codegen::{
concrete_type::{ConcreteFuncArg, ConcreteTypeEnum, ConcreteTypeStore},
get_llvm_type,
irrt::integer_power,
irrt::*,
CodeGenContext, CodeGenTask,
},
symbol_resolver::{SymbolValue, ValueEnum},
@ -1028,31 +1028,59 @@ pub fn gen_expr<'ctx, 'a, G: CodeGenerator>(
}
}
ExprKind::Subscript { value, slice, .. } => {
if let TypeEnum::TList { .. } = &*ctx.unifier.get_ty(value.custom.unwrap()) {
if let ExprKind::Slice { .. } = slice.node {
unimplemented!()
let v = generator
.gen_expr(ctx, value)
.unwrap()
.to_basic_value_enum(ctx, generator)
.into_pointer_value();
if let TypeEnum::TList { ty } = &*ctx.unifier.get_ty(value.custom.unwrap()) {
let ty = ctx.get_llvm_type(generator, *ty);
let arr_ptr = ctx.build_gep_and_load(v, &[zero, zero]).into_pointer_value();
if let ExprKind::Slice { lower, upper, step } = &slice.node {
let one = int32.const_int(1, false);
let (start, end, step) =
handle_slice_indices(lower, upper, step, ctx, generator, v);
let length = calculate_len_for_slice_range(
ctx,
start,
ctx.builder
.build_select(
ctx.builder.build_int_compare(
inkwell::IntPredicate::SLT,
step,
zero,
"is_neg",
),
ctx.builder.build_int_sub(end, one, "e_min_one"),
ctx.builder.build_int_add(end, one, "e_add_one"),
"final_e",
)
.into_int_value(),
step,
);
let res_array_ret = allocate_list(generator, ctx, ty, length);
let res_ind =
handle_slice_indices(&None, &None, &None, ctx, generator, res_array_ret);
list_slice_assignment(
ctx,
generator.get_size_type(ctx.ctx),
ty,
res_array_ret,
res_ind,
v,
(start, end, step),
);
res_array_ret.into()
} else {
// TODO: bound check
let v = generator
.gen_expr(ctx, value)
.unwrap()
.to_basic_value_enum(ctx, generator)
.into_pointer_value();
let index = generator
.gen_expr(ctx, slice)
.unwrap()
.to_basic_value_enum(ctx, generator)
.into_int_value();
let zero = int32.const_zero();
let arr_ptr = ctx.build_gep_and_load(v, &[zero, zero]);
ctx.build_gep_and_load(arr_ptr.into_pointer_value(), &[index])
ctx.build_gep_and_load(arr_ptr, &[index])
}
} else {
let v = generator
.gen_expr(ctx, value)
.unwrap()
.to_basic_value_enum(ctx, generator)
.into_pointer_value();
let index = generator
.gen_expr(ctx, slice)
.unwrap()

108
nac3core/src/codegen/irrt/irrt.c
View File

@ -5,9 +5,12 @@ typedef unsigned _ExtInt(32) uint32_t;
typedef _ExtInt(64) int64_t;
typedef unsigned _ExtInt(64) uint64_t;
# define MAX(a, b) (a > b ? a : b)
# define MIN(a, b) (a > b ? b : a)
// adapted from GNU Scientific Library: https://git.savannah.gnu.org/cgit/gsl.git/tree/sys/pow_int.c
// need to make sure `exp >= 0` before calling this function
#define DEF_INT_EXP(T) T __nac3_irrt_int_exp_##T( \
#define DEF_INT_EXP(T) T __nac3_int_exp_##T( \
T base, \
T exp \
) { \
@ -23,3 +26,106 @@ typedef unsigned _ExtInt(64) uint64_t;
DEF_INT_EXP(int32_t)
DEF_INT_EXP(int64_t)
int32_t __nac3_slice_index_bound(int32_t i, const int32_t len) {
if (i < 0) {
i = len + i;
}
if (i < 0) {
return 0;
} else if (i > len) {
return len;
}
return i;
}
int32_t __nac3_range_slice_len(const int32_t start, const int32_t end, const int32_t step) {
int32_t diff = end - start;
if (diff > 0 && step > 0) {
return ((diff - 1) / step) + 1;
} else if (diff < 0 && step < 0) {
return ((diff + 1) / step) + 1;
} else {
return 0;
}
}
// Handle list assignment and dropping part of the list when
// both dest_step and src_step are +1.
// - All the index must *not* be out-of-bound or negative,
// - The end index is *inclusive*,
// - The length of src and dest slice size should already
// be checked: if dest.step == 1 then len(src) <= len(dest) else len(src) == len(dest)
# define DEF_SLICE_ASSIGN(T) int32_t __nac3_list_slice_assign_##T( \
int32_t dest_start, \
int32_t dest_end, \
int32_t dest_step, \
T *dest_arr, \
int32_t dest_arr_len, \
int32_t src_start, \
int32_t src_end, \
int32_t src_step, \
T *src_arr, \
int32_t src_arr_len \
) { \
/* if dest_arr_len == 0, do nothing since we do not support extending list */ \
if (dest_arr_len == 0) return dest_arr_len; \
/* if both step is 1, memmove directly, handle the dropping of the list, and shrink size */ \
if (src_step == dest_step && dest_step == 1) { \
const int32_t src_len = (src_end >= src_start) ? (src_end - src_start + 1) : 0; \
const int32_t dest_len = (dest_end >= dest_start) ? (dest_end - dest_start + 1) : 0; \
if (src_len > 0) { \
__builtin_memmove( \
dest_arr + dest_start, \
src_arr + src_start, \
src_len * sizeof(T) \
); \
} \
if (dest_len > 0) { \
/* dropping */ \
__builtin_memmove( \
dest_arr + dest_start + src_len, \
dest_arr + dest_end + 1, \
(dest_arr_len - dest_end - 1) * sizeof(T) \
); \
} \
/* shrink size */ \
return dest_arr_len - (dest_len - src_len); \
} \
/* if two range overlaps, need alloca */ \
uint8_t need_alloca = \
(dest_arr == src_arr) \
&& !( \
MAX(dest_start, dest_end) < MIN(src_start, src_end) \
|| MAX(src_start, src_end) < MIN(dest_start, dest_end) \
); \
if (need_alloca) { \
T *tmp = alloca(src_arr_len * sizeof(T)); \
__builtin_memcpy(tmp, src_arr, src_arr_len * sizeof(T)); \
src_arr = tmp; \
} \
int32_t src_ind = src_start; \
int32_t dest_ind = dest_start; \
for (; \
(src_step > 0) ? (src_ind <= src_end) : (src_ind >= src_end); \
src_ind += src_step, dest_ind += dest_step \
) { \
dest_arr[dest_ind] = src_arr[src_ind]; \
} \
/* only dest_step == 1 can we shrink the dest list. */ \
/* size should be ensured prior to calling this function */ \
if (dest_step == 1 && dest_end >= dest_start) { \
__builtin_memmove( \
dest_arr + dest_ind, \
dest_arr + dest_end + 1, \
(dest_arr_len - dest_end - 1) * sizeof(T) \
); \
return dest_arr_len - (dest_end - dest_ind) - 1; \
} \
return dest_arr_len; \
} \
DEF_SLICE_ASSIGN(uint8_t)
DEF_SLICE_ASSIGN(uint32_t)
DEF_SLICE_ASSIGN(uint64_t)

304
nac3core/src/codegen/irrt/mod.rs
View File

@ -1,11 +1,16 @@
use super::CodeGenContext;
use crate::typecheck::typedef::Type;
use super::{CodeGenContext, CodeGenerator};
use inkwell::{
attributes::{Attribute, AttributeLoc},
context::Context,
memory_buffer::MemoryBuffer,
module::Module,
values::IntValue,
types::{BasicTypeEnum, IntType},
values::{IntValue, PointerValue},
AddressSpace, IntPredicate,
};
use nac3parser::ast::Expr;
pub fn load_irrt(ctx: &Context) -> Module {
let bitcode_buf = MemoryBuffer::create_from_memory_range(
@ -14,7 +19,12 @@ pub fn load_irrt(ctx: &Context) -> Module {
);
let irrt_mod = Module::parse_bitcode_from_buffer(&bitcode_buf, ctx).unwrap();
let inline_attr = Attribute::get_named_enum_kind_id("alwaysinline");
for symbol in &["__nac3_irrt_int_exp_int32_t", "__nac3_irrt_int_exp_int64_t"] {
for symbol in &[
"__nac3_int_exp_int32_t",
"__nac3_int_exp_int64_t",
"__nac3_range_slice_len",
"__nac3_slice_index_bound",
] {
let function = irrt_mod.get_function(symbol).unwrap();
function.add_attribute(AttributeLoc::Function, ctx.create_enum_attribute(inline_attr, 0));
}
@ -29,8 +39,8 @@ pub fn integer_power<'ctx, 'a>(
exp: IntValue<'ctx>,
) -> IntValue<'ctx> {
let symbol = match (base.get_type().get_bit_width(), exp.get_type().get_bit_width()) {
(32, 32) => "__nac3_irrt_int_exp_int32_t",
(64, 64) => "__nac3_irrt_int_exp_int64_t",
(32, 32) => "__nac3_int_exp_int32_t",
(64, 64) => "__nac3_int_exp_int64_t",
_ => unreachable!(),
};
let base_type = base.get_type();
@ -45,3 +55,287 @@ pub fn integer_power<'ctx, 'a>(
.unwrap_left()
.into_int_value()
}
pub fn calculate_len_for_slice_range<'ctx, 'a>(
ctx: &mut CodeGenContext<'ctx, 'a>,
start: IntValue<'ctx>,
end: IntValue<'ctx>,
step: IntValue<'ctx>,
) -> IntValue<'ctx> {
const SYMBOL: &str = "__nac3_range_slice_len";
let len_func = ctx.module.get_function(SYMBOL).unwrap_or_else(|| {
let i32_t = ctx.ctx.i32_type();
let fn_t = i32_t.fn_type(&[i32_t.into(), i32_t.into(), i32_t.into()], false);
ctx.module.add_function(SYMBOL, fn_t, None)
});
// TODO: assert step != 0, throw exception if not
ctx.builder
.build_call(len_func, &[start.into(), end.into(), step.into()], "calc_len")
.try_as_basic_value()
.left()
.unwrap()
.into_int_value()
}
/// NOTE: the output value of the end index of this function should be compared ***inclusively***,
/// because python allows `a[2::-1]`, whose semantic is `[a[2], a[1], a[0]]`, which is equivalent to
/// NO numeric slice in python.
///
/// equivalent code:
/// ```pseudo_code
/// match (start, end, step):
/// case (s, e, None | Some(step)) if step > 0:
/// return (
/// match s:
/// case None:
/// 0
/// case Some(s):
/// handle_in_bound(s)
/// ,match e:
/// case None:
/// length - 1
/// case Some(e):
/// handle_in_bound(e) - 1
/// ,step == None ? 1 : step
/// )
/// case (s, e, Some(step)) if step < 0:
/// return (
/// match s:
/// case None:
/// length - 1
/// case Some(s):
/// s = handle_in_bound(s)
/// if s == length:
/// s - 1
/// else:
/// s
/// ,match e:
/// case None:
/// 0
/// case Some(e):
/// handle_in_bound(e) + 1
/// ,step
/// )
/// ```
pub fn handle_slice_indices<'a, 'ctx, G: CodeGenerator>(
start: &Option<Box<Expr<Option<Type>>>>,
end: &Option<Box<Expr<Option<Type>>>>,
step: &Option<Box<Expr<Option<Type>>>>,
ctx: &mut CodeGenContext<'ctx, 'a>,
generator: &mut G,
list: PointerValue<'ctx>,
) -> (IntValue<'ctx>, IntValue<'ctx>, IntValue<'ctx>) {
// TODO: throw exception when step is 0
let int32 = ctx.ctx.i32_type();
let zero = int32.const_zero();
let one = int32.const_int(1, false);
let length = ctx.build_gep_and_load(list, &[zero, one]).into_int_value();
let length = ctx.builder.build_int_truncate_or_bit_cast(length, int32, "leni32");
match (start, end, step) {
(s, e, None) => (
s.as_ref().map_or_else(
|| int32.const_zero(),
|s| handle_slice_index_bound(s, ctx, generator, length),
),
{
let e = e.as_ref().map_or_else(
|| length,
|e| handle_slice_index_bound(e, ctx, generator, length),
);
ctx.builder.build_int_sub(e, one, "final_end")
},
one,
),
(s, e, Some(step)) => {
let step = generator
.gen_expr(ctx, step)
.unwrap()
.to_basic_value_enum(ctx, generator)
.into_int_value();
let len_id = ctx.builder.build_int_sub(length, one, "lenmin1");
let neg = ctx.builder.build_int_compare(IntPredicate::SLT, step, zero, "step_is_neg");
(
match s {
Some(s) => {
let s = handle_slice_index_bound(s, ctx, generator, length);
ctx.builder
.build_select(
ctx.builder.build_and(
ctx.builder.build_int_compare(
IntPredicate::EQ,
s,
length,
"s_eq_len",
),
neg,
"should_minus_one",
),
ctx.builder.build_int_sub(s, one, "s_min"),
s,
"final_start",
)
.into_int_value()
}
None => ctx.builder.build_select(neg, len_id, zero, "stt").into_int_value(),
},
match e {
Some(e) => {
let e = handle_slice_index_bound(e, ctx, generator, length);
ctx.builder
.build_select(
neg,
ctx.builder.build_int_add(e, one, "end_add_one"),
ctx.builder.build_int_sub(e, one, "end_sub_one"),
"final_end",
)
.into_int_value()
}
None => ctx.builder.build_select(neg, zero, len_id, "end").into_int_value(),
},
step,
)
}
}
}
/// this function allows index out of range, since python
/// allows index out of range in slice (`a = [1,2,3]; a[1:10] == [2,3]`).
pub fn handle_slice_index_bound<'a, 'ctx, G: CodeGenerator>(
i: &Expr<Option<Type>>,
ctx: &mut CodeGenContext<'ctx, 'a>,
generator: &mut G,
length: IntValue<'ctx>,
) -> IntValue<'ctx> {
const SYMBOL: &str = "__nac3_slice_index_bound";
let func = ctx.module.get_function(SYMBOL).unwrap_or_else(|| {
let i32_t = ctx.ctx.i32_type();
let fn_t = i32_t.fn_type(&[i32_t.into(), i32_t.into()], false);
ctx.module.add_function(SYMBOL, fn_t, None)
});
let i = generator.gen_expr(ctx, i).unwrap().to_basic_value_enum(ctx, generator);
ctx.builder
.build_call(func, &[i.into(), length.into()], "bounded_ind")
.try_as_basic_value()
.left()
.unwrap()
.into_int_value()
}
/// This function handles 'end' **inclusively**.
/// Order of tuples assign_idx and value_idx is ('start', 'end', 'step').
/// Negative index should be handled before entering this function
pub fn list_slice_assignment<'ctx, 'a>(
ctx: &mut CodeGenContext<'ctx, 'a>,
size_ty: IntType<'ctx>,
ty: BasicTypeEnum<'ctx>,
dest_arr: PointerValue<'ctx>,
dest_idx: (IntValue<'ctx>, IntValue<'ctx>, IntValue<'ctx>),
src_arr: PointerValue<'ctx>,
src_idx: (IntValue<'ctx>, IntValue<'ctx>, IntValue<'ctx>),
) {
let int8_ptr = ctx.ctx.i8_type().ptr_type(AddressSpace::Generic);
let int32 = ctx.ctx.i32_type();
let int32_ptr = int32.ptr_type(AddressSpace::Generic);
let int64_ptr = ctx.ctx.i64_type().ptr_type(AddressSpace::Generic);
let fun_symbol = if let BasicTypeEnum::IntType(ty) = ty {
match ty.get_bit_width() {
w if w < 32 => "__nac3_list_slice_assign_uint8_t",
32 => "__nac3_list_slice_assign_uint32_t",
64 => "__nac3_list_slice_assign_uint64_t",
_ => unreachable!(),
}
} else if ty.is_float_type() {
"__nac3_list_slice_assign_uint64_t"
} else if ty.is_pointer_type() {
match size_ty.get_bit_width() {
32 => "__nac3_list_slice_assign_uint32_t",
64 => "__nac3_list_slice_assign_uint64_t",
_ => unreachable!(),
}
} else {
unreachable!()
};
let elem_ptr_type = match fun_symbol {
"__nac3_list_slice_assign_uint8_t" => int8_ptr,
"__nac3_list_slice_assign_uint32_t" => int32_ptr,
"__nac3_list_slice_assign_uint64_t" => int64_ptr,
_ => unreachable!(),
};
let slice_assign_fun = ctx.module.get_function(fun_symbol).unwrap_or_else(|| {
let fn_t = int32.fn_type(
&[
int32.into(), // dest start idx
int32.into(), // dest end idx
int32.into(), // dest step
elem_ptr_type.into(), // dest arr ptr
int32.into(), // dest arr len
int32.into(), // src start idx
int32.into(), // src end idx
int32.into(), // src step
elem_ptr_type.into(), // src arr ptr
int32.into(), // src arr len
],
false,
);
ctx.module.add_function(fun_symbol, fn_t, None)
});
let zero = int32.const_zero();
let one = int32.const_int(1, false);
let dest_arr_ptr = ctx.build_gep_and_load(dest_arr, &[zero, zero]);
let dest_arr_ptr = ctx.builder.build_pointer_cast(
dest_arr_ptr.into_pointer_value(),
elem_ptr_type,
"dest_arr_ptr_cast",
);
let dest_len = ctx.build_gep_and_load(dest_arr, &[zero, one]).into_int_value();
let dest_len = ctx.builder.build_int_truncate_or_bit_cast(dest_len, int32, "srclen32");
let src_arr_ptr = ctx.build_gep_and_load(src_arr, &[zero, zero]);
let src_arr_ptr = ctx.builder.build_pointer_cast(
src_arr_ptr.into_pointer_value(),
elem_ptr_type,
"src_arr_ptr_cast",
);
let src_len = ctx.build_gep_and_load(src_arr, &[zero, one]).into_int_value();
let src_len = ctx.builder.build_int_truncate_or_bit_cast(src_len, int32, "srclen32");
// index in bound and positive should be done
// TODO: assert if dest.step == 1 then len(src) <= len(dest) else len(src) == len(dest), and
// throw exception if not satisfied
let new_len = ctx
.builder
.build_call(
slice_assign_fun,
&[
dest_idx.0.into(), // dest start idx
dest_idx.1.into(), // dest end idx
dest_idx.2.into(), // dest step
dest_arr_ptr.into(), // dest arr ptr
dest_len.into(), // dest arr len
src_idx.0.into(), // src start idx
src_idx.1.into(), // src end idx
src_idx.2.into(), // src step
src_arr_ptr.into(), // src arr ptr
src_len.into(), // src arr len
],
"slice_assign",
)
.try_as_basic_value()
.unwrap_left()
.into_int_value();
// update length
let need_update =
ctx.builder.build_int_compare(IntPredicate::NE, new_len, dest_len, "need_update");
let current = ctx.builder.get_insert_block().unwrap().get_parent().unwrap();
let update_bb = ctx.ctx.append_basic_block(current, "update");
let cont_bb = ctx.ctx.append_basic_block(current, "cont");
ctx.builder.build_conditional_branch(need_update, update_bb, cont_bb);
ctx.builder.position_at_end(update_bb);
let dest_len_ptr = unsafe { ctx.builder.build_gep(dest_arr, &[zero, one], "dest_len_ptr") };
let new_len = ctx.builder.build_int_z_extend_or_bit_cast(new_len, size_ty, "new_len");
ctx.builder.build_store(dest_len_ptr, new_len);
ctx.builder.build_unconditional_branch(cont_bb);
ctx.builder.position_at_end(cont_bb);
}

63
nac3core/src/codegen/stmt.rs
View File

@ -1,7 +1,13 @@
use super::{
super::symbol_resolver::ValueEnum, expr::destructure_range, CodeGenContext, CodeGenerator,
super::symbol_resolver::ValueEnum,
expr::destructure_range,
irrt::{handle_slice_indices, list_slice_assignment},
CodeGenContext, CodeGenerator,
};
use crate::{
codegen::expr::gen_binop_expr,
typecheck::typedef::{Type, TypeEnum},
};
use crate::{codegen::expr::gen_binop_expr, typecheck::typedef::Type};
use inkwell::{
types::BasicTypeEnum,
values::{BasicValue, BasicValueEnum, PointerValue},
@ -97,16 +103,53 @@ pub fn gen_assign<'ctx, 'a, G: CodeGenerator>(
unreachable!()
}
} else {
let ptr = generator.gen_store_target(ctx, target);
if let ExprKind::Name { id, .. } = &target.node {
let (_, static_value, counter) = ctx.var_assignment.get_mut(id).unwrap();
*counter += 1;
if let ValueEnum::Static(s) = &value {
*static_value = Some(s.clone());
match &target.node {
ExprKind::Subscript { value: ls, slice, .. }
if matches!(&slice.node, ExprKind::Slice { .. }) =>
{
if let ExprKind::Slice { lower, upper, step } = &slice.node {
let ls = generator
.gen_expr(ctx, ls)
.unwrap()
.to_basic_value_enum(ctx, generator)
.into_pointer_value();
let (start, end, step) =
handle_slice_indices(lower, upper, step, ctx, generator, ls);
let value = value.to_basic_value_enum(ctx, generator).into_pointer_value();
let ty = if let TypeEnum::TList { ty } =
&*ctx.unifier.get_ty(target.custom.unwrap())
{
ctx.get_llvm_type(generator, *ty)
} else {
unreachable!()
};
let src_ind = handle_slice_indices(&None, &None, &None, ctx, generator, value);
list_slice_assignment(
ctx,
generator.get_size_type(ctx.ctx),
ty,
ls,
(start, end, step),
value,
src_ind,
)
} else {
unreachable!()
}
}
_ => {
let ptr = generator.gen_store_target(ctx, target);
if let ExprKind::Name { id, .. } = &target.node {
let (_, static_value, counter) = ctx.var_assignment.get_mut(id).unwrap();
*counter += 1;
if let ValueEnum::Static(s) = &value {
*static_value = Some(s.clone());
}
}
let val = value.to_basic_value_enum(ctx, generator);
ctx.builder.build_store(ptr, val);
}
}
let val = value.to_basic_value_enum(ctx, generator);
ctx.builder.build_store(ptr, val);
}
}

84
nac3core/src/toplevel/builtins.rs
View File

@ -1,7 +1,10 @@
use std::cell::RefCell;
use inkwell::{IntPredicate::{self, *}, FloatPredicate, values::IntValue};
use crate::{symbol_resolver::SymbolValue, codegen::expr::destructure_range};
use super::*;
use crate::{
codegen::{expr::destructure_range, irrt::calculate_len_for_slice_range},
symbol_resolver::SymbolValue,
};
use inkwell::{FloatPredicate, IntPredicate};
use std::cell::RefCell;
type BuiltinInfo = (
Vec<(Arc<RwLock<TopLevelDef>>, Option<Stmt>)>,
@ -622,78 +625,3 @@ pub fn get_builtins(primitives: &mut (PrimitiveStore, Unifier)) -> BuiltinInfo {
]
)
}
// equivalent code:
// def length(start, end, step != 0):
// diff = end - start
// if diff > 0 and step > 0:
// return ((diff - 1) // step) + 1
// elif diff < 0 and step < 0:
// return ((diff + 1) // step) + 1
// else:
// return 0
pub fn calculate_len_for_slice_range<'ctx, 'a>(
ctx: &mut CodeGenContext<'ctx, 'a>,
start: IntValue<'ctx>,
end: IntValue<'ctx>,
step: IntValue<'ctx>,
) -> IntValue<'ctx> {
let int32 = ctx.ctx.i32_type();
let start = ctx.builder.build_int_s_extend(start, int32, "start");
let end = ctx.builder.build_int_s_extend(end, int32, "end");
let step = ctx.builder.build_int_s_extend(step, int32, "step");
let diff = ctx.builder.build_int_sub(end, start, "diff");
let diff_pos = ctx.builder.build_int_compare(SGT, diff, int32.const_zero(), "diffpos");
let step_pos = ctx.builder.build_int_compare(SGT, step, int32.const_zero(), "steppos");
let test_1 = ctx.builder.build_and(diff_pos, step_pos, "bothpos");
let current = ctx.builder.get_insert_block().unwrap().get_parent().unwrap();
let then_bb = ctx.ctx.append_basic_block(current, "then");
let else_bb = ctx.ctx.append_basic_block(current, "else");
let then_bb_2 = ctx.ctx.append_basic_block(current, "then_2");
let else_bb_2 = ctx.ctx.append_basic_block(current, "else_2");
let cont_bb_2 = ctx.ctx.append_basic_block(current, "cont_2");
let cont_bb = ctx.ctx.append_basic_block(current, "cont");
ctx.builder.build_conditional_branch(test_1, then_bb, else_bb);
ctx.builder.position_at_end(then_bb);
let length_pos = {
let diff_pos_min_1 = ctx.builder.build_int_sub(diff, int32.const_int(1, false), "diffminone");
let length_pos = ctx.builder.build_int_signed_div(diff_pos_min_1, step, "div");
ctx.builder.build_int_add(length_pos, int32.const_int(1, false), "add1")
};
ctx.builder.build_unconditional_branch(cont_bb);
ctx.builder.position_at_end(else_bb);
let phi_1 = {
let diff_neg = ctx.builder.build_int_compare(SLT, diff, int32.const_zero(), "diffneg");
let step_neg = ctx.builder.build_int_compare(SLT, step, int32.const_zero(), "stepneg");
let test_2 = ctx.builder.build_and(diff_neg, step_neg, "bothneg");
ctx.builder.build_conditional_branch(test_2, then_bb_2, else_bb_2);
ctx.builder.position_at_end(then_bb_2);
let length_neg = {
let diff_neg_add_1 = ctx.builder.build_int_add(diff, int32.const_int(1, false), "diffminone");
let length_neg = ctx.builder.build_int_signed_div(diff_neg_add_1, step, "div");
ctx.builder.build_int_add(length_neg, int32.const_int(1, false), "add1")
};
ctx.builder.build_unconditional_branch(cont_bb_2);
ctx.builder.position_at_end(else_bb_2);
let length_zero = int32.const_zero();
ctx.builder.build_unconditional_branch(cont_bb_2);
ctx.builder.position_at_end(cont_bb_2);
let phi_1 = ctx.builder.build_phi(int32, "lenphi1");
phi_1.add_incoming(&[(&length_neg, then_bb_2), (&length_zero, else_bb_2)]);
phi_1.as_basic_value().into_int_value()
};
ctx.builder.build_unconditional_branch(cont_bb);
ctx.builder.position_at_end(cont_bb);
let phi = ctx.builder.build_phi(int32, "lenphi");
phi.add_incoming(&[(&length_pos, then_bb), (&phi_1, cont_bb_2)]);
phi.as_basic_value().into_int_value()
}