Second loop in List append (non-functional)

This commit is contained in:
Chad Stearns 2020-07-14 21:50:35 -04:00
parent f807947ce4
commit a5462b1043
2 changed files with 265 additions and 24 deletions

View file

@ -1870,27 +1870,27 @@ fn run_low_level<'a, 'ctx, 'env>(
empty_list(env) empty_list(env)
} }
Layout::Builtin(Builtin::List(elem_layout)) => { Layout::Builtin(Builtin::List(elem_layout)) => {
let first_list_wrapper_struct = let first_list_wrapper =
build_expr(env, layout_ids, scope, parent, first_list).into_struct_value(); build_expr(env, layout_ids, scope, parent, first_list).into_struct_value();
let builder = env.builder; let builder = env.builder;
let ctx = env.context; let ctx = env.context;
let first_list_len = load_list_len(builder, first_list_wrapper_struct); let first_list_len = load_list_len(builder, first_list_wrapper);
// first_list_len > 0 // first_list_len > 0
// We do this check to avoid allocating memory. If the first input // We do this check to avoid allocating memory. If the first input
// list is empty, then we can just return the second list cloned // list is empty, then we can just return the second list cloned
let first_list_empty_comparison = let first_list_length_comparison =
list_is_not_empty(builder, ctx, first_list_len); list_is_not_empty(builder, ctx, first_list_len);
let build_first_list_non_empty_then = || { let build_first_list_then = || {
let (second_list, second_list_layout) = &args[1]; let (second_list, second_list_layout) = &args[1];
let second_list_wrapper_struct = let second_list_wrapper =
build_expr(env, layout_ids, scope, parent, second_list) build_expr(env, layout_ids, scope, parent, second_list)
.into_struct_value(); .into_struct_value();
let second_list_len = load_list_len(builder, second_list_wrapper_struct); let second_list_len = load_list_len(builder, second_list_wrapper);
match second_list_layout { match second_list_layout {
Layout::Builtin(Builtin::EmptyList) => { Layout::Builtin(Builtin::EmptyList) => {
@ -1905,7 +1905,7 @@ fn run_low_level<'a, 'ctx, 'env>(
let (new_wrapper, _) = clone_nonempty_list( let (new_wrapper, _) = clone_nonempty_list(
env, env,
first_list_len, first_list_len,
load_list_ptr(builder, first_list_wrapper_struct, ptr_type), load_list_ptr(builder, first_list_wrapper, ptr_type),
elem_layout, elem_layout,
); );
@ -1915,18 +1915,256 @@ fn run_low_level<'a, 'ctx, 'env>(
// second_list_len > 0 // second_list_len > 0
// We do this check to avoid allocating memory. If the second input // We do this check to avoid allocating memory. If the second input
// list is empty, then we can just return the first list cloned // list is empty, then we can just return the first list cloned
let second_list_empty_comparison = let second_list_length_comparison =
list_is_not_empty(builder, ctx, second_list_len); list_is_not_empty(builder, ctx, second_list_len);
let build_second_list_non_empty_then = || {}; let build_second_list_then = || {
let elem_type = basic_type_from_layout( // Allocate space for the new array that we'll copy into.
env.arena, let elem_type = basic_type_from_layout(
ctx, env.arena,
elem_layout, ctx,
env.ptr_bytes, elem_layout,
); env.ptr_bytes,
);
empty_list(env) let combined_list_len = builder.build_int_add(
first_list_len,
second_list_len,
"add_list_lenghts",
);
let index_name = "#index";
// FIRST LOOP
let first_start_alloca =
builder.build_alloca(ctx.i64_type(), index_name);
let first_index = ctx.i64_type().const_int(0, false);
builder.build_store(first_start_alloca, first_index);
let first_loop_bb =
ctx.append_basic_block(parent, "first_list_append_loop");
builder.build_unconditional_branch(first_loop_bb);
builder.position_at_end(first_loop_bb);
// #index = #index + 1
let curr_first_index = builder
.build_load(first_start_alloca, index_name)
.into_int_value();
let next_first_index = builder.build_int_add(
curr_first_index,
ctx.i64_type().const_int(1, false),
"nextindex",
);
builder.build_store(first_start_alloca, next_first_index);
let ptr_type = get_ptr_type(&elem_type, AddressSpace::Generic);
let first_list_ptr =
load_list_ptr(builder, first_list_wrapper, ptr_type);
// The pointer to the element in the first list
let first_list_elem_ptr = unsafe {
builder.build_in_bounds_gep(
first_list_ptr,
&[curr_first_index],
"load_index",
)
};
// The pointer to the element from the first list
// in the combined list
let first_combined_list_ptr = unsafe {
builder.build_in_bounds_gep(
first_list_ptr,
&[curr_first_index],
"load_index_reversed_list",
)
};
let elem_from_first_list =
builder.build_load(first_list_elem_ptr, "get_elem");
// Mutate the new array in-place to change the element.
builder
.build_store(first_combined_list_ptr, elem_from_first_list);
// #index < first_list_len
let first_loop_end_cond = builder.build_int_compare(
IntPredicate::ULT,
first_list_len,
curr_first_index,
"loopcond",
);
let after_first_loop_bb =
ctx.append_basic_block(parent, "after_first_loop");
builder.build_conditional_branch(
first_loop_end_cond,
first_loop_bb,
after_first_loop_bb,
);
builder.position_at_end(after_first_loop_bb);
// SECOND LOOP
let second_index_name = "#secondindex";
let second_start_alloca =
builder.build_alloca(ctx.i64_type(), second_index_name);
let second_index = ctx.i64_type().const_int(0, false);
builder.build_store(second_start_alloca, second_index);
let second_loop_bb =
ctx.append_basic_block(parent, "second_list_append_loop");
builder.build_unconditional_branch(second_loop_bb);
builder.position_at_end(second_loop_bb);
// #index = #index + 1
let curr_second_index = builder
.build_load(second_start_alloca, second_index_name)
.into_int_value();
let next_second_index = builder.build_int_add(
curr_second_index,
ctx.i64_type().const_int(1, false),
"nextindex",
);
builder.build_store(second_start_alloca, next_second_index);
let ptr_type = get_ptr_type(&elem_type, AddressSpace::Generic);
let second_list_ptr =
load_list_ptr(builder, second_list_wrapper, ptr_type);
// The pointer to the element in the second list
let second_list_elem_ptr = unsafe {
builder.build_in_bounds_gep(
second_list_ptr,
&[curr_second_index],
"load_index",
)
};
// The pointer to the element from the second list
// in the combined list
let second_combined_list_ptr = unsafe {
builder.build_in_bounds_gep(
second_list_ptr,
&[builder.build_int_add(
curr_second_index,
first_list_len,
"second_index_plus_first_list_len",
)],
"load_index_reversed_list",
)
};
let elem_from_second_list =
builder.build_load(second_list_elem_ptr, "get_elem");
// Mutate the new array in-place to change the element.
builder.build_store(
second_combined_list_ptr,
elem_from_second_list,
);
// #index < second_list_len
let second_loop_end_cond = builder.build_int_compare(
IntPredicate::ULT,
second_list_len,
curr_second_index,
"loopcond",
);
let after_second_loop_bb =
ctx.append_basic_block(parent, "after_second_loop");
builder.build_conditional_branch(
second_loop_end_cond,
second_loop_bb,
after_second_loop_bb,
);
builder.position_at_end(after_second_loop_bb);
// END
let combined_list_ptr = env
.builder
.build_array_malloc(
elem_type,
combined_list_len,
"create_combined_list_ptr",
)
.unwrap();
let ptr_bytes = env.ptr_bytes;
let int_type = ptr_int(ctx, ptr_bytes);
let ptr_as_int = builder.build_ptr_to_int(
combined_list_ptr,
int_type,
"list_cast_ptr",
);
let struct_type = collection(ctx, ptr_bytes);
let mut struct_val;
// Store the pointer
struct_val = builder
.build_insert_value(
struct_type.get_undef(),
ptr_as_int,
Builtin::WRAPPER_PTR,
"insert_ptr",
)
.unwrap();
// Store the length
struct_val = builder
.build_insert_value(
struct_val,
combined_list_len,
Builtin::WRAPPER_LEN,
"insert_len",
)
.unwrap();
builder.build_bitcast(
struct_val.into_struct_value(),
collection(ctx, ptr_bytes),
"cast_collection",
)
};
let build_second_list_else = || {
let elem_type = basic_type_from_layout(
env.arena,
ctx,
elem_layout,
env.ptr_bytes,
);
let ptr_type = get_ptr_type(&elem_type, AddressSpace::Generic);
let (new_wrapper, _) = clone_nonempty_list(
env,
first_list_len,
load_list_ptr(builder, first_list_wrapper, ptr_type),
elem_layout,
);
BasicValueEnum::StructValue(new_wrapper)
};
build_basic_phi2(
env,
parent,
second_list_length_comparison,
build_second_list_then,
build_second_list_else,
BasicTypeEnum::StructType(collection(ctx, env.ptr_bytes)),
)
} }
_ => { _ => {
unreachable!( unreachable!(
@ -1937,17 +2175,13 @@ fn run_low_level<'a, 'ctx, 'env>(
} }
}; };
let struct_type = collection(ctx, env.ptr_bytes);
let build_first_list_non_empty_else = || empty_list(env);
build_basic_phi2( build_basic_phi2(
env, env,
parent, parent,
first_list_empty_comparison, first_list_length_comparison,
build_first_list_non_empty_then, build_first_list_then,
build_first_list_non_empty_else, || empty_list(env),
BasicTypeEnum::StructType(struct_type), BasicTypeEnum::StructType(collection(ctx, env.ptr_bytes)),
) )
} }
_ => { _ => {

View file

@ -129,6 +129,13 @@ mod gen_list {
fn list_append() { fn list_append() {
assert_evals_to!("List.append [] []", &[], &'static [i64]); assert_evals_to!("List.append [] []", &[], &'static [i64]);
assert_evals_to!("List.append [ 12, 13 ] []", &[12, 13], &'static [i64]); assert_evals_to!("List.append [ 12, 13 ] []", &[12, 13], &'static [i64]);
assert_evals_to!(
"List.append [ 34 ] [ 44, 55 ]",
&[34, 44, 55],
&'static [i64]
);
// assert_evals_to!("List.append [] [ 23, 24 ]", &[23, 24], &'static [i64]);
// assert_evals_to!( // assert_evals_to!(
// "List.append [ 1, 2 ] [ 3, 4 ]", // "List.append [ 1, 2 ] [ 3, 4 ]",