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empty_list helper

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This commit is contained in:
Chad Stearns 2020-06-21 14:03:04 -04:00
parent 10aa44e12b
commit 9376b4b988
1 changed files with 12 additions and 15 deletions
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27
compiler/gen/src/llvm/build.rs
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@ -433,11 +433,7 @@ pub fn build_expr<'a, 'ctx, 'env>(
let builder = env.builder;
if elems.is_empty() {
let struct_type = collection(ctx, env.ptr_bytes);
// The pointer should be null (aka zero) and the length should be zero,
// so the whole struct should be a const_zero
BasicValueEnum::StructValue(struct_type.const_zero())
empty_list(env)
} else {
let len_u64 = elems.len() as u64;
let elem_bytes = elem_layout.stack_size(env.ptr_bytes) as u64;
@ -1582,16 +1578,7 @@ fn call_with_args<'a, 'ctx, 'env>(
)
};
// If the number of repeats is 0 or lower, dont even
// bother allocating memory, since that it a costly
// operation. Just return an empty list.
let build_else = || {
let struct_type = collection(ctx, env.ptr_bytes);
// The pointer should be null (aka zero) and the length should be zero,
// so the whole struct should be a const_zero
BasicValueEnum::StructValue(struct_type.const_zero())
};
let build_else = || empty_list(env);
let struct_type = collection(ctx, env.ptr_bytes);
@ -1770,6 +1757,16 @@ enum InPlace {
Clone,
}
fn empty_list<'a, 'ctx, 'env>(env: &Env<'a, 'ctx, 'env>) -> BasicValueEnum<'ctx> {
let ctx = env.context;
let struct_type = collection(ctx, env.ptr_bytes);
// The pointer should be null (aka zero) and the length should be zero,
// so the whole struct should be a const_zero
BasicValueEnum::StructValue(struct_type.const_zero())
}
fn bounds_check_comparison<'ctx>(
builder: &Builder<'ctx>,
elem_index: IntValue<'ctx>,