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PR tidy-ups

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This commit is contained in:
Brian Carroll 2021-09-28 23:16:34 +01:00
parent 93448182e4
commit 7ea59ad9d4
5 changed files with 41 additions and 29 deletions
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12
compiler/gen_wasm/src/lib.rs
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@ -155,12 +155,20 @@ fn copy_memory(
Ok(())
}
/// Round up to alignment_bytes (assumed to be a power of 2)
pub fn round_up_to_alignment(unaligned: i32, alignment_bytes: i32) -> i32 {
let mut aligned = unaligned;
aligned += alignment_bytes - 1; // if lower bits are non-zero, push it over the next boundary
aligned &= -alignment_bytes; // mask with a flag that has upper bits 1, lower bits 0
aligned
}
pub fn allocate_stack_frame(
instructions: &mut Vec<Instruction>,
size: i32,
local_frame_pointer: LocalId,
) {
let aligned_size = (size + STACK_ALIGNMENT_BYTES - 1) & (-STACK_ALIGNMENT_BYTES);
let aligned_size = round_up_to_alignment(size, STACK_ALIGNMENT_BYTES);
instructions.extend([
GetGlobal(STACK_POINTER_GLOBAL_ID),
I32Const(aligned_size),
@ -175,7 +183,7 @@ pub fn free_stack_frame(
size: i32,
local_frame_pointer: LocalId,
) {
let aligned_size = (size + STACK_ALIGNMENT_BYTES - 1) & (-STACK_ALIGNMENT_BYTES);
let aligned_size = round_up_to_alignment(size, STACK_ALIGNMENT_BYTES);
instructions.extend([
GetLocal(local_frame_pointer.0),
I32Const(aligned_size),