T0b1/wasmtime
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Add a JumpTableData::with_capacity and use it.

Browse Source 
As with Vec::with_capacity, this helps reduce intermediate heap allocation.
This commit is contained in:
Dan Gohman
2017-09-10 16:17:03 -07:00
parent 620f1f49e2
commit 47bc963ba5
2 changed files with 10 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
lib/wasm/src/code_translator.rs
View File

@@ -364,7 +364,7 @@ pub fn translate_operator<FE: FuncEnvironment + ?Sized>(
if jump_args_count == 0 {
// No jump arguments
let val = state.pop1();
let mut data = JumpTableData::new();
let mut data = JumpTableData::with_capacity(depths.len());
for depth in depths {
let i = state.control_stack.len() - 1 - (depth as usize);
let frame = &mut state.control_stack[i];
@@ -385,7 +385,7 @@ pub fn translate_operator<FE: FuncEnvironment + ?Sized>(
// We then proceed to split the edges going out of the br_table
let val = state.pop1();
let cut_index = state.stack.len() - jump_args_count;
let mut data = JumpTableData::new();
let mut data = JumpTableData::with_capacity(depths.len());
let dest_ebbs: HashMap<usize, Ebb> = depths.iter().fold(HashMap::new(), |mut acc,
&depth| {
if acc.get(&(depth as usize)).is_none() {