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optimize memory.grow 0 (#443)

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vms
2019-10-25 01:56:04 +03:00
committed by Dan Gohman
parent 5a10879d5b
commit a34439de42
1 changed files with 5 additions and 0 deletions
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5
wasmtime-runtime/src/memory.rs
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@@ -80,6 +80,11 @@ impl LinearMemory {
/// Returns `None` if memory can't be grown by the specified amount /// Returns `None` if memory can't be grown by the specified amount
/// of wasm pages. /// of wasm pages.
pub fn grow(&mut self, delta: u32) -> Option<u32> { pub fn grow(&mut self, delta: u32) -> Option<u32> {
// Optimization of memory.grow 0 calls.
if delta == 0 {
return Some(self.current);
}
let new_pages = match self.current.checked_add(delta) { let new_pages = match self.current.checked_add(delta) {
Some(new_pages) => new_pages, Some(new_pages) => new_pages,
// Linear memory size overflow. // Linear memory size overflow.