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Tighten recycled search

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This commit is contained in:
Benjamin Feng 2019-12-03 23:49:56 -06:00
parent baffaf7986
commit 01e73bba8d
1 changed files with 9 additions and 18 deletions
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27
lib/std/heap.zig
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@ -280,9 +280,7 @@ const WasmPageAllocator = struct {
}
fn useRecycled(self: *FreeBlock, num_pages: usize) ?[*]u8 {
var found_idx: usize = 0;
var found_size: usize = 0;
@setCold(true);
for (self.block_data) |segment, i| {
const spills_into_next = @bitCast(i128, segment) < 0;
const has_enough_bits = @popCount(u128, segment) >= num_pages;
@ -290,23 +288,16 @@ const WasmPageAllocator = struct {
if (!spills_into_next and !has_enough_bits) continue;
var j: usize = i * 128;
while (j < self.packed_data.int_count) : (j += 1) {
if (self.packed_data.get(j) == 0) {
found_size = 0;
if (j > (i + 1) * 128) {
break;
}
} else {
if (found_size == 0) {
found_idx = j;
}
found_size += 1;
if (found_size >= num_pages) {
self.setBits(found_idx, found_size, 0);
return @intToPtr([*]u8, (found_idx + self.offset) * std.mem.page_size);
while (j < (i + 1) * 128) : (j += 1) {
var count: usize = 0;
while (j + count < self.packed_data.int_count and self.packed_data.get(j + count) == 1) {
count += 1;
if (count >= num_pages) {
self.setBits(j, num_pages, 0);
return @intToPtr([*]u8, (j + self.offset) * std.mem.page_size);
}
}
j += count;
}
}
return null;