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MultiArrayList: delete pessimizing vector usage

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By factoring out the comptime parts of this computation, vectors are no
longer useful in this function.
This commit is contained in:
Jacob Young
2023-01-03 00:29:31 -05:00
parent b76fed8206
commit 828ac637b2
1 changed files with 3 additions and 9 deletions
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12
lib/std/multi_array_list.zig
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@@ -433,15 +433,9 @@ pub fn MultiArrayList(comptime S: type) type {
}
fn capacityInBytes(capacity: usize) usize {
if (builtin.zig_backend == .stage2_c) {
var bytes: usize = 0;
for (sizes.bytes) |size| bytes += size * capacity;
return bytes;
} else {
const sizes_vector: @Vector(sizes.bytes.len, usize) = sizes.bytes;
const capacity_vector = @splat(sizes.bytes.len, capacity);
return @reduce(.Add, capacity_vector * sizes_vector);
}
comptime var elem_bytes: usize = 0;
inline for (sizes.bytes) |size| elem_bytes += size;
return elem_bytes * capacity;
}
fn allocatedBytes(self: Self) []align(@alignOf(S)) u8 {