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std.mem.indexOfSentinel: don't ask the OS the page size

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simply use page_size_min instead.

better yet, this logic would avoid depending on page size entirely...
This commit is contained in:
Andrew Kelley 2025-02-23 21:27:51 -08:00 committed by David Rubin
parent e18c7f9cca
commit faf256e429
1 changed files with 3 additions and 3 deletions
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lib/std/mem.zig
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@ -1098,12 +1098,12 @@ pub fn indexOfSentinel(comptime T: type, comptime sentinel: T, p: [*:sentinel]co
// as we don't read into a new page. This should be the case for most architectures
// which use paged memory, however should be confirmed before adding a new arch below.
.aarch64, .x86, .x86_64 => if (std.simd.suggestVectorLength(T)) |block_len| {
const page_size = std.heap.pageSize();
const page_size = std.heap.page_size_min;
const block_size = @sizeOf(T) * block_len;
const Block = @Vector(block_len, T);
const mask: Block = @splat(sentinel);
comptime assert(std.heap.page_size_max % @sizeOf(Block) == 0);
comptime assert(std.heap.page_size_min % @sizeOf(Block) == 0);
assert(page_size % @sizeOf(Block) == 0);
// First block may be unaligned
@ -1153,7 +1153,7 @@ pub fn indexOfSentinel(comptime T: type, comptime sentinel: T, p: [*:sentinel]co
test "indexOfSentinel vector paths" {
const Types = [_]type{ u8, u16, u32, u64 };
const allocator = std.testing.allocator;
const page_size = std.heap.pageSize();
const page_size = std.heap.page_size_min;
inline for (Types) |T| {
const block_len = std.simd.suggestVectorLength(T) orelse continue;