1 use crate::alloc::{GlobalAlloc, Layout, System};
5 // The minimum alignment guaranteed by the architecture. This value is used to
6 // add fast paths for low alignment values.
11 target_arch = "powerpc",
12 target_arch = "powerpc64",
13 target_arch = "sparc",
14 target_arch = "asmjs",
15 target_arch = "wasm32",
16 target_arch = "hexagon",
17 target_arch = "riscv32",
18 target_arch = "xtensa"
20 pub const MIN_ALIGN: usize = 8;
22 target_arch = "x86_64",
23 target_arch = "aarch64",
24 target_arch = "mips64",
25 target_arch = "s390x",
26 target_arch = "sparc64",
27 target_arch = "riscv64",
28 target_arch = "wasm64",
30 pub const MIN_ALIGN: usize = 16;
32 pub unsafe fn realloc_fallback(
38 // Docs for GlobalAlloc::realloc require this to be valid:
39 let new_layout = Layout::from_size_align_unchecked(new_size, old_layout.align());
41 let new_ptr = GlobalAlloc::alloc(alloc, new_layout);
42 if !new_ptr.is_null() {
43 let size = cmp::min(old_layout.size(), new_size);
44 ptr::copy_nonoverlapping(ptr, new_ptr, size);
45 GlobalAlloc::dealloc(alloc, ptr, old_layout);