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Inline align forward offset code

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This commit is contained in:
gingerBill
2022-10-12 20:28:51 +01:00
parent 6642e1fc9d
commit b84108c4b5
1 changed files with 7 additions and 12 deletions
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core/mem/virtual/arena.odin
+7 -12
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@@ -44,23 +44,18 @@ arena_init_static :: proc(arena: ^Arena, reserved: uint, commit_size: uint = STA
}
arena_alloc :: proc(arena: ^Arena, min_size: int, alignment: int, loc := #caller_location) -> (data: []byte, err: Allocator_Error) {
align_forward_offset :: proc "contextless" (arena: ^Arena, alignment: int) -> uint #no_bounds_check {
alignment_offset := uint(0)
ptr := uintptr(arena.curr_block.base[arena.curr_block.used:])
mask := uintptr(alignment-1)
if ptr & mask != 0 {
alignment_offset = uint(alignment) - uint(ptr & mask)
}
return alignment_offset
}
assert(mem.is_power_of_two(uintptr(alignment)), "non-power of two alignment", loc)
switch arena.kind {
case .Growing:
size := uint(0)
size := uint(min_size)
if arena.curr_block != nil {
size = uint(min_size) + align_forward_offset(arena, alignment)
// align forward offset
ptr := uintptr(arena.curr_block.base[arena.curr_block.used:])
mask := uintptr(alignment-1)
if ptr & mask != 0 {
size += uint(alignment) - uint(ptr & mask)
}
}
if arena.curr_block == nil || arena.curr_block.used + size > arena.curr_block.reserved {