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optimize zig code

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This commit is contained in:
Folkert 2021-05-23 15:58:08 +02:00
parent 53871317d5
commit a4ed13d714
4 changed files with 114 additions and 15 deletions
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48
compiler/builtins/bitcode/src/utils.zig
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@ -6,7 +6,7 @@ pub const IncN = fn (?[*]u8, u64) callconv(.C) void;
pub const Dec = fn (?[*]u8) callconv(.C) void;
const REFCOUNT_MAX_ISIZE: comptime isize = 0;
const REFCOUNT_ONE_ISIZE: comptime isize = std.math.minInt(isize);
pub const REFCOUNT_ONE_ISIZE: comptime isize = std.math.minInt(isize);
pub const REFCOUNT_ONE: usize = @bitCast(usize, REFCOUNT_ONE_ISIZE);
pub const IntWidth = enum(u8) {
@ -144,6 +144,52 @@ pub fn allocateWithRefcount(
}
}
pub fn mallocWithRefcount(
alignment: usize,
data_bytes: usize,
) [*]u8 {
comptime const result_in_place = false;
switch (alignment) {
16 => {
const length = 2 * @sizeOf(usize) + data_bytes;
var new_bytes: [*]align(16) u8 = @ptrCast([*]u8, @alignCast(16, std.c.malloc(length)));
var as_usize_array = @ptrCast([*]usize, new_bytes);
if (result_in_place) {
as_usize_array[0] = 0;
as_usize_array[1] = @intCast(usize, number_of_slots);
} else {
as_usize_array[0] = 0;
as_usize_array[1] = REFCOUNT_ONE;
}
var as_u8_array = @ptrCast([*]u8, new_bytes);
const first_slot = as_u8_array + 2 * @sizeOf(usize);
return first_slot;
},
else => {
const length = @sizeOf(usize) + data_bytes;
var new_bytes: [*]align(8) u8 = @ptrCast([*]u8, @alignCast(8, std.c.malloc(length)));
var as_usize_array = @ptrCast([*]isize, new_bytes);
if (result_in_place) {
as_usize_array[0] = @intCast(isize, number_of_slots);
} else {
as_usize_array[0] = REFCOUNT_ONE_ISIZE;
}
var as_u8_array = @ptrCast([*]u8, new_bytes);
const first_slot = as_u8_array + @sizeOf(usize);
return first_slot;
},
}
}
pub fn unsafeReallocate(
source_ptr: [*]u8,
allocator: *Allocator,