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generate all static size memcpy's

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Brendan Hansknecht 2024-07-21 17:03:07 -07:00
parent fec875d045
commit f3cae9147c
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1 changed files with 9 additions and 26 deletions
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35
crates/compiler/builtins/bitcode/src/list.zig
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@ -1031,40 +1031,23 @@ pub fn listConcatUtf8(
}
fn copy_element_fn(element_width: usize) CopyFn {
switch (element_width) {
@sizeOf(u8) => {
return memcpy_T(u8);
},
@sizeOf(u16) => {
return memcpy_T(u16);
},
@sizeOf(u32) => {
return memcpy_T(u32);
},
@sizeOf(u64) => {
return memcpy_T(u64);
},
@sizeOf(u128) => {
return memcpy_T(u128);
},
@sizeOf(u256) => {
return memcpy_T(u256);
},
else => {
return &memcpy_opaque;
},
}
const max_inline = @sizeOf(u256);
return switch (element_width) {
inline 0...max_inline => |i| memcpy_sized(i),
else => &memcpy_opaque,
};
}
fn memcpy_opaque(dst: Opaque, src: Opaque, element_width: usize) void {
@memcpy(@as([*]u8, @ptrCast(dst))[0..element_width], @as([*]u8, @ptrCast(src))[0..element_width]);
}
fn memcpy_T(comptime T: type) CopyFn {
fn memcpy_sized(comptime size: usize) CopyFn {
return &(struct {
element_width: usize,
pub fn memcpy(dst: Opaque, src: Opaque, _: usize) void {
@as(*T, @alignCast(@ptrCast(dst))).* = @as(*T, @alignCast(@ptrCast(src))).*;
// due to the memcpy size being known at compile time to zig, llvm can optimize it to not actually be an memcpy call.
// Instead it can inline to direct memory moves.
@memcpy(@as([*]u8, @ptrCast(dst))[0..size], @as([*]u8, @ptrCast(src))[0..size]);
}
}.memcpy);
}