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compiler_rt: don't rely on weak aliases

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This commit is contained in:
Andrew Kelley 2025-01-17 12:53:25 -08:00
parent f278038923
commit 59acfb1263
1 changed files with 10 additions and 6 deletions
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16
lib/compiler_rt/memcpy.zig
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@ -5,19 +5,23 @@ const builtin = @import("builtin");
comptime {
if (builtin.object_format != .c) {
@export(&memcpy, .{ .name = "memcpy", .linkage = common.linkage, .visibility = common.visibility });
@export(&memcpy, .{ .name = "memmove", .linkage = common.linkage, .visibility = common.visibility });
@export(&memmove, .{ .name = "memmove", .linkage = common.linkage, .visibility = common.visibility });
}
}
// a port of https://github.com/facebook/folly/blob/1c8bc50e88804e2a7361a57cd9b551dd10f6c5fd/folly/memcpy.S
pub fn memcpy(maybe_dest: ?[*]u8, maybe_src: ?[*]const u8, len: usize) callconv(.C) ?[*]u8 {
fn memcpy(noalias opt_dest: ?[*]u8, noalias opt_src: ?[*]const u8, len: usize) callconv(.C) ?[*]u8 {
return memmove(opt_dest, opt_src, len);
}
fn memmove(opt_dest: ?[*]u8, opt_src: ?[*]const u8, len: usize) callconv(.C) ?[*]u8 {
// a port of https://github.com/facebook/folly/blob/1c8bc50e88804e2a7361a57cd9b551dd10f6c5fd/folly/memcpy.S
if (len == 0) {
@branchHint(.unlikely);
return maybe_dest;
return opt_dest;
}
const dest = maybe_dest.?;
const src = maybe_src.?;
const dest = opt_dest.?;
const src = opt_src.?;
if (len < 8) {
@branchHint(.unlikely);