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compiler-rt: reduce memmove and memcpy size for ReleaseSmall

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This commit is contained in:
dweiller 2025-01-20 17:27:50 +11:00
parent bf89482f23
commit d6e1166f1a
2 changed files with 49 additions and 4 deletions
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23
lib/compiler_rt/memcpy.zig
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@ -4,10 +4,29 @@ const builtin = @import("builtin");
comptime { comptime {
if (builtin.object_format != .c) { if (builtin.object_format != .c) {
@export(&memcpy, .{ .name = "memcpy", .linkage = common.linkage, .visibility = common.visibility }); const export_options: std.builtin.ExportOptions = .{
.name = "memcpy",
.linkage = common.linkage,
.visibility = common.visibility,
};
if (builtin.mode == .ReleaseSmall)
@export(&memcpySmall, export_options)
else
@export(&memcpyFast, export_options);
} }
} }
fn memcpy(opt_dest: ?[*]u8, opt_src: ?[*]const u8, len: usize) callconv(.C) ?[*]u8 { fn memcpySmall(noalias dest: ?[*]u8, noalias src: ?[*]const u8, len: usize) callconv(.C) ?[*]u8 {
@setRuntimeSafety(builtin.is_test);
for (0..len) |i| {
dest.?[i] = src.?[i];
}
return dest;
}
fn memcpyFast(opt_dest: ?[*]u8, opt_src: ?[*]const u8, len: usize) callconv(.C) ?[*]u8 {
return @call(.always_inline, @import("memmove.zig").memmove, .{ opt_dest, opt_src, len }); return @call(.always_inline, @import("memmove.zig").memmove, .{ opt_dest, opt_src, len });
} }

30
lib/compiler_rt/memmove.zig
View File

@ -4,11 +4,37 @@ const builtin = @import("builtin");
comptime { comptime {
if (builtin.object_format != .c) { if (builtin.object_format != .c) {
@export(&memmove, .{ .name = "memmove", .linkage = common.linkage, .visibility = common.visibility }); const export_options: std.builtin.ExportOptions = .{
.name = "memmove",
.linkage = common.linkage,
.visibility = common.visibility,
};
if (builtin.mode == .ReleaseSmall)
@export(&memmoveSmall, export_options)
else
@export(&memmoveFast, export_options);
} }
} }
pub fn memmove(opt_dest: ?[*]u8, opt_src: ?[*]const u8, len: usize) callconv(.C) ?[*]u8 { fn memmoveSmall(opt_dest: ?[*]u8, opt_src: ?[*]const u8, len: usize) callconv(.C) ?[*]u8 {
const dest = opt_dest.?;
const src = opt_src.?;
if (@intFromPtr(dest) < @intFromPtr(src)) {
for (0..len) |i| {
dest[i] = src[i];
}
} else {
for (0..len) |i| {
dest[len - 1 - i] = src[len - 1 - i];
}
}
return dest;
}
pub fn memmoveFast(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 // a port of https://github.com/facebook/folly/blob/1c8bc50e88804e2a7361a57cd9b551dd10f6c5fd/folly/memcpy.S
if (len == 0) { if (len == 0) {
@branchHint(.unlikely); @branchHint(.unlikely);