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std.fmt.digits2: optimize for ReleaseSmall

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Difference:
```
$ cat x.zig
const std = @import("std");

pub const std_options = std.Options{ .keep_sigpipe = true };

pub fn main() void {
    std.io.getStdOut().writer().print("{d}\n", .{@intFromPtr(std.os.argv.ptr)}) catch {};
}
$ zig build-exe x.zig -OReleaseSmall -fsingle-threaded -fno-unwind-tables && wc -c x
2576 x
$ zig build-exe x.zig -OReleaseSmall -fsingle-threaded -fno-unwind-tables --zig-lib-dir ../zig/lib && wc -c x
2424 x
```
This commit is contained in:
wooster0 2025-02-12 11:14:12 +09:00 committed by Andrew Kelley
parent de8741271f
commit 5b9b5e45cb
1 changed files with 7 additions and 3 deletions
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10
lib/std/fmt.zig
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@ -1252,9 +1252,13 @@ pub fn formatIntBuf(out_buf: []u8, value: anytype, base: u8, case: Case, options
return fbs.pos; return fbs.pos;
} }
// Converts values in the range [0, 100) to a string. /// Converts values in the range [0, 100) to a base 10 string.
pub fn digits2(value: usize) [2]u8 { pub fn digits2(value: u8) [2]u8 {
return "00010203040506070809101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899"[value * 2 ..][0..2].*; if (builtin.mode == .ReleaseSmall) {
return .{ @intCast('0' + value / 10), @intCast('0' + value % 10) };
} else {
return "00010203040506070809101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899"[value * 2 ..][0..2].*;
}
} }
const FormatDurationData = struct { const FormatDurationData = struct {