45 lines
1.3 KiB
Zig
45 lines
1.3 KiB
Zig
const builtin = @import("builtin");
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const std = @import("std");
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pub fn main() !void {
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const stdout = std.io.getStdOut().outStream();
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const args = try std.process.argsAlloc(std.heap.page_allocator);
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// Warm up runs
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var buffer0: [32767]u16 align(4096) = undefined;
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_ = try std.unicode.utf8ToUtf16Le(&buffer0, args[1]);
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_ = try std.unicode.utf8ToUtf16Le_better(&buffer0, args[1]);
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@fence(.SeqCst);
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var timer = try std.time.Timer.start();
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@fence(.SeqCst);
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var buffer1: [32767]u16 align(4096) = undefined;
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_ = try std.unicode.utf8ToUtf16Le(&buffer1, args[1]);
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@fence(.SeqCst);
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const elapsed_ns_orig = timer.lap();
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@fence(.SeqCst);
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var buffer2: [32767]u16 align(4096) = undefined;
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_ = try std.unicode.utf8ToUtf16Le_better(&buffer2, args[1]);
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@fence(.SeqCst);
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const elapsed_ns_better = timer.lap();
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@fence(.SeqCst);
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std.debug.warn("original utf8ToUtf16Le: elapsed: {} ns ({} ms)\n", .{
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elapsed_ns_orig, elapsed_ns_orig / 1000000,
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});
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std.debug.warn("new utf8ToUtf16Le: elapsed: {} ns ({} ms)\n", .{
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elapsed_ns_better, elapsed_ns_better / 1000000,
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});
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asm volatile ("nop"
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:
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: [a] "r" (&buffer1),
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[b] "r" (&buffer2)
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: "memory"
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);
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}
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