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[benchmarks] Use std.mem.doNotOptimizeAway to avoid data collisions

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This commit is contained in:
Jacob Sandlund
2025-09-06 15:06:00 -04:00
parent 26e9b0a0f3
commit 113e89b389
2 changed files with 5 additions and 18 deletions
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20
src/benchmark/CodepointWidth.zig
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@@ -121,11 +121,7 @@ fn stepWcwidth(ptr: *anyopaque) Benchmark.Error!void {
const cp_, const consumed = d.next(c);
assert(consumed);
if (cp_) |cp| {
const width = wcwidth(cp);
// Write the width to the buffer to avoid it being compiled
// away
buf[0] = @intCast(width);
std.mem.doNotOptimizeAway(wcwidth(cp));
}
}
}
@@ -151,14 +147,10 @@ fn stepTable(ptr: *anyopaque) Benchmark.Error!void {
if (cp_) |cp| {
// This is the same trick we do in terminal.zig so we
// keep it here.
const width = if (cp <= 0xFF)
std.mem.doNotOptimizeAway(if (cp <= 0xFF)
1
else
table.get(@intCast(cp)).width;
// Write the width to the buffer to avoid it being compiled
// away
buf[0] = @intCast(width);
table.get(@intCast(cp)).width);
}
}
}
@@ -182,11 +174,7 @@ fn stepSimd(ptr: *anyopaque) Benchmark.Error!void {
const cp_, const consumed = d.next(c);
assert(consumed);
if (cp_) |cp| {
const width = simd.codepointWidth(cp);
// Write the width to the buffer to avoid it being compiled
// away
buf[0] = @intCast(width);
std.mem.doNotOptimizeAway(simd.codepointWidth(cp));
}
}
}

3
src/benchmark/GraphemeBreak.zig
View File

@@ -126,8 +126,7 @@ fn stepTable(ptr: *anyopaque) Benchmark.Error!void {
const cp_, const consumed = d.next(c);
assert(consumed);
if (cp_) |cp2| {
const v = unicode.graphemeBreak(cp1, @intCast(cp2), &state);
buf[0] = @intCast(@intFromBool(v));
std.mem.doNotOptimizeAway(unicode.graphemeBreak(cp1, @intCast(cp2), &state));
cp1 = cp2;
}
}