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Replaced a sing with std.mem.doNotOptimizeAway

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adrien 2026-04-22 00:12:38 +02:00
parent fb922e3d5c
commit d96a1ac4bc
1 changed files with 21 additions and 21 deletions
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42
src/benchmark.zig
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@ -6,6 +6,9 @@ const Vector = @import("Vector.zig").Vector;
var io: Io = undefined; var io: Io = undefined;
pub fn main(init: std.process.Init) !void { pub fn main(init: std.process.Init) !void {
const zone = tracy.ZoneN(@src(), "Main Loop");
defer zone.End();
var stdout_buf: [4096]u8 = undefined; var stdout_buf: [4096]u8 = undefined;
var stdout_writer: std.Io.File.Writer = .init(.stdout(), init.io, &stdout_buf); var stdout_writer: std.Io.File.Writer = .init(.stdout(), init.io, &stdout_buf);
try stdout_writer.interface.print("Starting Benchmarks...", .{}); try stdout_writer.interface.print("Starting Benchmarks...", .{});
@ -20,6 +23,8 @@ pub fn main(init: std.process.Init) !void {
try stdout_writer.flush(); try stdout_writer.flush();
try bench_Vector(&stdout_writer.interface); try bench_Vector(&stdout_writer.interface);
try stdout_writer.flush(); try stdout_writer.flush();
tracy.FrameMark();
} }
fn getTime() Io.Timestamp { fn getTime() Io.Timestamp {
@ -37,8 +42,6 @@ fn bench_Scalar(writer: *std.Io.Writer) !void {
const ITERS: usize = 100_000; const ITERS: usize = 100_000;
const SAMPLES: usize = 10; const SAMPLES: usize = 10;
var gsink: f64 = 0;
const getVal = struct { const getVal = struct {
fn f(comptime TT: type, i: usize, comptime mask: u7) TT { fn f(comptime TT: type, i: usize, comptime mask: u7) TT {
const v: u8 = @as(u8, @truncate(i & @as(usize, mask))) + 1; const v: u8 = @as(u8, @truncate(i & @as(usize, mask))) + 1;
@ -97,29 +100,29 @@ fn bench_Scalar(writer: *std.Io.Writer) !void {
var samples: [SAMPLES]f64 = undefined; var samples: [SAMPLES]f64 = undefined;
for (0..SAMPLES) |s_idx| { for (0..SAMPLES) |s_idx| {
var sink: T = 0;
const t_start = getTime(); const t_start = getTime();
for (0..ITERS) |i| { for (0..ITERS) |i| {
const r = if (comptime std.mem.eql(u8, op_name, "add")) std.mem.doNotOptimizeAway(
(M{ .value = getVal(T, i, 63) }).add(M{ .value = getVal(T, i +% 7, 63) }) {
else if (comptime std.mem.eql(u8, op_name, "sub")) _ = if (comptime std.mem.eql(u8, op_name, "add"))
(M{ .value = getVal(T, i +% 10, 63) }).sub(M{ .value = getVal(T, i, 63) }) (M{ .value = getVal(T, i, 63) }).add(M{ .value = getVal(T, i +% 7, 63) })
else if (comptime std.mem.eql(u8, op_name, "mulBy")) else if (comptime std.mem.eql(u8, op_name, "sub"))
(M{ .value = getVal(T, i, 63) }).mulBy(M{ .value = getVal(T, i +% 1, 63) }) (M{ .value = getVal(T, i +% 10, 63) }).sub(M{ .value = getVal(T, i, 63) })
else if (comptime std.mem.eql(u8, op_name, "divBy")) else if (comptime std.mem.eql(u8, op_name, "mulBy"))
(M{ .value = getVal(T, i +% 10, 63) }).divBy(S{ .value = getVal(T, i, 63) }) (M{ .value = getVal(T, i, 63) }).mulBy(M{ .value = getVal(T, i +% 1, 63) })
else if (comptime std.mem.eql(u8, op_name, "scale")) else if (comptime std.mem.eql(u8, op_name, "divBy"))
(M{ .value = getVal(T, i, 63) }).scale(getVal(T, i +% 2, 63)) (M{ .value = getVal(T, i +% 10, 63) }).divBy(S{ .value = getVal(T, i, 63) })
else else if (comptime std.mem.eql(u8, op_name, "scale"))
(KM{ .value = getVal(T, i, 15) }).to(M); (M{ .value = getVal(T, i, 63) }).scale(getVal(T, i +% 2, 63))
else
if (comptime @typeInfo(T) == .float) sink += r.value else sink ^= r.value; (KM{ .value = getVal(T, i, 15) }).to(M);
},
);
} }
const t_end = getTime(); const t_end = getTime();
samples[s_idx] = @as(f64, @floatFromInt(t_start.durationTo(t_end).toNanoseconds())); samples[s_idx] = @as(f64, @floatFromInt(t_start.durationTo(t_end).toNanoseconds()));
fold(T, &gsink, sink);
} }
const stats = computeStats(&samples, ITERS); const stats = computeStats(&samples, ITERS);
@ -152,9 +155,6 @@ fn bench_Scalar(writer: *std.Io.Writer) !void {
} }
try writer.print("└──────────────┴───────┴───────┴───────┴───────┴───────┴───────┴───────┴───────┘\n", .{}); try writer.print("└──────────────┴───────┴───────┴───────┴───────┴───────┴───────┴───────┴───────┘\n", .{});
try writer.print("\nAnti-optimisation sink: {d:.4}\n", .{gsink});
try std.testing.expect(gsink != 0);
} }
fn bench_vsNative(writer: *std.Io.Writer) !void { fn bench_vsNative(writer: *std.Io.Writer) !void {