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Use SIMD for Zig #128

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Use SIMD for Zig #128

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25 changes: 17 additions & 8 deletions src/leibniz.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -4,17 +4,26 @@ pub fn main() anyerror!void {
var file = try std.fs.cwd().openFile("rounds.txt", .{});
defer file.close();
var buffer: [1024]u8 = undefined;
var n = try file.read(buffer[0..buffer.len]);
var rounds = try std.fmt.parseInt(i64, std.mem.trim(u8, buffer[0..n], "\n"), 10);
rounds += 2;
const n = try file.read(buffer[0..buffer.len]);
const rounds = try std.fmt.parseInt(u32, std.mem.trim(u8, buffer[0..n], "\n"), 10);

const V = @Vector(4, f64);

const sign = V{-1.0,1.0,-1.0,1.0};

var i: usize = 2;
var x: f64 = 1.0;
var pi: f64 = 1.0;
while (i < rounds) : (i += 1) {
x = -x;
pi += (x / @intToFloat(f64, 2 * i - 1));
var i: usize = 0;

while (i < rounds) : (i += 4) {
const div = V{
@floatFromInt(2 * i + 3),
@floatFromInt(2 * i + 5),
@floatFromInt(2 * i + 7),
@floatFromInt(2 * i + 9),
};
pi += @reduce(.Add, sign / div);
}
pi *= 4;

try std.io.getStdOut().writer().print("{}", .{pi});
}