mandelbrot Swift #8 program

/* The Computer Language Benchmarks Game
   https://salsa.debian.org/benchmarksgame-team/benchmarksgame/

   line-by-line from Greg Buchholz's C program
*/

import Glibc


func main() 
{
    var w, h: Int; var bit_num = 0
    var byte_acc: Int32 = 0   
    var i: Int; let iter = 50  
    let limit = 2.0
    var Zr, Zi, Cr, Ci, Tr, Ti: Double

    h = Int(CommandLine.arguments[1])! ; w = h
    
    print("P4\n\(w) \(h)")
    
    for y in 0..<h 
    {
        for x in 0..<w 
        {
            Zr = 0.0; Zi = 0.0; Tr = 0.0; Ti = 0.0
            Cr = (2.0*Double(x)/Double(w) - 1.5)
            Ci=(2.0*Double(y)/Double(h) - 1.0)  
            i = 0 ; while i < iter && (Tr+Ti <= limit*limit) 
            {   i += 1 
                Zi = 2.0*Zr*Zi + Ci
                Zr = Tr - Ti + Cr
                Tr = Zr * Zr
                Ti = Zi * Zi  
            }
    
            byte_acc <<= 1
            if Tr+Ti <= limit*limit { byte_acc |= 0x01 }
            
            bit_num += 1     
            
            if bit_num == 8 
            {
                putc(byte_acc,stdout) // Glibc
                byte_acc = 0
                bit_num = 0
            }
            else if x == w-1 
            {
                byte_acc <<= (8-w%8)
                putc(byte_acc,stdout) // Glibc
                byte_acc = 0
                bit_num = 0
            }            
        }
    }	
}

main()
    

NOTES:
64-bit Ubuntu quad core
Swift version 6.0
(swift-6.0-RELEASE)
Target: x86_64-unknown-linux-gnu


 Thu, 07 Nov 2024 20:52:12 GMT

MAKE:
/opt/src/swift-6.0-RELEASE/usr/bin/swiftc mandelbrot.swift-8.swift -Ounchecked -wmo  -o mandelbrot.swift-8.swift_run

14.32s to complete and log all make actions

COMMAND LINE:
 ./mandelbrot.swift-8.swift_run 16000

(BINARY) PROGRAM OUTPUT NOT SHOWN