QtCreator freezes when adding a do/while loop in a fragment shader

#version 410 core
out vec4 colorOut;
highp dvec2 center;
highp double zoom = 1000.0;
uniform vec2 winDimensions;
uniform int itr;

vec4 map_to_color(float t) {
    float r = 9.0 * (1.0 - t) * t * t * t;
    float g = 15.0 * (1.0 - t) * (1.0 - t) * t * t;
    float b = 8.5 * (1.0 - t) * (1.0 - t) * (1.0 - t) * t;
    return vec4(r, g, b, 1.0);
}

void main()
{
    center.x = -1.75; 
    center.y = 0.01;     
    highp dvec2 z, c;
    z.x=0.0; z.y=0.0;
    
    double screenRatio = winDimensions.x / winDimensions.y;
    int cnt = 0;
    highp double dimx = 2.0;
    highp double dimy = 2.0;
    highp double distx = 2.0 * dimx;
    highp double disty = 2.0 * dimx;
    highp double tx = 0.0;
    highp double ty = 0.0;
    
    c.x = screenRatio * (-1.0 * dimx + gl_FragCoord.x * distx/winDimensions.x);
    c.y = dimy - gl_FragCoord.y * disty / winDimensions.y;
    c.x /= zoom;
    c.y /= zoom;
    c.x += center.x;
    c.y += center.y;
    
    /*do {
        tx = (z.x*z.x - z.y*z.y) + c.x;
        ty = (2*z.x*z.y) + c.y;
        z.x = tx;
        z.y = ty;
        cnt++;
    } while(tx*tx + ty*ty < 4.0 && cnt != itr); */
    
    cnt = 0;
    double t = double(cnt) / double(itr);
    colorOut = map_to_color(float(t));
}