blob: 3cd46a4e8476294ba27766b865c0029142158b77 [file] [log] [blame]
// Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
// @dart = 2.9
// Test that the ParalleMoveResolver in the VM uses valid registers
// when requiring scratch registers.
main() {
// Iterate enough to ensure optimizing `spillingMethod`.
for (int i = 0; i < 100000; i++) {
spillingMethod(i, () => 0);
}
}
spillingMethod(what, obfuscate) {
// Define lots of variables to get a few in stack.
var a = obfuscate();
var b = obfuscate();
var c = obfuscate();
var d = obfuscate();
var e = obfuscate();
var f = obfuscate();
var g = obfuscate();
var h = obfuscate();
var i = obfuscate();
var j = obfuscate();
var k = obfuscate();
var l = obfuscate();
var m = obfuscate();
var n = obfuscate();
var o = obfuscate();
var p = obfuscate();
var q = obfuscate();
var r = obfuscate();
var s = obfuscate();
var t = obfuscate();
var u = obfuscate();
var v = obfuscate();
// Swap all variables, in the hope of a memory <-> memory swap operation.
while (what == 42) {
a = b;
b = a;
c = d;
d = c;
e = f;
f = e;
g = h;
h = g;
i = j;
j = i;
k = l;
l = k;
m = n;
n = m;
o = p;
p = o;
q = r;
r = q;
s = t;
t = s;
u = v;
v = u;
what++;
}
// Keep all variables alive.
return a +
b +
c +
d +
e +
f +
g +
h +
i +
j +
k +
l +
m +
n +
o +
p +
q +
r +
s +
t +
u +
v;
}