tests/stress/ftl-to-ftl-arity-fixup.js

   1 function foo(a, b, c) {
   2     return (a|0) + (b|0) + (c|0);
   3 }
   4
   5 function bar(o) {
   6     // Save a bunch of state in local variables.
   7     var a = o.f;
   8     var b = o.g;
   9     var c = o.h;
  10     var d = o.i;
  11     var e = o.j;
  12     var f = o.k;
  13     var g = o.l;
  14     // Make a call that will be subject to arity fixup and then use the saved state. We're
  15     // counting on LLVM to put those variables in callee-saves, since that's pretty much the
  16     // only sensible choice.
  17     return foo(42) + a + b + c + d + e + f + g;
  18 }
  19
  20 noInline(foo);
  21 noInline(bar);
  22
  23 for (var i = 0; i < 100000; ++i) {
  24     // Call bar() in such a way that all of those callee-save variables have fairly unique
  25     // looking values, to maximize the chances of foo() clobbering them in a recognizable
  26     // way.
  27     var result = bar({
  28         f:i * 3, g:i - 1, h:(i / 2)|0, i:-i, j:13 + ((i / 5)|0), k:14 - ((i / 6)|0),
  29         l:1 - i});
  30
  31     var expected = 42 + i * 3 + i - 1 + ((i / 2)|0) - i + 13 + ((i / 5)|0) + 14 -
  32         ((i / 6)|0) + 1 - i;
  33
  34     if (result != expected)
  35         throw "Error: for iteration " + i + " expected " + expected + " but got " + result;
  36 }