v8/test/mjsunit/deopt-with-fp-regs.js

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// Flags: --allow-natives-syntax --opt --no-always-opt

deopt_trigger = 0;
side_effect = 0;

function test(a, b, c, d, e, v) {
  // This test expects some specific input values.
  assertEquals(10.0, a);
  assertEquals(20.0, b);
  assertEquals(30.0, c);
  assertEquals(40.0, d);
  assertEquals(50.0, e);
  assertEquals(1.5, v);

  // Perform a few double calculations.
  a = a * 0.1;
  b = b * 0.2;
  c = c * 0.3;
  d = d * 0.4;
  e = e * 0.5;

  // Write to a field of a global object. As for any side effect, a HSimulate
  // will be introduced after the instructions to support this. If we deopt
  // later in this function, the execution will resume in full-codegen after
  // this point.
  side_effect++;
  // The following field of the global object will be deleted to force a deopt.
  // If we use type feedback to deopt, then tests ran with --stress-opt will
  // not deopt after a few iteration.
  // If we use %DeoptimizeFunction, all values will be on the frame due to the
  // call and we will not exercise the translation mechanism handling fp
  // registers.
  deopt_trigger = v;

  // Do a few more calculations using the previous values after our deopt point
  // so the floating point registers which hold those values are recorded in the
  // environment and will be used during deoptimization.
  a = a * v;
  b = b * v;
  c = c * v;
  d = d * v;
  e = e * v;

  // Check that we got the expected results.
  assertEquals(1.5,  a);
  assertEquals(6,    b);
  assertEquals(13.5, c);
  assertEquals(24,   d);
  assertEquals(37.5, e);
}
%PrepareFunctionForOptimization(test);


test(10.0, 20.0, 30.0, 40.0, 50.0, 1.5);
test(10.0, 20.0, 30.0, 40.0, 50.0, 1.5);
%OptimizeFunctionOnNextCall(test);
test(10.0, 20.0, 30.0, 40.0, 50.0, 1.5);
assertOptimized(test);

// By deleting the field we are forcing the code to deopt when the field is
// read on next execution.
delete deopt_trigger;
test(10.0, 20.0, 30.0, 40.0, 50.0, 1.5);
assertUnoptimized(test);