v8/test/mjsunit/compiler/deopt-materialize-accumulator.js

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// Flags: --allow-natives-syntax
//
// Tests that Turbofan correctly materializes values which are in the
// interpreters accumulator during deopt.

var global = 3;
function f(a) {
  // This will trigger a deopt since global was previously a SMI, with the
  // accumulator holding an unboxed double which needs materialized.
  global = Math.sqrt(a);
}
%PrepareFunctionForOptimization(f);
%OptimizeFunctionOnNextCall(f);
f(0.25);
assertEquals(0.5, global);