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deps/v8/test/mjsunit/turboshaft/maglev-frontend/holey-float64-phi-deopt.js

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+// Copyright 2024 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --allow-natives-syntax --turbolev --turbofan
+// Flags: --no-always-turbofan
+
+function foo(arr, x) {
+  let sum = 0;
+  let v = 4.65; // {v} will be a HoleyFloat64 Phi
+  for (let i = 0; i < 10; i++) {
+    sum += v; // This is a Float64 use of {v} to ensures that it gets untagged.
+    v = arr[i]; // HoleyFloat64 input to {v}.
+  }
+  // {v} is now a Float64 hole (because arr[9] is a hole).
+
+  // This addition will have Smi feedback, and we'll make it deopt by overflow
+  // Smi range. {v} will be passed in the FrameState. If it's marked as Float64
+  // MachineRepresentation in the FrameState, then the deoptimizer will
+  // materialize a NaN HeapNumber for it, which is wrong. It should instead have
+  // HoleyFloat64 MachineRepresentation, and be materialized by the deoptimizer
+  // as Undefined.
+  let xtimes10 = x * 10;
+
+  // We mainly care about returning {v} here, but we're also returning the other
+  // things so that they aren't dead and optimized out.
+  return [ sum, v, xtimes10 ];
+}
+
+let arr = [0.0, 1.1, 2.2, 3.3, 4.4, 5.5, 6.6, 7.7, 8.8, /*hole*/, 9.9,
+           10.10, 11.11, 12.12, 13.13, 14.14];
+
+%PrepareFunctionForOptimization(foo);
+assertEquals(undefined, foo(arr, 42)[1]);
+
+%OptimizeFunctionOnNextCall(foo);
+assertEquals(undefined, foo(arr, 42)[1]);
+
+// We'll now trigger a deopt.
+assertEquals(undefined, foo(arr, 1000000000)[1]);