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deps/v8/test/mjsunit/turboshaft/maglev-frontend/holey-float64-phi-to-smi.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 --no-maglev-loop-peeling
+
+// Creating an object with 2 Smi fields.
+let o = { x : 42, y : 19 };
+
+// Making {o}'s fields non-const.
+o.x = 43;
+o.y = 20;
+
+let holey_double_arr = [ -0.0, 2.2, , 4.4 ];
+
+function foo(x, y) {
+  let holey_f64_1 = holey_double_arr[0];
+  let phi_1 = holey_f64_1; // HoleyFloat64 input to the phi
+  for (let i = 0.5; i < x; i += 1) {
+    i += phi_1; // Float64 use to the phi
+    phi_1 = 51; // Smi input to the phi
+  }
+  o.x = phi_1;
+
+  let holey_f64_2 = holey_double_arr[1];
+  let phi_2 = holey_f64_2; // HoleyFloat64 input to the phi
+  for (let i = 0.5; i < y; i += 1) {
+    i += phi_2; // Float64 use to the phi
+    phi_2 = 40; // Smi input to the phi
+  }
+  o.y = phi_2;
+}
+
+%PrepareFunctionForOptimization(foo);
+foo(4, 5);
+assertEquals({x : 51, y : 40}, o);
+
+%OptimizeFunctionOnNextCall(foo);
+foo(4, 5);
+assertEquals({x : 51, y : 40}, o);
+assertOptimized(foo);
+
+// Triggering a deopt because of -0.0
+foo(0, 5);
+assertEquals({x : -0.0, y : 40}, o);
+assertSame(o.x, -0.0);
+assertUnoptimized(foo);
+
+%OptimizeFunctionOnNextCall(foo);
+foo(4, 5);
+assertEquals({x : 51, y : 40}, o);
+assertOptimized(foo);
+
+// Triggering deopt because of regular non-smi float64
+foo(4, 0);
+assertEquals({x : 51, y : 2.2}, o);
+assertUnoptimized(foo);