Version 3.20.15

test/mjsunit/unary-minus-deopt.js

-// Copyright 2013 the V8 project authors. All rights reserved.
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-// modification, are permitted provided that the following conditions are
-// met:
-//
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-//     * Redistributions in binary form must reproduce the above
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-//       contributors may be used to endorse or promote products derived
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-
-// Flags: --allow-natives-syntax
-
-// This is a boiled-down example happening in the Epic Citadel demo:
-// After deopting, the multiplication for unary minus stayed in Smi
-// mode instead of going to double mode, leading to deopt loops.
-
-function unaryMinusTest(x) {
-  var g = (1 << x) | 0;
-  // Optimized code will contain a LMulI with -1 as right operand.
-  return (g & -g) - 1 | 0;
-}
-
-unaryMinusTest(3);
-unaryMinusTest(3);
-%OptimizeFunctionOnNextCall(unaryMinusTest);
-unaryMinusTest(3);
-assertOptimized(unaryMinusTest);
-
-// Deopt on kMinInt
-unaryMinusTest(31);
-// The following is normally true, but not with --stress-opt. :-/
-// assertUnoptimized(unaryMinusTest);
-
-// We should have learned something from the deopt.
-unaryMinusTest(31);
-%OptimizeFunctionOnNextCall(unaryMinusTest);
-unaryMinusTest(31);
-assertOptimized(unaryMinusTest);