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+---
+title: Math.imul()
+slug: Web/JavaScript/Reference/Global_Objects/Math/imul
+tags:
+  - JavaScript
+  - Math
+  - Method
+  - Reference
+translation_of: Web/JavaScript/Reference/Global_Objects/Math/imul
+---
+<div>{{JSRef}}</div>
+
+<p><strong><code>Math.imul()</code></strong> 함수는 C 언어와 같은 양식으로 2개 파라메터의 32-bit 곱셈 결과를 리턴합니다.</p>
+
+<h2 id="문법">문법</h2>
+
+<pre class="syntaxbox"><code>Math.imul(<var>a</var>, <var>b</var>)</code></pre>
+
+<h3 id="파라메터">파라메터</h3>
+
+<dl>
+ <dt><code>a</code></dt>
+ <dd>첫 번째 숫자.</dd>
+ <dt><code>b</code></dt>
+ <dd>두 번째 숫자.</dd>
+</dl>
+
+<h2 id="설명">설명</h2>
+
+<p><code>Math.imul()</code> 를 쓰면 C 언어와 같은 양식의 빠른 32-bit 정수 곱셈이 가능합니다. 이 기능은 <a href="http://en.wikipedia.org/wiki/Emscripten">Emscripten</a> 같은 프로젝트에 유용합니다. <code>imul()</code> 이 <code>Math </code> 객체의 정적 메소드이기 때문에, <code>Math 객체를 직접 만들어서 사용하지 않고 (Math 는 생성자가 아닙니다), Math.imul()</code> 같은 형태로 사용합니다.</p>
+
+<h2 id="예제">예제</h2>
+
+<h3 id="Math.imul()_사용법"><code>Math.imul() 사용법</code></h3>
+
+<pre class="brush: js">Math.imul(2, 4);          // 8
+Math.imul(-1, 8);         // -8
+Math.imul(-2, -2);        // 4
+Math.imul(0xffffffff, 5); // -5
+Math.imul(0xfffffffe, 5); // -10
+</pre>
+
+<h2 id="Polyfill">Polyfill</h2>
+
+<p>다음과 같은 함수로 Math.imul() 을 흉내낼 수 있습니다.</p>
+
+<pre class="brush: js">Math.imul = Math.imul || function(a, b) {
+  var ah = (a &gt;&gt;&gt; 16) &amp; 0xffff;
+  var al = a &amp; 0xffff;
+  var bh = (b &gt;&gt;&gt; 16) &amp; 0xffff;
+  var bl = b &amp; 0xffff;
+  // the shift by 0 fixes the sign on the high part
+  // the final |0 converts the unsigned value into a signed value
+  return ((al * bl) + (((ah * bl + al * bh) &lt;&lt; 16) &gt;&gt;&gt; 0)|0);
+};
+</pre>
+
+<h2 id="스펙">스펙</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">스펙</th>
+   <th scope="col">상태</th>
+   <th scope="col">비고</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-math.imul', 'Math.imul')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>초기 정의.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-math.imul', 'Math.imul')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="브라우저_호환성">브라우저 호환성</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatChrome("28")}}</td>
+   <td>{{CompatGeckoDesktop("20")}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatOpera("16")}}</td>
+   <td>{{CompatSafari("7")}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Chrome for Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatGeckoMobile("20")}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>7</td>
+  </tr>
+ </tbody>
+</table>
+</div>