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<base href="https://bugs.webkit.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Math.min changes behavior with negative zero when tiering up"
href="https://bugs.webkit.org/show_bug.cgi?id=166413">166413</a>
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<th>Summary</th>
<td>Math.min changes behavior with negative zero when tiering up
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>Product</th>
<td>WebKit
</td>
</tr>
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<th>Version</th>
<td>WebKit Nightly Build
</td>
</tr>
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<th>Hardware</th>
<td>Unspecified
</td>
</tr>
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<th>OS</th>
<td>Unspecified
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>Normal
</td>
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<th>Priority</th>
<td>P2
</td>
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<th>Component</th>
<td>JavaScriptCore
</td>
</tr>
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
</td>
</tr>
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<th>Reporter</th>
<td>keith_miller@apple.com
</td>
</tr></table>
<p>
<div>
<pre>It looks like the code converts the min(a, b) into a < b ? a : b. This does not work for -0.0 and 0.0:
Test case:
function test(value, iter) {
if (Infinity/value !== -Infinity)
throw new Error(iter);
}
noInline(test);
function foo(a, b, iter) {
test(Math.min(a, b), iter);
}
noInline(foo);
for (let i = 0; i < 10000; i++) {
foo(-0.0, 0.0, i);
}</pre>
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