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<body><span class="vcard"><a class="email" href="mailto:i@maskray.me" title="Fangrui Song <i@maskray.me>"> <span class="fn">Fangrui Song</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - UBSan: Floating point division by zero is not undefined"
href="https://bugs.llvm.org/show_bug.cgi?id=19535">bug 19535</a>
<br>
<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>REOPENED
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
</tr>
<tr>
<td style="text-align:right;">CC</td>
<td>
</td>
<td>i@maskray.me
</td>
</tr></table>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - UBSan: Floating point division by zero is not undefined"
href="https://bugs.llvm.org/show_bug.cgi?id=19535#c13">Comment # 13</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - UBSan: Floating point division by zero is not undefined"
href="https://bugs.llvm.org/show_bug.cgi?id=19535">bug 19535</a>
from <span class="vcard"><a class="email" href="mailto:i@maskray.me" title="Fangrui Song <i@maskray.me>"> <span class="fn">Fangrui Song</span></a>
</span></b>
<pre>float-divide-by-zero was removed from the -fsanitize=undefined by
<a href="https://reviews.llvm.org/D63793">https://reviews.llvm.org/D63793</a>
% cat a.c
int main() { float x = 1.f; float y = x/0.f; y = x/0.f; }
% clang -fsanitize=undefined a.c -o a && ./a
% clang++ -xc++ -fsanitize=undefined a.c -o a && ./a
% gcc -fsanitize=undefined a.c -o a && ./a
% gcc -xc++ -fsanitize=undefined a.c -o a && ./a
# no complaint
The fallout should be fixed by D64317.
% clang -fsanitize=float-divide-by-zero a.c -o a && ./a
a.c:1:40: runtime error: division by zero
a.c:1:51: runtime error: division by zero
% gcc -fsanitize=float-divide-by-zero a.c -o a && ./a
a.c:1:40: runtime error: division by zero
a.c:1:51: runtime error: division by zero
The changes shall be included by clang 9.</pre>
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