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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Undefined Behavior sanitizer finding for 1.0f / 0.0f"
href="https://bugs.llvm.org/show_bug.cgi?id=45352">45352</a>
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<th>Summary</th>
<td>Undefined Behavior sanitizer finding for 1.0f / 0.0f
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>8.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Static Analyzer
</td>
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<th>Assignee</th>
<td>dcoughlin@apple.com
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<th>Reporter</th>
<td>noloader@gmail.com
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</tr>
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<th>CC</th>
<td>dcoughlin@apple.com, llvm-bugs@lists.llvm.org
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<p>
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<pre>The following is producing an Undefined Behavior sanitizer finding:
ASSERT(INFINITY == 1.0f / 0.0f);
After a quick read of IEEE 754, it looks like that is conforming behavior for
floats. According the IEEE 754, conforming behavior is infinity if a trap is
not raised.
$ cat test.c
#include <float.h>
#include <math.h>
int main(void)
{
return INFINITY == 1.0f / 0.0f ? 0 : 1;
}
$ clang -fsanitize=undefined test.c -o test.exe
$ ./test.exe
test.c:5:27: runtime error: division by zero
GCC does not produce a finding for floats.</pre>
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