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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - The compiler-rt leads to loss of floating precision when GCC use compiler-rt instead of libgcc"
href="https://bugs.llvm.org/show_bug.cgi?id=40453">40453</a>
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<th>Summary</th>
<td>The compiler-rt leads to loss of floating precision when GCC use compiler-rt instead of libgcc
</td>
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<th>Product</th>
<td>compiler-rt
</td>
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<th>Version</th>
<td>7.0
</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>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>compiler-rt
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>messagezsl@outlook.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<div>
<pre>Hi all
Now we are try to use compiler-rt instead of libgcc when we use GCC to
compile program! but we find that comliper-rt will leads to loss of floating
precision, the following is detailed information:
The program:
int main()
{
double one = 1.0;
double tmp = 1.7976931348623157E308;
double ret = one / tmp;
printf(" ret : %E \n", ret);
}
1、GCC compiler program and use libgcc:
result:
ret : 5.562685E-309
2、GCC compiler program and use compiler-rt:
result:
ret : 0.000000E+00
If anyone know the reason why compiler-rt will leads to loss of floating
precision
, Please reply soon when you are convenient! I will appreciate it!</pre>
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