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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 - Wrong results from floor() on arm"
href="https://bugs.llvm.org/show_bug.cgi?id=34530">34530</a>
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<th>Summary</th>
<td>Wrong results from floor() on arm
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>5.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>raj.khem@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>This testcase
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
int main(void)
{
double test = 526457263.914274;
double test2 = 526457263.000000;
printf("orig=%f floor=%f\n", test, floor(test));
printf("orig=%f floor=%f\n", test2, floor(test2));
return 0;
}
runtime results on arm are wrong when -On option is not used.
root@raspberrypi3:~# ./a.out
orig=526457263.914274 floor=526457088.000052
orig=526457263.000000 floor=0.000000
if I compile it with -Os or -O2 then results are correct
root@raspberrypi3:~# ./a.out
orig=526457263.914274 floor=526457263.000000
orig=526457263.000000 floor=526457263.000000
This is a regression starting 4.0, it works fine with 3.7</pre>
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