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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Missed optimizations for comparison of doubles in loops"
href="https://bugs.llvm.org/show_bug.cgi?id=37313">37313</a>
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<th>Summary</th>
<td>Missed optimizations for comparison of doubles in loops
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>6.0
</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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Loop Optimizer
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>david.bolvansky@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>Hello,
double test(double *arr, int size) {
double m = INFINITY;
int flag = 1;
int i;
double a;
for (i=0; i<size;++i) {
a = arr[i];
if (a <= m ) {
m = a;
flag = 0;
}
++i;
}
if (flag) {
return 0.0;
}
return m;
}
ASM outputs:
<a href="https://godbolt.org/g/iSjSGW">https://godbolt.org/g/iSjSGW</a>
Seems like Clang generates worse code because LLVM missed same patterns..</pre>
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</p>
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