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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 - fold away float to double promotion in signbit"
href="https://bugs.llvm.org/show_bug.cgi?id=45305">45305</a>
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<th>Summary</th>
<td>fold away float to double promotion in signbit
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Keywords</th>
<td>code-quality
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: X86
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nok.raven@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
</td>
</tr></table>
<p>
<div>
<pre>#include <cmath>
bool foo(float x) {
return std::signbit(double(x));
}
bool bar(float x) {
return std::signbit(x);
}
define dso_local zeroext i1 @_Z3foof(float %0) local_unnamed_addr #0 {
%2 = fpext float %0 to double
%3 = bitcast double %2 to i64
%4 = icmp slt i64 %3, 0
ret i1 %4
}
define dso_local zeroext i1 @_Z3barf(float %0) local_unnamed_addr #0 {
%2 = bitcast float %0 to i32
%3 = icmp slt i32 %2, 0
ret i1 %3
}
foo(float):
cvtss2sd xmm0, xmm0
movmskpd eax, xmm0
and eax, 1
ret
bar(float):
movmskps eax, xmm0
and eax, 1
ret</pre>
</div>
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