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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 - Unnecessary branch with -fstrict-enums"
href="https://bugs.llvm.org/show_bug.cgi?id=46279">46279</a>
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</tr>
<tr>
<th>Summary</th>
<td>Unnecessary branch with -fstrict-enums
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</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>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jmuizelaar@mozilla.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>This code:
#include <stdlib.h>
enum Foo {
A,
B,
C,
};
Foo foo(Foo* data) {
Foo k = data[1];
if (k > Foo::C) {
exit(3);
}
return k;
}
compiles with -fstrict-enums to:
foo(Foo*): # @foo(Foo*)
pushq %rax
movl 4(%rdi), %eax
cmpl $3, %eax
je .LBB0_2
popq %rcx
retq
.LBB0_2:
movl $3, %edi
callq exit
It should be possible to elide the call to exit()
Interestingly enough, without -fstrict-enums the je becomes jge so LLVM has
some idea about what's going on.</pre>
</div>
</p>
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