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<head>
<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - llvm uses GOT to access locally defined variable for PIE"
href="https://llvm.org/bugs/show_bug.cgi?id=24964">24964</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>llvm uses GOT to access locally defined variable for PIE
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>hjl.tools@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, michael.m.kuperstein@intel.com
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>On x86-64, llvm uses GOT to access locally defined variable for PIE.
GOT shouldn't be needed:
[hjl@gnu-32 bin]$ cat x.c
int i;
int
foo (void)
{
return i;
}
[hjl@gnu-32 bin]$ ./clang -S -O2 -fPIE -m64 x.c
[hjl@gnu-32 bin]$ cat x.s
.text
.file "x.c"
.globl foo
.align 16, 0x90
.type foo,@function
foo: # @foo
.cfi_startproc
# BB#0:
movq i@GOTPCREL(%rip), %rax
movl (%rax), %eax
retq
.Lfunc_end0:
.size foo, .Lfunc_end0-foo
.cfi_endproc
.type i,@object # @i
.comm i,4,4
[hjl@gnu-32 bin]$ gcc -S -O2 -fPIE -m64 x.c
[hjl@gnu-32 bin]$ cat x.s
.file "x.c"
.section .text.unlikely,"ax",@progbits
.LCOLDB0:
.text
.LHOTB0:
.p2align 4,,15
.globl foo
.type foo, @function
foo:
.LFB0:
.cfi_startproc
movl i(%rip), %eax
ret
.cfi_endproc
.LFE0:
.size foo, .-foo
.section .text.unlikely
.LCOLDE0:
.text
.LHOTE0:
.comm i,4,4
[hjl@gnu-32 bin]$</pre>
</div>
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