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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - x86_64: Result code use stack before %rsp (out of stack frame)"
href="http://llvm.org/bugs/show_bug.cgi?id=15573">15573</a>
</td>
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<tr>
<th>Summary</th>
<td>x86_64: Result code use stack before %rsp (out of stack frame)
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>MacOS X
</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>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>leo@sai.msu.ru
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=10229" name="attach_10229" title="Compile: `clang++ -O3 -m64 -S LayoutGost.cpp'">attachment 10229</a> <a href="attachment.cgi?id=10229&action=edit" title="Compile: `clang++ -O3 -m64 -S LayoutGost.cpp'">[details]</a></span>
Compile: `clang++ -O3 -m64 -S LayoutGost.cpp'
For function with complex vector operation, when need Spill/Reload registers.
Result x86_64 code (Spill/Reload out of frame):
...
movq %rsp, %rbp
Ltmp5:
.cfi_def_cfa_register %rbp
pushq %r15
pushq %r14
pushq %r13
pushq %r12
pushq %rbx
subq $696, %rsp
...
movq %rdx, -856(%rbp)
...
movdqa %xmm4, -752(%rbp)
...
movq -856(%rbp), %rax
...
movdqa -752(%rbp), %xmm3
As result for programs with signals or interrupts, signal/interrupt handler
rewrite stack below %rsp.
Sorry, I can't reduce code. Compile: `clang++ -O3 -m64 -S LayoutGost.cpp'
Affect clang x86_64: 3.0, 3.1, 3.2, 3.3 (trunk 173279) and Xcode 4.6.1 Apple
LLVM version 4.2 (clang-425.0.27) (based on LLVM 3.2svn)
$ uname -a
Darwin leom-3.local 12.3.0 Darwin Kernel Version 12.3.0: Sun Jan 6 22:37:10
PST 2013; root:xnu-2050.22.13~1/RELEASE_X86_64 x86_64</pre>
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