<html>
<head>
<base href="http://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - misaligned callee save of xmm registers on windows when avx enabled"
href="http://llvm.org/bugs/show_bug.cgi?id=22572">22572</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>misaligned callee save of xmm registers on windows when avx enabled
</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>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>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>andrew.b.adams@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=13858" name="attach_13858" title="Broken ll">attachment 13858</a> <a href="attachment.cgi?id=13858&action=edit" title="Broken ll">[details]</a></span>
Broken ll
Compiling the attached ll like so:
llc mandelbrot.ll -filetype=asm -o -
I get the following prologue for the function "par for mandelbrot_f0.s0.y.yo".
It's correct.
pushq %rbp
pushq %r15
pushq %r14
pushq %r13
pushq %r12
pushq %rsi
pushq %rdi
pushq %rbx
subq $408, %rsp # imm = 0x198
leaq 128(%rsp), %rbp
movaps %xmm15, 256(%rbp) # 16-byte Spill
movdqa %xmm14, 240(%rbp) # 16-byte Spill
movaps %xmm13, 224(%rbp) # 16-byte Spill
movaps %xmm12, 208(%rbp) # 16-byte Spill
movdqa %xmm11, 192(%rbp) # 16-byte Spill
movaps %xmm10, 176(%rbp) # 16-byte Spill
movaps %xmm9, 160(%rbp) # 16-byte Spill
movaps %xmm8, 144(%rbp) # 16-byte Spill
movaps %xmm7, 128(%rbp) # 16-byte Spill
movaps %xmm6, 112(%rbp) # 16-byte Spill
If I add the flag -mattr=+avx, I get this instead:
pushq %rbp
pushq %r15
pushq %r14
pushq %r13
pushq %r12
pushq %rsi
pushq %rdi
pushq %rbx
subq $480, %rsp # imm = 0x1E0
leaq 128(%rsp), %rbp
vmovaps %xmm15, 336(%rbp) # 16-byte Spill
vmovaps %xmm14, 320(%rbp) # 16-byte Spill
vmovaps %xmm13, 304(%rbp) # 16-byte Spill
vmovaps %xmm12, 288(%rbp) # 16-byte Spill
vmovdqa %xmm11, 272(%rbp) # 16-byte Spill
vmovaps %xmm10, 256(%rbp) # 16-byte Spill
vmovaps %xmm9, 240(%rbp) # 16-byte Spill
vmovaps %xmm8, 224(%rbp) # 16-byte Spill
vmovdqa %xmm7, 208(%rbp) # 16-byte Spill
vmovaps %xmm6, 192(%rbp) # 16-byte Spill
Those movaps instructions are all misaligned by 8 bytes (and indeed it
crashes).</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>