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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 --- - invalid vectorization of fcmp oge and friends"
href="http://llvm.org/bugs/show_bug.cgi?id=22371">22371</a>
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<th>Summary</th>
<td>invalid vectorization of fcmp oge and friends
</td>
</tr>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<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>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>pitrou@free.fr
</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>Trying llvm3.6rc1 with Numba, I get crashes on some vectorized code for ordered
comparisons.
For a loop running "fcmp oge" over an array of doubles, generated assembly
looks like this (x86-64):
.align 8
.LCPI0_0:
.quad 4607182418800017408
.text
.globl "__main__.fn.float64.float64.array(float64,_1d,_C,_nonconst)"
.align 16, 0x90
.type
"__main__.fn.float64.float64.array(float64,_1d,_C,_nonconst)",@function
"__main__.fn.float64.float64.array(float64,_1d,_C,_nonconst)":
movq 32(%rdx), %r8
testq %r8, %r8
jle .LBB0_19
movq 24(%rdx), %rcx
cmplesd %xmm0, %xmm1
movabsq $.LCPI0_0, %rax
andpd (%rax), %xmm1
[snip]
The "andpd (%rax), %xmm1" crashes. AFAIU, that's because $.LCPI0_0 is not
16-byte aligned.
A quick look with gdb seems to confirm that hypothesis:
(gdb) info registers rax
rax 0x7ffff7fea058 140737354047576
(gdb) x/2 0x7ffff7fea058
0x7ffff7fea058: 0x00000000 0x3ff00000</pre>
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