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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 --- - opt -O1 creates a file which output differs when run with lli -force-interpreter."
href="http://llvm.org/bugs/show_bug.cgi?id=21170">21170</a>
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<th>Summary</th>
<td>opt -O1 creates a file which output differs when run with lli -force-interpreter.
</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>
</tr>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>karl.tarbe@cyber.ee
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=13147" name="attach_13147" title="Original program, that prints out some data.">attachment 13147</a> <a href="attachment.cgi?id=13147&action=edit" title="Original program, that prints out some data.">[details]</a></span>
Original program, that prints out some data.
I have a simple program in llvm IR, that prints out data in hex 24 values on a
row.
When I run it with
strace lli -force-interpreter=true print.ll > /tmp/file
The last lines of strace are:
lseek(1, 0, SEEK_CUR) = 0
fstat(1, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
write(1, "fa ff ff 7f bf fe ff ff 4f 00 00"..., 606) = 606
close(1) = 0
brk(0x1def000) = 0x1def000
exit_group(0) = ?
+++ exited with 0 +++
Now if I do: opt -O1 print.ll -o print.bc
and run that
strace lli -force-interpreter=true print.bc > /tmp/file
The last lines of strace are:
lseek(1, 0, SEEK_CUR) = 0
fstat(1, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
fstat(1, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7feb8e3e5000
write(1, "fa ff ff 7f bf fe ff ff 4f 00 00"..., 597) = 597
close(1) = 0
brk(0x221b000) = 0x221b000
write(1, "\n\n\n\n\n\n\n\n\n", 9) = -1 EBADF (Bad file descriptor)
exit_group(0) = ?
+++ exited with 0 +++
print.ll produces a correct file.
print.bc (*optimized variant) produces an incorrect file (no newline
characters).
And the problem does not appear when not forcing to use interpreter, or when
not redirecting the output to a file.</pre>
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