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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 --- - illegal results with a vector select case"
href="http://llvm.org/bugs/show_bug.cgi?id=15977">15977</a>
</td>
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<tr>
<th>Summary</th>
<td>illegal results with a vector select case
</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>Linux
</td>
</tr>
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<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>pekka.jaaskelainen@tut.fi
</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=10500" name="attach_10500" title="the kernel LLVM assembly">attachment 10500</a> <a href="attachment.cgi?id=10500&action=edit" title="the kernel LLVM assembly">[details]</a></span>
the kernel LLVM assembly
This is a strange flaky bug that seems like a code gen issue because the .ll
seems fine to me. Also, it passes with LLVM 3.2.
~/local/stow/llvm-3.3/bin/clang main.c -O3 parallel.ll -o foo && ./foo
max(a,b)[0] type=uint2 a=0x15b348c9 b=0xf88e7d07 want=0xf88e7d07 got=15b348c9
min(a,b)[0] type=uint2 a=0x15b348c9 b=0xf88e7d07 want=0x15b348c9 got=f88e7d07
~/local/stow/llvm-3.2/bin/clang main.c -O3 parallel.ll -o foo && ./foo
OK
~/local/stow/llvm-3.3/bin/clang main.c -O0 parallel.ll -o foo && ./foo
max(a,b)[0] type=uint2 a=0x15b348c9 b=0xf88e7d07 want=0xf88e7d07 got=15b348c9
min(a,b)[0] type=uint2 a=0x15b348c9 b=0xf88e7d07 want=0x15b348c9 got=f88e7d07
The code originates from a simple OpenCL C kernel:
kernel
void test_min_max() {
volatile uint2 a = (uint2)(0x15b348c9, 0x15b348c9);
volatile uint2 b = (uint2)(0xf88e7d07, 0xf88e7d07);
uint2 max_ = max(a, b);
uint2 min_ = min(a, b);
printf("max(a,b)[0] type=uint2 a=0x15b348c9 b=0xf88e7d07 want=0xf88e7d07
got=%x\n", max_[0]);
printf("min(a,b)[0] type=uint2 a=0x15b348c9 b=0xf88e7d07 want=0x15b348c9
got=%x\n", min_[0]);
}
I just modified it to remove unneeded args and added a C main to call it. I
also removed the LLVM 3.3's attribute markers to make it compile with LLVM 3.2.
Original pocl bug report:
<a href="https://bugs.launchpad.net/pocl/+bug/1179211">https://bugs.launchpad.net/pocl/+bug/1179211</a></pre>
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