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<body><span class="vcard"><a class="email" href="mailto:schnetter@gmail.com" title="Erik Schnetter <schnetter@gmail.com>"> <span class="fn">Erik Schnetter</span></a>
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<a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - OpenCL shift counts can overflow"
href="http://llvm.org/bugs/show_bug.cgi?id=11555">bug 11555</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>RESOLVED
</td>
<td>REOPENED
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<td style="text-align:right;">Resolution</td>
<td>INVALID
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<td>---
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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - OpenCL shift counts can overflow"
href="http://llvm.org/bugs/show_bug.cgi?id=11555#c4">Comment # 4</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - OpenCL shift counts can overflow"
href="http://llvm.org/bugs/show_bug.cgi?id=11555">bug 11555</a>
from <span class="vcard"><a class="email" href="mailto:schnetter@gmail.com" title="Erik Schnetter <schnetter@gmail.com>"> <span class="fn">Erik Schnetter</span></a>
</span></b>
<pre>You are correct -- if the arguments are scalars, integer promotion applies.
However, if the left argument of the shift operation is a vector, then integer
promotion does not apply (also OpenCL 6.3.j). This test case demonstrates the
problem:
typedef char char2 __attribute__((__ext_vector_type__(2)));
int main(int argc, char **argv)
{
char2 x = (char2)1 << (char2)9;
printf("[%d,%d]\n", x.s0, x.s1);
return 0;
}
It should output [2,2], but does output [0,0].</pre>
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