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<body><span class="vcard"><a class="email" href="mailto:paulsson@linux.vnet.ibm.com" title="Jonas Paulsson <paulsson@linux.vnet.ibm.com>"> <span class="fn">Jonas Paulsson</span></a>
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<a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [SystemZ] Backend emits an STRL to an unaligned address"
href="https://bugs.llvm.org/show_bug.cgi?id=44405">bug 44405</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
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<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 - [SystemZ] Backend emits an STRL to an unaligned address"
href="https://bugs.llvm.org/show_bug.cgi?id=44405#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [SystemZ] Backend emits an STRL to an unaligned address"
href="https://bugs.llvm.org/show_bug.cgi?id=44405">bug 44405</a>
from <span class="vcard"><a class="email" href="mailto:paulsson@linux.vnet.ibm.com" title="Jonas Paulsson <paulsson@linux.vnet.ibm.com>"> <span class="fn">Jonas Paulsson</span></a>
</span></b>
<pre>(In reply to Eli Friedman from <a href="show_bug.cgi?id=44405#c1">comment #1</a>)
<span class="quote">> You're performing a store with align 4 to an unaligned variable.
>
> (Implicit alignment in IR is confusing, useless historical artifact; we
> should get rid of it, but I haven't had time.)</span >
I am not sure I follow your reasoning:
- This is not affected by adding explicit alignments on the variable and the
store.
- Since this is the second element of the struct, lying after an i16, it will
never be guaranteed to be aligned at 4 bytes.
- The STRL instruction demands a 4 byte alignment. Therefore, I think the
backend should emit an MVHI instead, which does not have this requirement (if
the first element is changed to be an i8, the MVHI is produced).</pre>
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