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<body><span class="vcard"><a class="email" href="mailto:llvm-dev@redking.me.uk" title="Simon Pilgrim <llvm-dev@redking.me.uk>"> <span class="fn">Simon Pilgrim</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Failure to avoid emitting a useless instruction when doing combined shits and rotates with a smaller result"
href="https://bugs.llvm.org/show_bug.cgi?id=46138">bug 46138</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
</tr>
<tr>
<td style="text-align:right;">Fixed By Commit(s)</td>
<td>
</td>
<td>e1d4ca00094a4267b6fd70f613f2e0390b2a8cbf
</td>
</tr></table>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Failure to avoid emitting a useless instruction when doing combined shits and rotates with a smaller result"
href="https://bugs.llvm.org/show_bug.cgi?id=46138#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Failure to avoid emitting a useless instruction when doing combined shits and rotates with a smaller result"
href="https://bugs.llvm.org/show_bug.cgi?id=46138">bug 46138</a>
from <span class="vcard"><a class="email" href="mailto:llvm-dev@redking.me.uk" title="Simon Pilgrim <llvm-dev@redking.me.uk>"> <span class="fn">Simon Pilgrim</span></a>
</span></b>
<pre>Constant rotations are now folded to llvm.fshl in InstCombine:
define i32 @fi32 %0) {
%2 = load i64, i64* @_ZZ1fjE1x, align 8
%3 = add i64 %2, 1
%4 = tail call i64 @llvm.fshl.i64(i64 %3, i64 %3, i64 32)
store i64 %4, i64* @_ZZ1fjE1x, align 8
%5 = trunc i64 %4 to i32
ret i32 %5
}
declare i64 @llvm.fshl.i64(i64, i64, i64)
f:
movq _ZZ1fjE1x(%rip), %rax
incq %rax
rorxq $32, %rax, %rax
movq %rax, _ZZ1fjE1x(%rip)
retq</pre>
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