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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 - [x86-64] Suboptimal codegen on uint128 negation"
href="https://bugs.llvm.org/show_bug.cgi?id=40825">bug 40825</a>
<br>
<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">See Also</td>
<td>
</td>
<td>https://bugs.llvm.org/show_bug.cgi?id=40483
</td>
</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></table>
<p>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [x86-64] Suboptimal codegen on uint128 negation"
href="https://bugs.llvm.org/show_bug.cgi?id=40825#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [x86-64] Suboptimal codegen on uint128 negation"
href="https://bugs.llvm.org/show_bug.cgi?id=40825">bug 40825</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>This is fixed in trunk, I think from the work on [<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [X86] Failure to merge ISD::SUB(x,y) and X86ISD::SUB(x,y)"
href="show_bug.cgi?id=40483">Bug #40483</a>]
trunk / 9.0:
wider_tests::Tests<unsigned __int128>::neg(unsigned __int128*):
xorl %eax, %eax
negq (%rdi)
sbbq 8(%rdi), %rax
movq %rax, 8(%rdi)
retq
wider_tests::Tests<Wider<unsigned long> >::neg(Wider<unsigned long>*):
xorl %eax, %eax
negq (%rdi)
sbbq 8(%rdi), %rax
movq %rax, 8(%rdi)
retq
vs 8.0:
wider_tests::Tests<unsigned __int128>::neg(unsigned __int128*):
xorl %eax, %eax
xorl %ecx, %ecx
subq (%rdi), %rcx
sbbq 8(%rdi), %rax
movq %rcx, (%rdi)
movq %rax, 8(%rdi)
retq
wider_tests::Tests<Wider<unsigned long> >::neg(Wider<unsigned long>*):
movq (%rdi), %rax
testq %rax, %rax
setne %cl
negq %rax
xorl %edx, %edx
addb $-1, %cl
sbbq 8(%rdi), %rdx
movq %rax, (%rdi)
movq %rdx, 8(%rdi)
retq</pre>
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