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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SystemZ] Cannot select SystemZISD::GET_CCMASK with usubo"
href="https://bugs.llvm.org/show_bug.cgi?id=42512">42512</a>
</td>
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<tr>
<th>Summary</th>
<td>[SystemZ] Cannot select SystemZISD::GET_CCMASK with usubo
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: SystemZ
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nikita.ppv@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>target datalayout = "E-m:e-i1:8:16-i8:8:16-i64:64-f128:64-a:8:16-n32:64"
target triple = "s390x-unknown-linux-gnu"
define i8 @test(i8 %x) {
%usubo = tail call { i64, i1 } @llvm.usub.with.overflow.i64(i64 undef, i64 1)
%ov = extractvalue { i64, i1 } %usubo, 1
%ovext = zext i1 %ov to i8
%ret = add i8 %x, %ovext
ret i8 %ret
}
; Function Attrs: nounwind readnone speculatable
declare { i64, i1 } @llvm.usub.with.overflow.i64(i64, i64) #0
attributes #0 = { nounwind readnone speculatable }
Produces:
LLVM ERROR: Cannot select: t21: i32 = SystemZISD::GET_CCMASK t34,
Constant:i32<15>, Constant:i32<3>
t34: i32 = srl t32, Constant:i32<31>
t32: i32 = add t30, Constant:i32<-536870912>
t30: i32 = SystemZISD::IPM t26:1
t26: i64,i32 = SystemZISD::USUBO undef:i64, Constant:i64<1>
t4: i64 = undef
t5: i64 = Constant<1>
t31: i32 = Constant<-536870912>
t33: i32 = Constant<31>
t20: i32 = Constant<15>
t19: i32 = Constant<3>
In function: test</pre>
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