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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [AVX512] LLVM ERROR: Cannot select: t54: v8f64 = vselect t46, undef:v8f64, t17"
href="https://bugs.llvm.org/show_bug.cgi?id=34139">34139</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[AVX512] LLVM ERROR: Cannot select: t54: v8f64 = vselect t46, undef:v8f64, t17
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</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: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>babokin@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>clang version 6.0.0 (trunk 310421)
<span class="quote">> cat bugpoint-reduced-simplified.ll</span >
; ModuleID = 'bugpoint-reduced-simplified.bc'
source_filename = "bugpoint-output-19a0c4b.bc"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; Function Attrs: nounwind
define void @f_f() #0 {
allocas:
store <16 x i8> <i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8
-1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1>, <16 x i8>* undef
%load_mask8.i.i.i = load <16 x i8>, <16 x i8>* undef
%v.i.i.i.i = load <16 x double>, <16 x double>* undef
%mask_vec_i1.i.i.i51.i.i = icmp ne <16 x i8> %load_mask8.i.i.i,
zeroinitializer
%v1.i.i.i.i = select <16 x i1> %mask_vec_i1.i.i.i51.i.i, <16 x double> undef,
<16 x double> %v.i.i.i.i
store <16 x double> %v1.i.i.i.i, <16 x double>* undef
unreachable
}
attributes #0 = { nounwind }
!llvm.module.flags = !{!0}
!0 = !{i32 1, !"wchar_size", i32 4}
<span class="quote">> llc -O2 -mcpu=knl bugpoint-reduced-simplified.bc</span >
LLVM ERROR: Cannot select: t54: v8f64 = vselect t46, undef:v8f64, t17
t46: v8i64 = bitcast t45
t45: v16i32 = BUILD_VECTOR Constant:i32<-1>, Constant:i32<-1>,
Constant:i32<-1>, Constant:i32<-1>, Constant:i32<-1>, Constant:i32<-1>,
Constant:i32<-1>, Constant:i32<-1>, Constant:i32<-1>, Constant:i32<-1>,
Constant:i32<-1>, Constant:i32<-1>, Constant:i32<-1>, Constant:i32<-1>,
Constant:i32<-1>, Constant:i32<-1>
t44: i32 = Constant<-1>
t44: i32 = Constant<-1>
t44: i32 = Constant<-1>
t44: i32 = Constant<-1>
t44: i32 = Constant<-1>
t44: i32 = Constant<-1>
t44: i32 = Constant<-1>
t44: i32 = Constant<-1>
t44: i32 = Constant<-1>
t44: i32 = Constant<-1>
t44: i32 = Constant<-1>
t44: i32 = Constant<-1>
t44: i32 = Constant<-1>
t44: i32 = Constant<-1>
t44: i32 = Constant<-1>
t44: i32 = Constant<-1>
t16: v8f64 = undef
t17: v8f64,ch = load<LD64[undef(align=128)+64](align=64)> t49, undef:i64,
undef:i64
t3: i64 = undef
t3: i64 = undef
In function: f_f</pre>
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