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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] Cannot select v4f64 = vector_shuffle"
href="https://bugs.llvm.org/show_bug.cgi?id=43866">43866</a>
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<th>Summary</th>
<td>[X86] Cannot select v4f64 = vector_shuffle
</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>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Backend: X86
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>Wolfgang_Pieb@playstation.sony.com
</td>
</tr>
<tr>
<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
</td>
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<pre>The attached IR causes an ICE when compiled with the latest llc for an X86
target:
$ llc test.ll
LLVM ERROR: Cannot select: t53: v4f64 = vector_shuffle<0,1,0,1> t51,
undef:v4f64
t51: v4f64 = bitcast t72
t72: v8i32 = BUILD_VECTOR undef:i32, Constant:i32<-1>, undef:i32,
undef:i32, undef:i32, undef:i32, undef:i32, undef:i32
t9: i32 = undef
t5: i32 = Constant<-1>
t9: i32 = undef
t9: i32 = undef
t9: i32 = undef
t9: i32 = undef
t9: i32 = undef
t9: i32 = undef
t52: v4f64 = undef
In function: test
It seems it's caused by
==============================================
commit 30837abd9623bf2c8582627d2179828ecf361965
Author: Craig Topper <<a href="mailto:craig.topper@intel.com">craig.topper@intel.com</a>>
Date: Sun Sep 8 19:24:29 2019 +0000
[X86] Teach materializeVectorConstant to not call
getZeroVector/getOnesVector on the types we already have isel patterns for.
llvm-svn: 371343
==============================================
The .ll file was generated (and then hand-reduced) with
clang version 10.0.0 (<a href="mailto:git@github.com">git@github.com</a>:llvm/llvm-project.git 30837abd9623b...)
from the following C source:
typedef unsigned __attribute__((ext_vector_type(2))) uint2;
typedef unsigned __attribute__((ext_vector_type(8))) uint8;
uint2 v2_0;
void test()
{
uint2 v2_1 = {1, 1};
uint2 v2_2 = (uint2)(v2_0 || v2_1);
volatile uint8 v8_0 = __builtin_shufflevector(v2_0, v2_2, 1, 3, 0, 0, 3,
3, 2, 2);
}</pre>
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