<html>
<head>
<base href="http://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - X86 CodeGen: Miscompile vector kernel"
href="http://llvm.org/bugs/show_bug.cgi?id=15467">15467</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>X86 CodeGen: Miscompile vector kernel
</td>
</tr>
<tr>
<th>Product</th>
<td>tools
</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>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>llc
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>aschwaighofer@apple.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=10149" name="attach_10149" title="Failing test">attachment 10149</a> <a href="attachment.cgi?id=10149&action=edit" title="Failing test">[details]</a></span>
Failing test
../Release+Asserts/bin/clang++ -O3 -fvectorize test.cpp -o with;
../Release+Asserts/bin/clang++ -O3 -fno-vectorize test.cpp -o without ; ./with
1 > with.out ; ./without 1 > without.out ; diff with.out without.out
../Release+Asserts/bin/clang++ --version
clang version 3.3 (trunk 176630) (llvm/trunk 176632)
Target: x86_64-apple-darwin13.0.0
Thread model: posix
cat reduced.ll
; ModuleID = 'test.ll'
target datalayout =
"e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.8.0"
@A2 = external global [1024 x i16], align 16
@C2 = external global [1024 x i16], align 16
@D2 = external global [1024 x i16], align 16
define void @_Z7kernel2v() nounwind uwtable noinline ssp {
vector.ph:
br label %vector.body
vector.body: ; preds = %vector.body,
%vector.ph
%index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
%0 = getelementptr inbounds [1024 x i16]* @C2, i64 0, i64 %index
%1 = bitcast i16* %0 to <4 x i16>*
%wide.load = load <4 x i16>* %1, align 8
%2 = zext <4 x i16> %wide.load to <4 x i32>
%3 = getelementptr inbounds [1024 x i16]* @D2, i64 0, i64 %index
%4 = bitcast i16* %3 to <4 x i16>*
%wide.load12 = load <4 x i16>* %4, align 8
%5 = zext <4 x i16> %wide.load12 to <4 x i32>
%6 = shl <4 x i32> %2, %5
%7 = trunc <4 x i32> %6 to <4 x i16>
%8 = getelementptr inbounds [1024 x i16]* @A2, i64 0, i64 %index
%9 = bitcast i16* %8 to <4 x i16>*
store <4 x i16> %7, <4 x i16>* %9, align 8
%index.next = add i64 %index, 4
%10 = icmp eq i64 %index.next, 1024
br i1 %10, label %for.end, label %vector.body
for.end: ; preds = %vector.body
ret void
}
-----
Produces the failing code in kernel2:
../Release+Asserts/bin/llc -mcpu=core2 reduced.ll
It looks like a problem during ISel.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>