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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Compile-time regression after r368307"
href="https://bugs.llvm.org/show_bug.cgi?id=43024">43024</a>
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<th>Summary</th>
<td>Compile-time regression after r368307
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>rupprecht@google.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
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<div>
<pre>The following ll file takes ~0.1 seconds before r368307, and >60s after it.
(It's distilled from a C++ file that used to take 5-10 seconds, and now times
out after at least 3 hours).
Repro is just:
$ llc repro.ll
$ cat repro.ll
source_filename = "repro.cc"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-grtev4-linux-gnu"
define dso_local void @foo() unnamed_addr #0 align 32 {
store <4 x float> <float 0x7FF8000000000000, float 0x7FF8000000000000, float
0x0, float 0x0>, <4 x float>* undef, align 16
%1 = load <4 x float>, <4 x float>* undef, align 16
%2 = fmul <4 x float> %1, <float 0x0, float 0x0, float 0x0, float 0x0>
%3 = shufflevector <4 x float> %2, <4 x float> undef, <4 x i32> <i32 1, i32
undef, i32 undef, i32 undef>
%4 = fadd <4 x float> %2, %3
%5 = fadd <4 x float> zeroinitializer, %4
%6 = shufflevector <4 x float> %2, <4 x float> undef, <4 x i32> <i32 3, i32
undef, i32 undef, i32 undef>
%7 = fadd <4 x float> %6, %5
%8 = extractelement <4 x float> %7, i32 0
store float %8, float* undef, align 8
br label %10
9: ; preds = %10
ret void
10: ; preds = %10, %0
br i1 undef, label %9, label %10
}
attributes #0 = {
"target-features"="+aes,+cx8,+fxsr,+mmx,+pclmul,+popcnt,+sse,+sse2,+sse3,+sse4.1,+sse4.2,+ssse3,+x87"
}</pre>
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