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List: llvm-bugs
Subject: [llvm-bugs] [Bug 46523] New: rG42f488b63a04 breaks arm64 kernel build with ThinLTO
From: via llvm-bugs <llvm-bugs () lists ! llvm ! org>
Date: 2020-06-30 18:44:34
Message-ID: bug-46523-206 () http ! bugs ! llvm ! org/
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--1593542675.23b8C0f0.7559
Date: Tue, 30 Jun 2020 11:44:35 -0700
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X-Bugzilla-URL: http://bugs.llvm.org/
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https://bugs.llvm.org/show_bug.cgi?id=46523
Bug ID: 46523
Summary: rG42f488b63a04 breaks arm64 kernel build with ThinLTO
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: spatel+llvm@rotateright.com
Reporter: samitolvanen@google.com
CC: llvm-bugs@lists.llvm.org, ndesaulniers@google.com
Created attachment 23658
--> https://bugs.llvm.org/attachment.cgi?id=23658&action=edit
kernel configuration
Commit 42f488b63a04fdaa931315bdadecb6d23e20529a ("[InstCombine] improve
matching for sext-lshr-trunc patterns") breaks the arm64 Linux kernel build
with ThinLTO.
Steps to reproduce:
$ git clone https://github.com/samitolvanen/linux.git
$ cd linux
$ git checkout origin/clang-lto
$ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- LLVM=1 defconfig
$ ./scripts/config -e LTO_CLANG -e NFP -e BPF_SYSCALL
$ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- LLVM=1 olddefconfig
$ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- LLVM=1 -j110
...
LD .tmp_vmlinux.kallsyms1
ld.lld: error: undefined symbol: __compiletime_assert_900
> > > referenced by jit.c:653 (drivers/net/ethernet/netronome/nfp/bpf/jit.c:653)
> > > vmlinux.o:(jeq_imm.llvm.9259135780514890817
make: *** [Makefile:1161: vmlinux] Error 1
This is caused by compiletime_assert in the FIELD_FIT / __BF_FIELD_CHECK macro
in the function ur_load_imm_any, which is called in jeq_imm.
The code compiles fine without ThinLTO, or with the previous revision of LLVM
prior to this commit.
I have attached a .config that reproduces the error.
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--1593542675.23b8C0f0.7559
Date: Tue, 30 Jun 2020 11:44:35 -0700
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Auto-Submitted: auto-generated
<html>
<head>
<base href="https://bugs.llvm.org/">
</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 - rG42f488b63a04 breaks arm64 kernel build with ThinLTO"
href="https://bugs.llvm.org/show_bug.cgi?id=46523">46523</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>rG42f488b63a04 breaks arm64 kernel build with ThinLTO
</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>Linux
</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>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>spatel+llvm@rotateright.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>samitolvanen@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, ndesaulniers@google.com
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=23658" \
name="attach_23658" title="kernel configuration">attachment 23658</a> <a \
href="attachment.cgi?id=23658&action=edit" title="kernel \
configuration">[details]</a></span> kernel configuration
Commit 42f488b63a04fdaa931315bdadecb6d23e20529a ("[InstCombine] improve
matching for sext-lshr-trunc patterns") breaks the arm64 Linux kernel build
with ThinLTO.
Steps to reproduce:
$ git clone <a href="https://github.com/samitolvanen/linux.git">https://github.com/samitolvanen/linux.git</a>
$ cd linux
$ git checkout origin/clang-lto
$ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- LLVM=1 defconfig
$ ./scripts/config -e LTO_CLANG -e NFP -e BPF_SYSCALL
$ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- LLVM=1 olddefconfig
$ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- LLVM=1 -j110
...
LD .tmp_vmlinux.kallsyms1
ld.lld: error: undefined symbol: __compiletime_assert_900
<span class="quote">>>> referenced by jit.c:653 \
(drivers/net/ethernet/netronome/nfp/bpf/jit.c:653) >>> \
vmlinux.o:(jeq_imm.llvm.9259135780514890817</span >
make: *** [Makefile:1161: vmlinux] Error 1
This is caused by compiletime_assert in the FIELD_FIT / __BF_FIELD_CHECK macro
in the function ur_load_imm_any, which is called in jeq_imm.
The code compiles fine without ThinLTO, or with the previous revision of LLVM
prior to this commit.
I have attached a .config that reproduces the error.</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>
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