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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - "Flags mismatch!" assertion on LLVM 5.0 with MIPS"
href="https://bugs.llvm.org/show_bug.cgi?id=33978">33978</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>"Flags mismatch!" assertion on LLVM 5.0 with MIPS
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>5.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</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: MIPS
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>alex@crichton.co
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>In updating rust-lang/rust to LLVM 5.0 we've discovered what appears to be a
code generator assertion on MIPS targets. We've used `bugpoint` to minimize the
failing test case to:
target triple = "mips-unknown-linux-gnu"
define void @foo() {
start:
%a = alloca i32
%b = alloca [22 x i8], align 2
%c = bitcast i32* %a to i8*
%d = getelementptr inbounds [22 x i8], [22 x i8]* %b, i32 0, i32 2
call void @llvm.memcpy.p0i8.p0i8.i32(i8* nonnull %c, i8* %d, i32 20, i32 2,
i1 false)
%e = getelementptr inbounds [22 x i8], [22 x i8]* %b, i32 0, i32 6
call void @llvm.memcpy.p0i8.p0i8.i32(i8* undef, i8* %e, i32 12, i32 2, i1
false)
ret void
}
declare void @llvm.memcpy.p0i8.p0i8.i32(i8*, i8*, i32, i32, i1)
If this is exected with `llc foo.ll -filetype=obj -o foo.o` then it'll crash
with:
llc: /checkout/src/llvm/lib/CodeGen/MachineInstr.cpp:649: void
llvm::MachineMemOperand::refineAlignment(const llvm::MachineMemOperand*):
Assertion `MMO->getFlags() == getFlags() && "Flags mismatch!"' failed.
#0 0x0000000001bbfb8a (llc+0x1bbfb8a)
#1 0x0000000001bbd8fe (llc+0x1bbd8fe)
#2 0x0000000001bbda72 (llc+0x1bbda72)
#3 0x00007f1262aed390 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x11390)
#4 0x00007f1261ca2428 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x35428)
#5 0x00007f1261ca402a abort (/lib/x86_64-linux-gnu/libc.so.6+0x3702a)
#6 0x00007f1261c9abd7 (/lib/x86_64-linux-gnu/libc.so.6+0x2dbd7)
#7 0x00007f1261c9ac82 (/lib/x86_64-linux-gnu/libc.so.6+0x2dc82)
#8 0x0000000001394e90 (llc+0x1394e90)
#9 0x0000000001a58be7 (llc+0x1a58be7)
#10 0x0000000000c7bace (llc+0xc7bace)
#11 0x0000000000c816d7 (llc+0xc816d7)
#12 0x0000000000cb8175 (llc+0xcb8175)
#13 0x0000000000cc7875 (llc+0xcc7875)
#14 0x00000000019c9f38 (llc+0x19c9f38)
#15 0x00000000019d014e (llc+0x19d014e)
#16 0x00000000019d472c (llc+0x19d472c)
#17 0x0000000001a8659a (llc+0x1a8659a)
#18 0x0000000001a8c8b9 (llc+0x1a8c8b9)
#19 0x0000000001a8e869 (llc+0x1a8e869)
#20 0x0000000000c7a44a (llc+0xc7a44a)
#21 0x000000000138ee85 (llc+0x138ee85)
#22 0x00000000016966c3 (llc+0x16966c3)
#23 0x000000000169678c (llc+0x169678c)
#24 0x000000000169622d (llc+0x169622d)
#25 0x00000000006eed03 (llc+0x6eed03)
#26 0x0000000000681e1c (llc+0x681e1c)
#27 0x00007f1261c8d830 __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x20830)
#28 0x00000000006e1b09 (llc+0x6e1b09)
Stack dump:
0. Program arguments: llc bugpoint-reduced-simplified.ll -filetype=obj -o
foo.o
1. Running pass 'Function Pass Manager' on module
'bugpoint-reduced-simplified.ll'.
2. Running pass 'MIPS DAG->DAG Pattern Instruction Selection' on function
'@foo'</pre>
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