[llvm-bugs] [Bug 33978] New: "Flags mismatch!" assertion on LLVM 5.0 with MIPS

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33978

            Bug ID: 33978
           Summary: "Flags mismatch!" assertion on LLVM 5.0 with MIPS
           Product: libraries
           Version: 5.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: MIPS
          Assignee: unassignedbugs at nondot.org
          Reporter: alex at crichton.co
                CC: llvm-bugs at lists.llvm.org

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'

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