assigned to @ahmedbougacha

repro https://bugs.chromium.org/p/chromium/issues/detail?id=609976 (too big for here)

This should have been fixed in r268787; I'm still working on refining the assertion and writing a small enough testcase.

Looks like one of the bots recovered:
http://lab.llvm.org:8080/green/job/llvm-stage2-cmake-RgLTO_build/7119/

No, this is still broken at r268792

I'll revert for now.

c:\src\llvm-rw>svn commit -m "Revert r268760, it caused #28044 ."
Sending lib\Target\X86\X86FixupBWInsts.cpp
Sending test\CodeGen\X86\2011-06-14-PreschedRegalias.ll
Sending test\CodeGen\X86\anyext.ll
Sending test\CodeGen\X86\avx512-calling-conv.ll
Sending test\CodeGen\X86\avx512-mask-op.ll
Sending test\CodeGen\X86\avx512-select.ll
Sending test\CodeGen\X86\avx512dq-mask-op.ll
Sending test\CodeGen\X86\cmovcmov.ll
Deleting test\CodeGen\X86\fixup-bw-copy.ll
Sending test\CodeGen\X86\float-conv-elim.ll
Sending test\CodeGen\X86\machine-combiner-int.ll
Sending test\CodeGen\X86\opt-ext-uses.ll
Sending test\CodeGen\X86\pr23664.ll
Sending test\CodeGen\X86\vector-bitreverse.ll
Sending test\CodeGen\X86\vector-idiv-sdiv-512.ll
Sending test\CodeGen\X86\vector-idiv-udiv-512.ll
Sending test\CodeGen\X86\xaluo.ll
Transmitting file data ................
Committed revision 268794.

Interesting, thanks! I'll try your testcase.

Bots look green; resolving.