[llvm-bugs] [Bug 31955] New: LLVM Fails to disassemble embedded rounding control

[via llvm-bugs]

http://bugs.llvm.org/show_bug.cgi?id=31955

            Bug ID: 31955
           Summary: LLVM Fails to disassemble embedded rounding control
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: keno at alumni.harvard.edu
                CC: llvm-bugs at lists.llvm.org

The assembler seems fine, but the disassembler has trouble recognizing the
instruction:

```
./bin/llvm-mc -mattr=+avx512f -filetype=obj -o - - | ./bin/llvm-objdump -d -
vaddss {rd-sae}, %xmm28, %xmm21, %xmm31

<stdin>:        file format ELF64-x86-64

Disassembly of section .text:
.text:
       0:       62 01 56 30 58  <unknown>
       5:       fc      cld
```

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