[llvm-bugs] [Bug 48572] New: movd mm0, mm1 gets an invalid operand error

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48572

            Bug ID: 48572
           Summary: movd mm0, mm1 gets an invalid operand error
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: chris.sears at gmail.com
                CC: craig.topper at gmail.com, llvm-bugs at lists.llvm.org,
                    llvm-dev at redking.me.uk, pengfei.wang at intel.com,
                    spatel+llvm at rotateright.com

In x86_64, movd mm0, mm1 gets an invalid operand error. gcc and icc both accept
this. The bug happens when there are two mmx register operands for movd. It
doesn't happen for movq or with only a single mmx register operand.

https://godbolt.org/z/7GEdrz

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