[llvm-bugs] [Bug 48572] movd %r8, %mm7 should be illegal

[via llvm-bugs]

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

chris.sears at gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|INVALID                     |---
            Summary|movd mm0, mm1 gets an       |movd %r8, %mm7 should be
                   |invalid operand error       |illegal
             Status|RESOLVED                    |REOPENED

--- Comment #4 from chris.sears at gmail.com ---
I'm reopening this and changing the name summary slightly. I don't know if that
is correct or if I should just open another bug.

movd %r8, %mm7 should be illegal. (Correct code would use r8d.) However,
instead of syntax erroring, movd is instead silently converted to movq %r8,
%mm7

BAD:
        echo "movd %r8, %mm7" | llvm-mc -show-encoding -assemble -triple
x86_64-unknown-unknown

        .text
        movq    %r8, %mm7                       # encoding:
[0x49,0x0f,0x6e,0xf8]

GOOD:
        echo "movd %r8d, %mm7" | llvm-mc -show-encoding -assemble -triple
x86_64-unknown-unknown

        .text
        movd    %r8d, %mm7                      # encoding:
[0x41,0x0f,0x6e,0xf8]

GOOD:
        echo "movq %r8, %mm7" | llvm-mc -show-encoding -assemble -triple
x86_64-unknown-unknown

        .text
        movq    %r8, %mm7                       # encoding:
[0x49,0x0f,0x6e,0xf8]

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