[Issue 12878] New: inline asm memory operand always uses 64-bit addressing

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12878

          Issue ID: 12878
           Summary: inline asm memory operand always uses 64-bit
                    addressing
           Product: D
           Version: unspecified
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: DMD
          Assignee: nobody at puremagic.com
          Reporter: code at dawg.eu

cat > bug.d << CODE
void main()
{
    asm
    {
        mov EAX, [ESI];
        movdqu XMM0, [ESI];
    }
}
CODE

dmd -c bug.d
objdump -d bug.o
----
   4:    8b 06                    mov    (%rsi),%eax
   6:    f3 0f 6f 06              movdqu (%rsi),%xmm0
----
The compiler should emit an address size prefix (67H) like so.
----
  15:    67 8b 06                 mov    (%esi),%eax
  18:    67 f3 0f 6f 06           movdqu (%esi),%xmm0
----

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