On 07/01/2010 05:04 AM, Vic3Dexe wrote: > Public bug reported: > > xchg r8,rax (49h 90h) executed as nop (90h) in long mode, in other words > REX not used. > > qemu 0.12.4, host Win 7 x64, running qemu-system-x86_64.exe. > > ** Affects: qemu > Importance: Undecided > Status: New >
Verified. Test case for x86_64-linux-user:
.globl main
.type main, @function
main:
movl $0, %r8d
movl $1, %eax
xchgq %r8, %rax
ret
Expected result is exit status 0.
r~
