$rax $r0
$rbx $r1
$rcx $r2
$rdx $r3
$rsi $r4
$rdi $r5

$ax0 $r6
$ax1 $r7
$ax2 $r8
$ax3 $r9
$ax4 $r10
$ax5 $r11

$nx0 $r12
$nx1 $r13
$nx2 $r14
$nx3 $r15
$nx4 $r16
$nx5 $r17
$nx6 $r18
$nx7 $r19
$nx8 $r20

$grp $r21
$trp $r22
$srp $r23

$tmp $r24
$rad $r25

$cr0 $r26
$cr1 $r27

$rip $r28
$rbp $r29
$rsp $r30

$zero $r31