{\hfill% \fcolorbox{black}{white}{% \begin{tabular}{ll} A0 & rcx \\ A1 & rdx \\ A2 & r8 \\ \hline B0 & rax \\ B1 & rbx \\ B2 & r10 \\ B3 & r11 \\ B4 & r12 \\ B5 & r13 \\ B6 & r14 \\ \hline asp & rsi \\ bsp & rsp \\ hp & rdi \\ free & r15 \\ \hline scratch & rbp \\ scratch & r9 \\ \end{tabular}% }% \hfill% \fcolorbox{black}{white}{% \begin{tabular}{ll} rax & B0 \\ rbx & B1 \\ rcx & A0 \\ rdx & A1 \\ \hline rbp & scratch \\ rdi & hp \\ rsi & asp \\ rsp & bsp \\ \hline r8 & A2 \\ r9 & scratch \\ r10 & B2 \\ r11 & B3 \\ r12 & B4 \\ r13 & B5 \\ r14 & B6 \\ r15 & free \\ \end{tabular}% }% \hfill}%