- lea 2($num),%r11
- neg %r11
- lea -264(%rsp,%r11,8),%rsp # tp=alloca(8*(num+2)+256+8)
- and \$-1024,%rsp # minimize TLB usage
+ neg $num
+ mov %rsp,%r11
+ lea -280(%rsp,$num,8),%r10 # future alloca(8*(num+2)+256+8)
+ neg $num # restore $num
+ and \$-1024,%r10 # minimize TLB usage