--- tabbed-O3-1.o.objdump 2021-07-05 21:13:23.601297273 +0500 +++ tabbed-O3-2.o.objdump 2021-07-05 21:13:57.461296518 +0500 @@ -2327,10 +2327,10 @@ cmpb $0x2d,(%rbx) jne movzbl 0x1(%rbx),%eax - test %al,%al - je  cmp $0x2d,%al je + test %al,%al + je  mov 0x0(%rip),%r11d # add $0x1,%rbx xor %r9d,%r9d