ARMv8 instruction learning (1)

    (1) TBNZ x0, #uimm6, label

             Test and branch Not zero.

             If x0[uimm6] != 0 , then jump to label location and execute.

    (2) TBZ x0, #uimm6, label

            Test and branch Zero.

             If x0[uimm6] == 0 , then jump to label location for execution.

    (3) CBZ x0, label

            Compare and Branch Zero

            If x0 == 0 , then jump to label position and execute

    (4) CBNZ x0, label

           Compare and branch Not zero.

            If x0 != 0 , then jump to label position and execute

2. LDUR / LDURB / LDURSB / LDURH / LDURSH / LDURSW / STUR / STURB / STURH

    They all belong to Load-Store Single Register (unscaled offset)

    unscaled offset: refers to "Base addr + an immediate value"

    (1) ldur x0,[base,#simm9]

           x0 = the content pointed to by [base+simm9]

    (2) ldurb w0,[base,#simm9]

           From the content pointed to by [base+simm9]: take a byte and assign it to w0.

           Other bytes in w0: extended with 0.

    (3) ldursb w0,[base,#simm9]

           From the content pointed to by [base+simm9]: take a byte and assign it to w0.

           Other bytes in w0: extended with the sign bit of this byte.

    (4) ldhur

          Similar to ldurb, but this time takes halfword (2 bytes)

    (5) ldursh

          Similar to ldursb, but this time takes halfword (2 bytes)

    (6) ldursw

          Similar to ldursb, but this time it takes word (4 bytes)

    (7) stubborn x0,[base,#simm9]

         Save x0 to the memory location pointed to by [base+#simm9]

    (8) sturb x0,[base,#simm9]

         Save a byte in x0 to the memory location pointed to by [base+#simm9]

    (9) sturh x0,[base,#simm9]

         Save a half-word (2 bytes) in x0 to the memory location pointed to by [base+#simm9]