2.3 KiB
2.3 KiB
| Opcode | Instruction | Op/En | 64-Bit Mode | Compat/Leg Mode | Description |
|---|---|---|---|---|---|
| D0 /5 | SHR r/m8,1 | M1 | Valid | Valid | Unsigned divide r/m8 by 2, once. |
| REX + D0 /5 | SHR r/m82, 1 | M1 | Valid | N.E. | Unsigned divide r/m8 by 2, once. |
| D2 /5 | SHR r/m8, CL | MC | Valid | Valid | Unsigned divide r/m8 by 2, CL times. |
| REX + D2 /5 | SHR r/m82, CL | MC | Valid | N.E. | Unsigned divide r/m8 by 2, CL times. |
| C0 /5 ib | SHR r/m8, imm8 | MI | Valid | Valid | Unsigned divide r/m8 by 2, imm8 times. |
| REX + C0 /5 ib | SHR r/m82, imm8 | MI | Valid | N.E. | Unsigned divide r/m8 by 2, imm8 times. |
| D1 /5 | SHR r/m16, 1 | M1 | Valid | Valid | Unsigned divide r/m16 by 2, once. |
| D3 /5 | SHR r/m16, CL | MC | Valid | Valid | Unsigned divide r/m16 by 2, CL times |
| C1 /5 ib | SHR r/m16, imm8 | MI | Valid | Valid | Unsigned divide r/m16 by 2, imm8 times. |
| D1 /5 | SHR r/m32, 1 | M1 | Valid | Valid | Unsigned divide r/m32 by 2, once. |
| REX.W + D1 /5 | SHR r/m64, 1 | M1 | Valid | N.E. | Unsigned divide r/m64 by 2, once. |
| D3 /5 | SHR r/m32, CL | MC | Valid | Valid | Unsigned divide r/m32 by 2, CL times. |
| REX.W + D3 /5 | SHR r/m64, CL | MC | Valid | N.E. | Unsigned divide r/m64 by 2, CL times. |
| C1 /5 ib | SHR r/m32, imm8 | MI | Valid | Valid | Unsigned divide r/m32 by 2, imm8 times. |
| REX.W + C1 /5 ib | SHR r/m64, imm8 | MI | Valid | N.E. | Unsigned divide r/m64 by 2, imm8 times. |
See the IA-32 Architecture Compatibility section below.
In 64-bit mode, r/m8 can not be encoded to access the following byte registers if a REX prefix is used: AH, BH, CH, DH.
Not the same form of division as IDIV; rounding is toward negative infinity.