Instruction Set
4-224
SHL*
Shift Left
SHL
What It Does
SAL and SHL shift the bits of a component to the left, filling vacant bits with 0s.
See SAL on page 4-211 for a complete description.
* – Shift immediates were not available on the original 8086/8088 systems.
Form
Opcode
Description
Clocks
Am186 Am188
SHL
r/m8,1
D0
/4
Multiply r/m byte by 2, once
2/15
2/15
SHL
r/m8,CL
D2
/4
Multiply r/m byte by 2, CL times
5+
n/17+n
5+
n/17+n
SHL
r/m8,imm8
C0
/4 ib
Multiply r/m byte by 2, imm8 times
5+
n/17+n
5+
n/17+n
SHL
r/m16,1
D1
/4
Multiply r/m word by 2, once
2/15
2/15
SHL
r/m16,CL
D3
/4
Multiply r/m word by 2, CL times
5+
n/17+n
5+
n/17+n
SHL
r/m16,imm8
C1
/4 ib
Multiply r/m word by 2, imm8 times
5+
n/17+n
5+
n/17+n
Содержание Am186 Series
Страница 1: ...Am186 and Am188 Family Instruction Set Manual February 1997...
Страница 10: ...Table of Contents x...
Страница 18: ...Programming 1 8...
Страница 40: ...Instruction Set Listing 3 14...