Cirrus Logic CS485 Manual de usuario descargar pdf (Pagina 15)

CS485G Spring 2015 15

(d) Purpose: translate p = &x[i]

(e) Purpose: compute arithmetic expressions like x+k

y where k is

1, 2, 4, or 8.

i. Example: x

ii. leal (%eax,%eax,2), %eax # x = x+2x

sall $2, %eax # x = x << 2

19 Arithmetic operations

1. Two-operand instructions

instruction meaning

addl dest = dest + src

subl dest = dest − src

imull dest = dest × src

sall dest = dest << src

sarl dest = dest >> src (arithmetic)

shrl dest = dest >> src (logical)

xorl dest = dest ⊕ src (bitwise)

andl dest = dest ∧ src (bitwise)

orl dest = dest ∨ src (bitwise)

2. Lecture 10, 2/6/2015

3. Be careful of parameter order for asymmetric operations.

4. There is no distinction between signed and unsigned integers.

5. One-operand instructions

instruction meaning

incl dest = dest + 1

decl dest = dest − 1

negl dest = −dest

notl dest = ¬ dest (bitwise)

6. Example

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 66 67

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Cirrus Logic CS485 Manual de usuario Pagina 15