ISA Priciples

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[!Note] with attendence as bonus

1 Instruction Set Principles

1.1 Architectures

• Stack Architecture
• Accumulator Architecture
• Register-Memory Architecture

[!Note] e.g. D = A * B - (A + C * B)

1.1.1 Stack Architecture

• Implicit Operands : on the Top Of the Stack (TOS)
• Simple example: 98 * (12 + 45)

PUSH 98
PUSH 12
PUSH 45
ADD
MUL

push A
push B
mul
push A
push C
push B
mul
add
sub
pop  D

1.1.2 Accumulator Architecture

• One implicit operand: the accumulator
• One explicit operand: mem location
• Accumulator is both an implicit input operand and a result

load  B
mul   C
add   A
store D
load  A
mul   B
sub   D
store D

1.1.3 Register-Memory Architectures

load  R1, A
mul   R1, B
load  R2, C
mul   R2, B
add   R2, A
store R2, D
sub   R1, D
store R1, D

1.1.4 Register Operands

Memory Operand Examples

1.1.5 Caller Saving and Callee Saving P484

叶子过程示例