CODE:

/*Enumerated Type creates set of constants numbered 0 and upward*/

/* *p1 = rdi, *p2 = rsi, modetype = rdx */

typedef enum {ACASE, BCASE, CCASE, DCASE, ECASE} modetype;

long switch4 (long *p1, long *p2, modetype action) {

long result =0; switch (action){

case ACASE:

case BCASE:

case CCASE:

case DCASE:

case ECASE:

default:

}

return result;

}

Assembly code:

switch4: .LFB0: .cfi_startproc movl $2, %eax cmpl $4, %edx ja .L2 movl %edx, %edx jmp *.L8(,%rdx,8) .section .rodata .align 8 .align 4 .L8: .quad .L3 .quad .L4 .quad .L5 .quad .L6 .quad .L7 .text .L7: movl $24, %eax ret .L3: movq (%rdi), %rax subq (%rsi), %rax movq %rax, (%rsi) ret .L4: movq $31, (%rdi) movq (%rsi), %rax ret .L5: movq (%rdi), %rax movq %rax, %rdx addq (%rsi), %rdx movq %rdx, (%rdi) ret .L6: movq (%rsi), %rax movq %rax, (%rdi) movl $24, %eax .L2: rep ret .cfi_endproc .LFE0: .size switch4, .-switch4 .ident "GCC: (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3" .section .note.GNU-stack,"",@progbits

Use the assembly code to fill out the code for each cases above

if possible, please explain how you used assembly code to write out the cases