1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
|
#include <stdio.h>
/*
long sum(long *start, long count)
start in %rdi, count in %rsi
sum:
irmovq $8,%r8 Constant 8
irmovq $1,%r9 Constant 1
xorq %rax,%rax sum = 0
andq %rsi,%rsi Set cc
jmp test Goto test
loop:
mrmovq (%rdi), %r10 Get *start
xorq %r11, %r11 Constant 0
subq %r10, %r11 -x
jle add if x was positive, skip
rrmovq %r11, %r10 x = -x
add:
addq %r10,%rax Add to sum
addq %r8,%rdi start++
subq %r9,%rsi count--. Set CC
test:
jne loop Stop when 0
ret
*/
|
