#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
int write(int, unsigned char *, int);
int serial_writen(int sid, unsigned char *buf, int size) {
  int i, n = 0;
  for (i = 0; i < size; i++) {
    n = write(sid, &buf[i], 1);
    if (n < 0)
      return (1);
  }
  return (0);
}


x86 assembly (clang, -O0):
<serial_writen>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    %edx,-0x14(%rbp)
movl   $0x0,-0x1c(%rbp)
movl   $0x0,-0x18(%rbp)
mov    -0x18(%rbp),%eax
cmp    -0x14(%rbp),%eax
jge    1180 <serial_writen+0x70>
mov    -0x8(%rbp),%edi
mov    -0x10(%rbp),%rsi
movslq -0x18(%rbp),%rax
add    %rax,%rsi
mov    $0x1,%edx
call   1030 <write@plt>
mov    %eax,-0x1c(%rbp)
cmpl   $0x0,-0x1c(%rbp)
jge    116d <serial_writen+0x5d>
movl   $0x1,-0x4(%rbp)
jmp    1187 <serial_writen+0x77>
jmp    1172 <serial_writen+0x62>
mov    -0x18(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x18(%rbp)
jmp    1130 <serial_writen+0x20>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<serial_writen>:
push   %rbp
push   %r15
push   %r14
push   %rbx
push   %rax
test   %edx,%edx
jle    114e <serial_writen+0x3e>
mov    %rsi,%rbx
mov    %edi,%r14d
mov    %edx,%ebp
mov    $0x1,%r15d
nopl   0x0(%rax)
mov    %r14d,%edi
mov    %rbx,%rsi
mov    $0x1,%edx
call   1030 <write@plt>
test   %eax,%eax
js     1151 <serial_writen+0x41>
add    $0x1,%rbx
add    $0xffffffffffffffff,%rbp
jne    1130 <serial_writen+0x20>
xor    %r15d,%r15d
mov    %r15d,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
define i32 @serial_writen(i32 %0, i8* %1, i32 %2) {
%4 = alloca i32
%5 = alloca i32
%6 = alloca i8*
%7 = alloca i32
%8 = alloca i32
%9 = alloca i32
store i32 %0, i32* %5
store i8* %1, i8** %6
store i32 %2, i32* %7
store i32 0, i32* %9
store i32 0, i32* %8
br label %10
10: ; preds = %25, %3
%11 = load i32, i32* %8
%12 = load i32, i32* %7
%13 = icmp slt i32 %11, %12
br i1 %13, label %14, label %28
14: ; preds = %10
%15 = load i32, i32* %5
%16 = load i8*, i8** %6
%17 = load i32, i32* %8
%18 = sext i32 %17 to i64
%19 = getelementptr inbounds i8, i8* %16, i64 %18
%20 = call i32 @write(i32 %15, i8* %19, i32 1)
store i32 %20, i32* %9
%21 = load i32, i32* %9
%22 = icmp slt i32 %21, 0
br i1 %22, label %23, label %24
23: ; preds = %14
store i32 1, i32* %4
br label %29
24: ; preds = %14
br label %25
25: ; preds = %24
%26 = load i32, i32* %8
%27 = add nsw i32 %26, 1
store i32 %27, i32* %8
br label %10
28: ; preds = %10
store i32 0, i32* %4
br label %29
29: ; preds = %28, %23
%30 = load i32, i32* %4
ret i32 %30
}

LLVM IR (-O2):
define i32 @serial_writen(i32 %0, i8* nocapture %1, i32 %2) {
%4 = icmp sgt i32 %2, 0
br i1 %4, label %5, label %15
5: ; preds = %3
%6 = zext i32 %2 to i64
br label %9
7: ; preds = %9
%8 = icmp eq i64 %14, %6
br i1 %8, label %15, label %9
9: ; preds = %5, %7
%10 = phi i64 [ 0, %5 ], [ %14, %7 ]
%11 = getelementptr inbounds i8, i8* %1, i64 %10
%12 = tail call i32 @write(i32 %0, i8* %11, i32 1)
%13 = icmp slt i32 %12, 0
%14 = add nuw nsw i64 %10, 1
br i1 %13, label %15, label %7
15: ; preds = %9, %7, %3
%16 = phi i32 [ 0, %3 ], [ 0, %7 ], [ 1, %9 ]
ret i32 %16
}