#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 */
typedef int /*<<< orphan*/ s;
typedef int /*<<< orphan*/ FILE;

/* Variables and functions */
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fgets(char *, int, int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ printf(char *, char *);
void display() {
  FILE *fp = fopen("/Users/ChenXin/Downloads/book.txt", "r");
  char s[10];
  while (fgets(s, sizeof(s), fp) != NULL)
    printf("%s", s);
  fclose(fp);
}


x86 assembly (clang, -O0):
<display>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
lea    0xeb1(%rip),%rdi
lea    0xecc(%rip),%rsi
call   1060 <fopen@plt>
mov    %rax,-0x8(%rbp)
lea    -0x12(%rbp),%rdi
mov    -0x8(%rbp),%rdx
mov    $0xa,%esi
call   1050 <fgets@plt>
cmp    $0x0,%rax
je     1190 <display+0x50>
lea    -0x12(%rbp),%rsi
lea    0xe9e(%rip),%rdi
call   1040 <printf@plt>
jmp    115f <display+0x1f>
mov    -0x8(%rbp),%rdi
call   1030 <fclose@plt>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<display>:
push   %r15
push   %r14
push   %rbx
sub    $0x10,%rsp
lea    0xeb0(%rip),%rdi
lea    0xecb(%rip),%rsi
call   1060 <fopen@plt>
mov    %rax,%r15
lea    0x6(%rsp),%rdi
mov    $0xa,%esi
mov    %rax,%rdx
call   1050 <fgets@plt>
test   %rax,%rax
je     11b0 <display+0x70>
lea    0xea7(%rip),%r14
lea    0x6(%rsp),%rbx
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax)
mov    %r14,%rdi
mov    %rbx,%rsi
call   1040 <printf@plt>
mov    %rbx,%rdi
mov    $0xa,%esi
mov    %r15,%rdx
call   1050 <fgets@plt>
test   %rax,%rax
jne    1190 <display+0x50>
mov    %r15,%rdi
call   1030 <fclose@plt>
add    $0x10,%rsp
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [34 x i8] c"/Users/ChenXin/Downloads/book.txt\00"
@.str.1 = [2 x i8] c"r\00"
@.str.2 = [3 x i8] c"%s\00"
define void @display() {
%1 = alloca i32*
%2 = alloca [10 x i8]
%3 = call i32* @fopen(i8* getelementptr inbounds ([34 x i8], [34 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
store i32* %3, i32** %1
br label %4
4: ; preds = %9, %0
%5 = getelementptr inbounds [10 x i8], [10 x i8]* %2, i64 0, i64 0
%6 = load i32*, i32** %1
%7 = call i32* @fgets(i8* %5, i32 10, i32* %6)
%8 = icmp ne i32* %7, null
br i1 %8, label %9, label %12
9: ; preds = %4
%10 = getelementptr inbounds [10 x i8], [10 x i8]* %2, i64 0, i64 0
%11 = call i32 @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i8* %10)
br label %4
12: ; preds = %4
%13 = load i32*, i32** %1
%14 = call i32 @fclose(i32* %13)
ret void
}

LLVM IR (-O2):
@.str = [34 x i8] c"/Users/ChenXin/Downloads/book.txt\00"
@.str.1 = [2 x i8] c"r\00"
@.str.2 = [3 x i8] c"%s\00"
define void @display() {
%1 = alloca [10 x i8]
%2 = tail call i32* @fopen(i8* getelementptr inbounds ([34 x i8], [34 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
%3 = getelementptr inbounds [10 x i8], [10 x i8]* %1, i64 0, i64 0
%4 = call i32* @fgets(i8* %3, i32 10, i32* %2)
%5 = icmp eq i32* %4, null
br i1 %5, label %10, label %6
6: ; preds = %0, %6
%7 = call i32 @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i8* %3)
%8 = call i32* @fgets(i8* %3, i32 10, i32* %2)
%9 = icmp eq i32* %8, null
br i1 %9, label %10, label %6
10: ; preds = %6, %0
%11 = call i32 @fclose(i32* %2)
ret void
}