#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*/ FILE;

/* Variables and functions */
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/ *, char *);
int /*<<< orphan*/ perror(char *);
void save_settings() {
  FILE *f = fopen("/tmp/file", "w");
  if (!f) {
    perror("fopen:");
  }
  fprintf(f, "Hello!");
  fprintf(f, " World!");
  fclose(f);
}


x86 assembly (clang, -O0):
<save_settings>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
lea    0xeb1(%rip),%rdi
lea    0xeb4(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,-0x8(%rbp)
cmpq   $0x0,-0x8(%rbp)
jne    1176 <save_settings+0x36>
lea    0xe9b(%rip),%rdi
call   1060 <perror@plt>
mov    -0x8(%rbp),%rdi
lea    0xe92(%rip),%rsi
call   1040 <fprintf@plt>
mov    -0x8(%rbp),%rdi
lea    0xe89(%rip),%rsi
call   1040 <fprintf@plt>
mov    -0x8(%rbp),%rdi
call   1030 <fclose@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<save_settings>:
push   %rbx
lea    0xeb8(%rip),%rdi
lea    0xebb(%rip),%rsi
call   1040 <fopen@plt>
mov    %rax,%rbx
test   %rax,%rax
je     1197 <save_settings+0x57>
lea    0xeb0(%rip),%rdi
mov    $0x6,%esi
mov    $0x1,%edx
mov    %rbx,%rcx
call   1060 <fwrite@plt>
lea    0xe9e(%rip),%rdi
mov    $0x7,%esi
mov    $0x1,%edx
mov    %rbx,%rcx
call   1060 <fwrite@plt>
mov    %rbx,%rdi
pop    %rbx
jmp    1030 <fclose@plt>
lea    0xe6e(%rip),%rdi
call   1050 <perror@plt>
jmp    115c <save_settings+0x1c>

LLVM IR (-O0):
@.str = [10 x i8] c"/tmp/file\00"
@.str.1 = [2 x i8] c"w\00"
@.str.2 = [7 x i8] c"fopen:\00"
@.str.3 = [7 x i8] c"Hello!\00"
@.str.4 = [8 x i8] c" World!\00"
define void @save_settings() {
%1 = alloca i32*
%2 = call i32* @fopen(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
store i32* %2, i32** %1
%3 = load i32*, i32** %1
%4 = icmp ne i32* %3, null
br i1 %4, label %7, label %5
5: ; preds = %0
%6 = call i32 @perror(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.2, i64 0, i64 0))
br label %7
7: ; preds = %5, %0
%8 = load i32*, i32** %1
%9 = call i32 @fprintf(i32* %8, i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.3, i64 0, i64 0))
%10 = load i32*, i32** %1
%11 = call i32 @fprintf(i32* %10, i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.4, i64 0, i64 0))
%12 = load i32*, i32** %1
%13 = call i32 @fclose(i32* %12)
ret void
}

LLVM IR (-O2):
@.str = [10 x i8] c"/tmp/file\00"
@.str.1 = [2 x i8] c"w\00"
@.str.2 = [7 x i8] c"fopen:\00"
@.str.3 = [7 x i8] c"Hello!\00"
@.str.4 = [8 x i8] c" World!\00"
define void @save_settings() {
%1 = tail call i32* @fopen(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
%2 = icmp eq i32* %1, null
br i1 %2, label %3, label %5
3: ; preds = %0
%4 = tail call i32 @perror(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.2, i64 0, i64 0))
br label %5
5: ; preds = %3, %0
%6 = tail call i64 @fwrite(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.3, i64 0, i64 0), i64 6, i64 1, i32* %1)
%7 = tail call i64 @fwrite(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.4, i64 0, i64 0), i64 7, i64 1, i32* %1)
%8 = tail call i32 @fclose(i32* %1)
ret void
}