#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 /*<<< orphan*/ exit(int /*<<< orphan*/);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *);
int /*<<< orphan*/ pr_exit(int);
int /*<<< orphan*/ stderr;
int system(char *);
int main(int argc, char *argv[]) {
  int status;
  if (argc < 2)
    fprintf(stderr, "command-line argument required");
  if ((status = system(argv[1])) < 0)
    fprintf(stderr, "system() error");
  pr_exit(status);
  exit(0);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x2,-0x8(%rbp)
jge    1175 <main+0x35>
mov    0x2e79(%rip),%rax
mov    (%rax),%edi
lea    0xe90(%rip),%rsi
call   1040 <fprintf@plt>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1030 <system@plt>
mov    %eax,-0x14(%rbp)
cmp    $0x0,%eax
jge    11a3 <main+0x63>
mov    0x2e4b(%rip),%rax
mov    (%rax),%edi
lea    0xe81(%rip),%rsi
call   1040 <fprintf@plt>
mov    -0x14(%rbp),%edi
call   1050 <pr_exit@plt>
xor    %edi,%edi
call   1060 <exit@plt>

x86 assembly (clang, -O2):
<main>:
push   %rbx
mov    %rsi,%rbx
cmp    $0x1,%edi
jg     115e <main+0x1e>
mov    0x2e90(%rip),%rax
mov    (%rax),%edi
lea    0xea7(%rip),%rsi
call   1040 <fprintf@plt>
mov    0x8(%rbx),%rdi
call   1030 <system@plt>
mov    %eax,%ebx
test   %eax,%eax
jns    1182 <main+0x42>
mov    0x2e6c(%rip),%rax
mov    (%rax),%edi
lea    0xea2(%rip),%rsi
call   1040 <fprintf@plt>
mov    %ebx,%edi
call   1050 <pr_exit@plt>
xor    %edi,%edi
call   1060 <exit@plt>

LLVM IR (-O0):
@stderr = global i32 0
@.str = [31 x i8] c"command-line argument required\00"
@.str.1 = [15 x i8] c"system() error\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%7 = load i32, i32* %4
%8 = icmp slt i32 %7, 2
br i1 %8, label %9, label %12
9: ; preds = %2
%10 = load i32, i32* @stderr
%11 = call i32 @fprintf(i32 %10, i8* getelementptr inbounds ([31 x i8], [31 x i8]* @.str, i64 0, i64 0))
br label %12
12: ; preds = %9, %2
%13 = load i8**, i8*** %5
%14 = getelementptr inbounds i8*, i8** %13, i64 1
%15 = load i8*, i8** %14
%16 = call i32 @system(i8* %15)
store i32 %16, i32* %6
%17 = icmp slt i32 %16, 0
br i1 %17, label %18, label %21
18: ; preds = %12
%19 = load i32, i32* @stderr
%20 = call i32 @fprintf(i32 %19, i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str.1, i64 0, i64 0))
br label %21
21: ; preds = %18, %12
%22 = load i32, i32* %6
%23 = call i32 @pr_exit(i32 %22)
%24 = call i32 @exit(i32 0)
unreachable
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [31 x i8] c"command-line argument required\00"
@.str.1 = [15 x i8] c"system() error\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp slt i32 %0, 2
br i1 %3, label %4, label %7
4: ; preds = %2
%5 = load i32, i32* @stderr
%6 = tail call i32 @fprintf(i32 %5, i8* getelementptr inbounds ([31 x i8], [31 x i8]* @.str, i64 0, i64 0))
br label %7
7: ; preds = %4, %2
%8 = getelementptr inbounds i8*, i8** %1, i64 1
%9 = load i8*, i8** %8
%10 = tail call i32 @system(i8* %9)
%11 = icmp slt i32 %10, 0
br i1 %11, label %12, label %15
12: ; preds = %7
%13 = load i32, i32* @stderr
%14 = tail call i32 @fprintf(i32 %13, i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str.1, i64 0, i64 0))
br label %15
15: ; preds = %12, %7
%16 = tail call i32 @pr_exit(i32 %10)
%17 = tail call i32 @exit(i32 0)
unreachable
}