#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*/ err(int, char *);
int /*<<< orphan*/ execve(char *, char **, int /*<<< orphan*/ *);
int /*<<< orphan*/ exit(int);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char *);
int /*<<< orphan*/ stderr;
int main(int argc, char **argv) {
  if (argc != 2) {
    fprintf(stderr, "usage: %s <progname>\n", argv[0]);
    exit(2);
  }
  execve(argv[1], &argv[1], NULL);
  err(1, "");
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %edi,-0x4(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x2,-0x4(%rbp)
je     117f <main+0x3f>
mov    0x2e80(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rax
mov    (%rax),%rdx
lea    0xe90(%rip),%rsi
call   1040 <fprintf@plt>
mov    $0x2,%edi
call   1060 <exit@plt>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
mov    -0x10(%rbp),%rsi
add    $0x8,%rsi
xor    %eax,%eax
mov    %eax,%edx
call   1030 <execve@plt>
mov    $0x1,%edi
lea    0xe71(%rip),%rsi
call   1050 <err@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
cmp    $0x2,%edi
jne    116a <main+0x2a>
mov    0x8(%rsi),%rdi
add    $0x8,%rsi
xor    %edx,%edx
call   1030 <execve@plt>
lea    0xeb9(%rip),%rsi
mov    $0x1,%edi
call   1050 <err@plt>
xor    %eax,%eax
pop    %rcx
ret
mov    0x2e6f(%rip),%rax
mov    (%rax),%edi
mov    (%rsi),%rdx
lea    0xe83(%rip),%rsi
call   1040 <fprintf@plt>
mov    $0x2,%edi
call   1060 <exit@plt>

LLVM IR (-O0):
@stderr = global i32 0
@.str = [22 x i8] c"usage: %s <progname>\0A\00"
@.str.1 = [1 x i8] zeroinitializer
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i8**
store i32 %0, i32* %3
store i8** %1, i8*** %4
%5 = load i32, i32* %3
%6 = icmp ne i32 %5, 2
br i1 %6, label %7, label %14
7: ; preds = %2
%8 = load i32, i32* @stderr
%9 = load i8**, i8*** %4
%10 = getelementptr inbounds i8*, i8** %9, i64 0
%11 = load i8*, i8** %10
%12 = call i32 @fprintf(i32 %8, i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str, i64 0, i64 0), i8* %11)
%13 = call i32 @exit(i32 2)
unreachable
14: ; preds = %2
%15 = load i8**, i8*** %4
%16 = getelementptr inbounds i8*, i8** %15, i64 1
%17 = load i8*, i8** %16
%18 = load i8**, i8*** %4
%19 = getelementptr inbounds i8*, i8** %18, i64 1
%20 = call i32 @execve(i8* %17, i8** %19, i32* null)
%21 = call i32 @err(i32 1, i8* getelementptr inbounds ([1 x i8], [1 x i8]* @.str.1, i64 0, i64 0))
ret i32 0
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [22 x i8] c"usage: %s <progname>\0A\00"
@.str.1 = [1 x i8] zeroinitializer
define i32 @main(i32 %0, i8** %1) {
%3 = icmp eq i32 %0, 2
br i1 %3, label %9, label %4
4: ; preds = %2
%5 = load i32, i32* @stderr
%6 = load i8*, i8** %1
%7 = tail call i32 @fprintf(i32 %5, i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str, i64 0, i64 0), i8* %6)
%8 = tail call i32 @exit(i32 2)
unreachable
9: ; preds = %2
%10 = getelementptr inbounds i8*, i8** %1, i64 1
%11 = load i8*, i8** %10
%12 = tail call i32 @execve(i8* %11, i8** %10, i32* null)
%13 = tail call i32 @err(i32 1, i8* getelementptr inbounds ([1 x i8], [1 x i8]* @.str.1, i64 0, i64 0))
ret i32 0
}