#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 EXIT_FAILURE;
int EXIT_SUCCESS;
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *);
char *getenv(char *);
int /*<<< orphan*/ printf(char *, char *);
int /*<<< orphan*/ stdout;
int main(int argc, char *argv[]) {
  if (argc != 2) {
    fprintf(stdout, "Bitte geben Sie einen Variablennamen an!\n");
    return EXIT_FAILURE;
  } else {
    printf("%s\n", getenv(argv[1]));
  }
  return EXIT_SUCCESS;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x2,-0x8(%rbp)
je     1176 <main+0x46>
mov    0x2e81(%rip),%rax
mov    (%rax),%edi
lea    0xea0(%rip),%rsi
call   1050 <fprintf@plt>
mov    0x2e74(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x4(%rbp)
jmp    119e <main+0x6e>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1030 <getenv@plt>
mov    %rax,%rsi
lea    0xe9d(%rip),%rdi
call   1040 <printf@plt>
mov    0x2e37(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
cmp    $0x2,%edi
jne    1157 <main+0x27>
mov    0x8(%rsi),%rdi
call   1030 <getenv@plt>
lea    0xee4(%rip),%rdi
mov    %rax,%rsi
call   1040 <printf@plt>
mov    0x2e7b(%rip),%rax
jmp    1173 <main+0x43>
mov    0x2e7a(%rip),%rax
mov    (%rax),%edi
lea    0xe99(%rip),%rsi
call   1050 <fprintf@plt>
mov    0x2e6d(%rip),%rax
mov    (%rax),%eax
pop    %rcx
ret

LLVM IR (-O0):
@stdout = global i32 0
@.str = [42 x i8] c"Bitte geben Sie einen Variablennamen an!\0A\00"
@EXIT_FAILURE = global i32 0
@.str.1 = [4 x i8] c"%s\0A\00"
@EXIT_SUCCESS = global i32 0
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%6 = load i32, i32* %4
%7 = icmp ne i32 %6, 2
br i1 %7, label %8, label %12
8: ; preds = %2
%9 = load i32, i32* @stdout
%10 = call i32 @fprintf(i32 %9, i8* getelementptr inbounds ([42 x i8], [42 x i8]* @.str, i64 0, i64 0))
%11 = load i32, i32* @EXIT_FAILURE
store i32 %11, i32* %3
br label %20
12: ; preds = %2
%13 = load i8**, i8*** %5
%14 = getelementptr inbounds i8*, i8** %13, i64 1
%15 = load i8*, i8** %14
%16 = call i8* @getenv(i8* %15)
%17 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i8* %16)
br label %18
18: ; preds = %12
%19 = load i32, i32* @EXIT_SUCCESS
store i32 %19, i32* %3
br label %20
20: ; preds = %18, %8
%21 = load i32, i32* %3
ret i32 %21
}

LLVM IR (-O2):
@stdout = global i32 0
@.str = [42 x i8] c"Bitte geben Sie einen Variablennamen an!\0A\00"
@EXIT_FAILURE = global i32 0
@.str.1 = [4 x i8] c"%s\0A\00"
@EXIT_SUCCESS = global i32 0
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp eq i32 %0, 2
br i1 %3, label %7, label %4
4: ; preds = %2
%5 = load i32, i32* @stdout
%6 = tail call i32 @fprintf(i32 %5, i8* getelementptr inbounds ([42 x i8], [42 x i8]* @.str, i64 0, i64 0))
br label %12
7: ; preds = %2
%8 = getelementptr inbounds i8*, i8** %1, i64 1
%9 = load i8*, i8** %8
%10 = tail call i8* @getenv(i8* %9)
%11 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i8* %10)
br label %12
12: ; preds = %7, %4
%13 = phi i32* [ @EXIT_FAILURE, %4 ], [ @EXIT_SUCCESS, %7 ]
%14 = load i32, i32* %13
ret i32 %14
}