#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 */
scalar_t__ getenv(char *);
int /*<<< orphan*/ printf(char *, ...);
int main(int argc, char *argv[]) {
  if (argc < 2) {
    printf("Pass at least one argument.\n");
    return 1;
  }
  printf("%s is at %p\n", argv[1], (void *)getenv(argv[1]));
  return 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    115a <main+0x3a>
lea    0xeb9(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
movl   $0x1,-0x4(%rbp)
jmp    118f <main+0x6f>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rax
mov    %rax,-0x18(%rbp)
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1030 <getenv@plt>
mov    -0x18(%rbp),%rsi
mov    %rax,%rdx
lea    0xe9c(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
push   %rax
cmp    $0x1,%edi
jg     114c <main+0x1c>
lea    0xecd(%rip),%rdi
call   1040 <puts@plt>
mov    $0x1,%ebx
jmp    116e <main+0x3e>
mov    0x8(%rsi),%r14
mov    %r14,%rdi
call   1030 <getenv@plt>
lea    0xea1(%rip),%rdi
xor    %ebx,%ebx
mov    %r14,%rsi
mov    %rax,%rdx
xor    %eax,%eax
call   1050 <printf@plt>
mov    %ebx,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [29 x i8] c"Pass at least one argument.\0A\00"
@.str.1 = [13 x i8] c"%s is at %p\0A\00"
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 slt i32 %6, 2
br i1 %7, label %8, label %10
8: ; preds = %2
%9 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str, i64 0, i64 0))
store i32 1, i32* %3
br label %20
10: ; preds = %2
%11 = load i8**, i8*** %5
%12 = getelementptr inbounds i8*, i8** %11, i64 1
%13 = load i8*, i8** %12
%14 = load i8**, i8*** %5
%15 = getelementptr inbounds i8*, i8** %14, i64 1
%16 = load i8*, i8** %15
%17 = call i64 @getenv(i8* %16)
%18 = inttoptr i64 %17 to i8*
%19 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.1, i64 0, i64 0), i8* %13, i8* %18)
store i32 0, i32* %3
br label %20
20: ; preds = %10, %8
%21 = load i32, i32* %3
ret i32 %21
}

LLVM IR (-O2):
@.str.1 = [13 x i8] c"%s is at %p\0A\00"
@str = [28 x i8] c"Pass at least one argument.\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp slt i32 %0, 2
br i1 %3, label %4, label %6
4: ; preds = %2
%5 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([28 x i8], [28 x i8]* @str, i64 0, i64 0))
br label %12
6: ; preds = %2
%7 = getelementptr inbounds i8*, i8** %1, i64 1
%8 = load i8*, i8** %7
%9 = tail call i64 @getenv(i8* %8)
%10 = inttoptr i64 %9 to i8*
%11 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str.1, i64 0, i64 0), i8* %8, i8* %10)
br label %12
12: ; preds = %6, %4
%13 = phi i32 [ 1, %4 ], [ 0, %6 ]
ret i32 %13
}