#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*/);
char *getenv(char *);
int /*<<< orphan*/ printf(char *, char *);
int main(int argc, char *argv[]) {
  int i;
  for (i = 1; i < argc; i++) {
    char *val = getenv(argv[i]);
    if (val)
      printf("%s\n", val);
  }
  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)
movl   $0x1,-0x14(%rbp)
mov    -0x14(%rbp),%eax
cmp    -0x8(%rbp),%eax
jge    119c <main+0x6c>
mov    -0x10(%rbp),%rax
movslq -0x14(%rbp),%rcx
mov    (%rax,%rcx,8),%rdi
call   1030 <getenv@plt>
mov    %rax,-0x20(%rbp)
cmpq   $0x0,-0x20(%rbp)
je     1189 <main+0x59>
mov    -0x20(%rbp),%rsi
lea    0xe7c(%rip),%rdi
call   1040 <printf@plt>
jmp    118e <main+0x5e>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    114d <main+0x1d>
xor    %edi,%edi
call   1050 <exit@plt>

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %r12
push   %rbx
push   %rax
cmp    $0x2,%edi
jl     1184 <main+0x54>
mov    %rsi,%r15
mov    %edi,%r12d
mov    $0x1,%ebx
lea    0xeb1(%rip),%r14
jmp    1169 <main+0x39>
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax,%rax,1)
add    $0x1,%rbx
cmp    %rbx,%r12
je     1184 <main+0x54>
mov    (%r15,%rbx,8),%rdi
call   1030 <getenv@plt>
test   %rax,%rax
je     1160 <main+0x30>
mov    %r14,%rdi
mov    %rax,%rsi
call   1040 <printf@plt>
jmp    1160 <main+0x30>
xor    %edi,%edi
call   1050 <exit@plt>

LLVM IR (-O0):
@.str = [4 x i8] c"%s\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
%7 = alloca i8*
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
store i32 1, i32* %6
br label %8
8: ; preds = %25, %2
%9 = load i32, i32* %6
%10 = load i32, i32* %4
%11 = icmp slt i32 %9, %10
br i1 %11, label %12, label %28
12: ; preds = %8
%13 = load i8**, i8*** %5
%14 = load i32, i32* %6
%15 = sext i32 %14 to i64
%16 = getelementptr inbounds i8*, i8** %13, i64 %15
%17 = load i8*, i8** %16
%18 = call i8* @getenv(i8* %17)
store i8* %18, i8** %7
%19 = load i8*, i8** %7
%20 = icmp ne i8* %19, null
br i1 %20, label %21, label %24
21: ; preds = %12
%22 = load i8*, i8** %7
%23 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8* %22)
br label %24
24: ; preds = %21, %12
br label %25
25: ; preds = %24
%26 = load i32, i32* %6
%27 = add nsw i32 %26, 1
store i32 %27, i32* %6
br label %8
28: ; preds = %8
%29 = call i32 @exit(i32 0)
unreachable
}

LLVM IR (-O2):
@.str = [4 x i8] c"%s\0A\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp sgt i32 %0, 1
br i1 %3, label %4, label %17
4: ; preds = %2
%5 = zext i32 %0 to i64
br label %6
6: ; preds = %4, %14
%7 = phi i64 [ 1, %4 ], [ %15, %14 ]
%8 = getelementptr inbounds i8*, i8** %1, i64 %7
%9 = load i8*, i8** %8
%10 = tail call i8* @getenv(i8* %9)
%11 = icmp eq i8* %10, null
br i1 %11, label %14, label %12
12: ; preds = %6
%13 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8* %10)
br label %14
14: ; preds = %12, %6
%15 = add nuw nsw i64 %7, 1
%16 = icmp eq i64 %15, %5
br i1 %16, label %17, label %6
17: ; preds = %14, %2
%18 = tail call i32 @exit(i32 0)
unreachable
}