#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*/ printf(char *, ...);
int main(int argc, char *argv[]) {
  int i;
  char **ptr;
  extern char **environ;
  for (i = 0; i < argc; i++)
    printf("argv[%d]: %s\n", i, argv[i]);
  for (ptr = environ; *ptr != 0; ptr++)
    printf("%s\n", *ptr);
  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   $0x0,-0x14(%rbp)
mov    -0x14(%rbp),%eax
cmp    -0x8(%rbp),%eax
jge    1174 <main+0x54>
mov    -0x14(%rbp),%esi
mov    -0x10(%rbp),%rax
movslq -0x14(%rbp),%rcx
mov    (%rax,%rcx,8),%rdx
lea    0xea1(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    113d <main+0x1d>
mov    0x2e6d(%rip),%rax
mov    (%rax),%rax
mov    %rax,-0x20(%rbp)
mov    -0x20(%rbp),%rax
cmpq   $0x0,(%rax)
je     11b6 <main+0x96>
mov    -0x20(%rbp),%rax
mov    (%rax),%rsi
lea    0xe6c(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x20(%rbp),%rax
add    $0x8,%rax
mov    %rax,-0x20(%rbp)
jmp    1182 <main+0x62>
xor    %edi,%edi
call   1040 <exit@plt>

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %r12
push   %rbx
push   %rax
test   %edi,%edi
jle    1169 <main+0x39>
mov    %rsi,%r15
mov    %edi,%r12d
lea    0xeb7(%rip),%r14
xor    %ebx,%ebx
nopl   0x0(%rax,%rax,1)
mov    (%r15,%rbx,8),%rdx
mov    %r14,%rdi
mov    %ebx,%esi
xor    %eax,%eax
call   1040 <printf@plt>
add    $0x1,%rbx
cmp    %rbx,%r12
jne    1150 <main+0x20>
mov    0x2e78(%rip),%rax
mov    (%rax),%rbx
mov    (%rbx),%rdi
test   %rdi,%rdi
je     1191 <main+0x61>
add    $0x8,%rbx
nop
call   1030 <puts@plt>
mov    (%rbx),%rdi
add    $0x8,%rbx
test   %rdi,%rdi
jne    1180 <main+0x50>
xor    %edi,%edi
call   1050 <exit@plt>

LLVM IR (-O0):
@.str = [14 x i8] c"argv[%d]: %s\0A\00"
@environ = external global i8**
@.str.1 = [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 0, i32* %6
br label %8
8: ; preds = %20, %2
%9 = load i32, i32* %6
%10 = load i32, i32* %4
%11 = icmp slt i32 %9, %10
br i1 %11, label %12, label %23
12: ; preds = %8
%13 = load i32, i32* %6
%14 = load i8**, i8*** %5
%15 = load i32, i32* %6
%16 = sext i32 %15 to i64
%17 = getelementptr inbounds i8*, i8** %14, i64 %16
%18 = load i8*, i8** %17
%19 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str, i64 0, i64 0), i32 %13, i8* %18)
br label %20
20: ; preds = %12
%21 = load i32, i32* %6
%22 = add nsw i32 %21, 1
store i32 %22, i32* %6
br label %8
23: ; preds = %8
%24 = load i8**, i8*** @environ
store i8** %24, i8*** %7
br label %25
25: ; preds = %33, %23
%26 = load i8**, i8*** %7
%27 = load i8*, i8** %26
%28 = icmp ne i8* %27, null
br i1 %28, label %29, label %36
29: ; preds = %25
%30 = load i8**, i8*** %7
%31 = load i8*, i8** %30
%32 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i8* %31)
br label %33
33: ; preds = %29
%34 = load i8**, i8*** %7
%35 = getelementptr inbounds i8*, i8** %34, i32 1
store i8** %35, i8*** %7
br label %25
36: ; preds = %25
%37 = call i32 @exit(i32 0)
unreachable
}

LLVM IR (-O2):
@.str = [14 x i8] c"argv[%d]: %s\0A\00"
@environ = external global i8**
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp sgt i32 %0, 0
br i1 %3, label %4, label %14
4: ; preds = %2
%5 = zext i32 %0 to i64
br label %6
6: ; preds = %4, %6
%7 = phi i64 [ 0, %4 ], [ %12, %6 ]
%8 = getelementptr inbounds i8*, i8** %1, i64 %7
%9 = load i8*, i8** %8
%10 = trunc i64 %7 to i32
%11 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([14 x i8], [14 x i8]* @.str, i64 0, i64 0), i32 %10, i8* %9)
%12 = add nuw nsw i64 %7, 1
%13 = icmp eq i64 %12, %5
br i1 %13, label %14, label %6
14: ; preds = %6, %2
%15 = load i8**, i8*** @environ
%16 = load i8*, i8** %15
%17 = icmp eq i8* %16, null
br i1 %17, label %25, label %18
18: ; preds = %14, %18
%19 = phi i8* [ %23, %18 ], [ %16, %14 ]
%20 = phi i8** [ %22, %18 ], [ %15, %14 ]
%21 = tail call i32 @puts(i8* %19)
%22 = getelementptr inbounds i8*, i8** %20, i64 1
%23 = load i8*, i8** %22
%24 = icmp eq i8* %23, null
br i1 %24, label %25, label %18
25: ; preds = %18, %14
%26 = tail call i32 @exit(i32 0)
unreachable
}