#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*/ printf(char *, ...);
int main(int argc, char *argv[]) {
  int i;
  printf("Command line arguments:\n");
  for (i = 0; i < argc; i++)
    printf("\targv[%d]: %s\n", i, argv[i]);
  printf("\n");
  printf("Environment variables:\n");
  extern char **environ;
  for (i = 0; environ[i] != NULL; i++)
    printf("\tenvp[%2d]: %s\n", i, environ[i]);
  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)
lea    0xed3(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x0,-0x14(%rbp)
mov    -0x14(%rbp),%eax
cmp    -0x8(%rbp),%eax
jge    1172 <main+0x62>
mov    -0x14(%rbp),%esi
mov    -0x10(%rbp),%rax
movslq -0x14(%rbp),%rcx
mov    (%rax,%rcx,8),%rdx
lea    0xebc(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    113b <main+0x2b>
lea    0xec5(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xea1(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x0,-0x14(%rbp)
mov    0x2e4c(%rip),%rax
mov    (%rax),%rax
movslq -0x14(%rbp),%rcx
cmpq   $0x0,(%rax,%rcx,8)
je     11df <main+0xcf>
mov    -0x14(%rbp),%esi
mov    0x2e30(%rip),%rax
mov    (%rax),%rax
movslq -0x14(%rbp),%rcx
mov    (%rax,%rcx,8),%rdx
lea    0xe76(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    1195 <main+0x85>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %r12
push   %rbx
push   %rax
mov    %rsi,%r15
mov    %edi,%ebx
lea    0xedb(%rip),%rdi
call   1040 <puts@plt>
test   %ebx,%ebx
jle    1179 <main+0x49>
mov    %ebx,%r12d
lea    0xea9(%rip),%r14
xor    %ebx,%ebx
nopl   0x0(%rax)
mov    (%r15,%rbx,8),%rdx
mov    %r14,%rdi
mov    %ebx,%esi
xor    %eax,%eax
call   1050 <printf@plt>
add    $0x1,%rbx
cmp    %rbx,%r12
jne    1160 <main+0x30>
mov    $0xa,%edi
call   1030 <putchar@plt>
lea    0xead(%rip),%rdi
call   1040 <puts@plt>
mov    0x2e52(%rip),%r15
mov    (%r15),%rax
mov    (%rax),%rdx
test   %rdx,%rdx
je     11cd <main+0x9d>
lea    0xe67(%rip),%r14
xor    %ebx,%ebx
nopw   0x0(%rax,%rax,1)
mov    %r14,%rdi
mov    %ebx,%esi
xor    %eax,%eax
call   1050 <printf@plt>
mov    (%r15),%rax
mov    0x8(%rax,%rbx,8),%rdx
add    $0x1,%rbx
test   %rdx,%rdx
jne    11b0 <main+0x80>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [25 x i8] c"Command line arguments:\0A\00"
@.str.1 = [15 x i8] c"\09argv[%d]: %s\0A\00"
@.str.2 = [2 x i8] c"\0A\00"
@.str.3 = [24 x i8] c"Environment variables:\0A\00"
@environ = external global i8**
@.str.4 = [16 x i8] c"\09envp[%2d]: %s\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%7 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str, i64 0, i64 0))
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 ([15 x i8], [15 x i8]* @.str.1, 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 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0))
%25 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.3, i64 0, i64 0))
store i32 0, i32* %6
br label %26
26: ; preds = %41, %23
%27 = load i8**, i8*** @environ
%28 = load i32, i32* %6
%29 = sext i32 %28 to i64
%30 = getelementptr inbounds i8*, i8** %27, i64 %29
%31 = load i8*, i8** %30
%32 = icmp ne i8* %31, null
br i1 %32, label %33, label %44
33: ; preds = %26
%34 = load i32, i32* %6
%35 = load i8**, i8*** @environ
%36 = load i32, i32* %6
%37 = sext i32 %36 to i64
%38 = getelementptr inbounds i8*, i8** %35, i64 %37
%39 = load i8*, i8** %38
%40 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.4, i64 0, i64 0), i32 %34, i8* %39)
br label %41
41: ; preds = %33
%42 = load i32, i32* %6
%43 = add nsw i32 %42, 1
store i32 %43, i32* %6
br label %26
44: ; preds = %26
ret i32 0
}

LLVM IR (-O2):
@.str.1 = [15 x i8] c"\09argv[%d]: %s\0A\00"
@environ = external global i8**
@.str.4 = [16 x i8] c"\09envp[%2d]: %s\0A\00"
@str = [24 x i8] c"Command line arguments:\00"
@str.5 = [23 x i8] c"Environment variables:\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([24 x i8], [24 x i8]* @str, i64 0, i64 0))
%4 = icmp sgt i32 %0, 0
br i1 %4, label %5, label %15
5: ; preds = %2
%6 = zext i32 %0 to i64
br label %7
7: ; preds = %5, %7
%8 = phi i64 [ 0, %5 ], [ %13, %7 ]
%9 = getelementptr inbounds i8*, i8** %1, i64 %8
%10 = load i8*, i8** %9
%11 = trunc i64 %8 to i32
%12 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([15 x i8], [15 x i8]* @.str.1, i64 0, i64 0), i32 %11, i8* %10)
%13 = add nuw nsw i64 %8, 1
%14 = icmp eq i64 %13, %6
br i1 %14, label %15, label %7
15: ; preds = %7, %2
%16 = tail call i32 @putchar(i32 10)
%17 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([23 x i8], [23 x i8]* @str.5, i64 0, i64 0))
%18 = load i8**, i8*** @environ
%19 = load i8*, i8** %18
%20 = icmp eq i8* %19, null
br i1 %20, label %31, label %21
21: ; preds = %15, %21
%22 = phi i64 [ %26, %21 ], [ 0, %15 ]
%23 = phi i8* [ %29, %21 ], [ %19, %15 ]
%24 = trunc i64 %22 to i32
%25 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([16 x i8], [16 x i8]* @.str.4, i64 0, i64 0), i32 %24, i8* %23)
%26 = add nuw i64 %22, 1
%27 = load i8**, i8*** @environ
%28 = getelementptr inbounds i8*, i8** %27, i64 %26
%29 = load i8*, i8** %28
%30 = icmp eq i8* %29, null
br i1 %30, label %31, label %21
31: ; preds = %21, %15
ret i32 0
}