#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 /*<<< orphan*/ reverse(char *);
int main(int argc, char *argv[]) {
  if (argc != 2) {
    printf("Usage: Reverse.exe input\nWhere input is a string to reverse");
    return 1;
  }
  printf("%s reversed is: ", argv[1]);
  reverse(argv[1]);
  printf("%s\n", argv[1]);
  return 0;
}


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     115a <main+0x3a>
lea    0xeb9(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
movl   $0x1,-0x4(%rbp)
jmp    119a <main+0x7a>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rsi
lea    0xed3(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1030 <reverse@plt>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rsi
lea    0xec1(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %rbx
push   %rax
cmp    $0x2,%edi
jne    1163 <main+0x33>
mov    %rsi,%rbx
mov    0x8(%rsi),%rsi
lea    0xef6(%rip),%rdi
xor    %ebp,%ebp
xor    %eax,%eax
call   1050 <printf@plt>
mov    0x8(%rbx),%rdi
call   1030 <reverse@plt>
mov    0x8(%rbx),%rdi
call   1040 <puts@plt>
jmp    1176 <main+0x46>
lea    0xe96(%rip),%rdi
xor    %eax,%eax
call   1050 <printf@plt>
mov    $0x1,%ebp
mov    %ebp,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@.str = [60 x i8] c"Usage: Reverse.exe input\0AWhere input is a string to reverse\00"
@.str.1 = [17 x i8] c"%s reversed is: \00"
@.str.2 = [4 x i8] c"%s\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 ne i32 %6, 2
br i1 %7, label %8, label %10
8: ; preds = %2
%9 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([60 x i8], [60 x i8]* @.str, i64 0, i64 0))
store i32 1, i32* %3
br label %23
10: ; preds = %2
%11 = load i8**, i8*** %5
%12 = getelementptr inbounds i8*, i8** %11, i64 1
%13 = load i8*, i8** %12
%14 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.1, i64 0, i64 0), i8* %13)
%15 = load i8**, i8*** %5
%16 = getelementptr inbounds i8*, i8** %15, i64 1
%17 = load i8*, i8** %16
%18 = call i32 @reverse(i8* %17)
%19 = load i8**, i8*** %5
%20 = getelementptr inbounds i8*, i8** %19, i64 1
%21 = load i8*, i8** %20
%22 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i8* %21)
store i32 0, i32* %3
br label %23
23: ; preds = %10, %8
%24 = load i32, i32* %3
ret i32 %24
}

LLVM IR (-O2):
@.str = [60 x i8] c"Usage: Reverse.exe input\0AWhere input is a string to reverse\00"
@.str.1 = [17 x i8] c"%s reversed is: \00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp eq i32 %0, 2
br i1 %3, label %6, label %4
4: ; preds = %2
%5 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([60 x i8], [60 x i8]* @.str, i64 0, i64 0))
br label %14
6: ; preds = %2
%7 = getelementptr inbounds i8*, i8** %1, i64 1
%8 = load i8*, i8** %7
%9 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([17 x i8], [17 x i8]* @.str.1, i64 0, i64 0), i8* %8)
%10 = load i8*, i8** %7
%11 = tail call i32 @reverse(i8* %10)
%12 = load i8*, i8** %7
%13 = tail call i32 @puts(i8* dereferenceable(1) %12)
br label %14
14: ; preds = %6, %4
%15 = phi i32 [ 1, %4 ], [ 0, %6 ]
ret i32 %15
}