#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 strlen(char *);
void reverse(char *str) {
  for (char *i = str, *j = str + strlen(str) - 1; i < j; ++i, --j) {
    char tmp = *i;
    *i = *j;
    *j = tmp;
  }
}


x86 assembly (clang, -O0):
<reverse>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rax
mov    %rax,-0x10(%rbp)
mov    -0x8(%rbp),%rax
mov    %rax,-0x28(%rbp)
mov    -0x8(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,%ecx
mov    -0x28(%rbp),%rax
movslq %ecx,%rcx
add    %rcx,%rax
add    $0xffffffffffffffff,%rax
mov    %rax,-0x18(%rbp)
mov    -0x10(%rbp),%rax
cmp    -0x18(%rbp),%rax
jae    1192 <reverse+0x82>
mov    -0x10(%rbp),%rax
mov    (%rax),%al
mov    %al,-0x19(%rbp)
mov    -0x18(%rbp),%rax
mov    (%rax),%cl
mov    -0x10(%rbp),%rax
mov    %cl,(%rax)
mov    -0x19(%rbp),%cl
mov    -0x18(%rbp),%rax
mov    %cl,(%rax)
mov    -0x10(%rbp),%rax
add    $0x1,%rax
mov    %rax,-0x10(%rbp)
mov    -0x18(%rbp),%rax
add    $0xffffffffffffffff,%rax
mov    %rax,-0x18(%rbp)
jmp    1149 <reverse+0x39>
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<reverse>:
push   %rbx
mov    %rdi,%rbx
call   1030 <strlen@plt>
cltq
add    %rbx,%rax
add    $0xffffffffffffffff,%rax
cmp    %rbx,%rax
jbe    114c <reverse+0x3c>
add    $0x1,%rbx
nopl   0x0(%rax,%rax,1)
movzbl -0x1(%rbx),%ecx
movzbl (%rax),%edx
mov    %dl,-0x1(%rbx)
mov    %cl,(%rax)
add    $0xffffffffffffffff,%rax
lea    0x1(%rbx),%rcx
cmp    %rax,%rbx
mov    %rcx,%rbx
jb     1130 <reverse+0x20>
pop    %rbx
ret

LLVM IR (-O0):
define void @reverse(i8* %0) {
%2 = alloca i8*
%3 = alloca i8*
%4 = alloca i8*
%5 = alloca i8
store i8* %0, i8** %2
%6 = load i8*, i8** %2
store i8* %6, i8** %3
%7 = load i8*, i8** %2
%8 = load i8*, i8** %2
%9 = call i32 @strlen(i8* %8)
%10 = sext i32 %9 to i64
%11 = getelementptr inbounds i8, i8* %7, i64 %10
%12 = getelementptr inbounds i8, i8* %11, i64 -1
store i8* %12, i8** %4
br label %13
13: ; preds = %25, %1
%14 = load i8*, i8** %3
%15 = load i8*, i8** %4
%16 = icmp ult i8* %14, %15
br i1 %16, label %17, label %30
17: ; preds = %13
%18 = load i8*, i8** %3
%19 = load i8, i8* %18
store i8 %19, i8* %5
%20 = load i8*, i8** %4
%21 = load i8, i8* %20
%22 = load i8*, i8** %3
store i8 %21, i8* %22
%23 = load i8, i8* %5
%24 = load i8*, i8** %4
store i8 %23, i8* %24
br label %25
25: ; preds = %17
%26 = load i8*, i8** %3
%27 = getelementptr inbounds i8, i8* %26, i32 1
store i8* %27, i8** %3
%28 = load i8*, i8** %4
%29 = getelementptr inbounds i8, i8* %28, i32 -1
store i8* %29, i8** %4
br label %13
30: ; preds = %13
ret void
}

LLVM IR (-O2):
define void @reverse(i8* %0) {
%2 = tail call i32 @strlen(i8* %0)
%3 = sext i32 %2 to i64
%4 = getelementptr inbounds i8, i8* %0, i64 %3
%5 = getelementptr inbounds i8, i8* %4, i64 -1
%6 = icmp ugt i8* %5, %0
br i1 %6, label %8, label %7
7: ; preds = %8, %1
ret void
8: ; preds = %1, %8
%9 = phi i8* [ %14, %8 ], [ %5, %1 ]
%10 = phi i8* [ %13, %8 ], [ %0, %1 ]
%11 = load i8, i8* %10
%12 = load i8, i8* %9
store i8 %12, i8* %10
store i8 %11, i8* %9
%13 = getelementptr inbounds i8, i8* %10, i64 1
%14 = getelementptr inbounds i8, i8* %9, i64 -1
%15 = icmp ult i8* %13, %14
br i1 %15, label %8, label %7
}