#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 decrypt(char arr[], char key[]) {
  int i;
  for (i = 0; i < strlen(arr); i++) {
    arr[i] = arr[i] + key[i % strlen(key)] % 26;
  }
}


x86 assembly (clang, -O0):
<decrypt>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
movl   $0x0,-0x14(%rbp)
mov    -0x14(%rbp),%eax
mov    %eax,-0x18(%rbp)
mov    -0x8(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,%ecx
mov    -0x18(%rbp),%eax
cmp    %ecx,%eax
jge    11a4 <decrypt+0x94>
mov    -0x8(%rbp),%rax
movslq -0x14(%rbp),%rcx
movsbl (%rax,%rcx,1),%eax
mov    %eax,-0x1c(%rbp)
mov    -0x10(%rbp),%rax
mov    %rax,-0x28(%rbp)
mov    -0x14(%rbp),%eax
mov    %eax,-0x2c(%rbp)
mov    -0x10(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,%ecx
mov    -0x2c(%rbp),%eax
cltd
idiv   %ecx
mov    -0x28(%rbp),%rax
movslq %edx,%rcx
movsbl (%rax,%rcx,1),%eax
mov    $0x1a,%ecx
cltd
idiv   %ecx
mov    -0x1c(%rbp),%eax
add    %edx,%eax
mov    %al,%dl
mov    -0x8(%rbp),%rax
movslq -0x14(%rbp),%rcx
mov    %dl,(%rax,%rcx,1)
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    1127 <decrypt+0x17>
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<decrypt>:
push   %rbp
push   %r15
push   %r14
push   %rbx
push   %rax
mov    %rsi,%r14
mov    %rdi,%r15
call   1030 <strlen@plt>
test   %eax,%eax
jle    117e <decrypt+0x6e>
xor    %ebx,%ebx
nopl   0x0(%rax,%rax,1)
movzbl (%r15,%rbx,1),%ebp
mov    %r14,%rdi
call   1030 <strlen@plt>
mov    %eax,%ecx
mov    %ebx,%eax
cltd
idiv   %ecx
movsbl (%r14,%rdx,1),%eax
imul   $0x4f,%eax,%ecx
movzwl %cx,%edx
shr    $0xb,%ecx
shr    $0xf,%edx
add    %cl,%dl
movzbl %dl,%ecx
lea    (%rcx,%rcx,4),%edx
lea    (%rdx,%rdx,4),%edx
add    %ecx,%edx
sub    %dl,%al
add    %bpl,%al
mov    %al,(%r15,%rbx,1)
add    $0x1,%rbx
mov    %r15,%rdi
call   1030 <strlen@plt>
cltq
cmp    %rax,%rbx
jl     1130 <decrypt+0x20>
add    $0x8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
define void @decrypt(i8* %0, i8* %1) {
%3 = alloca i8*
%4 = alloca i8*
%5 = alloca i32
store i8* %0, i8** %3
store i8* %1, i8** %4
store i32 0, i32* %5
br label %6
6: ; preds = %34, %2
%7 = load i32, i32* %5
%8 = load i8*, i8** %3
%9 = call i32 @strlen(i8* %8)
%10 = icmp slt i32 %7, %9
br i1 %10, label %11, label %37
11: ; preds = %6
%12 = load i8*, i8** %3
%13 = load i32, i32* %5
%14 = sext i32 %13 to i64
%15 = getelementptr inbounds i8, i8* %12, i64 %14
%16 = load i8, i8* %15
%17 = sext i8 %16 to i32
%18 = load i8*, i8** %4
%19 = load i32, i32* %5
%20 = load i8*, i8** %4
%21 = call i32 @strlen(i8* %20)
%22 = srem i32 %19, %21
%23 = sext i32 %22 to i64
%24 = getelementptr inbounds i8, i8* %18, i64 %23
%25 = load i8, i8* %24
%26 = sext i8 %25 to i32
%27 = srem i32 %26, 26
%28 = add nsw i32 %17, %27
%29 = trunc i32 %28 to i8
%30 = load i8*, i8** %3
%31 = load i32, i32* %5
%32 = sext i32 %31 to i64
%33 = getelementptr inbounds i8, i8* %30, i64 %32
store i8 %29, i8* %33
br label %34
34: ; preds = %11
%35 = load i32, i32* %5
%36 = add nsw i32 %35, 1
store i32 %36, i32* %5
br label %6
37: ; preds = %6
ret void
}

LLVM IR (-O2):
define void @decrypt(i8* %0, i8* %1) {
%3 = tail call i32 @strlen(i8* %0)
%4 = icmp sgt i32 %3, 0
br i1 %4, label %5, label %21
5: ; preds = %2, %5
%6 = phi i64 [ %17, %5 ], [ 0, %2 ]
%7 = getelementptr inbounds i8, i8* %0, i64 %6
%8 = load i8, i8* %7
%9 = tail call i32 @strlen(i8* %1)
%10 = trunc i64 %6 to i32
%11 = srem i32 %10, %9
%12 = zext i32 %11 to i64
%13 = getelementptr inbounds i8, i8* %1, i64 %12
%14 = load i8, i8* %13
%15 = srem i8 %14, 26
%16 = add i8 %15, %8
store i8 %16, i8* %7
%17 = add nuw nsw i64 %6, 1
%18 = tail call i32 @strlen(i8* %0)
%19 = sext i32 %18 to i64
%20 = icmp slt i64 %17, %19
br i1 %20, label %5, label %21
21: ; preds = %5, %2
ret void
}