#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 */
char shift_char(char, int);
int strlen(char *);
void caesar(char *dst, char *src, int shift) {
  int i;
  for (i = 0; i < strlen(src); i++) {
    dst[i] = shift_char(src[i], shift);
  }
  dst[i] = '\0';
}


x86 assembly (clang, -O0):
<caesar>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    %edx,-0x14(%rbp)
movl   $0x0,-0x18(%rbp)
mov    -0x18(%rbp),%eax
mov    %eax,-0x1c(%rbp)
mov    -0x10(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,%ecx
mov    -0x1c(%rbp),%eax
cmp    %ecx,%eax
jge    1187 <caesar+0x67>
mov    -0x10(%rbp),%rax
movslq -0x18(%rbp),%rcx
mov    (%rax,%rcx,1),%al
mov    -0x14(%rbp),%esi
movsbl %al,%edi
call   1040 <shift_char@plt>
mov    %al,%dl
mov    -0x8(%rbp),%rax
movslq -0x18(%rbp),%rcx
mov    %dl,(%rax,%rcx,1)
mov    -0x18(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x18(%rbp)
jmp    113a <caesar+0x1a>
mov    -0x8(%rbp),%rax
movslq -0x18(%rbp),%rcx
movb   $0x0,(%rax,%rcx,1)
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<caesar>:
push   %rbp
push   %r15
push   %r14
push   %rbx
push   %rax
mov    %edx,%r15d
mov    %rsi,%rbx
mov    %rdi,%r14
mov    %rsi,%rdi
call   1030 <strlen@plt>
xor    %ebp,%ebp
test   %eax,%eax
jle    1163 <caesar+0x43>
xchg   %ax,%ax
movsbl (%rbx,%rbp,1),%edi
mov    %r15d,%esi
call   1040 <shift_char@plt>
mov    %al,(%r14,%rbp,1)
add    $0x1,%rbp
mov    %rbx,%rdi
call   1030 <strlen@plt>
cltq
cmp    %rax,%rbp
jl     1140 <caesar+0x20>
movb   $0x0,(%r14,%rbp,1)
add    $0x8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret

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

LLVM IR (-O2):
define void @caesar(i8* nocapture writeonly %0, i8* %1, i32 %2) {
%4 = tail call i32 @strlen(i8* %1)
%5 = icmp sgt i32 %4, 0
br i1 %5, label %6, label %18
6: ; preds = %3, %6
%7 = phi i64 [ %12, %6 ], [ 0, %3 ]
%8 = getelementptr inbounds i8, i8* %1, i64 %7
%9 = load i8, i8* %8
%10 = tail call signext i8 @shift_char(i8 signext %9, i32 %2)
%11 = getelementptr inbounds i8, i8* %0, i64 %7
store i8 %10, i8* %11
%12 = add nuw nsw i64 %7, 1
%13 = tail call i32 @strlen(i8* %1)
%14 = sext i32 %13 to i64
%15 = icmp slt i64 %12, %14
br i1 %15, label %6, label %16
16: ; preds = %6
%17 = and i64 %12, 4294967295
br label %18
18: ; preds = %16, %3
%19 = phi i64 [ 0, %3 ], [ %17, %16 ]
%20 = getelementptr inbounds i8, i8* %0, i64 %19
store i8 0, i8* %20
ret void
}