#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 strlen(char *);
void desencripta(char frase[]) {
  printf("frase Desencriptada:  ");
  int i = 0;
  for (i = 0; i < strlen(frase); i++) {
    int enc = (int)frase[i] - 3;
    if (enc < 97) {
      enc = enc + 26;
    }
    printf("%c", (char)enc);
  }
}


x86 assembly (clang, -O0):
<desencripta>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
lea    0xecd(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
movl   $0x0,-0xc(%rbp)
movl   $0x0,-0xc(%rbp)
mov    -0xc(%rbp),%eax
mov    %eax,-0x14(%rbp)
mov    -0x8(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,%ecx
mov    -0x14(%rbp),%eax
cmp    %ecx,%eax
jge    11ab <desencripta+0x8b>
mov    -0x8(%rbp),%rax
movslq -0xc(%rbp),%rcx
movsbl (%rax,%rcx,1),%eax
sub    $0x3,%eax
mov    %eax,-0x10(%rbp)
cmpl   $0x61,-0x10(%rbp)
jge    1189 <desencripta+0x69>
mov    -0x10(%rbp),%eax
add    $0x1a,%eax
mov    %eax,-0x10(%rbp)
mov    -0x10(%rbp),%eax
movsbl %al,%esi
lea    0xe81(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
mov    -0xc(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0xc(%rbp)
jmp    1148 <desencripta+0x28>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<desencripta>:
push   %r14
push   %rbx
push   %rax
mov    %rdi,%r14
lea    0xec2(%rip),%rdi
xor    %eax,%eax
call   1050 <printf@plt>
mov    %r14,%rdi
call   1040 <strlen@plt>
test   %eax,%eax
jle    1190 <desencripta+0x60>
xor    %ebx,%ebx
cs nopw 0x0(%rax,%rax,1)
nopl   (%rax)
movzbl (%r14,%rbx,1),%eax
lea    0xfd(%rax),%ecx
mov    %eax,%edx
add    $0x17,%edx
cmp    $0x64,%al
cmovge %ecx,%edx
movsbl %dl,%edi
call   1030 <putchar@plt>
add    $0x1,%rbx
mov    %r14,%rdi
call   1040 <strlen@plt>
cltq
cmp    %rax,%rbx
jl     1160 <desencripta+0x30>
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [23 x i8] c"frase Desencriptada: \00"
@.str.1 = [3 x i8] c"%c\00"
define void @desencripta(i8* %0) {
%2 = alloca i8*
%3 = alloca i32
%4 = alloca i32
store i8* %0, i8** %2
%5 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str, i64 0, i64 0))
store i32 0, i32* %3
store i32 0, i32* %3
br label %6
6: ; preds = %29, %1
%7 = load i32, i32* %3
%8 = load i8*, i8** %2
%9 = call i32 @strlen(i8* %8)
%10 = icmp slt i32 %7, %9
br i1 %10, label %11, label %32
11: ; preds = %6
%12 = load i8*, i8** %2
%13 = load i32, i32* %3
%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 = sub nsw i32 %17, 3
store i32 %18, i32* %4
%19 = load i32, i32* %4
%20 = icmp slt i32 %19, 97
br i1 %20, label %21, label %24
21: ; preds = %11
%22 = load i32, i32* %4
%23 = add nsw i32 %22, 26
store i32 %23, i32* %4
br label %24
24: ; preds = %21, %11
%25 = load i32, i32* %4
%26 = trunc i32 %25 to i8
%27 = sext i8 %26 to i32
%28 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32 %27)
br label %29
29: ; preds = %24
%30 = load i32, i32* %3
%31 = add nsw i32 %30, 1
store i32 %31, i32* %3
br label %6
32: ; preds = %6
ret void
}

LLVM IR (-O2):
@.str = [23 x i8] c"frase Desencriptada: \00"
define void @desencripta(i8* %0) {
%2 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([23 x i8], [23 x i8]* @.str, i64 0, i64 0))
%3 = tail call i32 @strlen(i8* %0)
%4 = icmp sgt i32 %3, 0
br i1 %4, label %5, label %20
5: ; preds = %1, %5
%6 = phi i64 [ %16, %5 ], [ 0, %1 ]
%7 = getelementptr inbounds i8, i8* %0, i64 %6
%8 = load i8, i8* %7
%9 = zext i8 %8 to i32
%10 = icmp slt i8 %8, 100
%11 = select i1 %10, i32 23, i32 253
%12 = add nuw nsw i32 %11, %9
%13 = shl i32 %12, 24
%14 = ashr exact i32 %13, 24
%15 = tail call i32 @putchar(i32 %14)
%16 = add nuw nsw i64 %6, 1
%17 = tail call i32 @strlen(i8* %0)
%18 = sext i32 %17 to i64
%19 = icmp slt i64 %16, %18
br i1 %19, label %5, label %20
20: ; preds = %5, %1
ret void
}