#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 dec(unsigned char *, unsigned char const *, unsigned char const *,
        unsigned char const *, unsigned long long, unsigned char const *,
        unsigned long long);
int crypto_aead_decrypt(unsigned char *m, unsigned long long *mlen,
                        unsigned char *nsec, const unsigned char *c,
                        unsigned long long clen, const unsigned char *ad,
                        unsigned long long adlen, const unsigned char *npub,
                        const unsigned char *k) {
  int res = dec(m, k, npub, ad, adlen, c, clen);
  *mlen = clen - (long long)(const int)32 / 8;
  return res;
}


x86 assembly (clang, -O0):
<crypto_aead_decrypt>:
push   %rbp
mov    %rsp,%rbp
sub    $0x40,%rsp
mov    0x20(%rbp),%rax
mov    0x18(%rbp),%rax
mov    0x10(%rbp),%rax
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    %rdx,-0x18(%rbp)
mov    %rcx,-0x20(%rbp)
mov    %r8,-0x28(%rbp)
mov    %r9,-0x30(%rbp)
mov    -0x8(%rbp),%rdi
mov    0x20(%rbp),%rsi
mov    0x18(%rbp),%rdx
mov    -0x30(%rbp),%rcx
mov    0x10(%rbp),%r8
mov    -0x20(%rbp),%r9
mov    -0x28(%rbp),%rax
mov    %rax,(%rsp)
call   1030 <dec@plt>
mov    %eax,-0x34(%rbp)
mov    -0x28(%rbp),%rcx
sub    $0x4,%rcx
mov    -0x10(%rbp),%rax
mov    %rcx,(%rax)
mov    -0x34(%rbp),%eax
add    $0x40,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<crypto_aead_decrypt>:
push   %r14
push   %rbx
push   %rax
mov    %r8,%rbx
mov    %rcx,%rax
mov    %rsi,%r14
mov    0x30(%rsp),%rsi
mov    0x28(%rsp),%rdx
mov    0x20(%rsp),%r8
mov    %rbx,(%rsp)
mov    %r9,%rcx
mov    %rax,%r9
call   1030 <dec@plt>
add    $0xfffffffffffffffc,%rbx
mov    %rbx,(%r14)
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
define i32 @crypto_aead_decrypt(i8* %0, i64* %1, i8* %2, i8* %3, i64 %4, i8* %5, i64 %6, i8* %7, i8* %8) {
%10 = alloca i8*
%11 = alloca i64*
%12 = alloca i8*
%13 = alloca i8*
%14 = alloca i64
%15 = alloca i8*
%16 = alloca i64
%17 = alloca i8*
%18 = alloca i8*
%19 = alloca i32
store i8* %0, i8** %10
store i64* %1, i64** %11
store i8* %2, i8** %12
store i8* %3, i8** %13
store i64 %4, i64* %14
store i8* %5, i8** %15
store i64 %6, i64* %16
store i8* %7, i8** %17
store i8* %8, i8** %18
%20 = load i8*, i8** %10
%21 = load i8*, i8** %18
%22 = load i8*, i8** %17
%23 = load i8*, i8** %15
%24 = load i64, i64* %16
%25 = load i8*, i8** %13
%26 = load i64, i64* %14
%27 = call i32 @dec(i8* %20, i8* %21, i8* %22, i8* %23, i64 %24, i8* %25, i64 %26)
store i32 %27, i32* %19
%28 = load i64, i64* %14
%29 = sub i64 %28, 4
%30 = load i64*, i64** %11
store i64 %29, i64* %30
%31 = load i32, i32* %19
ret i32 %31
}

LLVM IR (-O2):
define i32 @crypto_aead_decrypt(i8* %0, i64* nocapture writeonly %1, i8* nocapture readnone %2, i8* %3, i64 %4, i8* %5, i64 %6, i8* %7, i8* %8) {
%10 = tail call i32 @dec(i8* %0, i8* %8, i8* %7, i8* %5, i64 %6, i8* %3, i64 %4)
%11 = add i64 %4, -4
store i64 %11, i64* %1
ret i32 %10
}