#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 */
typedef int uint8_t;
typedef scalar_t__ time_t;

/* Variables and functions */
int /*<<< orphan*/ sprintf(char *, char *, int);
int time(int /*<<< orphan*/ *);
scalar_t__ vito_read(int, int, int *);
const char *const read_deviceid(void) {
  static char cache[10];
  static time_t old_time = 0;
  uint8_t vitomem[30];
  time_t new_time = time(NULL) / (6);
  if (new_time > old_time) {
    if (vito_read(0x00f8, 2, vitomem) < 0)
      return "NULL";
    sprintf(cache, "0x%4x", (vitomem[0] << 8) + vitomem[1]);
    old_time = new_time;
  }
  return cache;
}


x86 assembly (clang, -O0):
<read_deviceid>:
push   %rbp
mov    %rsp,%rbp
sub    $0x90,%rsp
xor    %eax,%eax
mov    %eax,%edi
call   1040 <time@plt>
mov    $0x6,%ecx
cltd
idiv   %ecx
cltq
mov    %rax,-0x88(%rbp)
mov    -0x88(%rbp),%rax
cmp    0x2eed(%rip),%rax
jle    11c0 <read_deviceid+0x90>
lea    -0x80(%rbp),%rdx
mov    $0xf8,%edi
mov    $0x2,%esi
call   1030 <vito_read@plt>
cmp    $0x0,%rax
jge    1196 <read_deviceid+0x66>
lea    0xe73(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11cb <read_deviceid+0x9b>
mov    -0x80(%rbp),%edx
shl    $0x8,%edx
add    -0x7c(%rbp),%edx
lea    0x2e9a(%rip),%rdi
lea    0xe58(%rip),%rsi
call   1050 <sprintf@plt>
mov    -0x88(%rbp),%rax
mov    %rax,0x2e90(%rip)
lea    0x2e79(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
add    $0x90,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<read_deviceid>:
push   %r14
push   %rbx
sub    $0x78,%rsp
xor    %edi,%edi
call   1040 <time@plt>
cltq
imul   $0x2aaaaaab,%rax,%rax
mov    %rax,%rcx
shr    $0x3f,%rcx
shr    $0x20,%rax
add    %ecx,%eax
movslq %eax,%r14
cmp    %r14,0x2ef2(%rip)
jge    11a0 <read_deviceid+0x70>
mov    %rsp,%rdx
mov    $0xf8,%edi
mov    $0x2,%esi
call   1030 <vito_read@plt>
test   %rax,%rax
js     11a9 <read_deviceid+0x79>
mov    (%rsp),%edx
shl    $0x8,%edx
add    0x4(%rsp),%edx
lea    0x2eb8(%rip),%rbx
lea    0xe76(%rip),%rsi
mov    %rbx,%rdi
call   1050 <sprintf@plt>
mov    %r14,0x2eb2(%rip)
jmp    11b0 <read_deviceid+0x80>
lea    0x2e99(%rip),%rbx
jmp    11b0 <read_deviceid+0x80>
lea    0xe50(%rip),%rbx
mov    %rbx,%rax
add    $0x78,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@read_deviceid.cache = internal global [10 x i8] zeroinitializer
@read_deviceid.old_time = internal global i64 0
@.str = [5 x i8] c"NULL\00"
@.str.1 = [6 x i8] c"0x%4x\00"
define i8* @read_deviceid() {
%1 = alloca i8*
%2 = alloca [30 x i32]
%3 = alloca i64
%4 = call i32 @time(i32* null)
%5 = sdiv i32 %4, 6
%6 = sext i32 %5 to i64
store i64 %6, i64* %3
%7 = load i64, i64* %3
%8 = load i64, i64* @read_deviceid.old_time
%9 = icmp sgt i64 %7, %8
br i1 %9, label %10, label %24
10: ; preds = %0
%11 = getelementptr inbounds [30 x i32], [30 x i32]* %2, i64 0, i64 0
%12 = call i64 @vito_read(i32 248, i32 2, i32* %11)
%13 = icmp slt i64 %12, 0
br i1 %13, label %14, label %15
14: ; preds = %10
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8** %1
br label %25
15: ; preds = %10
%16 = getelementptr inbounds [30 x i32], [30 x i32]* %2, i64 0, i64 0
%17 = load i32, i32* %16
%18 = shl i32 %17, 8
%19 = getelementptr inbounds [30 x i32], [30 x i32]* %2, i64 0, i64 1
%20 = load i32, i32* %19
%21 = add nsw i32 %18, %20
%22 = call i32 @sprintf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @read_deviceid.cache, i64 0, i64 0), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i32 %21)
%23 = load i64, i64* %3
store i64 %23, i64* @read_deviceid.old_time
br label %24
24: ; preds = %15, %0
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @read_deviceid.cache, i64 0, i64 0), i8** %1
br label %25
25: ; preds = %24, %14
%26 = load i8*, i8** %1
ret i8* %26
}

LLVM IR (-O2):
@read_deviceid.cache = internal global [10 x i8] zeroinitializer
@read_deviceid.old_time = internal unnamed_addr global i64 0
@.str = [5 x i8] c"NULL\00"
@.str.1 = [6 x i8] c"0x%4x\00"
define i8* @read_deviceid() {
%1 = alloca [30 x i32]
%2 = bitcast [30 x i32]* %1 to i8*
%3 = tail call i32 @time(i32* null)
%4 = sdiv i32 %3, 6
%5 = sext i32 %4 to i64
%6 = load i64, i64* @read_deviceid.old_time
%7 = icmp slt i64 %6, %5
br i1 %7, label %8, label %19
8: ; preds = %0
%9 = getelementptr inbounds [30 x i32], [30 x i32]* %1, i64 0, i64 0
%10 = call i64 @vito_read(i32 248, i32 2, i32* %9)
%11 = icmp slt i64 %10, 0
br i1 %11, label %19, label %12
12: ; preds = %8
%13 = load i32, i32* %9
%14 = shl i32 %13, 8
%15 = getelementptr inbounds [30 x i32], [30 x i32]* %1, i64 0, i64 1
%16 = load i32, i32* %15
%17 = add nsw i32 %14, %16
%18 = call i32 @sprintf(i8* dereferenceable(1) getelementptr inbounds ([10 x i8], [10 x i8]* @read_deviceid.cache, i64 0, i64 0), i8* dereferenceable(1) getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i32 %17)
store i64 %5, i64* @read_deviceid.old_time
br label %19
19: ; preds = %0, %12, %8
%20 = phi i8* [ getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), %8 ], [ getelementptr inbounds ([10 x i8], [10 x i8]* @read_deviceid.cache, i64 0, i64 0), %12 ], [ getelementptr inbounds ([10 x i8], [10 x i8]* @read_deviceid.cache, i64 0, i64 0), %0 ]
ret i8* %20
}