#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 *, ...);
void hexprint(const char *descr, const unsigned char *bytes,
              unsigned int nbytes) {
  if (descr)
    printf("%s = ", descr);
  unsigned int i;
  for (i = 0; i < nbytes; i++) {
    printf("%02x", bytes[i]);
  }
  printf("\n");
}


x86 assembly (clang, -O0):
<hexprint>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    %edx,-0x14(%rbp)
cmpq   $0x0,-0x8(%rbp)
je     1140 <hexprint+0x30>
mov    -0x8(%rbp),%rsi
lea    0xec7(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x0,-0x18(%rbp)
mov    -0x18(%rbp),%eax
cmp    -0x14(%rbp),%eax
jae    117a <hexprint+0x6a>
mov    -0x10(%rbp),%rax
mov    -0x18(%rbp),%ecx
movzbl (%rax,%rcx,1),%esi
lea    0xea1(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x18(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x18(%rbp)
jmp    1147 <hexprint+0x37>
lea    0xe8a(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<hexprint>:
push   %rbp
push   %r15
push   %r14
push   %rbx
push   %rax
mov    %edx,%ebp
mov    %rsi,%r15
test   %rdi,%rdi
je     1142 <hexprint+0x22>
mov    %rdi,%rsi
lea    0xec5(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
test   %ebp,%ebp
je     1178 <hexprint+0x58>
mov    %ebp,%ebp
lea    0xeb7(%rip),%r14
xor    %ebx,%ebx
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax,%rax,1)
movzbl (%r15,%rbx,1),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
add    $0x1,%rbx
cmp    %rbx,%rbp
jne    1160 <hexprint+0x40>
mov    $0xa,%edi
add    $0x8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
jmp    1030 <putchar@plt>

LLVM IR (-O0):
@.str = [6 x i8] c"%s = \00"
@.str.1 = [5 x i8] c"%02x\00"
@.str.2 = [2 x i8] c"\0A\00"
define void @hexprint(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
%8 = load i8*, i8** %4
%9 = icmp ne i8* %8, null
br i1 %9, label %10, label %13
10: ; preds = %3
%11 = load i8*, i8** %4
%12 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i8* %11)
br label %13
13: ; preds = %10, %3
store i32 0, i32* %7
br label %14
14: ; preds = %26, %13
%15 = load i32, i32* %7
%16 = load i32, i32* %6
%17 = icmp ult i32 %15, %16
br i1 %17, label %18, label %29
18: ; preds = %14
%19 = load i8*, i8** %5
%20 = load i32, i32* %7
%21 = zext i32 %20 to i64
%22 = getelementptr inbounds i8, i8* %19, i64 %21
%23 = load i8, i8* %22
%24 = zext i8 %23 to i32
%25 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0), i32 %24)
br label %26
26: ; preds = %18
%27 = load i32, i32* %7
%28 = add i32 %27, 1
store i32 %28, i32* %7
br label %14
29: ; preds = %14
%30 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0))
ret void
}

LLVM IR (-O2):
@.str = [6 x i8] c"%s = \00"
@.str.1 = [5 x i8] c"%02x\00"
define void @hexprint(i8* %0, i8* nocapture %1, i32 %2) {
%4 = icmp eq i8* %0, null
br i1 %4, label %7, label %5
5: ; preds = %3
%6 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i8* %0)
br label %7
7: ; preds = %5, %3
%8 = icmp eq i32 %2, 0
br i1 %8, label %19, label %9
9: ; preds = %7
%10 = zext i32 %2 to i64
br label %11
11: ; preds = %9, %11
%12 = phi i64 [ 0, %9 ], [ %17, %11 ]
%13 = getelementptr inbounds i8, i8* %1, i64 %12
%14 = load i8, i8* %13
%15 = zext i8 %14 to i32
%16 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0), i32 %15)
%17 = add nuw nsw i64 %12, 1
%18 = icmp eq i64 %17, %10
br i1 %18, label %19, label %11
19: ; preds = %11, %7
%20 = tail call i32 @putchar(i32 10)
ret void
}