#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 /*<<< orphan*/ putchar(char);
void hexdump(const void *data, int len) {
  int i;
  const unsigned char *bytes = data;
  for (i = 0; i < len; i++) {
    printf("%02X ", bytes[i]);
    if ((i + 1) % 16 == 0)
      printf("\n");
  }
  if (len % 16)
    putchar('\n');
}


x86 assembly (clang, -O0):
<hexdump>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %esi,-0xc(%rbp)
mov    -0x8(%rbp),%rax
mov    %rax,-0x18(%rbp)
movl   $0x0,-0x10(%rbp)
mov    -0x10(%rbp),%eax
cmp    -0xc(%rbp),%eax
jge    119c <hexdump+0x7c>
mov    -0x18(%rbp),%rax
movslq -0x10(%rbp),%rcx
movzbl (%rax,%rcx,1),%esi
lea    0xea3(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
mov    -0x10(%rbp),%eax
add    $0x1,%eax
mov    $0x10,%ecx
cltd
idiv   %ecx
cmp    $0x0,%edx
jne    1189 <hexdump+0x69>
lea    0xe84(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
jmp    118e <hexdump+0x6e>
mov    -0x10(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x10(%rbp)
jmp    113e <hexdump+0x1e>
mov    -0xc(%rbp),%eax
mov    $0x10,%ecx
cltd
idiv   %ecx
cmp    $0x0,%edx
je     11ba <hexdump+0x9a>
mov    $0xa,%edi
call   1030 <putchar@plt>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<hexdump>:
push   %rbp
push   %r15
push   %r14
push   %r12
push   %rbx
mov    %esi,%r14d
test   %esi,%esi
jle    1183 <hexdump+0x63>
mov    %rdi,%r12
mov    %r14d,%ebp
neg    %rbp
mov    $0x1,%ebx
lea    0xebc(%rip),%r15
jmp    1162 <hexdump+0x42>
cs nopw 0x0(%rax,%rax,1)
lea    (%rbx,%rbp,1),%rax
add    $0x1,%rax
add    $0x1,%rbx
cmp    $0x1,%rax
je     1183 <hexdump+0x63>
movzbl -0x1(%r12,%rbx,1),%esi
mov    %r15,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
test   $0xf,%bl
jne    1150 <hexdump+0x30>
mov    $0xa,%edi
call   1030 <putchar@plt>
jmp    1150 <hexdump+0x30>
test   $0xf,%r14b
je     119b <hexdump+0x7b>
mov    $0xa,%edi
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
pop    %rbp
jmp    1030 <putchar@plt>
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@.str = [6 x i8] c"%02X \00"
@.str.1 = [2 x i8] c"\0A\00"
define void @hexdump(i8* %0, i32 %1) {
%3 = alloca i8*
%4 = alloca i32
%5 = alloca i32
%6 = alloca i8*
store i8* %0, i8** %3
store i32 %1, i32* %4
%7 = load i8*, i8** %3
store i8* %7, i8** %6
store i32 0, i32* %5
br label %8
8: ; preds = %27, %2
%9 = load i32, i32* %5
%10 = load i32, i32* %4
%11 = icmp slt i32 %9, %10
br i1 %11, label %12, label %30
12: ; preds = %8
%13 = load i8*, i8** %6
%14 = load i32, i32* %5
%15 = sext i32 %14 to i64
%16 = getelementptr inbounds i8, i8* %13, i64 %15
%17 = load i8, i8* %16
%18 = zext i8 %17 to i32
%19 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i32 %18)
%20 = load i32, i32* %5
%21 = add nsw i32 %20, 1
%22 = srem i32 %21, 16
%23 = icmp eq i32 %22, 0
br i1 %23, label %24, label %26
24: ; preds = %12
%25 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
br label %26
26: ; preds = %24, %12
br label %27
27: ; preds = %26
%28 = load i32, i32* %5
%29 = add nsw i32 %28, 1
store i32 %29, i32* %5
br label %8
30: ; preds = %8
%31 = load i32, i32* %4
%32 = srem i32 %31, 16
%33 = icmp ne i32 %32, 0
br i1 %33, label %34, label %36
34: ; preds = %30
%35 = call i32 @putchar(i8 signext 10)
br label %36
36: ; preds = %34, %30
ret void
}

LLVM IR (-O2):
@.str = [6 x i8] c"%02X \00"
define void @hexdump(i8* nocapture %0, i32 %1) {
%3 = icmp sgt i32 %1, 0
br i1 %3, label %4, label %19
4: ; preds = %2
%5 = zext i32 %1 to i64
br label %6
6: ; preds = %4, %17
%7 = phi i64 [ 0, %4 ], [ %12, %17 ]
%8 = getelementptr inbounds i8, i8* %0, i64 %7
%9 = load i8, i8* %8
%10 = zext i8 %9 to i32
%11 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i32 %10)
%12 = add nuw nsw i64 %7, 1
%13 = and i64 %12, 15
%14 = icmp eq i64 %13, 0
br i1 %14, label %15, label %17
15: ; preds = %6
%16 = tail call i32 bitcast (i32 (i8)* @putchar to i32 (i32)*)(i32 10)
br label %17
17: ; preds = %6, %15
%18 = icmp eq i64 %12, %5
br i1 %18, label %19, label %6
19: ; preds = %17, %2
%20 = and i32 %1, 15
%21 = icmp eq i32 %20, 0
br i1 %21, label %24, label %22
22: ; preds = %19
%23 = tail call i32 @putchar(i8 signext 10)
br label %24
24: ; preds = %22, %19
ret void
}