#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 hex_dump(unsigned char *data, int length) {
  int i;
  for (i = 0; i < length; i++) {
    printf("%2.2X", data[i]);
    if ((i & 0x0F) == 0x0F)
      printf("\n");
    else
      printf(":");
  }
  if ((length & 0x0F) != 0)
    printf("\n");
}


x86 assembly (clang, -O0):
<hex_dump>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x8(%rbp)
mov    %esi,-0xc(%rbp)
movl   $0x0,-0x10(%rbp)
mov    -0x10(%rbp),%eax
cmp    -0xc(%rbp),%eax
jge    118f <hex_dump+0x7f>
mov    -0x8(%rbp),%rax
movslq -0x10(%rbp),%rcx
movzbl (%rax,%rcx,1),%esi
lea    0xebb(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x10(%rbp),%eax
and    $0xf,%eax
cmp    $0xf,%eax
jne    116e <hex_dump+0x5e>
lea    0xea4(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
jmp    117c <hex_dump+0x6c>
lea    0xe93(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
jmp    1181 <hex_dump+0x71>
mov    -0x10(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x10(%rbp)
jmp    1126 <hex_dump+0x16>
mov    -0xc(%rbp),%eax
and    $0xf,%eax
cmp    $0x0,%eax
je     11ac <hex_dump+0x9c>
lea    0xe61(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<hex_dump>:
push   %rbp
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
push   %rax
mov    %esi,%r14d
test   %esi,%esi
jle    117d <hex_dump+0x5d>
mov    %rdi,%r13
mov    %r14d,%ebp
lea    0xec1(%rip),%r15
mov    $0xa,%r12d
xor    %ebx,%ebx
nopw   0x0(%rax,%rax,1)
movzbl 0x0(%r13,%rbx,1),%esi
mov    %r15,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %ebx,%eax
not    %eax
test   $0xf,%al
mov    $0x3a,%edi
cmove  %r12d,%edi
call   1030 <putchar@plt>
add    $0x1,%rbx
cmp    %rbx,%rbp
jne    1150 <hex_dump+0x30>
test   $0xf,%r14b
je     119b <hex_dump+0x7b>
mov    $0xa,%edi
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
pop    %rbp
jmp    1030 <putchar@plt>
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@.str = [6 x i8] c"%2.2X\00"
@.str.1 = [2 x i8] c"\0A\00"
@.str.2 = [2 x i8] c":\00"
define void @hex_dump(i8* %0, i32 %1) {
%3 = alloca i8*
%4 = alloca i32
%5 = alloca i32
store i8* %0, i8** %3
store i32 %1, i32* %4
store i32 0, i32* %5
br label %6
6: ; preds = %26, %2
%7 = load i32, i32* %5
%8 = load i32, i32* %4
%9 = icmp slt i32 %7, %8
br i1 %9, label %10, label %29
10: ; preds = %6
%11 = load i8*, i8** %3
%12 = load i32, i32* %5
%13 = sext i32 %12 to i64
%14 = getelementptr inbounds i8, i8* %11, i64 %13
%15 = load i8, i8* %14
%16 = zext i8 %15 to i32
%17 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i32 %16)
%18 = load i32, i32* %5
%19 = and i32 %18, 15
%20 = icmp eq i32 %19, 15
br i1 %20, label %21, label %23
21: ; preds = %10
%22 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
br label %25
23: ; preds = %10
%24 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0))
br label %25
25: ; preds = %23, %21
br label %26
26: ; preds = %25
%27 = load i32, i32* %5
%28 = add nsw i32 %27, 1
store i32 %28, i32* %5
br label %6
29: ; preds = %6
%30 = load i32, i32* %4
%31 = and i32 %30, 15
%32 = icmp ne i32 %31, 0
br i1 %32, label %33, label %35
33: ; preds = %29
%34 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
br label %35
35: ; preds = %33, %29
ret void
}

LLVM IR (-O2):
@.str = [6 x i8] c"%2.2X\00"
define void @hex_dump(i8* nocapture %0, i32 %1) {
%3 = icmp sgt i32 %1, 0
br i1 %3, label %4, label %18
4: ; preds = %2
%5 = zext i32 %1 to i64
br label %6
6: ; preds = %4, %6
%7 = phi i64 [ 0, %4 ], [ %16, %6 ]
%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 = and i64 %7, 15
%13 = icmp eq i64 %12, 15
%14 = select i1 %13, i32 10, i32 58
%15 = tail call i32 @putchar(i32 %14)
%16 = add nuw nsw i64 %7, 1
%17 = icmp eq i64 %16, %5
br i1 %17, label %18, label %6
18: ; preds = %6, %2
%19 = and i32 %1, 15
%20 = icmp eq i32 %19, 0
br i1 %20, label %23, label %21
21: ; preds = %18
%22 = tail call i32 @putchar(i32 10)
br label %23
23: ; preds = %21, %18
ret void
}