#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 print_hex(unsigned char *data, int len) {
  int i;
  for (i = 0; i < len; i++) {
    if ((i != 0) && (i % 8 == 0))
      printf(" ");
    if ((i != 0) && (i % 16 == 0))
      printf("\n");
    printf("%02x ", (int)data[i]);
  }
  printf("\n");
}


x86 assembly (clang, -O0):
<print_hex>:
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    11b2 <print_hex+0xa2>
cmpl   $0x0,-0x10(%rbp)
je     115e <print_hex+0x4e>
mov    -0x10(%rbp),%eax
mov    $0x8,%ecx
cltd
idiv   %ecx
cmp    $0x0,%edx
jne    115e <print_hex+0x4e>
lea    0xeaf(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
cmpl   $0x0,-0x10(%rbp)
je     118a <print_hex+0x7a>
mov    -0x10(%rbp),%eax
mov    $0x10,%ecx
cltd
idiv   %ecx
cmp    $0x0,%edx
jne    118a <print_hex+0x7a>
lea    0xe7d(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x8(%rbp),%rax
movslq -0x10(%rbp),%rcx
movzbl (%rax,%rcx,1),%esi
lea    0xe65(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x10(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x10(%rbp)
jmp    1126 <print_hex+0x16>
lea    0xe47(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<print_hex>:
push   %r15
push   %r14
push   %r12
push   %rbx
push   %rax
test   %esi,%esi
jle    1186 <print_hex+0x66>
mov    %rdi,%r15
mov    %esi,%r12d
lea    0xec7(%rip),%r14
xor    %ebx,%ebx
jmp    1158 <print_hex+0x38>
nopl   (%rax)
movzbl (%r15,%rbx,1),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
add    $0x1,%rbx
cmp    %rbx,%r12
je     1186 <print_hex+0x66>
test   %rbx,%rbx
je     116e <print_hex+0x4e>
mov    %ebx,%eax
and    $0x7,%eax
jne    116e <print_hex+0x4e>
mov    $0x20,%edi
call   1030 <putchar@plt>
test   %rbx,%rbx
je     1140 <print_hex+0x20>
mov    %ebx,%eax
and    $0xf,%eax
jne    1140 <print_hex+0x20>
mov    $0xa,%edi
call   1030 <putchar@plt>
jmp    1140 <print_hex+0x20>
mov    $0xa,%edi
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
jmp    1030 <putchar@plt>

LLVM IR (-O0):
@.str = [2 x i8] c" \00"
@.str.1 = [2 x i8] c"\0A\00"
@.str.2 = [6 x i8] c"%02x \00"
define void @print_hex(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 = %36, %2
%7 = load i32, i32* %5
%8 = load i32, i32* %4
%9 = icmp slt i32 %7, %8
br i1 %9, label %10, label %39
10: ; preds = %6
%11 = load i32, i32* %5
%12 = icmp ne i32 %11, 0
br i1 %12, label %13, label %19
13: ; preds = %10
%14 = load i32, i32* %5
%15 = srem i32 %14, 8
%16 = icmp eq i32 %15, 0
br i1 %16, label %17, label %19
17: ; preds = %13
%18 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
br label %19
19: ; preds = %17, %13, %10
%20 = load i32, i32* %5
%21 = icmp ne i32 %20, 0
br i1 %21, label %22, label %28
22: ; preds = %19
%23 = load i32, i32* %5
%24 = srem i32 %23, 16
%25 = icmp eq i32 %24, 0
br i1 %25, label %26, label %28
26: ; preds = %22
%27 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
br label %28
28: ; preds = %26, %22, %19
%29 = load i8*, i8** %3
%30 = load i32, i32* %5
%31 = sext i32 %30 to i64
%32 = getelementptr inbounds i8, i8* %29, i64 %31
%33 = load i8, i8* %32
%34 = zext i8 %33 to i32
%35 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.2, i64 0, i64 0), i32 %34)
br label %36
36: ; preds = %28
%37 = load i32, i32* %5
%38 = add nsw i32 %37, 1
store i32 %38, i32* %5
br label %6
39: ; preds = %6
%40 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
ret void
}

LLVM IR (-O2):
@.str.2 = [6 x i8] c"%02x \00"
define void @print_hex(i8* nocapture %0, i32 %1) {
%3 = icmp sgt i32 %1, 0
br i1 %3, label %4, label %28
4: ; preds = %2
%5 = zext i32 %1 to i64
br label %6
6: ; preds = %4, %21
%7 = phi i64 [ 0, %4 ], [ %26, %21 ]
%8 = icmp ne i64 %7, 0
%9 = trunc i64 %7 to i32
%10 = and i32 %9, 7
%11 = icmp eq i32 %10, 0
%12 = and i1 %8, %11
br i1 %12, label %13, label %15
13: ; preds = %6
%14 = tail call i32 @putchar(i32 32)
br label %15
15: ; preds = %13, %6
%16 = and i32 %9, 15
%17 = icmp eq i32 %16, 0
%18 = and i1 %8, %17
br i1 %18, label %19, label %21
19: ; preds = %15
%20 = tail call i32 @putchar(i32 10)
br label %21
21: ; preds = %19, %15
%22 = getelementptr inbounds i8, i8* %0, i64 %7
%23 = load i8, i8* %22
%24 = zext i8 %23 to i32
%25 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([6 x i8], [6 x i8]* @.str.2, i64 0, i64 0), i32 %24)
%26 = add nuw nsw i64 %7, 1
%27 = icmp eq i64 %26, %5
br i1 %27, label %28, label %6
28: ; preds = %21, %2
%29 = tail call i32 @putchar(i32 10)
ret void
}