#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_memory(void *mem, size_t len) {
  int i;
  unsigned char *p = (unsigned char *)mem;
  for (i = 0; i < len; i++) {
    printf("%02x ", p[i]);
    if (i % 16 == 15)
      printf("\n");
  }
  printf("\n");
}


x86 assembly (clang, -O0):
<print_hex_memory>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    -0x8(%rbp),%rax
mov    %rax,-0x20(%rbp)
movl   $0x0,-0x14(%rbp)
movslq -0x14(%rbp),%rax
cmp    -0x10(%rbp),%rax
jae    118c <print_hex_memory+0x7c>
mov    -0x20(%rbp),%rax
movslq -0x14(%rbp),%rcx
movzbl (%rax,%rcx,1),%esi
lea    0xeb0(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x14(%rbp),%eax
mov    $0x10,%ecx
cltd
idiv   %ecx
cmp    $0xf,%edx
jne    1179 <print_hex_memory+0x69>
lea    0xe94(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
jmp    117e <print_hex_memory+0x6e>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    112f <print_hex_memory+0x1f>
lea    0xe73(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<print_hex_memory>:
push   %r15
push   %r14
push   %r12
push   %rbx
push   %rax
test   %rsi,%rsi
je     116c <print_hex_memory+0x4c>
mov    %rsi,%r12
mov    %rdi,%r14
lea    0xec6(%rip),%r15
xor    %ebx,%ebx
jmp    1149 <print_hex_memory+0x29>
xchg   %ax,%ax
add    $0x1,%rbx
cmp    %rbx,%r12
je     116c <print_hex_memory+0x4c>
movzbl (%r14,%rbx,1),%esi
mov    %r15,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %ebx,%eax
not    %eax
test   $0xf,%al
jne    1140 <print_hex_memory+0x20>
mov    $0xa,%edi
call   1030 <putchar@plt>
jmp    1140 <print_hex_memory+0x20>
mov    $0xa,%edi
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
jmp    1030 <putchar@plt>

LLVM IR (-O0):
@.str = [6 x i8] c"%02x \00"
@.str.1 = [2 x i8] c"\0A\00"
define void @print_hex_memory(i8* %0, i64 %1) {
%3 = alloca i8*
%4 = alloca i64
%5 = alloca i32
%6 = alloca i8*
store i8* %0, i8** %3
store i64 %1, i64* %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 = sext i32 %9 to i64
%11 = load i64, i64* %4
%12 = icmp ult i64 %10, %11
br i1 %12, label %13, label %30
13: ; preds = %8
%14 = load i8*, i8** %6
%15 = load i32, i32* %5
%16 = sext i32 %15 to i64
%17 = getelementptr inbounds i8, i8* %14, i64 %16
%18 = load i8, i8* %17
%19 = zext i8 %18 to i32
%20 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i32 %19)
%21 = load i32, i32* %5
%22 = srem i32 %21, 16
%23 = icmp eq i32 %22, 15
br i1 %23, label %24, label %26
24: ; preds = %13
%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, %13
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 = 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 = [6 x i8] c"%02x \00"
define void @print_hex_memory(i8* nocapture %0, i64 %1) {
%3 = icmp eq i64 %1, 0
br i1 %3, label %17, label %4
4: ; preds = %2, %14
%5 = phi i64 [ %15, %14 ], [ 0, %2 ]
%6 = getelementptr inbounds i8, i8* %0, i64 %5
%7 = load i8, i8* %6
%8 = zext i8 %7 to i32
%9 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i32 %8)
%10 = and i64 %5, 15
%11 = icmp eq i64 %10, 15
br i1 %11, label %12, label %14
12: ; preds = %4
%13 = tail call i32 @putchar(i32 10)
br label %14
14: ; preds = %4, %12
%15 = add nuw i64 %5, 1
%16 = icmp eq i64 %15, %1
br i1 %16, label %17, label %4
17: ; preds = %14, %2
%18 = tail call i32 @putchar(i32 10)
ret void
}