#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 *, char const, char);
void hexdump(void *ptr, int size) {
  int i;
  const char *c = (char *)ptr;
  for (i = 0; i < size; i++) {
    printf("%02X%c", c[i], (i + 1) % 8 == 0 ? '\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    1185 <hexdump+0x75>
mov    -0x18(%rbp),%rax
movslq -0x10(%rbp),%rcx
mov    (%rax,%rcx,1),%cl
mov    -0x10(%rbp),%eax
add    $0x1,%eax
mov    $0x8,%esi
cltd
idiv   %esi
mov    %edx,%esi
mov    $0x20,%eax
mov    $0xa,%edx
cmp    $0x0,%esi
cmove  %edx,%eax
lea    0xe94(%rip),%rdi
movsbl %cl,%esi
movsbl %al,%edx
call   1030 <printf@plt>
mov    -0x10(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x10(%rbp)
jmp    112e <hexdump+0x1e>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<hexdump>:
push   %rbp
push   %r15
push   %r14
push   %r12
push   %rbx
test   %esi,%esi
jle    116b <hexdump+0x5b>
mov    %rdi,%r15
mov    %esi,%r12d
neg    %r12
mov    $0x1,%ebx
mov    $0xa,%ebp
lea    0xeca(%rip),%r14
cs nopw 0x0(%rax,%rax,1)
movsbl -0x1(%r15,%rbx,1),%esi
test   $0x7,%bl
mov    $0x20,%edx
cmove  %ebp,%edx
mov    %r14,%rdi
call   1030 <printf@plt>
lea    (%r12,%rbx,1),%rax
add    $0x1,%rax
add    $0x1,%rbx
cmp    $0x1,%rax
jne    1140 <hexdump+0x30>
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@.str = [7 x i8] c"%02X%c\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 = %26, %2
%9 = load i32, i32* %5
%10 = load i32, i32* %4
%11 = icmp slt i32 %9, %10
br i1 %11, label %12, label %29
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 = load i32, i32* %5
%19 = add nsw i32 %18, 1
%20 = srem i32 %19, 8
%21 = icmp eq i32 %20, 0
%22 = zext i1 %21 to i64
%23 = select i1 %21, i32 10, i32 32
%24 = trunc i32 %23 to i8
%25 = call i32 @printf(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0), i8 signext %17, i8 signext %24)
br label %26
26: ; preds = %12
%27 = load i32, i32* %5
%28 = add nsw i32 %27, 1
store i32 %28, i32* %5
br label %8
29: ; preds = %8
ret void
}

LLVM IR (-O2):
@.str = [7 x i8] c"%02X%c\00"
define void @hexdump(i8* nocapture %0, i32 %1) {
%3 = icmp sgt i32 %1, 0
br i1 %3, label %4, label %16
4: ; preds = %2
%5 = zext i32 %1 to i64
br label %6
6: ; preds = %4, %6
%7 = phi i64 [ 0, %4 ], [ %10, %6 ]
%8 = getelementptr inbounds i8, i8* %0, i64 %7
%9 = load i8, i8* %8
%10 = add nuw nsw i64 %7, 1
%11 = and i64 %10, 7
%12 = icmp eq i64 %11, 0
%13 = select i1 %12, i8 10, i8 32
%14 = tail call i32 @printf(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0), i8 signext %9, i8 signext %13)
%15 = icmp eq i64 %10, %5
br i1 %15, label %16, label %6
16: ; preds = %6, %2
ret void
}