#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 hexdump(const void *buf, int len) {
  static const char hex[] = "0123456789abcdef";
  int i;
  for (i = 0; i < len; i++)
    printf("%c%c ", hex[(((char *)buf)[i] >> 4) & 15],
           hex[((char *)buf)[i] & 15]);
  printf("\n");
}


x86 assembly (clang, -O0):
<hexdump>:
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    118b <hexdump+0x7b>
mov    -0x8(%rbp),%rax
movslq -0x10(%rbp),%rcx
movsbl (%rax,%rcx,1),%eax
sar    $0x4,%eax
and    $0xf,%eax
movslq %eax,%rcx
lea    0xeb2(%rip),%rax
movsbl (%rax,%rcx,1),%esi
mov    -0x8(%rbp),%rax
movslq -0x10(%rbp),%rcx
movsbl (%rax,%rcx,1),%eax
and    $0xf,%eax
movslq %eax,%rcx
lea    0xe95(%rip),%rax
movsbl (%rax,%rcx,1),%edx
lea    0xe9b(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x10(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x10(%rbp)
jmp    1126 <hexdump+0x16>
lea    0xe85(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<hexdump>:
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
test   %esi,%esi
jle    117c <hexdump+0x5c>
mov    %rdi,%r15
mov    %esi,%r12d
lea    0xec6(%rip),%r13
lea    0xed0(%rip),%r14
xor    %ebx,%ebx
cs nopw 0x0(%rax,%rax,1)
nopl   (%rax)
movzbl (%r15,%rbx,1),%eax
mov    %rax,%rcx
shr    $0x4,%rcx
movsbl (%rcx,%r13,1),%esi
and    $0xf,%eax
movsbl (%rax,%r13,1),%edx
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
add    $0x1,%rbx
cmp    %rbx,%r12
jne    1150 <hexdump+0x30>
mov    $0xa,%edi
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
jmp    1030 <putchar@plt>

LLVM IR (-O0):
@hexdump.hex = internal constant [17 x i8] c"0123456789abcdef\00"
@.str = [6 x i8] c"%c%c \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
store i8* %0, i8** %3
store i32 %1, i32* %4
store i32 0, i32* %5
br label %6
6: ; preds = %35, %2
%7 = load i32, i32* %5
%8 = load i32, i32* %4
%9 = icmp slt i32 %7, %8
br i1 %9, label %10, label %38
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 = sext i8 %15 to i32
%17 = ashr i32 %16, 4
%18 = and i32 %17, 15
%19 = sext i32 %18 to i64
%20 = getelementptr inbounds [17 x i8], [17 x i8]* @hexdump.hex, i64 0, i64 %19
%21 = load i8, i8* %20
%22 = sext i8 %21 to i32
%23 = load i8*, i8** %3
%24 = load i32, i32* %5
%25 = sext i32 %24 to i64
%26 = getelementptr inbounds i8, i8* %23, i64 %25
%27 = load i8, i8* %26
%28 = sext i8 %27 to i32
%29 = and i32 %28, 15
%30 = sext i32 %29 to i64
%31 = getelementptr inbounds [17 x i8], [17 x i8]* @hexdump.hex, i64 0, i64 %30
%32 = load i8, i8* %31
%33 = sext i8 %32 to i32
%34 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i32 %22, i32 %33)
br label %35
35: ; preds = %10
%36 = load i32, i32* %5
%37 = add nsw i32 %36, 1
store i32 %37, i32* %5
br label %6
38: ; preds = %6
%39 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
ret void
}

LLVM IR (-O2):
@hexdump.hex = internal unnamed_addr constant [17 x i8] c"0123456789abcdef\00"
@.str = [6 x i8] c"%c%c \00"
define void @hexdump(i8* nocapture %0, i32 %1) {
%3 = icmp sgt i32 %1, 0
br i1 %3, label %4, label %24
4: ; preds = %2
%5 = zext i32 %1 to i64
br label %6
6: ; preds = %4, %6
%7 = phi i64 [ 0, %4 ], [ %22, %6 ]
%8 = getelementptr inbounds i8, i8* %0, i64 %7
%9 = load i8, i8* %8
%10 = zext i8 %9 to i32
%11 = lshr i32 %10, 4
%12 = zext i32 %11 to i64
%13 = getelementptr inbounds [17 x i8], [17 x i8]* @hexdump.hex, i64 0, i64 %12
%14 = load i8, i8* %13
%15 = sext i8 %14 to i32
%16 = and i32 %10, 15
%17 = zext i32 %16 to i64
%18 = getelementptr inbounds [17 x i8], [17 x i8]* @hexdump.hex, i64 0, i64 %17
%19 = load i8, i8* %18
%20 = sext i8 %19 to i32
%21 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i32 %15, i32 %20)
%22 = add nuw nsw i64 %7, 1
%23 = icmp eq i64 %22, %5
br i1 %23, label %24, label %6
24: ; preds = %6, %2
%25 = tail call i32 @putchar(i32 10)
ret void
}