#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 dump_hex(unsigned char *s, unsigned int len) {
  for (int i = 0; i < len; i++)
    printf("%02x ", s[i]);
  printf(" [");
  for (int i = 0; i < len; i++)
    printf("%3d ", s[i]);
  printf("]\n");
}


x86 assembly (clang, -O0):
<dump_hex>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %esi,-0xc(%rbp)
movl   $0x0,-0x10(%rbp)
mov    -0x10(%rbp),%eax
cmp    -0xc(%rbp),%eax
jae    115a <dump_hex+0x4a>
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
add    $0x1,%eax
mov    %eax,-0x10(%rbp)
jmp    1126 <dump_hex+0x16>
lea    0xea5(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x0,-0x14(%rbp)
mov    -0x14(%rbp),%eax
cmp    -0xc(%rbp),%eax
jae    11a3 <dump_hex+0x93>
mov    -0x8(%rbp),%rax
movslq -0x14(%rbp),%rcx
movzbl (%rax,%rcx,1),%esi
lea    0xe7b(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    116f <dump_hex+0x5f>
lea    0xe64(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<dump_hex>:
push   %rbp
push   %r15
push   %r14
push   %r12
push   %rbx
test   %esi,%esi
je     119a <dump_hex+0x7a>
mov    %esi,%r14d
mov    %rdi,%r12
mov    %esi,%ebp
lea    0xec5(%rip),%r15
xor    %ebx,%ebx
nopl   (%rax)
movzbl (%r12,%rbx,1),%esi
mov    %r15,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
add    $0x1,%rbx
cmp    %rbx,%rbp
jne    1140 <dump_hex+0x20>
lea    0xea7(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
test   %r14d,%r14d
je     11a8 <dump_hex+0x88>
lea    0xe97(%rip),%r14
xor    %ebx,%ebx
cs nopw 0x0(%rax,%rax,1)
xchg   %ax,%ax
movzbl (%r12,%rbx,1),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
add    $0x1,%rbx
cmp    %rbx,%rbp
jne    1180 <dump_hex+0x60>
jmp    11a8 <dump_hex+0x88>
lea    0xe65(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xe5f(%rip),%rdi
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
pop    %rbp
jmp    1030 <puts@plt>

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

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