#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*/ fprintf(int /*<<< orphan*/, char *, ...);
int /*<<< orphan*/ stderr;
void hex_print(const unsigned char *output, size_t n) {
  size_t i;
  for (i = 0; i < n; ++i) {
    fprintf(stderr, "%02x", output[i]);
  }
  fprintf(stderr, "\n");
}


x86 assembly (clang, -O0):
<hex_print>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
movq   $0x0,-0x18(%rbp)
mov    -0x18(%rbp),%rax
cmp    -0x10(%rbp),%rax
jae    116a <hex_print+0x5a>
mov    0x2ea3(%rip),%rax
mov    (%rax),%edi
mov    -0x8(%rbp),%rax
mov    -0x18(%rbp),%rcx
movzbl (%rax,%rcx,1),%edx
lea    0xeae(%rip),%rsi
mov    $0x0,%al
call   1030 <fprintf@plt>
mov    -0x18(%rbp),%rax
add    $0x1,%rax
mov    %rax,-0x18(%rbp)
jmp    1128 <hex_print+0x18>
mov    0x2e6f(%rip),%rax
mov    (%rax),%edi
lea    0xe8b(%rip),%rsi
mov    $0x0,%al
call   1030 <fprintf@plt>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<hex_print>:
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
test   %rsi,%rsi
je     115c <hex_print+0x4c>
mov    %rsi,%r13
mov    %rdi,%r14
mov    0x2eb5(%rip),%r12
lea    0xece(%rip),%r15
xor    %ebx,%ebx
cs nopw 0x0(%rax,%rax,1)
xchg   %ax,%ax
mov    (%r12),%edi
movzbl (%r14,%rbx,1),%edx
mov    %r15,%rsi
xor    %eax,%eax
call   1030 <fprintf@plt>
add    $0x1,%rbx
cmp    %rbx,%r13
jne    1140 <hex_print+0x30>
mov    0x2e7d(%rip),%rax
mov    (%rax),%edi
lea    0xe99(%rip),%rsi
xor    %eax,%eax
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
jmp    1030 <fprintf@plt>

LLVM IR (-O0):
@stderr = global i32 0
@.str = [5 x i8] c"%02x\00"
@.str.1 = [2 x i8] c"\0A\00"
define void @hex_print(i8* %0, i64 %1) {
%3 = alloca i8*
%4 = alloca i64
%5 = alloca i64
store i8* %0, i8** %3
store i64 %1, i64* %4
store i64 0, i64* %5
br label %6
6: ; preds = %18, %2
%7 = load i64, i64* %5
%8 = load i64, i64* %4
%9 = icmp ult i64 %7, %8
br i1 %9, label %10, label %21
10: ; preds = %6
%11 = load i32, i32* @stderr
%12 = load i8*, i8** %3
%13 = load i64, i64* %5
%14 = getelementptr inbounds i8, i8* %12, i64 %13
%15 = load i8, i8* %14
%16 = zext i8 %15 to i32
%17 = call i32 (i32, i8*, ...) @fprintf(i32 %11, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %16)
br label %18
18: ; preds = %10
%19 = load i64, i64* %5
%20 = add i64 %19, 1
store i64 %20, i64* %5
br label %6
21: ; preds = %6
%22 = load i32, i32* @stderr
%23 = call i32 (i32, i8*, ...) @fprintf(i32 %22, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
ret void
}

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