#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 */
typedef int uint8_t;
typedef unsigned int uint32_t;

/* Variables and functions */
int /*<<< orphan*/ printf(char *, ...);
void print_tag(const void *out, uint32_t outlen) {
  unsigned i;
  if (out != NULL) {
    printf("Tag: ");
    for (i = 0; i < outlen; ++i) {
      printf("%2.2x ", ((uint8_t *)out)[i]);
    }
    printf("\n");
  }
}


x86 assembly (clang, -O0):
<print_tag>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x8(%rbp)
mov    %esi,-0xc(%rbp)
cmpq   $0x0,-0x8(%rbp)
je     117f <print_tag+0x6f>
lea    0xecf(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x0,-0x10(%rbp)
mov    -0x10(%rbp),%eax
cmp    -0xc(%rbp),%eax
jae    1171 <print_tag+0x61>
mov    -0x8(%rbp),%rax
mov    -0x10(%rbp),%ecx
mov    (%rax,%rcx,4),%esi
lea    0xeaa(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x10(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x10(%rbp)
jmp    113f <print_tag+0x2f>
lea    0xe95(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<print_tag>:
test   %rdi,%rdi
je     117b <print_tag+0x5b>
push   %rbp
push   %r15
push   %r14
push   %rbx
push   %rax
mov    %esi,%ebp
mov    %rdi,%r15
lea    0xec8(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
test   %ebp,%ebp
je     1167 <print_tag+0x47>
mov    %ebp,%ebp
lea    0xeba(%rip),%r14
xor    %ebx,%ebx
xchg   %ax,%ax
mov    (%r15,%rbx,4),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
add    $0x1,%rbx
cmp    %rbx,%rbp
jne    1150 <print_tag+0x30>
mov    $0xa,%edi
add    $0x8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
jmp    1030 <putchar@plt>
ret

LLVM IR (-O0):
@.str = [6 x i8] c"Tag: \00"
@.str.1 = [7 x i8] c"%2.2x \00"
@.str.2 = [2 x i8] c"\0A\00"
define void @print_tag(i8* %0, i32 %1) {
%3 = alloca i8*
%4 = alloca i32
%5 = alloca i32
store i8* %0, i8** %3
store i32 %1, i32* %4
%6 = load i8*, i8** %3
%7 = icmp ne i8* %6, null
br i1 %7, label %8, label %27
8: ; preds = %2
%9 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0))
store i32 0, i32* %5
br label %10
10: ; preds = %22, %8
%11 = load i32, i32* %5
%12 = load i32, i32* %4
%13 = icmp ult i32 %11, %12
br i1 %13, label %14, label %25
14: ; preds = %10
%15 = load i8*, i8** %3
%16 = bitcast i8* %15 to i32*
%17 = load i32, i32* %5
%18 = zext i32 %17 to i64
%19 = getelementptr inbounds i32, i32* %16, i64 %18
%20 = load i32, i32* %19
%21 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.1, i64 0, i64 0), i32 %20)
br label %22
22: ; preds = %14
%23 = load i32, i32* %5
%24 = add i32 %23, 1
store i32 %24, i32* %5
br label %10
25: ; preds = %10
%26 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0))
br label %27
27: ; preds = %25, %2
ret void
}

LLVM IR (-O2):
@.str = [6 x i8] c"Tag: \00"
@.str.1 = [7 x i8] c"%2.2x \00"
define void @print_tag(i8* %0, i32 %1) {
%3 = icmp eq i8* %0, null
br i1 %3, label %19, label %4
4: ; preds = %2
%5 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0))
%6 = icmp eq i32 %1, 0
br i1 %6, label %17, label %7
7: ; preds = %4
%8 = bitcast i8* %0 to i32*
%9 = zext i32 %1 to i64
br label %10
10: ; preds = %7, %10
%11 = phi i64 [ 0, %7 ], [ %15, %10 ]
%12 = getelementptr inbounds i32, i32* %8, i64 %11
%13 = load i32, i32* %12
%14 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([7 x i8], [7 x i8]* @.str.1, i64 0, i64 0), i32 %13)
%15 = add nuw nsw i64 %11, 1
%16 = icmp eq i64 %15, %9
br i1 %16, label %17, label %10
17: ; preds = %10, %4
%18 = tail call i32 @putchar(i32 10)
br label %19
19: ; preds = %17, %2
ret void
}