#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 *, ...);
int print_msg_buffer(unsigned char *buffer, int len) {
  int i;
  for (i = 0; i < len; i++) {
    printf("%.2x ", buffer[i]);
    if ((i + 1) % 16 == 0)
      printf("\n");
  }
  printf("\n");
  return 0;
}


x86 assembly (clang, -O0):
<print_msg_buffer>:
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    1184 <print_msg_buffer+0x74>
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    $0x10,%ecx
cltd
idiv   %ecx
cmp    $0x0,%edx
jne    1171 <print_msg_buffer+0x61>
lea    0xe9c(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
jmp    1176 <print_msg_buffer+0x66>
mov    -0x10(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x10(%rbp)
jmp    1126 <print_msg_buffer+0x16>
lea    0xe7b(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<print_msg_buffer>:
push   %r15
push   %r14
push   %r12
push   %rbx
push   %rax
test   %esi,%esi
jle    1183 <print_msg_buffer+0x63>
mov    %rdi,%r15
mov    %esi,%r12d
neg    %r12
mov    $0x1,%ebx
lea    0xebf(%rip),%r14
jmp    1162 <print_msg_buffer+0x42>
cs nopw 0x0(%rax,%rax,1)
nopl   (%rax)
lea    (%r12,%rbx,1),%rax
add    $0x1,%rax
add    $0x1,%rbx
cmp    $0x1,%rax
je     1183 <print_msg_buffer+0x63>
movzbl -0x1(%r15,%rbx,1),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
test   $0xf,%bl
jne    1150 <print_msg_buffer+0x30>
mov    $0xa,%edi
call   1030 <putchar@plt>
jmp    1150 <print_msg_buffer+0x30>
mov    $0xa,%edi
call   1030 <putchar@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [6 x i8] c"%.2x \00"
@.str.1 = [2 x i8] c"\0A\00"
define i32 @print_msg_buffer(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 = %25, %2
%7 = load i32, i32* %5
%8 = load i32, i32* %4
%9 = icmp slt i32 %7, %8
br i1 %9, label %10, label %28
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 = zext i8 %15 to i32
%17 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i32 %16)
%18 = load i32, i32* %5
%19 = add nsw i32 %18, 1
%20 = srem i32 %19, 16
%21 = icmp eq i32 %20, 0
br i1 %21, label %22, label %24
22: ; preds = %10
%23 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
br label %24
24: ; preds = %22, %10
br label %25
25: ; preds = %24
%26 = load i32, i32* %5
%27 = add nsw i32 %26, 1
store i32 %27, i32* %5
br label %6
28: ; preds = %6
%29 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
ret i32 0
}

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