#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 printf_buf_hex_16(unsigned char *buf, int size, char *header) {
  int i;
  if (header)
    printf("%s", header);
  for (i = 0; i < size; i++) {
    if (!(i % 16))
      printf("\n");
    printf("%02x ", buf[i]);
  }
  printf("\n");
  return;
}


x86 assembly (clang, -O0):
<printf_buf_hex_16>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %esi,-0xc(%rbp)
mov    %rdx,-0x18(%rbp)
cmpq   $0x0,-0x18(%rbp)
je     1140 <printf_buf_hex_16+0x30>
mov    -0x18(%rbp),%rsi
lea    0xec7(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x0,-0x1c(%rbp)
mov    -0x1c(%rbp),%eax
cmp    -0xc(%rbp),%eax
jge    119d <printf_buf_hex_16+0x8d>
mov    -0x1c(%rbp),%eax
mov    $0x10,%ecx
cltd
idiv   %ecx
cmp    $0x0,%edx
jne    1175 <printf_buf_hex_16+0x65>
lea    0xe95(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x8(%rbp),%rax
movslq -0x1c(%rbp),%rcx
movzbl (%rax,%rcx,1),%esi
lea    0xe7d(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x1c(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x1c(%rbp)
jmp    1147 <printf_buf_hex_16+0x37>
lea    0xe5f(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<printf_buf_hex_16>:
push   %rbp
push   %r15
push   %r14
push   %rbx
push   %rax
mov    %esi,%ebp
mov    %rdi,%r15
test   %rdx,%rdx
je     1142 <printf_buf_hex_16+0x22>
lea    0xec8(%rip),%rdi
mov    %rdx,%rsi
xor    %eax,%eax
call   1040 <printf@plt>
test   %ebp,%ebp
jle    1189 <printf_buf_hex_16+0x69>
mov    %ebp,%ebp
lea    0xeb4(%rip),%r14
xor    %ebx,%ebx
jmp    1178 <printf_buf_hex_16+0x58>
cs nopw 0x0(%rax,%rax,1)
nopl   (%rax)
movzbl (%r15,%rbx,1),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
add    $0x1,%rbx
cmp    %rbx,%rbp
je     1189 <printf_buf_hex_16+0x69>
test   $0xf,%bl
jne    1160 <printf_buf_hex_16+0x40>
mov    $0xa,%edi
call   1030 <putchar@plt>
jmp    1160 <printf_buf_hex_16+0x40>
mov    $0xa,%edi
add    $0x8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
jmp    1030 <putchar@plt>

LLVM IR (-O0):
@.str = [3 x i8] c"%s\00"
@.str.1 = [2 x i8] c"\0A\00"
@.str.2 = [6 x i8] c"%02x \00"
define void @printf_buf_hex_16(i8* %0, i32 %1, i8* %2) {
%4 = alloca i8*
%5 = alloca i32
%6 = alloca i8*
%7 = alloca i32
store i8* %0, i8** %4
store i32 %1, i32* %5
store i8* %2, i8** %6
%8 = load i8*, i8** %6
%9 = icmp ne i8* %8, null
br i1 %9, label %10, label %13
10: ; preds = %3
%11 = load i8*, i8** %6
%12 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i8* %11)
br label %13
13: ; preds = %10, %3
store i32 0, i32* %7
br label %14
14: ; preds = %32, %13
%15 = load i32, i32* %7
%16 = load i32, i32* %5
%17 = icmp slt i32 %15, %16
br i1 %17, label %18, label %35
18: ; preds = %14
%19 = load i32, i32* %7
%20 = srem i32 %19, 16
%21 = icmp ne i32 %20, 0
br i1 %21, label %24, label %22
22: ; preds = %18
%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, %18
%25 = load i8*, i8** %4
%26 = load i32, i32* %7
%27 = sext i32 %26 to i64
%28 = getelementptr inbounds i8, i8* %25, i64 %27
%29 = load i8, i8* %28
%30 = zext i8 %29 to i32
%31 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.2, i64 0, i64 0), i32 %30)
br label %32
32: ; preds = %24
%33 = load i32, i32* %7
%34 = add nsw i32 %33, 1
store i32 %34, i32* %7
br label %14
35: ; preds = %14
%36 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
ret void
}

LLVM IR (-O2):
@.str = [3 x i8] c"%s\00"
@.str.2 = [6 x i8] c"%02x \00"
define void @printf_buf_hex_16(i8* nocapture %0, i32 %1, i8* %2) {
%4 = icmp eq i8* %2, null
br i1 %4, label %7, label %5
5: ; preds = %3
%6 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i8* %2)
br label %7
7: ; preds = %5, %3
%8 = icmp sgt i32 %1, 0
br i1 %8, label %9, label %24
9: ; preds = %7
%10 = zext i32 %1 to i64
br label %11
11: ; preds = %9, %17
%12 = phi i64 [ 0, %9 ], [ %22, %17 ]
%13 = and i64 %12, 15
%14 = icmp eq i64 %13, 0
br i1 %14, label %15, label %17
15: ; preds = %11
%16 = tail call i32 @putchar(i32 10)
br label %17
17: ; preds = %15, %11
%18 = getelementptr inbounds i8, i8* %0, i64 %12
%19 = load i8, i8* %18
%20 = zext i8 %19 to i32
%21 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([6 x i8], [6 x i8]* @.str.2, i64 0, i64 0), i32 %20)
%22 = add nuw nsw i64 %12, 1
%23 = icmp eq i64 %22, %10
br i1 %23, label %24, label %11
24: ; preds = %17, %7
%25 = tail call i32 @putchar(i32 10)
ret void
}