#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 print_buf(const unsigned char *buf, size_t len) {
  size_t i;
  printf("\n");
  for (i = 0; i < len; i++) {
    printf("%02x ", buf[i]);
  }
  printf("\n");
}


x86 assembly (clang, -O0):
<print_buf>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
lea    0xed9(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movq   $0x0,-0x18(%rbp)
mov    -0x18(%rbp),%rax
cmp    -0x10(%rbp),%rax
jae    116f <print_buf+0x5f>
mov    -0x8(%rbp),%rax
mov    -0x18(%rbp),%rcx
movzbl (%rax,%rcx,1),%esi
lea    0xeab(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x18(%rbp),%rax
add    $0x1,%rax
mov    %rax,-0x18(%rbp)
jmp    1136 <print_buf+0x26>
lea    0xe8a(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<print_buf>:
push   %r15
push   %r14
push   %r12
push   %rbx
push   %rax
mov    %rsi,%r12
mov    %rdi,%r14
mov    $0xa,%edi
call   1030 <putchar@plt>
test   %r12,%r12
je     1168 <print_buf+0x48>
lea    0xebc(%rip),%r15
xor    %ebx,%ebx
cs nopw 0x0(%rax,%rax,1)
movzbl (%r14,%rbx,1),%esi
mov    %r15,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
add    $0x1,%rbx
cmp    %rbx,%r12
jne    1150 <print_buf+0x30>
mov    $0xa,%edi
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
jmp    1030 <putchar@plt>

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

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