#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 scalar_t__ uint64_t;

/* Variables and functions */
int /*<<< orphan*/ printf(char *, ...);
void print_buf(uint8_t *buf, uint64_t size) {
  printf("size = %llu\n", size);
  for (uint64_t i = 0; i < size; i++) {
    printf("%02x", *(uint8_t *)(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)
mov    -0x10(%rbp),%rsi
lea    0xed5(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movq   $0x0,-0x18(%rbp)
mov    -0x18(%rbp),%rax
cmp    -0x10(%rbp),%rax
jge    1172 <print_buf+0x62>
mov    -0x8(%rbp),%rax
mov    -0x18(%rbp),%rcx
mov    (%rax,%rcx,4),%esi
lea    0xeb3(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x18(%rbp),%rax
add    $0x1,%rax
mov    %rax,-0x18(%rbp)
jmp    113a <print_buf+0x2a>
lea    0xe92(%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
lea    0xecb(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
test   %r12,%r12
jle    1167 <print_buf+0x47>
lea    0xec5(%rip),%r15
xor    %ebx,%ebx
nopw   0x0(%rax,%rax,1)
mov    (%r14,%rbx,4),%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 = [13 x i8] c"size = %llu\0A\00"
@.str.1 = [5 x i8] c"%02x\00"
@.str.2 = [2 x i8] c"\0A\00"
define void @print_buf(i32* %0, i64 %1) {
%3 = alloca i32*
%4 = alloca i64
%5 = alloca i64
store i32* %0, i32** %3
store i64 %1, i64* %4
%6 = load i64, i64* %4
%7 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str, i64 0, i64 0), i64 %6)
store i64 0, i64* %5
br label %8
8: ; preds = %18, %2
%9 = load i64, i64* %5
%10 = load i64, i64* %4
%11 = icmp slt i64 %9, %10
br i1 %11, label %12, label %21
12: ; preds = %8
%13 = load i32*, i32** %3
%14 = load i64, i64* %5
%15 = getelementptr inbounds i32, i32* %13, i64 %14
%16 = load i32, i32* %15
%17 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0), i32 %16)
br label %18
18: ; preds = %12
%19 = load i64, i64* %5
%20 = add nsw i64 %19, 1
store i64 %20, i64* %5
br label %8
21: ; preds = %8
%22 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0))
ret void
}

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