#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 pr_bytesmsg(const char *msg, unsigned char *bytes, size_t nbytes) {
  size_t i;
  printf("%s", msg);
  for (i = 0; i < nbytes; i++)
    printf("%02x", bytes[i]);
  printf("\n");
}


x86 assembly (clang, -O0):
<pr_bytesmsg>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    %rdx,-0x18(%rbp)
mov    -0x8(%rbp),%rsi
lea    0xed1(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movq   $0x0,-0x20(%rbp)
mov    -0x20(%rbp),%rax
cmp    -0x18(%rbp),%rax
jae    1177 <pr_bytesmsg+0x67>
mov    -0x10(%rbp),%rax
mov    -0x20(%rbp),%rcx
movzbl (%rax,%rcx,1),%esi
lea    0xea4(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x20(%rbp),%rax
add    $0x1,%rax
mov    %rax,-0x20(%rbp)
jmp    113e <pr_bytesmsg+0x2e>
lea    0xe8a(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<pr_bytesmsg>:
push   %r15
push   %r14
push   %r12
push   %rbx
push   %rax
mov    %rdx,%r12
mov    %rsi,%r14
mov    %rdi,%rsi
lea    0xec8(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
test   %r12,%r12
je     1168 <pr_bytesmsg+0x48>
lea    0xeb8(%rip),%r15
xor    %ebx,%ebx
nopl   (%rax)
movzbl (%r14,%rbx,1),%esi
mov    %r15,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
add    $0x1,%rbx
cmp    %rbx,%r12
jne    1150 <pr_bytesmsg+0x30>
mov    $0xa,%edi
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
jmp    1030 <putchar@plt>

LLVM IR (-O0):
@.str = [3 x i8] c"%s\00"
@.str.1 = [5 x i8] c"%02x\00"
@.str.2 = [2 x i8] c"\0A\00"
define void @pr_bytesmsg(i8* %0, i8* %1, i64 %2) {
%4 = alloca i8*
%5 = alloca i8*
%6 = alloca i64
%7 = alloca i64
store i8* %0, i8** %4
store i8* %1, i8** %5
store i64 %2, i64* %6
%8 = load i8*, i8** %4
%9 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i8* %8)
store i64 0, i64* %7
br label %10
10: ; preds = %21, %3
%11 = load i64, i64* %7
%12 = load i64, i64* %6
%13 = icmp ult i64 %11, %12
br i1 %13, label %14, label %24
14: ; preds = %10
%15 = load i8*, i8** %5
%16 = load i64, i64* %7
%17 = getelementptr inbounds i8, i8* %15, i64 %16
%18 = load i8, i8* %17
%19 = zext i8 %18 to i32
%20 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0), i32 %19)
br label %21
21: ; preds = %14
%22 = load i64, i64* %7
%23 = add i64 %22, 1
store i64 %23, i64* %7
br label %10
24: ; preds = %10
%25 = 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 = [3 x i8] c"%s\00"
@.str.1 = [5 x i8] c"%02x\00"
define void @pr_bytesmsg(i8* %0, i8* nocapture %1, i64 %2) {
%4 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i8* %0)
%5 = icmp eq i64 %2, 0
br i1 %5, label %14, label %6
6: ; preds = %3, %6
%7 = phi i64 [ %12, %6 ], [ 0, %3 ]
%8 = getelementptr inbounds i8, i8* %1, i64 %7
%9 = load i8, i8* %8
%10 = zext i8 %9 to i32
%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 i64 %7, 1
%13 = icmp eq i64 %12, %2
br i1 %13, label %14, label %6
14: ; preds = %6, %3
%15 = tail call i32 @putchar(i32 10)
ret void
}