#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 */
char *malloc(int);
int /*<<< orphan*/ strcpy(char *, char const *);
int strlen(char const *);
char *make_devname(const char *path, const char *name) {
  int plen = strlen(path);
  int nlen = strlen(name);
  char *devname = malloc(plen + nlen + 2);
  strcpy(devname, path);
  devname[plen] = '/';
  strcpy(devname + plen + 1, name);
  return devname;
}


x86 assembly (clang, -O0):
<make_devname>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    -0x8(%rbp),%rdi
call   1040 <strlen@plt>
mov    %eax,-0x14(%rbp)
mov    -0x10(%rbp),%rdi
call   1040 <strlen@plt>
mov    %eax,-0x18(%rbp)
mov    -0x14(%rbp),%edi
add    -0x18(%rbp),%edi
add    $0x2,%edi
call   1050 <malloc@plt>
mov    %rax,-0x20(%rbp)
mov    -0x20(%rbp),%rdi
mov    -0x8(%rbp),%rsi
call   1030 <strcpy@plt>
mov    -0x20(%rbp),%rax
movslq -0x14(%rbp),%rcx
movb   $0x2f,(%rax,%rcx,1)
mov    -0x20(%rbp),%rdi
movslq -0x14(%rbp),%rax
add    %rax,%rdi
add    $0x1,%rdi
mov    -0x10(%rbp),%rsi
call   1030 <strcpy@plt>
mov    -0x20(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<make_devname>:
push   %r15
push   %r14
push   %r12
push   %rbx
push   %rax
mov    %rsi,%r14
mov    %rdi,%r15
call   1040 <strlen@plt>
mov    %eax,%r12d
mov    %r14,%rdi
call   1040 <strlen@plt>
lea    (%r12,%rax,1),%edi
add    $0x2,%edi
call   1050 <malloc@plt>
mov    %rax,%rbx
mov    %rax,%rdi
mov    %r15,%rsi
call   1030 <strcpy@plt>
movslq %r12d,%rax
movb   $0x2f,(%rbx,%rax,1)
lea    (%rbx,%rax,1),%rdi
add    $0x1,%rdi
mov    %r14,%rsi
call   1030 <strcpy@plt>
mov    %rbx,%rax
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
define i8* @make_devname(i8* %0, i8* %1) {
%3 = alloca i8*
%4 = alloca i8*
%5 = alloca i32
%6 = alloca i32
%7 = alloca i8*
store i8* %0, i8** %3
store i8* %1, i8** %4
%8 = load i8*, i8** %3
%9 = call i32 @strlen(i8* %8)
store i32 %9, i32* %5
%10 = load i8*, i8** %4
%11 = call i32 @strlen(i8* %10)
store i32 %11, i32* %6
%12 = load i32, i32* %5
%13 = load i32, i32* %6
%14 = add nsw i32 %12, %13
%15 = add nsw i32 %14, 2
%16 = call i8* @malloc(i32 %15)
store i8* %16, i8** %7
%17 = load i8*, i8** %7
%18 = load i8*, i8** %3
%19 = call i32 @strcpy(i8* %17, i8* %18)
%20 = load i8*, i8** %7
%21 = load i32, i32* %5
%22 = sext i32 %21 to i64
%23 = getelementptr inbounds i8, i8* %20, i64 %22
store i8 47, i8* %23
%24 = load i8*, i8** %7
%25 = load i32, i32* %5
%26 = sext i32 %25 to i64
%27 = getelementptr inbounds i8, i8* %24, i64 %26
%28 = getelementptr inbounds i8, i8* %27, i64 1
%29 = load i8*, i8** %4
%30 = call i32 @strcpy(i8* %28, i8* %29)
%31 = load i8*, i8** %7
ret i8* %31
}

LLVM IR (-O2):
define i8* @make_devname(i8* %0, i8* %1) {
%3 = tail call i32 @strlen(i8* %0)
%4 = tail call i32 @strlen(i8* %1)
%5 = add i32 %3, 2
%6 = add i32 %5, %4
%7 = tail call i8* @malloc(i32 %6)
%8 = tail call i32 @strcpy(i8* %7, i8* %0)
%9 = sext i32 %3 to i64
%10 = getelementptr inbounds i8, i8* %7, i64 %9
store i8 47, i8* %10
%11 = getelementptr inbounds i8, i8* %10, i64 1
%12 = tail call i32 @strcpy(i8* %11, i8* %1)
ret i8* %7
}