#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*/ exit(int);
scalar_t__ malloc(int);
int /*<<< orphan*/ perror(char *);
int /*<<< orphan*/ strcpy(char *, char *);
int strlen(char *);
char *make_string(char *buf) {
  char *cp;
  buf[strlen(buf) - 1] = '\0';
  cp = (char *)malloc(strlen(buf) + 1);
  if (cp == NULL) {
    perror("malloc() failed");
    exit(1);
  }
  strcpy(cp, buf);
  return cp;
}


x86 assembly (clang, -O0):
<make_string>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rax
mov    %rax,-0x18(%rbp)
mov    -0x8(%rbp),%rdi
call   1040 <strlen@plt>
mov    %eax,%ecx
mov    -0x18(%rbp),%rax
sub    $0x1,%ecx
movslq %ecx,%rcx
movb   $0x0,(%rax,%rcx,1)
mov    -0x8(%rbp),%rdi
call   1040 <strlen@plt>
mov    %eax,%edi
add    $0x1,%edi
call   1050 <malloc@plt>
mov    %rax,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
jne    11b5 <make_string+0x65>
lea    0xe5a(%rip),%rdi
call   1060 <perror@plt>
mov    $0x1,%edi
call   1070 <exit@plt>
mov    -0x10(%rbp),%rdi
mov    -0x8(%rbp),%rsi
call   1030 <strcpy@plt>
mov    -0x10(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<make_string>:
push   %r14
push   %rbx
push   %rax
mov    %rdi,%r14
call   1040 <strlen@plt>
cltq
movb   $0x0,-0x1(%rax,%r14,1)
mov    %r14,%rdi
call   1040 <strlen@plt>
lea    0x1(%rax),%edi
call   1050 <malloc@plt>
test   %rax,%rax
je     1192 <make_string+0x42>
mov    %rax,%rbx
mov    %rax,%rdi
mov    %r14,%rsi
call   1030 <strcpy@plt>
mov    %rbx,%rax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret
lea    0xe67(%rip),%rdi
call   1060 <perror@plt>
mov    $0x1,%edi
call   1070 <exit@plt>

LLVM IR (-O0):
@.str = [16 x i8] c"malloc() failed\00"
define i8* @make_string(i8* %0) {
%2 = alloca i8*
%3 = alloca i8*
store i8* %0, i8** %2
%4 = load i8*, i8** %2
%5 = load i8*, i8** %2
%6 = call i32 @strlen(i8* %5)
%7 = sub nsw i32 %6, 1
%8 = sext i32 %7 to i64
%9 = getelementptr inbounds i8, i8* %4, i64 %8
store i8 0, i8* %9
%10 = load i8*, i8** %2
%11 = call i32 @strlen(i8* %10)
%12 = add nsw i32 %11, 1
%13 = call i64 @malloc(i32 %12)
%14 = inttoptr i64 %13 to i8*
store i8* %14, i8** %3
%15 = load i8*, i8** %3
%16 = icmp eq i8* %15, null
br i1 %16, label %17, label %20
17: ; preds = %1
%18 = call i32 @perror(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str, i64 0, i64 0))
%19 = call i32 @exit(i32 1)
unreachable
20: ; preds = %1
%21 = load i8*, i8** %3
%22 = load i8*, i8** %2
%23 = call i32 @strcpy(i8* %21, i8* %22)
%24 = load i8*, i8** %3
ret i8* %24
}

LLVM IR (-O2):
@.str = [16 x i8] c"malloc() failed\00"
define i8* @make_string(i8* %0) {
%2 = tail call i32 @strlen(i8* %0)
%3 = add nsw i32 %2, -1
%4 = sext i32 %3 to i64
%5 = getelementptr inbounds i8, i8* %0, i64 %4
store i8 0, i8* %5
%6 = tail call i32 @strlen(i8* %0)
%7 = add nsw i32 %6, 1
%8 = tail call i64 @malloc(i32 %7)
%9 = inttoptr i64 %8 to i8*
%10 = icmp eq i64 %8, 0
br i1 %10, label %11, label %14
11: ; preds = %1
%12 = tail call i32 @perror(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str, i64 0, i64 0))
%13 = tail call i32 @exit(i32 1)
unreachable
14: ; preds = %1
%15 = tail call i32 @strcpy(i8* %9, i8* %0)
ret i8* %9
}