#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 EXIT_FAILURE;
int /*<<< orphan*/ exit(int);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, ...);
int /*<<< orphan*/ free(char *);
char *malloc(int /*<<< orphan*/);
int /*<<< orphan*/ stderr;
int /*<<< orphan*/ strcpy(char *, char *);
int /*<<< orphan*/ strlen(char *);
int main(int argc, char *argv[]) {
  char *ptr;
  if (argc < 2) {
    fprintf(stderr, "usage: %s <string>\n", argv[0]);
    exit(1);
  }
  fprintf(stderr, "Allocating. string...\n");
  ptr = malloc(strlen(argv[1]));
  if (ptr == NULL)
    exit(EXIT_FAILURE);
  fprintf(stderr, "Using string...\n");
  strcpy(ptr, argv[1]);
  fprintf(stderr, "Freeing string...\n");
  free(ptr);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x2,-0x8(%rbp)
jge    11a8 <main+0x48>
mov    0x2e59(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rax
mov    (%rax),%rdx
lea    0xe69(%rip),%rsi
mov    $0x0,%al
call   1060 <fprintf@plt>
mov    $0x1,%edi
call   1080 <exit@plt>
mov    0x2e31(%rip),%rax
mov    (%rax),%edi
lea    0xe5c(%rip),%rsi
mov    $0x0,%al
call   1060 <fprintf@plt>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1050 <strlen@plt>
mov    %eax,%edi
call   1070 <malloc@plt>
mov    %rax,-0x18(%rbp)
cmpq   $0x0,-0x18(%rbp)
jne    11f0 <main+0x90>
mov    0x2def(%rip),%rax
mov    (%rax),%edi
call   1080 <exit@plt>
mov    0x2de9(%rip),%rax
mov    (%rax),%edi
lea    0xe2b(%rip),%rsi
mov    $0x0,%al
call   1060 <fprintf@plt>
mov    -0x18(%rbp),%rdi
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rsi
call   1040 <strcpy@plt>
mov    0x2dc1(%rip),%rax
mov    (%rax),%edi
lea    0xe14(%rip),%rsi
mov    $0x0,%al
call   1060 <fprintf@plt>
mov    -0x18(%rbp),%rdi
call   1030 <free@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %rbx
mov    %rsi,%r14
mov    %edi,%eax
mov    0x2e6f(%rip),%r15
mov    (%r15),%edi
cmp    $0x1,%eax
jle    11dd <main+0x7d>
lea    0xe94(%rip),%rsi
xor    %eax,%eax
call   1060 <fprintf@plt>
mov    0x8(%r14),%rdi
call   1050 <strlen@plt>
mov    %eax,%edi
call   1070 <malloc@plt>
test   %rax,%rax
je     11f8 <main+0x98>
mov    %rax,%rbx
mov    (%r15),%edi
lea    0xe82(%rip),%rsi
xor    %eax,%eax
call   1060 <fprintf@plt>
mov    0x8(%r14),%rsi
mov    %rbx,%rdi
call   1040 <strcpy@plt>
mov    (%r15),%edi
lea    0xe76(%rip),%rsi
xor    %eax,%eax
call   1060 <fprintf@plt>
mov    %rbx,%rdi
call   1030 <free@plt>
xor    %eax,%eax
pop    %rbx
pop    %r14
pop    %r15
ret
mov    (%r14),%rdx
lea    0xe19(%rip),%rsi
xor    %eax,%eax
call   1060 <fprintf@plt>
mov    $0x1,%edi
call   1080 <exit@plt>
mov    0x2dd9(%rip),%rax
mov    (%rax),%edi
call   1080 <exit@plt>

LLVM IR (-O0):
@stderr = global i32 0
@.str = [20 x i8] c"usage: %s <string>\0A\00"
@.str.1 = [23 x i8] c"Allocating. string...\0A\00"
@EXIT_FAILURE = global i32 0
@.str.2 = [17 x i8] c"Using string...\0A\00"
@.str.3 = [19 x i8] c"Freeing string...\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i8*
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%7 = load i32, i32* %4
%8 = icmp slt i32 %7, 2
br i1 %8, label %9, label %16
9: ; preds = %2
%10 = load i32, i32* @stderr
%11 = load i8**, i8*** %5
%12 = getelementptr inbounds i8*, i8** %11, i64 0
%13 = load i8*, i8** %12
%14 = call i32 (i32, i8*, ...) @fprintf(i32 %10, i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str, i64 0, i64 0), i8* %13)
%15 = call i32 @exit(i32 1)
unreachable
16: ; preds = %2
%17 = load i32, i32* @stderr
%18 = call i32 (i32, i8*, ...) @fprintf(i32 %17, i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.1, i64 0, i64 0))
%19 = load i8**, i8*** %5
%20 = getelementptr inbounds i8*, i8** %19, i64 1
%21 = load i8*, i8** %20
%22 = call i32 @strlen(i8* %21)
%23 = call i8* @malloc(i32 %22)
store i8* %23, i8** %6
%24 = load i8*, i8** %6
%25 = icmp eq i8* %24, null
br i1 %25, label %26, label %29
26: ; preds = %16
%27 = load i32, i32* @EXIT_FAILURE
%28 = call i32 @exit(i32 %27)
unreachable
29: ; preds = %16
%30 = load i32, i32* @stderr
%31 = call i32 (i32, i8*, ...) @fprintf(i32 %30, i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.2, i64 0, i64 0))
%32 = load i8*, i8** %6
%33 = load i8**, i8*** %5
%34 = getelementptr inbounds i8*, i8** %33, i64 1
%35 = load i8*, i8** %34
%36 = call i32 @strcpy(i8* %32, i8* %35)
%37 = load i32, i32* @stderr
%38 = call i32 (i32, i8*, ...) @fprintf(i32 %37, i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.3, i64 0, i64 0))
%39 = load i8*, i8** %6
%40 = call i32 @free(i8* %39)
ret i32 0
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [20 x i8] c"usage: %s <string>\0A\00"
@.str.1 = [23 x i8] c"Allocating. string...\0A\00"
@EXIT_FAILURE = global i32 0
@.str.2 = [17 x i8] c"Using string...\0A\00"
@.str.3 = [19 x i8] c"Freeing string...\0A\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp slt i32 %0, 2
%4 = load i32, i32* @stderr
br i1 %3, label %5, label %9
5: ; preds = %2
%6 = load i8*, i8** %1
%7 = tail call i32 (i32, i8*, ...) @fprintf(i32 %4, i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str, i64 0, i64 0), i8* %6)
%8 = tail call i32 @exit(i32 1)
unreachable
9: ; preds = %2
%10 = tail call i32 (i32, i8*, ...) @fprintf(i32 %4, i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.1, i64 0, i64 0))
%11 = getelementptr inbounds i8*, i8** %1, i64 1
%12 = load i8*, i8** %11
%13 = tail call i32 @strlen(i8* %12)
%14 = tail call i8* @malloc(i32 %13)
%15 = icmp eq i8* %14, null
br i1 %15, label %16, label %19
16: ; preds = %9
%17 = load i32, i32* @EXIT_FAILURE
%18 = tail call i32 @exit(i32 %17)
unreachable
19: ; preds = %9
%20 = load i32, i32* @stderr
%21 = tail call i32 (i32, i8*, ...) @fprintf(i32 %20, i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.2, i64 0, i64 0))
%22 = load i8*, i8** %11
%23 = tail call i32 @strcpy(i8* %14, i8* %22)
%24 = load i32, i32* @stderr
%25 = tail call i32 (i32, i8*, ...) @fprintf(i32 %24, i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.3, i64 0, i64 0))
%26 = tail call i32 @free(i8* %14)
ret i32 0
}