#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*/ free(char *);
char *malloc(int /*<<< orphan*/);
int /*<<< orphan*/ printf(char *, char *);
int /*<<< orphan*/ strcpy(char *, char *);
int /*<<< orphan*/ strlen(char *);
int main(int argc, char **argv) {
  char *buf;
  if (argc < 2) {
    return -1;
  }
  buf = malloc(strlen(argv[1]));
  strcpy(buf, argv[1]);
  printf("%s\n", buf);
  free(buf);
  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    117c <main+0x2c>
movl   $0xffffffff,-0x4(%rbp)
jmp    11c5 <main+0x75>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1050 <strlen@plt>
mov    %eax,%edi
call   1070 <malloc@plt>
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rdi
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rsi
call   1040 <strcpy@plt>
mov    -0x18(%rbp),%rsi
lea    0xe50(%rip),%rdi
call   1060 <printf@plt>
mov    -0x18(%rbp),%rdi
call   1030 <free@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
mov    $0xffffffff,%eax
cmp    $0x2,%edi
jl     11a0 <main+0x50>
push   %r14
push   %rbx
push   %rax
mov    %rsi,%r14
mov    0x8(%rsi),%rdi
call   1050 <strlen@plt>
mov    %eax,%edi
call   1070 <malloc@plt>
mov    %rax,%rbx
mov    0x8(%r14),%rsi
mov    %rax,%rdi
call   1040 <strcpy@plt>
lea    0xe79(%rip),%rdi
mov    %rbx,%rsi
call   1060 <printf@plt>
mov    %rbx,%rdi
call   1030 <free@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [4 x i8] c"%s\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 %10
9: ; preds = %2
store i32 -1, i32* %3
br label %25
10: ; preds = %2
%11 = load i8**, i8*** %5
%12 = getelementptr inbounds i8*, i8** %11, i64 1
%13 = load i8*, i8** %12
%14 = call i32 @strlen(i8* %13)
%15 = call i8* @malloc(i32 %14)
store i8* %15, i8** %6
%16 = load i8*, i8** %6
%17 = load i8**, i8*** %5
%18 = getelementptr inbounds i8*, i8** %17, i64 1
%19 = load i8*, i8** %18
%20 = call i32 @strcpy(i8* %16, i8* %19)
%21 = load i8*, i8** %6
%22 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8* %21)
%23 = load i8*, i8** %6
%24 = call i32 @free(i8* %23)
store i32 0, i32* %3
br label %25
25: ; preds = %10, %9
%26 = load i32, i32* %3
ret i32 %26
}

LLVM IR (-O2):
@.str = [4 x i8] c"%s\0A\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp slt i32 %0, 2
br i1 %3, label %13, label %4
4: ; preds = %2
%5 = getelementptr inbounds i8*, i8** %1, i64 1
%6 = load i8*, i8** %5
%7 = tail call i32 @strlen(i8* %6)
%8 = tail call i8* @malloc(i32 %7)
%9 = load i8*, i8** %5
%10 = tail call i32 @strcpy(i8* %8, i8* %9)
%11 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8* %8)
%12 = tail call i32 @free(i8* %8)
br label %13
13: ; preds = %2, %4
%14 = phi i32 [ 0, %4 ], [ -1, %2 ]
ret i32 %14
}