#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*/ fprintf(int /*<<< orphan*/, char *, char *);
int /*<<< orphan*/ printf(char *, char *);
int /*<<< orphan*/ stderr;
int /*<<< orphan*/ strcpy(char *, char *);
int main(int argc, char **argv) {
  char buf[20];
  if (argc != 2) {
    fprintf(stderr, "usage: %s data\n", argv[0]);
    return 0;
  }
  strcpy(buf, argv[1]);
  printf("data: %s\n", buf);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x2,-0x8(%rbp)
je     1178 <main+0x48>
mov    0x2e89(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rax
mov    (%rax),%rdx
lea    0xe99(%rip),%rsi
call   1050 <fprintf@plt>
movl   $0x0,-0x4(%rbp)
jmp    11a0 <main+0x70>
lea    -0x30(%rbp),%rdi
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rsi
call   1030 <strcpy@plt>
lea    -0x30(%rbp),%rsi
lea    0xe7c(%rip),%rdi
call   1040 <printf@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x20,%rsp
cmp    $0x2,%edi
jne    115a <main+0x2a>
mov    0x8(%rsi),%rsi
mov    %rsp,%rbx
mov    %rbx,%rdi
call   1030 <strcpy@plt>
lea    0xec0(%rip),%rdi
mov    %rbx,%rsi
call   1040 <printf@plt>
jmp    1172 <main+0x42>
mov    0x2e7f(%rip),%rax
mov    (%rax),%edi
mov    (%rsi),%rdx
lea    0xe93(%rip),%rsi
call   1050 <fprintf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@stderr = global i32 0
@.str = [16 x i8] c"usage: %s data\0A\00"
@.str.1 = [10 x i8] c"data: %s\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca [20 x i8]
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%7 = load i32, i32* %4
%8 = icmp ne i32 %7, 2
br i1 %8, label %9, label %15
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 @fprintf(i32 %10, i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str, i64 0, i64 0), i8* %13)
store i32 0, i32* %3
br label %23
15: ; preds = %2
%16 = getelementptr inbounds [20 x i8], [20 x i8]* %6, i64 0, i64 0
%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 = getelementptr inbounds [20 x i8], [20 x i8]* %6, i64 0, i64 0
%22 = call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.1, i64 0, i64 0), i8* %21)
store i32 0, i32* %3
br label %23
23: ; preds = %15, %9
%24 = load i32, i32* %3
ret i32 %24
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [16 x i8] c"usage: %s data\0A\00"
@.str.1 = [10 x i8] c"data: %s\0A\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = alloca [20 x i8]
%4 = getelementptr inbounds [20 x i8], [20 x i8]* %3, i64 0, i64 0
%5 = icmp eq i32 %0, 2
br i1 %5, label %10, label %6
6: ; preds = %2
%7 = load i32, i32* @stderr
%8 = load i8*, i8** %1
%9 = tail call i32 @fprintf(i32 %7, i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str, i64 0, i64 0), i8* %8)
br label %15
10: ; preds = %2
%11 = getelementptr inbounds i8*, i8** %1, i64 1
%12 = load i8*, i8** %11
%13 = call i32 @strcpy(i8* %4, i8* %12)
%14 = call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.1, i64 0, i64 0), i8* %4)
br label %15
15: ; preds = %10, %6
ret i32 0
}