#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 *);
int /*<<< orphan*/ printf(char *, char const *);
int /*<<< orphan*/ stderr;
int main(int argc, const char *argv[]) {
  if (argc != 2) {
    fprintf(stderr, "1 argument is required.\n");
    return 1;
  }
  const char *name = argv[1];
  printf("Hello %s!\n", name);
  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)
je     1161 <main+0x41>
mov    0x2e99(%rip),%rax
mov    (%rax),%edi
lea    0xeb0(%rip),%rsi
call   1040 <fprintf@plt>
movl   $0x1,-0x4(%rbp)
jmp    1184 <main+0x64>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rax
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rsi
lea    0xea1(%rip),%rdi
call   1030 <printf@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
cmp    $0x2,%edi
jne    113a <main+0x1a>
mov    0x8(%rsi),%rsi
lea    0xee8(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret
mov    0x2e9f(%rip),%rax
mov    (%rax),%edi
lea    0xeb6(%rip),%rsi
call   1040 <fprintf@plt>
mov    $0x1,%eax
pop    %rcx
ret

LLVM IR (-O0):
@stderr = global i32 0
@.str = [25 x i8] c"1 argument is required.\0A\00"
@.str.1 = [11 x i8] c"Hello %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 ne i32 %7, 2
br i1 %8, label %9, label %12
9: ; preds = %2
%10 = load i32, i32* @stderr
%11 = call i32 @fprintf(i32 %10, i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str, i64 0, i64 0))
store i32 1, i32* %3
br label %18
12: ; preds = %2
%13 = load i8**, i8*** %5
%14 = getelementptr inbounds i8*, i8** %13, i64 1
%15 = load i8*, i8** %14
store i8* %15, i8** %6
%16 = load i8*, i8** %6
%17 = call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.1, i64 0, i64 0), i8* %16)
store i32 0, i32* %3
br label %18
18: ; preds = %12, %9
%19 = load i32, i32* %3
ret i32 %19
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [25 x i8] c"1 argument is required.\0A\00"
@.str.1 = [11 x i8] c"Hello %s!\0A\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp eq i32 %0, 2
br i1 %3, label %7, label %4
4: ; preds = %2
%5 = load i32, i32* @stderr
%6 = tail call i32 @fprintf(i32 %5, i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str, i64 0, i64 0))
br label %11
7: ; preds = %2
%8 = getelementptr inbounds i8*, i8** %1, i64 1
%9 = load i8*, i8** %8
%10 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.1, i64 0, i64 0), i8* %9)
br label %11
11: ; preds = %7, %4
%12 = phi i32 [ 1, %4 ], [ 0, %7 ]
ret i32 %12
}