#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 scan(char *, int /*<<< orphan*/);
int /*<<< orphan*/ stderr;
int /*<<< orphan*/ strlen(char *);
int main(int argc, char **argv) {
  if (argc > 1) {
    return scan(argv[1], strlen(argv[1]));
  } else {
    fprintf(stderr, "%s <expr>\n", argv[0]);
    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   $0x1,-0x8(%rbp)
jle    117c <main+0x4c>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rax
mov    %rax,-0x18(%rbp)
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1030 <strlen@plt>
mov    -0x18(%rbp),%rdi
mov    %eax,%esi
call   1050 <scan@plt>
mov    %eax,-0x4(%rbp)
jmp    119f <main+0x6f>
mov    0x2e5d(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rax
mov    (%rax),%rdx
lea    0xe6d(%rip),%rsi
call   1040 <fprintf@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
cmp    $0x2,%edi
jl     114d <main+0x1d>
mov    0x8(%rsi),%rbx
mov    %rbx,%rdi
call   1030 <strlen@plt>
mov    %rbx,%rdi
mov    %eax,%esi
pop    %rbx
jmp    1050 <scan@plt>
mov    0x2e8c(%rip),%rax
mov    (%rax),%edi
mov    (%rsi),%rdx
lea    0xea0(%rip),%rsi
call   1040 <fprintf@plt>
xor    %eax,%eax
pop    %rbx
ret

LLVM IR (-O0):
@stderr = global i32 0
@.str = [11 x i8] c"%s <expr>\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%6 = load i32, i32* %4
%7 = icmp sgt i32 %6, 1
br i1 %7, label %8, label %17
8: ; preds = %2
%9 = load i8**, i8*** %5
%10 = getelementptr inbounds i8*, i8** %9, i64 1
%11 = load i8*, i8** %10
%12 = load i8**, i8*** %5
%13 = getelementptr inbounds i8*, i8** %12, i64 1
%14 = load i8*, i8** %13
%15 = call i32 @strlen(i8* %14)
%16 = call i32 @scan(i8* %11, i32 %15)
store i32 %16, i32* %3
br label %23
17: ; preds = %2
%18 = load i32, i32* @stderr
%19 = load i8**, i8*** %5
%20 = getelementptr inbounds i8*, i8** %19, i64 0
%21 = load i8*, i8** %20
%22 = call i32 @fprintf(i32 %18, i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i8* %21)
store i32 0, i32* %3
br label %23
23: ; preds = %17, %8
%24 = load i32, i32* %3
ret i32 %24
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [11 x i8] c"%s <expr>\0A\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp sgt i32 %0, 1
br i1 %3, label %4, label %9
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 i32 @scan(i8* %6, i32 %7)
br label %13
9: ; preds = %2
%10 = load i32, i32* @stderr
%11 = load i8*, i8** %1
%12 = tail call i32 @fprintf(i32 %10, i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i8* %11)
br label %13
13: ; preds = %9, %4
%14 = phi i32 [ %8, %4 ], [ 0, %9 ]
ret i32 %14
}