#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 strlen(char *const);
int /*<<< orphan*/ usage();
void check_flags(int argc, char *const *argv) {
  int arg;
  for (arg = 1; arg < argc; arg++) {
    if (argv[arg][0] == '-' && strlen(argv[arg]) > 2)
      usage();
  }
}


x86 assembly (clang, -O0):
<check_flags>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %edi,-0x4(%rbp)
mov    %rsi,-0x10(%rbp)
movl   $0x1,-0x14(%rbp)
mov    -0x14(%rbp),%eax
cmp    -0x4(%rbp),%eax
jge    118e <check_flags+0x6e>
mov    -0x10(%rbp),%rax
movslq -0x14(%rbp),%rcx
mov    (%rax,%rcx,8),%rax
movsbl (%rax),%eax
cmp    $0x2d,%eax
jne    117b <check_flags+0x5b>
mov    -0x10(%rbp),%rax
movslq -0x14(%rbp),%rcx
mov    (%rax,%rcx,8),%rdi
call   1030 <strlen@plt>
cmp    $0x2,%eax
jle    117b <check_flags+0x5b>
mov    $0x0,%al
call   1040 <usage@plt>
jmp    1180 <check_flags+0x60>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    1136 <check_flags+0x16>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<check_flags>:
push   %r15
push   %r14
push   %rbx
cmp    $0x2,%edi
jl     1165 <check_flags+0x45>
mov    %rsi,%r14
mov    %edi,%r15d
mov    $0x1,%ebx
jmp    1149 <check_flags+0x29>
nopw   0x0(%rax,%rax,1)
add    $0x1,%rbx
cmp    %rbx,%r15
je     1165 <check_flags+0x45>
mov    (%r14,%rbx,8),%rdi
cmpb   $0x2d,(%rdi)
jne    1140 <check_flags+0x20>
call   1030 <strlen@plt>
cmp    $0x3,%eax
jl     1140 <check_flags+0x20>
xor    %eax,%eax
call   1040 <usage@plt>
jmp    1140 <check_flags+0x20>
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
define void @check_flags(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i8**
%5 = alloca i32
store i32 %0, i32* %3
store i8** %1, i8*** %4
store i32 1, i32* %5
br label %6
6: ; preds = %31, %2
%7 = load i32, i32* %5
%8 = load i32, i32* %3
%9 = icmp slt i32 %7, %8
br i1 %9, label %10, label %34
10: ; preds = %6
%11 = load i8**, i8*** %4
%12 = load i32, i32* %5
%13 = sext i32 %12 to i64
%14 = getelementptr inbounds i8*, i8** %11, i64 %13
%15 = load i8*, i8** %14
%16 = getelementptr inbounds i8, i8* %15, i64 0
%17 = load i8, i8* %16
%18 = sext i8 %17 to i32
%19 = icmp eq i32 %18, 45
br i1 %19, label %20, label %30
20: ; preds = %10
%21 = load i8**, i8*** %4
%22 = load i32, i32* %5
%23 = sext i32 %22 to i64
%24 = getelementptr inbounds i8*, i8** %21, i64 %23
%25 = load i8*, i8** %24
%26 = call i32 @strlen(i8* %25)
%27 = icmp sgt i32 %26, 2
br i1 %27, label %28, label %30
28: ; preds = %20
%29 = call i32 (...) @usage()
br label %30
30: ; preds = %28, %20, %10
br label %31
31: ; preds = %30
%32 = load i32, i32* %5
%33 = add nsw i32 %32, 1
store i32 %33, i32* %5
br label %6
34: ; preds = %6
ret void
}

LLVM IR (-O2):
define void @check_flags(i32 %0, i8** nocapture %1) {
%3 = icmp sgt i32 %0, 1
br i1 %3, label %4, label %20
4: ; preds = %2
%5 = zext i32 %0 to i64
br label %6
6: ; preds = %4, %17
%7 = phi i64 [ 1, %4 ], [ %18, %17 ]
%8 = getelementptr inbounds i8*, i8** %1, i64 %7
%9 = load i8*, i8** %8
%10 = load i8, i8* %9
%11 = icmp eq i8 %10, 45
br i1 %11, label %12, label %17
12: ; preds = %6
%13 = tail call i32 @strlen(i8* %9)
%14 = icmp sgt i32 %13, 2
br i1 %14, label %15, label %17
15: ; preds = %12
%16 = tail call i32 (...) @usage()
br label %17
17: ; preds = %6, %12, %15
%18 = add nuw nsw i64 %7, 1
%19 = icmp eq i64 %18, %5
br i1 %19, label %20, label %6
20: ; preds = %17, %2
ret void
}