#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*/ O_RDONLY;
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char *);
int open(char *, int /*<<< orphan*/);
int /*<<< orphan*/ perror(char *);
int /*<<< orphan*/ print_blocks(int);
int /*<<< orphan*/ stderr;
int main(int argc, char *argv[]) {
  int fd;
  if (argc < 2) {
    fprintf(stderr, "usage: %s <file>\n", argv[0]);
  }
  fd = open(argv[1], O_RDONLY);
  if (fd < 0) {
    perror("open");
    return 1;
  }
  print_blocks(fd);
  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+0x3c>
mov    0x2e71(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rax
mov    (%rax),%rdx
lea    0xe89(%rip),%rsi
call   1040 <fprintf@plt>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
mov    0x2e5d(%rip),%rax
mov    (%rax),%esi
call   1050 <open@plt>
mov    %eax,-0x14(%rbp)
cmpl   $0x0,-0x14(%rbp)
jge    11b7 <main+0x77>
lea    0xe6c(%rip),%rdi
call   1060 <perror@plt>
movl   $0x1,-0x4(%rbp)
jmp    11c6 <main+0x86>
mov    -0x14(%rbp),%edi
call   1030 <print_blocks@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
mov    %rsi,%rbx
cmp    $0x1,%edi
jg     1161 <main+0x21>
mov    0x2e88(%rip),%rax
mov    (%rax),%edi
mov    (%rbx),%rdx
lea    0xea4(%rip),%rsi
call   1040 <fprintf@plt>
mov    0x8(%rbx),%rdi
mov    0x2e7c(%rip),%rax
mov    (%rax),%esi
call   1050 <open@plt>
test   %eax,%eax
js     1182 <main+0x42>
mov    %eax,%edi
call   1030 <print_blocks@plt>
xor    %eax,%eax
pop    %rbx
ret
lea    0xe89(%rip),%rdi
call   1060 <perror@plt>
mov    $0x1,%eax
pop    %rbx
ret

LLVM IR (-O0):
@stderr = global i32 0
@.str = [18 x i8] c"usage: %s <file>\0A\00"
@O_RDONLY = global i32 0
@.str.1 = [5 x i8] c"open\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
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 %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 ([18 x i8], [18 x i8]* @.str, i64 0, i64 0), i8* %13)
br label %15
15: ; preds = %9, %2
%16 = load i8**, i8*** %5
%17 = getelementptr inbounds i8*, i8** %16, i64 1
%18 = load i8*, i8** %17
%19 = load i32, i32* @O_RDONLY
%20 = call i32 @open(i8* %18, i32 %19)
store i32 %20, i32* %6
%21 = load i32, i32* %6
%22 = icmp slt i32 %21, 0
br i1 %22, label %23, label %25
23: ; preds = %15
%24 = call i32 @perror(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0))
store i32 1, i32* %3
br label %28
25: ; preds = %15
%26 = load i32, i32* %6
%27 = call i32 @print_blocks(i32 %26)
store i32 0, i32* %3
br label %28
28: ; preds = %25, %23
%29 = load i32, i32* %3
ret i32 %29
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [18 x i8] c"usage: %s <file>\0A\00"
@O_RDONLY = global i32 0
@.str.1 = [5 x i8] c"open\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp slt i32 %0, 2
br i1 %3, label %4, label %8
4: ; preds = %2
%5 = load i32, i32* @stderr
%6 = load i8*, i8** %1
%7 = tail call i32 @fprintf(i32 %5, i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str, i64 0, i64 0), i8* %6)
br label %8
8: ; preds = %4, %2
%9 = getelementptr inbounds i8*, i8** %1, i64 1
%10 = load i8*, i8** %9
%11 = load i32, i32* @O_RDONLY
%12 = tail call i32 @open(i8* %10, i32 %11)
%13 = icmp slt i32 %12, 0
br i1 %13, label %14, label %16
14: ; preds = %8
%15 = tail call i32 @perror(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0))
br label %18
16: ; preds = %8
%17 = tail call i32 @print_blocks(i32 %12)
br label %18
18: ; preds = %16, %14
%19 = phi i32 [ 1, %14 ], [ 0, %16 ]
ret i32 %19
}