#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*/ errno;
int /*<<< orphan*/ printf(char *, char *, ...);
int /*<<< orphan*/ strerror(int /*<<< orphan*/);
unsigned long long strtoull(char *, int /*<<< orphan*/ *, int /*<<< orphan*/);
int truncate64(char *, unsigned long long);
int main(int argc, char **argv) {
  unsigned long long off;
  int err;
  if (argc != 3) {
    printf("usage %s file bytes\n", argv[0]);
    return 1;
  }
  off = strtoull(argv[2], NULL, 0);
  err = truncate64(argv[1], off);
  if (err)
    printf("Error truncating %s to %lld: %s\n", argv[1], off, strerror(errno));
  return err;
}


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   $0x3,-0x8(%rbp)
je     1181 <main+0x41>
mov    -0x10(%rbp),%rax
mov    (%rax),%rsi
lea    0xe92(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x1,-0x4(%rbp)
jmp    11f6 <main+0xb6>
mov    -0x10(%rbp),%rax
mov    0x10(%rax),%rdi
xor    %eax,%eax
mov    %eax,%esi
xor    %edx,%edx
call   1040 <strtoull@plt>
mov    %rax,-0x18(%rbp)
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
mov    -0x18(%rbp),%rsi
call   1050 <truncate64@plt>
mov    %eax,-0x1c(%rbp)
cmpl   $0x0,-0x1c(%rbp)
je     11f0 <main+0xb0>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rax
mov    %rax,-0x30(%rbp)
mov    -0x18(%rbp),%rax
mov    %rax,-0x28(%rbp)
mov    0x2e0f(%rip),%rax
mov    (%rax),%edi
call   1060 <strerror@plt>
mov    -0x30(%rbp),%rsi
mov    -0x28(%rbp),%rdx
mov    %eax,%ecx
lea    0xe2c(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x1c(%rbp),%eax
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %rbx
push   %rax
mov    %rsi,%rbx
cmp    $0x3,%edi
jne    11a1 <main+0x61>
mov    0x10(%rbx),%rdi
xor    %ebp,%ebp
xor    %esi,%esi
xor    %edx,%edx
call   1040 <strtoull@plt>
mov    %rax,%r14
mov    0x8(%rbx),%rdi
mov    %rax,%rsi
call   1050 <truncate64@plt>
test   %eax,%eax
je     11b7 <main+0x77>
mov    %eax,%r15d
mov    0x8(%rbx),%rbx
mov    0x2e61(%rip),%rax
mov    (%rax),%edi
call   1060 <strerror@plt>
lea    0xe88(%rip),%rdi
mov    %rbx,%rsi
mov    %r14,%rdx
mov    %eax,%ecx
xor    %eax,%eax
call   1030 <printf@plt>
mov    %r15d,%ebp
jmp    11b7 <main+0x77>
mov    (%rbx),%rsi
lea    0xe55(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
mov    $0x1,%ebp
mov    %ebp,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@.str = [21 x i8] c"usage %s file bytes\0A\00"
@.str.1 = [33 x i8] c"Error truncating %s to %lld: %s\0A\00"
@errno = global i32 0
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i64
%7 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%8 = load i32, i32* %4
%9 = icmp ne i32 %8, 3
br i1 %9, label %10, label %15
10: ; preds = %2
%11 = load i8**, i8*** %5
%12 = getelementptr inbounds i8*, i8** %11, i64 0
%13 = load i8*, i8** %12
%14 = call i32 (i8*, i8*, ...) @printf(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str, i64 0, i64 0), i8* %13)
store i32 1, i32* %3
br label %37
15: ; preds = %2
%16 = load i8**, i8*** %5
%17 = getelementptr inbounds i8*, i8** %16, i64 2
%18 = load i8*, i8** %17
%19 = call i64 @strtoull(i8* %18, i32* null, i32 0)
store i64 %19, i64* %6
%20 = load i8**, i8*** %5
%21 = getelementptr inbounds i8*, i8** %20, i64 1
%22 = load i8*, i8** %21
%23 = load i64, i64* %6
%24 = call i32 @truncate64(i8* %22, i64 %23)
store i32 %24, i32* %7
%25 = load i32, i32* %7
%26 = icmp ne i32 %25, 0
br i1 %26, label %27, label %35
27: ; preds = %15
%28 = load i8**, i8*** %5
%29 = getelementptr inbounds i8*, i8** %28, i64 1
%30 = load i8*, i8** %29
%31 = load i64, i64* %6
%32 = load i32, i32* @errno
%33 = call i32 @strerror(i32 %32)
%34 = call i32 (i8*, i8*, ...) @printf(i8* getelementptr inbounds ([33 x i8], [33 x i8]* @.str.1, i64 0, i64 0), i8* %30, i64 %31, i32 %33)
br label %35
35: ; preds = %27, %15
%36 = load i32, i32* %7
store i32 %36, i32* %3
br label %37
37: ; preds = %35, %10
%38 = load i32, i32* %3
ret i32 %38
}

LLVM IR (-O2):
@.str = [21 x i8] c"usage %s file bytes\0A\00"
@.str.1 = [33 x i8] c"Error truncating %s to %lld: %s\0A\00"
@errno = global i32 0
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp eq i32 %0, 3
br i1 %3, label %7, label %4
4: ; preds = %2
%5 = load i8*, i8** %1
%6 = tail call i32 (i8*, i8*, ...) @printf(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str, i64 0, i64 0), i8* %5)
br label %20
7: ; preds = %2
%8 = getelementptr inbounds i8*, i8** %1, i64 2
%9 = load i8*, i8** %8
%10 = tail call i64 @strtoull(i8* nocapture %9, i32* null, i32 0)
%11 = getelementptr inbounds i8*, i8** %1, i64 1
%12 = load i8*, i8** %11
%13 = tail call i32 @truncate64(i8* %12, i64 %10)
%14 = icmp eq i32 %13, 0
br i1 %14, label %20, label %15
15: ; preds = %7
%16 = load i8*, i8** %11
%17 = load i32, i32* @errno
%18 = tail call i32 @strerror(i32 %17)
%19 = tail call i32 (i8*, i8*, ...) @printf(i8* getelementptr inbounds ([33 x i8], [33 x i8]* @.str.1, i64 0, i64 0), i8* %16, i64 %10, i32 %18)
br label %20
20: ; preds = %7, %15, %4
%21 = phi i32 [ 1, %4 ], [ %13, %15 ], [ 0, %7 ]
ret i32 %21
}