#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*/ exit(int);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char *);
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ stderr;
int strlen(char *);
main(int argc, char *argv[]) {
  char *filename, last, *p;
  if (argc != 2) {
    fprintf(stderr, "usage: %s failename", argv[1]);
    exit(1);
  }
  filename = argv[1];
  p = filename + strlen(filename) - 1;
  last = *p;
  *p = '\0';
  printf("set base=%s\n", filename);
  printf("set last=%c\n", last);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %edi,-0x4(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x2,-0x4(%rbp)
je     1180 <main+0x40>
mov    0x2e80(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdx
lea    0xe8f(%rip),%rsi
call   1050 <fprintf@plt>
mov    $0x1,%edi
call   1060 <exit@plt>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rax
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rax
mov    %rax,-0x30(%rbp)
mov    -0x18(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,%ecx
mov    -0x30(%rbp),%rax
movslq %ecx,%rcx
add    %rcx,%rax
add    $0xffffffffffffffff,%rax
mov    %rax,-0x28(%rbp)
mov    -0x28(%rbp),%rax
mov    (%rax),%al
mov    %al,-0x19(%rbp)
mov    -0x28(%rbp),%rax
movb   $0x0,(%rax)
mov    -0x18(%rbp),%rsi
lea    0xe48(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
movsbl -0x19(%rbp),%esi
lea    0xe43(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %rbx
push   %rax
cmp    $0x2,%edi
jne    118a <main+0x4a>
mov    0x8(%rsi),%rbx
mov    %rbx,%rdi
call   1030 <strlen@plt>
cltq
movsbl -0x1(%rbx,%rax,1),%ebp
movb   $0x0,-0x1(%rbx,%rax,1)
lea    0xead(%rip),%rdi
mov    %rbx,%rsi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xea9(%rip),%rdi
mov    %ebp,%esi
xor    %eax,%eax
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret
mov    0x2e4f(%rip),%rax
mov    (%rax),%edi
mov    0x8(%rsi),%rdx
lea    0xe62(%rip),%rsi
call   1050 <fprintf@plt>
mov    $0x1,%edi
call   1060 <exit@plt>

LLVM IR (-O0):
@stderr = global i32 0
@.str = [20 x i8] c"usage: %s failename\00"
@.str.1 = [13 x i8] c"set base=%s\0A\00"
@.str.2 = [13 x i8] c"set last=%c\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i8**
%5 = alloca i8*
%6 = alloca i8
%7 = alloca i8*
store i32 %0, i32* %3
store i8** %1, i8*** %4
%8 = load i32, i32* %3
%9 = icmp ne i32 %8, 2
br i1 %9, label %10, label %17
10: ; preds = %2
%11 = load i32, i32* @stderr
%12 = load i8**, i8*** %4
%13 = getelementptr inbounds i8*, i8** %12, i64 1
%14 = load i8*, i8** %13
%15 = call i32 @fprintf(i32 %11, i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str, i64 0, i64 0), i8* %14)
%16 = call i32 @exit(i32 1)
unreachable
17: ; preds = %2
%18 = load i8**, i8*** %4
%19 = getelementptr inbounds i8*, i8** %18, i64 1
%20 = load i8*, i8** %19
store i8* %20, i8** %5
%21 = load i8*, i8** %5
%22 = load i8*, i8** %5
%23 = call i32 @strlen(i8* %22)
%24 = sext i32 %23 to i64
%25 = getelementptr inbounds i8, i8* %21, i64 %24
%26 = getelementptr inbounds i8, i8* %25, i64 -1
store i8* %26, i8** %7
%27 = load i8*, i8** %7
%28 = load i8, i8* %27
store i8 %28, i8* %6
%29 = load i8*, i8** %7
store i8 0, i8* %29
%30 = load i8*, i8** %5
%31 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.1, i64 0, i64 0), i8* %30)
%32 = load i8, i8* %6
%33 = sext i8 %32 to i32
%34 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), i32 %33)
ret i32 0
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [20 x i8] c"usage: %s failename\00"
@.str.1 = [13 x i8] c"set base=%s\0A\00"
@.str.2 = [13 x i8] c"set last=%c\0A\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp eq i32 %0, 2
br i1 %3, label %10, label %4
4: ; preds = %2
%5 = load i32, i32* @stderr
%6 = getelementptr inbounds i8*, i8** %1, i64 1
%7 = load i8*, i8** %6
%8 = tail call i32 @fprintf(i32 %5, i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str, i64 0, i64 0), i8* %7)
%9 = tail call i32 @exit(i32 1)
unreachable
10: ; preds = %2
%11 = getelementptr inbounds i8*, i8** %1, i64 1
%12 = load i8*, i8** %11
%13 = tail call i32 @strlen(i8* %12)
%14 = sext i32 %13 to i64
%15 = getelementptr inbounds i8, i8* %12, i64 %14
%16 = getelementptr inbounds i8, i8* %15, i64 -1
%17 = load i8, i8* %16
store i8 0, i8* %16
%18 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str.1, i64 0, i64 0), i8* %12)
%19 = sext i8 %17 to i32
%20 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), i32 %19)
ret i32 0
}