#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 atoi(char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, ...);
int lhs(int);
int rhs(int);
int /*<<< orphan*/ stderr;
int main(int argc, char *argv[]) {
  if (argc < 2) {
    fprintf(stderr, "Usage: %s <n> [lhs]\n", argv[0]);
    return 0;
  }
  int s, n = atoi(argv[1]);
  if (argc == 2) {
    s = lhs(n);
  } else {
    s = rhs(n);
  }
  fprintf(stderr, "sum(%d) = %d\n", n, s);
  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    118a <main+0x4a>
mov    0x2e79(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rax
mov    (%rax),%rdx
lea    0xe89(%rip),%rsi
mov    $0x0,%al
call   1040 <fprintf@plt>
movl   $0x0,-0x4(%rbp)
jmp    11e3 <main+0xa3>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1060 <atoi@plt>
mov    %eax,-0x18(%rbp)
cmpl   $0x2,-0x8(%rbp)
jne    11b4 <main+0x74>
mov    -0x18(%rbp),%edi
call   1030 <lhs@plt>
mov    %eax,-0x14(%rbp)
jmp    11bf <main+0x7f>
mov    -0x18(%rbp),%edi
call   1050 <rhs@plt>
mov    %eax,-0x14(%rbp)
mov    0x2e1a(%rip),%rax
mov    (%rax),%edi
mov    -0x18(%rbp),%edx
mov    -0x14(%rbp),%ecx
lea    0xe40(%rip),%rsi
mov    $0x0,%al
call   1040 <fprintf@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %rbx
push   %rax
cmp    $0x1,%edi
jg     1164 <main+0x24>
mov    0x2e91(%rip),%rax
mov    (%rax),%edi
mov    (%rsi),%rdx
lea    0xea5(%rip),%rsi
xor    %eax,%eax
call   1040 <fprintf@plt>
jmp    119f <main+0x5f>
mov    %edi,%ebp
mov    0x8(%rsi),%rdi
call   1060 <atoi@plt>
mov    %eax,%ebx
mov    %eax,%edi
cmp    $0x2,%ebp
jne    117f <main+0x3f>
call   1030 <lhs@plt>
jmp    1184 <main+0x44>
call   1050 <rhs@plt>
mov    0x2e55(%rip),%rcx
mov    (%rcx),%edi
lea    0xe81(%rip),%rsi
mov    %ebx,%edx
mov    %eax,%ecx
xor    %eax,%eax
call   1040 <fprintf@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@stderr = global i32 0
@.str = [21 x i8] c"Usage: %s <n> [lhs]\0A\00"
@.str.1 = [14 x i8] c"sum(%d) = %d\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
%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 slt i32 %8, 2
br i1 %9, label %10, label %16
10: ; preds = %2
%11 = load i32, i32* @stderr
%12 = load i8**, i8*** %5
%13 = getelementptr inbounds i8*, i8** %12, i64 0
%14 = load i8*, i8** %13
%15 = call i32 (i32, i8*, ...) @fprintf(i32 %11, i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str, i64 0, i64 0), i8* %14)
store i32 0, i32* %3
br label %34
16: ; preds = %2
%17 = load i8**, i8*** %5
%18 = getelementptr inbounds i8*, i8** %17, i64 1
%19 = load i8*, i8** %18
%20 = call i32 @atoi(i8* %19)
store i32 %20, i32* %7
%21 = load i32, i32* %4
%22 = icmp eq i32 %21, 2
br i1 %22, label %23, label %26
23: ; preds = %16
%24 = load i32, i32* %7
%25 = call i32 @lhs(i32 %24)
store i32 %25, i32* %6
br label %29
26: ; preds = %16
%27 = load i32, i32* %7
%28 = call i32 @rhs(i32 %27)
store i32 %28, i32* %6
br label %29
29: ; preds = %26, %23
%30 = load i32, i32* @stderr
%31 = load i32, i32* %7
%32 = load i32, i32* %6
%33 = call i32 (i32, i8*, ...) @fprintf(i32 %30, i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0), i32 %31, i32 %32)
store i32 0, i32* %3
br label %34
34: ; preds = %29, %10
%35 = load i32, i32* %3
ret i32 %35
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [21 x i8] c"Usage: %s <n> [lhs]\0A\00"
@.str.1 = [14 x i8] c"sum(%d) = %d\0A\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 (i32, i8*, ...) @fprintf(i32 %5, i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str, i64 0, i64 0), i8* %6)
br label %21
8: ; preds = %2
%9 = getelementptr inbounds i8*, i8** %1, i64 1
%10 = load i8*, i8** %9
%11 = tail call i32 @atoi(i8* %10)
%12 = icmp eq i32 %0, 2
br i1 %12, label %13, label %15
13: ; preds = %8
%14 = tail call i32 @lhs(i32 %11)
br label %17
15: ; preds = %8
%16 = tail call i32 @rhs(i32 %11)
br label %17
17: ; preds = %15, %13
%18 = phi i32 [ %14, %13 ], [ %16, %15 ]
%19 = load i32, i32* @stderr
%20 = tail call i32 (i32, i8*, ...) @fprintf(i32 %19, i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0), i32 %11, i32 %18)
br label %21
21: ; preds = %17, %4
ret i32 0
}