#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 */
double calc(char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char *);
int /*<<< orphan*/ printf(char *, double);
int /*<<< orphan*/ stderr;
int main(int argc, char *argv[]) {
  if (argc != 2) {
    fprintf(stderr, "usage: %s <expression>\n", argv[0]);
    return -1;
  }
  printf("calc() returned: %f\n", calc(argv[1]));
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x2,-0x8(%rbp)
je     1178 <main+0x48>
mov    0x2e89(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rax
mov    (%rax),%rdx
lea    0xe99(%rip),%rsi
call   1050 <fprintf@plt>
movl   $0xffffffff,-0x4(%rbp)
jmp    1198 <main+0x68>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1040 <calc@plt>
lea    0xe8c(%rip),%rdi
call   1030 <printf@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
cmp    $0x2,%edi
jne    114f <main+0x1f>
mov    0x8(%rsi),%rdi
call   1040 <calc@plt>
lea    0xed2(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret
mov    0x2e8a(%rip),%rax
mov    (%rax),%edi
mov    (%rsi),%rdx
lea    0xe9e(%rip),%rsi
call   1050 <fprintf@plt>
mov    $0xffffffff,%eax
pop    %rcx
ret

LLVM IR (-O0):
@stderr = global i32 0
@.str = [24 x i8] c"usage: %s <expression>\0A\00"
@.str.1 = [21 x i8] c"calc() returned: %f\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%6 = load i32, i32* %4
%7 = icmp ne i32 %6, 2
br i1 %7, label %8, label %14
8: ; preds = %2
%9 = load i32, i32* @stderr
%10 = load i8**, i8*** %5
%11 = getelementptr inbounds i8*, i8** %10, i64 0
%12 = load i8*, i8** %11
%13 = call i32 @fprintf(i32 %9, i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str, i64 0, i64 0), i8* %12)
store i32 -1, i32* %3
br label %20
14: ; preds = %2
%15 = load i8**, i8*** %5
%16 = getelementptr inbounds i8*, i8** %15, i64 1
%17 = load i8*, i8** %16
%18 = call double @calc(i8* %17)
%19 = call i32 @printf(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.1, i64 0, i64 0), double %18)
store i32 0, i32* %3
br label %20
20: ; preds = %14, %8
%21 = load i32, i32* %3
ret i32 %21
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [24 x i8] c"usage: %s <expression>\0A\00"
@.str.1 = [21 x i8] c"calc() returned: %f\0A\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp eq i32 %0, 2
br i1 %3, label %8, label %4
4: ; preds = %2
%5 = load i32, i32* @stderr
%6 = load i8*, i8** %1
%7 = tail call i32 @fprintf(i32 %5, i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str, i64 0, i64 0), i8* %6)
br label %13
8: ; preds = %2
%9 = getelementptr inbounds i8*, i8** %1, i64 1
%10 = load i8*, i8** %9
%11 = tail call double @calc(i8* %10)
%12 = tail call i32 @printf(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.1, i64 0, i64 0), double %11)
br label %13
13: ; preds = %8, %4
%14 = phi i32 [ -1, %4 ], [ 0, %8 ]
ret i32 %14
}