#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*/ printf(char *);
int /*<<< orphan*/ scanf(char *, char *);
char Get_command(void) {
  char c;
  printf("Please enter a command:\n");
  printf("1.     i = insert. ");
  printf("2.     p = print. ");
  printf("3.     h = print head. ");
  printf("4.     t = print tail. ");
  printf("5.     s = search. ");
  printf("6.     d = delete. ");
  printf("7.     f = free list. ");
  printf("9.     q = quit. ");
  scanf(" %c", &c);
  return c;
}


x86 assembly (clang, -O0):
<Get_command>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
lea    0xed1(%rip),%rdi
call   1030 <printf@plt>
lea    0xede(%rip),%rdi
call   1030 <printf@plt>
lea    0xee6(%rip),%rdi
call   1030 <printf@plt>
lea    0xeed(%rip),%rdi
call   1030 <printf@plt>
lea    0xef9(%rip),%rdi
call   1030 <printf@plt>
lea    0xf05(%rip),%rdi
call   1030 <printf@plt>
lea    0xf0d(%rip),%rdi
call   1030 <printf@plt>
lea    0xf15(%rip),%rdi
call   1030 <printf@plt>
lea    0xf20(%rip),%rdi
call   1030 <printf@plt>
lea    0xf26(%rip),%rdi
lea    -0x1(%rbp),%rsi
call   1040 <scanf@plt>
movsbl -0x1(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<Get_command>:
push   %rax
lea    0xf74(%rip),%rdi
call   1030 <puts@plt>
lea    0xebc(%rip),%rdi
call   1040 <printf@plt>
lea    0xec4(%rip),%rdi
call   1040 <printf@plt>
lea    0xecb(%rip),%rdi
call   1040 <printf@plt>
lea    0xed7(%rip),%rdi
call   1040 <printf@plt>
lea    0xee3(%rip),%rdi
call   1040 <printf@plt>
lea    0xeeb(%rip),%rdi
call   1040 <printf@plt>
lea    0xef3(%rip),%rdi
call   1040 <printf@plt>
lea    0xefe(%rip),%rdi
call   1040 <printf@plt>
lea    0xf04(%rip),%rdi
lea    0x7(%rsp),%rsi
call   1050 <scanf@plt>
mov    0x7(%rsp),%al
pop    %rcx
ret

LLVM IR (-O0):
@.str = [25 x i8] c"Please enter a command:\0A\00"
@.str.1 = [20 x i8] c"1. i = insert. \00"
@.str.2 = [19 x i8] c"2. p = print. \00"
@.str.3 = [24 x i8] c"3. h = print head. \00"
@.str.4 = [24 x i8] c"4. t = print tail. \00"
@.str.5 = [20 x i8] c"5. s = search. \00"
@.str.6 = [20 x i8] c"6. d = delete. \00"
@.str.7 = [23 x i8] c"7. f = free list. \00"
@.str.8 = [18 x i8] c"9. q = quit. \00"
@.str.9 = [4 x i8] c" %c\00"
define signext i8 @Get_command() {
%1 = alloca i8
%2 = call i32 @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str, i64 0, i64 0))
%3 = call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.1, i64 0, i64 0))
%4 = call i32 @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.2, i64 0, i64 0))
%5 = call i32 @printf(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.3, i64 0, i64 0))
%6 = call i32 @printf(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.4, i64 0, i64 0))
%7 = call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.5, i64 0, i64 0))
%8 = call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.6, i64 0, i64 0))
%9 = call i32 @printf(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.7, i64 0, i64 0))
%10 = call i32 @printf(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str.8, i64 0, i64 0))
%11 = call i32 @scanf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.9, i64 0, i64 0), i8* %1)
%12 = load i8, i8* %1
ret i8 %12
}

LLVM IR (-O2):
@.str.1 = [20 x i8] c"1. i = insert. \00"
@.str.2 = [19 x i8] c"2. p = print. \00"
@.str.3 = [24 x i8] c"3. h = print head. \00"
@.str.4 = [24 x i8] c"4. t = print tail. \00"
@.str.5 = [20 x i8] c"5. s = search. \00"
@.str.6 = [20 x i8] c"6. d = delete. \00"
@.str.7 = [23 x i8] c"7. f = free list. \00"
@.str.8 = [18 x i8] c"9. q = quit. \00"
@.str.9 = [4 x i8] c" %c\00"
@str = [24 x i8] c"Please enter a command:\00"
define signext i8 @Get_command() {
%1 = alloca i8
%2 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([24 x i8], [24 x i8]* @str, i64 0, i64 0))
%3 = tail call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([20 x i8], [20 x i8]* @.str.1, i64 0, i64 0))
%4 = tail call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([19 x i8], [19 x i8]* @.str.2, i64 0, i64 0))
%5 = tail call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([24 x i8], [24 x i8]* @.str.3, i64 0, i64 0))
%6 = tail call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([24 x i8], [24 x i8]* @.str.4, i64 0, i64 0))
%7 = tail call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([20 x i8], [20 x i8]* @.str.5, i64 0, i64 0))
%8 = tail call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([20 x i8], [20 x i8]* @.str.6, i64 0, i64 0))
%9 = tail call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([23 x i8], [23 x i8]* @.str.7, i64 0, i64 0))
%10 = tail call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([18 x i8], [18 x i8]* @.str.8, i64 0, i64 0))
%11 = call i32 @scanf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.9, i64 0, i64 0), i8* %1)
%12 = load i8, i8* %1
ret i8 %12
}