#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 UserMenu(char *opt) {
  char buffer[100];
  printf("1) Exit\n");
  printf("2) Initialize all matrices\n");
  printf("3) Add two matrices\n");
  printf("4) Multiply two matrices\n");
  printf("5) Print all matrices\n");
  printf("Enter selection: ");
  scanf("%s", buffer);
  *opt = buffer[0];
  return buffer[0];
}


x86 assembly (clang, -O0):
<UserMenu>:
push   %rbp
mov    %rsp,%rbp
sub    $0x70,%rsp
mov    %rdi,-0x8(%rbp)
lea    0xecd(%rip),%rdi
call   1030 <printf@plt>
lea    0xeca(%rip),%rdi
call   1030 <printf@plt>
lea    0xeda(%rip),%rdi
call   1030 <printf@plt>
lea    0xee3(%rip),%rdi
call   1030 <printf@plt>
lea    0xef1(%rip),%rdi
call   1030 <printf@plt>
lea    0xefc(%rip),%rdi
call   1030 <printf@plt>
lea    -0x70(%rbp),%rsi
lea    0xefe(%rip),%rdi
call   1040 <scanf@plt>
mov    -0x70(%rbp),%cl
mov    -0x8(%rbp),%rax
mov    %cl,(%rax)
movsbl -0x70(%rbp),%eax
add    $0x70,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<UserMenu>:
push   %rbx
sub    $0x70,%rsp
mov    %rdi,%rbx
lea    0xed6(%rip),%rdi
call   1030 <puts@plt>
lea    0xed2(%rip),%rdi
call   1030 <puts@plt>
lea    0xee1(%rip),%rdi
call   1030 <puts@plt>
lea    0xee9(%rip),%rdi
call   1030 <puts@plt>
lea    0xef6(%rip),%rdi
call   1030 <puts@plt>
lea    0xe85(%rip),%rdi
call   1040 <printf@plt>
lea    0xe8b(%rip),%rdi
mov    %rsp,%rsi
call   1050 <scanf@plt>
mov    (%rsp),%al
mov    %al,(%rbx)
add    $0x70,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [9 x i8] c"1) Exit\0A\00"
@.str.1 = [28 x i8] c"2) Initialize all matrices\0A\00"
@.str.2 = [21 x i8] c"3) Add two matrices\0A\00"
@.str.3 = [26 x i8] c"4) Multiply two matrices\0A\00"
@.str.4 = [23 x i8] c"5) Print all matrices\0A\00"
@.str.5 = [18 x i8] c"Enter selection: \00"
@.str.6 = [3 x i8] c"%s\00"
define signext i8 @UserMenu(i8* %0) {
%2 = alloca i8*
%3 = alloca [100 x i8]
store i8* %0, i8** %2
%4 = call i32 @printf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0))
%5 = call i32 @printf(i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str.1, i64 0, i64 0))
%6 = call i32 @printf(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.2, i64 0, i64 0))
%7 = call i32 @printf(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.3, i64 0, i64 0))
%8 = call i32 @printf(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.4, i64 0, i64 0))
%9 = call i32 @printf(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str.5, i64 0, i64 0))
%10 = getelementptr inbounds [100 x i8], [100 x i8]* %3, i64 0, i64 0
%11 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.6, i64 0, i64 0), i8* %10)
%12 = getelementptr inbounds [100 x i8], [100 x i8]* %3, i64 0, i64 0
%13 = load i8, i8* %12
%14 = load i8*, i8** %2
store i8 %13, i8* %14
%15 = getelementptr inbounds [100 x i8], [100 x i8]* %3, i64 0, i64 0
%16 = load i8, i8* %15
ret i8 %16
}

LLVM IR (-O2):
@.str.5 = [18 x i8] c"Enter selection: \00"
@.str.6 = [3 x i8] c"%s\00"
@str = [8 x i8] c"1) Exit\00"
@str.7 = [27 x i8] c"2) Initialize all matrices\00"
@str.8 = [20 x i8] c"3) Add two matrices\00"
@str.9 = [25 x i8] c"4) Multiply two matrices\00"
@str.10 = [22 x i8] c"5) Print all matrices\00"
define signext i8 @UserMenu(i8* nocapture writeonly %0) {
%2 = alloca [100 x i8]
%3 = getelementptr inbounds [100 x i8], [100 x i8]* %2, i64 0, i64 0
%4 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @str, i64 0, i64 0))
%5 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([27 x i8], [27 x i8]* @str.7, i64 0, i64 0))
%6 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([20 x i8], [20 x i8]* @str.8, i64 0, i64 0))
%7 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([25 x i8], [25 x i8]* @str.9, i64 0, i64 0))
%8 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([22 x i8], [22 x i8]* @str.10, i64 0, i64 0))
%9 = tail call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([18 x i8], [18 x i8]* @.str.5, i64 0, i64 0))
%10 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.6, i64 0, i64 0), i8* %3)
%11 = load i8, i8* %3
store i8 %11, i8* %0
ret i8 %11
}