#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 *);
int main(void) {
  char firstName[50] = "";
  char lastName[50] = "";
  printf("Enter first name:\n");
  scanf("%s", firstName);
  printf("Enter last name:\n");
  scanf("%s", lastName);
  printf("\n");
  printf("Welcome %s %s!\n", firstName, lastName);
  printf("May I call you %s?\n", firstName);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x80,%rsp
movl   $0x0,-0x4(%rbp)
lea    -0x40(%rbp),%rdi
xor    %esi,%esi
mov    $0x32,%edx
call   1040 <memset@plt>
lea    -0x80(%rbp),%rdi
xor    %esi,%esi
mov    $0x32,%edx
call   1040 <memset@plt>
lea    0xe97(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    -0x40(%rbp),%rsi
lea    0xe98(%rip),%rdi
call   1050 <scanf@plt>
lea    0xe8f(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    -0x80(%rbp),%rsi
lea    0xe7a(%rip),%rdi
call   1050 <scanf@plt>
lea    0xe91(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    -0x40(%rbp),%rsi
lea    -0x80(%rbp),%rdx
lea    0xe6d(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    -0x40(%rbp),%rsi
lea    0xe6b(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x80,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %rbx
sub    $0x80,%rsp
xorps  %xmm0,%xmm0
movaps %xmm0,0x60(%rsp)
movaps %xmm0,0x50(%rsp)
movaps %xmm0,0x40(%rsp)
movw   $0x0,0x70(%rsp)
movaps %xmm0,0x20(%rsp)
movaps %xmm0,0x10(%rsp)
movaps %xmm0,(%rsp)
movw   $0x0,0x30(%rsp)
lea    0xea6(%rip),%rdi
call   1040 <puts@plt>
lea    0xe73(%rip),%rbx
lea    0x40(%rsp),%r14
mov    %rbx,%rdi
mov    %r14,%rsi
call   1060 <scanf@plt>
lea    0xe95(%rip),%rdi
call   1040 <puts@plt>
mov    %rsp,%r15
mov    %rbx,%rdi
mov    %r15,%rsi
call   1060 <scanf@plt>
mov    $0xa,%edi
call   1030 <putchar@plt>
lea    0xe3b(%rip),%rdi
mov    %r14,%rsi
mov    %r15,%rdx
xor    %eax,%eax
call   1050 <printf@plt>
lea    0xe37(%rip),%rdi
mov    %r14,%rsi
xor    %eax,%eax
call   1050 <printf@plt>
xor    %eax,%eax
add    $0x80,%rsp
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [19 x i8] c"Enter first name:\0A\00"
@.str.1 = [3 x i8] c"%s\00"
@.str.2 = [18 x i8] c"Enter last name:\0A\00"
@.str.3 = [2 x i8] c"\0A\00"
@.str.4 = [16 x i8] c"Welcome %s %s!\0A\00"
@.str.5 = [20 x i8] c"May I call you %s?\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca [50 x i8]
%3 = alloca [50 x i8]
store i32 0, i32* %1
%4 = bitcast [50 x i8]* %2 to i8*
%5 = bitcast [50 x i8]* %3 to i8*
%6 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str, i64 0, i64 0))
%7 = getelementptr inbounds [50 x i8], [50 x i8]* %2, i64 0, i64 0
%8 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %7)
%9 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str.2, i64 0, i64 0))
%10 = getelementptr inbounds [50 x i8], [50 x i8]* %3, i64 0, i64 0
%11 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %10)
%12 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i64 0, i64 0))
%13 = getelementptr inbounds [50 x i8], [50 x i8]* %2, i64 0, i64 0
%14 = getelementptr inbounds [50 x i8], [50 x i8]* %3, i64 0, i64 0
%15 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.4, i64 0, i64 0), i8* %13, i8* %14)
%16 = getelementptr inbounds [50 x i8], [50 x i8]* %2, i64 0, i64 0
%17 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.5, i64 0, i64 0), i8* %16)
ret i32 0
}

LLVM IR (-O2):
@.str.1 = [3 x i8] c"%s\00"
@.str.4 = [16 x i8] c"Welcome %s %s!\0A\00"
@.str.5 = [20 x i8] c"May I call you %s?\0A\00"
@str = [18 x i8] c"Enter first name:\00"
@str.6 = [17 x i8] c"Enter last name:\00"
define i32 @main() {
%1 = alloca [50 x i8]
%2 = alloca [50 x i8]
%3 = getelementptr inbounds [50 x i8], [50 x i8]* %1, i64 0, i64 0
%4 = getelementptr inbounds [50 x i8], [50 x i8]* %2, i64 0, i64 0
%5 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([18 x i8], [18 x i8]* @str, i64 0, i64 0))
%6 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %3)
%7 = call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([17 x i8], [17 x i8]* @str.6, i64 0, i64 0))
%8 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %4)
%9 = call i32 @putchar(i32 10)
%10 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([16 x i8], [16 x i8]* @.str.4, i64 0, i64 0), i8* %3, i8* %4)
%11 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([20 x i8], [20 x i8]* @.str.5, i64 0, i64 0), i8* %3)
ret i32 0
}