#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 *, ...);
int main(void) {
  int cmd;
  float balance = 0.0f, credit, debit;
  printf("*** ACME checkbook-balancing program ***\n");
  printf("Commands: 0=clear, 1=credit, 2=debit, ");
  printf("3=balance, 4=exit\n\n");
  for (;;) {
    printf("Enter command: ");
    scanf("%d", &cmd);
    switch (cmd) {
    case 0:
      balance = 0.0f;
      break;
    case 1:
      printf("Enter amount of credit: ");
      scanf("%f", &credit);
      balance += credit;
      break;
    case 2:
      printf("Enter amount of debit: ");
      scanf("%f", &debit);
      balance -= debit;
      break;
    case 3:
      printf("Current balance: $%.2f\n", balance);
      break;
    case 4:
      return 0;
    default:
      printf("Commands: 0=clear, 1=credit, 2=debit, ");
      printf("3=balance, 4=exit\n\n");
      break;
    }
  }
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
movl   $0x0,-0x4(%rbp)
xorps  %xmm0,%xmm0
movss  %xmm0,-0xc(%rbp)
lea    0xed6(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xef2(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xf0b(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xf11(%rip),%rdi
xor    %eax,%eax
mov    %al,-0x21(%rbp)
call   1030 <printf@plt>
mov    -0x21(%rbp),%al
lea    0xf0d(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
mov    -0x8(%rbp),%eax
mov    %rax,-0x20(%rbp)
sub    $0x4,%rax
ja     1247 <main+0x127>
mov    -0x20(%rbp),%rax
lea    0xe5f(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
xorps  %xmm0,%xmm0
movss  %xmm0,-0xc(%rbp)
jmp    1263 <main+0x143>
lea    0xece(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xed9(%rip),%rdi
lea    -0x10(%rbp),%rsi
mov    $0x0,%al
call   1040 <scanf@plt>
movss  -0x10(%rbp),%xmm0
addss  -0xc(%rbp),%xmm0
movss  %xmm0,-0xc(%rbp)
jmp    1263 <main+0x143>
lea    0xeb6(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xea5(%rip),%rdi
lea    -0x14(%rbp),%rsi
mov    $0x0,%al
call   1040 <scanf@plt>
movss  -0x14(%rbp),%xmm1
movss  -0xc(%rbp),%xmm0
subss  %xmm1,%xmm0
movss  %xmm0,-0xc(%rbp)
jmp    1263 <main+0x143>
movss  -0xc(%rbp),%xmm0
cvtss2sd %xmm0,%xmm0
lea    0xe8d(%rip),%rdi
mov    $0x1,%al
call   1030 <printf@plt>
jmp    1263 <main+0x143>
xor    %eax,%eax
add    $0x30,%rsp
pop    %rbp
ret
lea    0xdf0(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xe09(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
jmp    1161 <main+0x41>

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
sub    $0x18,%rsp
lea    0xf55(%rip),%rdi
call   1030 <puts@plt>
lea    0xec3(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xf64(%rip),%r15
mov    %r15,%rdi
call   1030 <puts@plt>
xorps  %xmm0,%xmm0
lea    0xeca(%rip),%r12
lea    0xed3(%rip),%r13
lea    0xc(%rsp),%rbx
lea    0xe7c(%rip),%r14
lea    0xef7(%rip),%rbp
movss  %xmm0,(%rsp)
cvtss2sd %xmm0,%xmm0
movsd  %xmm0,0x10(%rsp)
jmp    11b6 <main+0x86>
nopl   0x0(%rax)
lea    0xe6d(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %r15,%rdi
call   1030 <puts@plt>
mov    %r12,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %r13,%rdi
mov    %rbx,%rsi
xor    %eax,%eax
call   1050 <scanf@plt>
mov    0xc(%rsp),%eax
cmp    $0x4,%rax
ja     11a0 <main+0x70>
movslq (%r14,%rax,4),%rax
add    %r14,%rax
jmp    *%rax
mov    %rbp,%rdi
movsd  0x10(%rsp),%xmm0
mov    $0x1,%al
call   1040 <printf@plt>
jmp    11b6 <main+0x86>
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax)
xorps  %xmm0,%xmm0
jmp    118b <main+0x5b>
cs nopw 0x0(%rax,%rax,1)
nop
lea    0xe37(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xe42(%rip),%rdi
lea    0x8(%rsp),%rsi
xor    %eax,%eax
call   1050 <scanf@plt>
movss  (%rsp),%xmm0
addss  0x8(%rsp),%xmm0
jmp    118b <main+0x5b>
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax,%rax,1)
lea    0xe13(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xe02(%rip),%rdi
lea    0x4(%rsp),%rsi
xor    %eax,%eax
call   1050 <scanf@plt>
movss  (%rsp),%xmm0
subss  0x4(%rsp),%xmm0
jmp    118b <main+0x5b>
xor    %eax,%eax
add    $0x18,%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@.str = [42 x i8] c"*** ACME checkbook-balancing program ***\0A\00"
@.str.1 = [39 x i8] c"Commands: 0=clear, 1=credit, 2=debit, \00"
@.str.2 = [20 x i8] c"3=balance, 4=exit\0A\0A\00"
@.str.3 = [16 x i8] c"Enter command: \00"
@.str.4 = [3 x i8] c"%d\00"
@.str.5 = [25 x i8] c"Enter amount of credit: \00"
@.str.6 = [3 x i8] c"%f\00"
@.str.7 = [24 x i8] c"Enter amount of debit: \00"
@.str.8 = [24 x i8] c"Current balance: $%.2f\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca float
%4 = alloca float
%5 = alloca float
store i32 0, i32* %1
store float 0.000000e+00, float* %3
%6 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([42 x i8], [42 x i8]* @.str, i64 0, i64 0))
%7 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([39 x i8], [39 x i8]* @.str.1, i64 0, i64 0))
%8 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.2, i64 0, i64 0))
br label %9
9: ; preds = %34, %0
%10 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.3, i64 0, i64 0))
%11 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.4, i64 0, i64 0), i32* %2)
%12 = load i32, i32* %2
switch i32 %12, label %31 [
i32 0, label %13
i32 1, label %14
i32 2, label %20
i32 3, label %26
i32 4, label %30
]
13: ; preds = %9
store float 0.000000e+00, float* %3
br label %34
14: ; preds = %9
%15 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.5, i64 0, i64 0))
%16 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.6, i64 0, i64 0), float* %4)
%17 = load float, float* %4
%18 = load float, float* %3
%19 = fadd float %18, %17
store float %19, float* %3
br label %34
20: ; preds = %9
%21 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.7, i64 0, i64 0))
%22 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.6, i64 0, i64 0), float* %5)
%23 = load float, float* %5
%24 = load float, float* %3
%25 = fsub float %24, %23
store float %25, float* %3
br label %34
26: ; preds = %9
%27 = load float, float* %3
%28 = fpext float %27 to double
%29 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.8, i64 0, i64 0), double %28)
br label %34
30: ; preds = %9
ret i32 0
31: ; preds = %9
%32 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([39 x i8], [39 x i8]* @.str.1, i64 0, i64 0))
%33 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.2, i64 0, i64 0))
br label %34
34: ; preds = %31, %26, %20, %14, %13
br label %9
}

LLVM IR (-O2):
@.str.1 = [39 x i8] c"Commands: 0=clear, 1=credit, 2=debit, \00"
@.str.3 = [16 x i8] c"Enter command: \00"
@.str.4 = [3 x i8] c"%d\00"
@.str.5 = [25 x i8] c"Enter amount of credit: \00"
@.str.6 = [3 x i8] c"%f\00"
@.str.7 = [24 x i8] c"Enter amount of debit: \00"
@.str.8 = [24 x i8] c"Current balance: $%.2f\0A\00"
@str = [41 x i8] c"*** ACME checkbook-balancing program ***\00"
@str.10 = [19 x i8] c"3=balance, 4=exit\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca float
%3 = alloca float
%4 = bitcast i32* %1 to i8*
%5 = bitcast float* %2 to i8*
%6 = bitcast float* %3 to i8*
%7 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([41 x i8], [41 x i8]* @str, i64 0, i64 0))
%8 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([39 x i8], [39 x i8]* @.str.1, i64 0, i64 0))
%9 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([19 x i8], [19 x i8]* @str.10, i64 0, i64 0))
br label %10
10: ; preds = %27, %0
%11 = phi float [ 0.000000e+00, %0 ], [ %28, %27 ]
%12 = fpext float %11 to double
br label %13
13: ; preds = %35, %10
%14 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([16 x i8], [16 x i8]* @.str.3, i64 0, i64 0))
%15 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.4, i64 0, i64 0), i32* %1)
%16 = load i32, i32* %1
switch i32 %16, label %32 [
i32 0, label %27
i32 1, label %17
i32 2, label %22
i32 3, label %29
i32 4, label %31
]
17: ; preds = %13
%18 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([25 x i8], [25 x i8]* @.str.5, i64 0, i64 0))
%19 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.6, i64 0, i64 0), float* %2)
%20 = load float, float* %2
%21 = fadd float %11, %20
br label %27
22: ; preds = %13
%23 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([24 x i8], [24 x i8]* @.str.7, i64 0, i64 0))
%24 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.6, i64 0, i64 0), float* %3)
%25 = load float, float* %3
%26 = fsub float %11, %25
br label %27
27: ; preds = %13, %22, %17
%28 = phi float [ %21, %17 ], [ %26, %22 ], [ 0.000000e+00, %13 ]
br label %10
29: ; preds = %13
%30 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([24 x i8], [24 x i8]* @.str.8, i64 0, i64 0), double %12)
br label %35
31: ; preds = %13
ret i32 0
32: ; preds = %13
%33 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([39 x i8], [39 x i8]* @.str.1, i64 0, i64 0))
%34 = call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([19 x i8], [19 x i8]* @str.10, i64 0, i64 0))
br label %35
35: ; preds = %32, %29
br label %13
}