#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 *, float *, ...);
int main() {
  float A, B, C, D, studentscore;
  char lettergrade;
  printf("Enter thresholds for A, B, C, D in that order, decreasing "
         "percentages > Thank you. ");
  scanf("%f %f %f %f", &A, &B, &C, &D);
  printf("Now enter student score (perecnt) >");
  scanf("%f", &studentscore);
  if (studentscore >= A)
    lettergrade = 'A';
  else if (studentscore >= B)
    lettergrade = 'B';
  else if (studentscore >= C)
    lettergrade = 'C';
  else
    lettergrade = 'D';
  printf("Student has an %c grade\n", lettergrade);
  return (0);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeca(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xf10(%rip),%rdi
lea    -0x8(%rbp),%rsi
lea    -0xc(%rbp),%rdx
lea    -0x10(%rbp),%rcx
lea    -0x14(%rbp),%r8
mov    $0x0,%al
call   1040 <scanf@plt>
lea    0xefe(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xeed(%rip),%rdi
lea    -0x18(%rbp),%rsi
mov    $0x0,%al
call   1040 <scanf@plt>
movss  -0x18(%rbp),%xmm0
ucomiss -0x8(%rbp),%xmm0
jb     1193 <main+0x73>
movb   $0x41,-0x19(%rbp)
jmp    11d1 <main+0xb1>
movss  -0x18(%rbp),%xmm0
ucomiss -0xc(%rbp),%xmm0
jb     11ab <main+0x8b>
movb   $0x42,-0x19(%rbp)
jmp    11cc <main+0xac>
movss  -0x18(%rbp),%xmm0
ucomiss -0x10(%rbp),%xmm0
jb     11c3 <main+0xa3>
movb   $0x43,-0x19(%rbp)
jmp    11c7 <main+0xa7>
movb   $0x44,-0x19(%rbp)
jmp    11cc <main+0xac>
jmp    11d1 <main+0xb1>
movsbl -0x19(%rbp),%esi
lea    0xea8(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
sub    $0x18,%rsp
lea    0xed5(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xf1b(%rip),%rdi
lea    0x10(%rsp),%rsi
lea    0xc(%rsp),%rdx
lea    0x8(%rsp),%rcx
lea    0x14(%rsp),%r8
xor    %eax,%eax
call   1040 <scanf@plt>
lea    0xf05(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xef4(%rip),%rdi
lea    0x4(%rsp),%rsi
xor    %eax,%eax
call   1040 <scanf@plt>
movss  0x4(%rsp),%xmm0
mov    $0x41,%esi
ucomiss 0x10(%rsp),%xmm0
jae    11a0 <main+0x80>
mov    $0x42,%esi
ucomiss 0xc(%rsp),%xmm0
jae    11a0 <main+0x80>
ucomiss 0x8(%rsp),%xmm0
mov    $0x43,%esi
adc    $0x0,%esi
lea    0xedd(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x18,%rsp
ret

LLVM IR (-O0):
@.str = [84 x i8] c"Enter thresholds for A, B, C, D in that order, decreasing percentages > Thank you. \00"
@.str.1 = [12 x i8] c"%f %f %f %f\00"
@.str.2 = [36 x i8] c"Now enter student score (perecnt) >\00"
@.str.3 = [3 x i8] c"%f\00"
@.str.4 = [25 x i8] c"Student has an %c grade\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca float
%3 = alloca float
%4 = alloca float
%5 = alloca float
%6 = alloca float
%7 = alloca i8
store i32 0, i32* %1
%8 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([84 x i8], [84 x i8]* @.str, i64 0, i64 0))
%9 = call i32 (i8*, float*, ...) @scanf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.1, i64 0, i64 0), float* %2, float* %3, float* %4, float* %5)
%10 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([36 x i8], [36 x i8]* @.str.2, i64 0, i64 0))
%11 = call i32 (i8*, float*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.3, i64 0, i64 0), float* %6)
%12 = load float, float* %6
%13 = load float, float* %2
%14 = fcmp oge float %12, %13
br i1 %14, label %15, label %16
15: ; preds = %0
store i8 65, i8* %7
br label %29
16: ; preds = %0
%17 = load float, float* %6
%18 = load float, float* %3
%19 = fcmp oge float %17, %18
br i1 %19, label %20, label %21
20: ; preds = %16
store i8 66, i8* %7
br label %28
21: ; preds = %16
%22 = load float, float* %6
%23 = load float, float* %4
%24 = fcmp oge float %22, %23
br i1 %24, label %25, label %26
25: ; preds = %21
store i8 67, i8* %7
br label %27
26: ; preds = %21
store i8 68, i8* %7
br label %27
27: ; preds = %26, %25
br label %28
28: ; preds = %27, %20
br label %29
29: ; preds = %28, %15
%30 = load i8, i8* %7
%31 = sext i8 %30 to i32
%32 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.4, i64 0, i64 0), i32 %31)
ret i32 0
}

LLVM IR (-O2):
@.str = [84 x i8] c"Enter thresholds for A, B, C, D in that order, decreasing percentages > Thank you. \00"
@.str.1 = [12 x i8] c"%f %f %f %f\00"
@.str.2 = [36 x i8] c"Now enter student score (perecnt) >\00"
@.str.3 = [3 x i8] c"%f\00"
@.str.4 = [25 x i8] c"Student has an %c grade\0A\00"
define i32 @main() {
%1 = alloca float
%2 = alloca float
%3 = alloca float
%4 = alloca float
%5 = alloca float
%6 = bitcast float* %1 to i8*
%7 = bitcast float* %2 to i8*
%8 = bitcast float* %3 to i8*
%9 = bitcast float* %4 to i8*
%10 = bitcast float* %5 to i8*
%11 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([84 x i8], [84 x i8]* @.str, i64 0, i64 0))
%12 = call i32 (i8*, float*, ...) @scanf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.1, i64 0, i64 0), float* %1, float* %2, float* %3, float* %4)
%13 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([36 x i8], [36 x i8]* @.str.2, i64 0, i64 0))
%14 = call i32 (i8*, float*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.3, i64 0, i64 0), float* %5)
%15 = load float, float* %5
%16 = load float, float* %1
%17 = fcmp ult float %15, %16
br i1 %17, label %18, label %25
18: ; preds = %0
%19 = load float, float* %2
%20 = fcmp ult float %15, %19
br i1 %20, label %21, label %25
21: ; preds = %18
%22 = load float, float* %3
%23 = fcmp ult float %15, %22
%24 = select i1 %23, i32 68, i32 67
br label %25
25: ; preds = %21, %18, %0
%26 = phi i32 [ 65, %0 ], [ 66, %18 ], [ %24, %21 ]
%27 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([25 x i8], [25 x i8]* @.str.4, i64 0, i64 0), i32 %26)
ret i32 0
}