#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, score;
  char grade;
  printf("Enter thresholds for A, B, C, D\nin that order, decreasing "
         "percentages > ");
  scanf("%f%f%f%f", &a, &b, &c, &d);
  printf("Thank you. Now enter student score (percent) > ");
  scanf("%f", &score);
  if (score >= a)
    grade = 'A';
  else if ((score >= b) && (score < a))
    grade = 'B';
  else if ((score >= c) && (score < b))
    grade = 'C';
  else if ((score >= d) && (score < c))
    grade = 'D';
  printf("Student has an %c grade\n", grade);
  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    0xf05(%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    0xef0(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xedf(%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    121e <main+0xfe>
movss  -0x18(%rbp),%xmm0
ucomiss -0xc(%rbp),%xmm0
jb     11be <main+0x9e>
movss  -0x18(%rbp),%xmm1
movss  -0x8(%rbp),%xmm0
ucomiss %xmm1,%xmm0
jbe    11be <main+0x9e>
movb   $0x42,-0x19(%rbp)
jmp    1219 <main+0xf9>
movss  -0x18(%rbp),%xmm0
ucomiss -0x10(%rbp),%xmm0
jb     11e9 <main+0xc9>
movss  -0x18(%rbp),%xmm1
movss  -0xc(%rbp),%xmm0
ucomiss %xmm1,%xmm0
jbe    11e9 <main+0xc9>
movb   $0x43,-0x19(%rbp)
jmp    1214 <main+0xf4>
movss  -0x18(%rbp),%xmm0
ucomiss -0x14(%rbp),%xmm0
jb     120f <main+0xef>
movss  -0x18(%rbp),%xmm1
movss  -0x10(%rbp),%xmm0
ucomiss %xmm1,%xmm0
jbe    120f <main+0xef>
movb   $0x44,-0x19(%rbp)
jmp    1214 <main+0xf4>
jmp    1219 <main+0xf9>
jmp    121e <main+0xfe>
movsbl -0x19(%rbp),%esi
lea    0xe59(%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    0xf10(%rip),%rdi
lea    0x14(%rsp),%rsi
lea    0x10(%rsp),%rdx
lea    0xc(%rsp),%rcx
lea    0x8(%rsp),%r8
xor    %eax,%eax
call   1040 <scanf@plt>
lea    0xef7(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xee6(%rip),%rdi
lea    0x4(%rsp),%rsi
xor    %eax,%eax
call   1040 <scanf@plt>
movss  0x4(%rsp),%xmm0
movss  0x14(%rsp),%xmm2
mov    $0x41,%esi
ucomiss %xmm2,%xmm0
jae    11ca <main+0xaa>
movss  0x10(%rsp),%xmm1
ucomiss %xmm1,%xmm0
jb     11a0 <main+0x80>
mov    $0x42,%esi
ucomiss %xmm0,%xmm2
ja     11ca <main+0xaa>
movss  0xc(%rsp),%xmm2
ucomiss %xmm2,%xmm0
jb     11b5 <main+0x95>
mov    $0x43,%esi
ucomiss %xmm0,%xmm1
ja     11ca <main+0xaa>
xor    %eax,%eax
ucomiss %xmm0,%xmm2
mov    $0x44,%esi
cmovbe %eax,%esi
ucomiss 0x8(%rsp),%xmm0
cmovb  %eax,%esi
lea    0xeb1(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x18,%rsp
ret

LLVM IR (-O0):
@.str = [73 x i8] c"Enter thresholds for A, B, C, D\0Ain that order, decreasing percentages > \00"
@.str.1 = [9 x i8] c"%f%f%f%f\00"
@.str.2 = [48 x i8] c"Thank you. Now enter student score (percent) > \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 ([73 x i8], [73 x i8]* @.str, i64 0, i64 0))
%9 = call i32 (i8*, float*, ...) @scanf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), float* %2, float* %3, float* %4, float* %5)
%10 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([48 x i8], [48 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 %46
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 %25
20: ; preds = %16
%21 = load float, float* %6
%22 = load float, float* %2
%23 = fcmp olt float %21, %22
br i1 %23, label %24, label %25
24: ; preds = %20
store i8 66, i8* %7
br label %45
25: ; preds = %20, %16
%26 = load float, float* %6
%27 = load float, float* %4
%28 = fcmp oge float %26, %27
br i1 %28, label %29, label %34
29: ; preds = %25
%30 = load float, float* %6
%31 = load float, float* %3
%32 = fcmp olt float %30, %31
br i1 %32, label %33, label %34
33: ; preds = %29
store i8 67, i8* %7
br label %44
34: ; preds = %29, %25
%35 = load float, float* %6
%36 = load float, float* %5
%37 = fcmp oge float %35, %36
br i1 %37, label %38, label %43
38: ; preds = %34
%39 = load float, float* %6
%40 = load float, float* %4
%41 = fcmp olt float %39, %40
br i1 %41, label %42, label %43
42: ; preds = %38
store i8 68, i8* %7
br label %43
43: ; preds = %42, %38, %34
br label %44
44: ; preds = %43, %33
br label %45
45: ; preds = %44, %24
br label %46
46: ; preds = %45, %15
%47 = load i8, i8* %7
%48 = sext i8 %47 to i32
%49 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.4, i64 0, i64 0), i32 %48)
ret i32 0
}

LLVM IR (-O2):
@.str = [73 x i8] c"Enter thresholds for A, B, C, D\0Ain that order, decreasing percentages > \00"
@.str.1 = [9 x i8] c"%f%f%f%f\00"
@.str.2 = [48 x i8] c"Thank you. Now enter student score (percent) > \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 ([73 x i8], [73 x i8]* @.str, i64 0, i64 0))
%12 = call i32 (i8*, float*, ...) @scanf(i8* getelementptr inbounds ([9 x i8], [9 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 ([48 x i8], [48 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 %34
18: ; preds = %0
%19 = load float, float* %2
%20 = fcmp oge float %15, %19
%21 = fcmp olt float %15, %16
%22 = select i1 %20, i1 %21, i1 false
br i1 %22, label %34, label %23
23: ; preds = %18
%24 = load float, float* %3
%25 = fcmp oge float %15, %24
%26 = fcmp olt float %15, %19
%27 = select i1 %25, i1 %26, i1 false
br i1 %27, label %34, label %28
28: ; preds = %23
%29 = load float, float* %4
%30 = fcmp oge float %15, %29
%31 = fcmp olt float %15, %24
%32 = select i1 %30, i1 %31, i1 false
%33 = select i1 %32, i32 68, i32 0
br label %34
34: ; preds = %28, %23, %18, %0
%35 = phi i32 [ 65, %0 ], [ 66, %18 ], [ 67, %23 ], [ %33, %28 ]
%36 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([25 x i8], [25 x i8]* @.str.4, i64 0, i64 0), i32 %35)
ret i32 0
}