#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 score, A, B, C, D;
  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) {
    printf("Student has an A grade\n");
  } else if (score < A && score >= B) {
    printf("Student has an B grade\n");
  } else if (score < B && score >= C) {
    printf("Student has an C grade\n");
  } else if (score < C && score >= D) {
    printf("Student has an D grade\n");
  } else {
    printf("Student has failed the course\n");
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeca(%rip),%rdi
call   1030 <printf@plt>
lea    0xf07(%rip),%rdi
lea    -0xc(%rbp),%rsi
lea    -0x10(%rbp),%rdx
lea    -0x14(%rbp),%rcx
lea    -0x18(%rbp),%r8
mov    $0x0,%al
call   1040 <scanf@plt>
lea    0xef2(%rip),%rdi
call   1030 <printf@plt>
lea    0xee3(%rip),%rdi
lea    -0x8(%rbp),%rsi
mov    $0x0,%al
call   1040 <scanf@plt>
movss  -0x8(%rbp),%xmm0
ucomiss -0xc(%rbp),%xmm0
jb     1197 <main+0x77>
lea    0xef4(%rip),%rdi
call   1030 <printf@plt>
jmp    124b <main+0x12b>
movss  -0x8(%rbp),%xmm1
movss  -0xc(%rbp),%xmm0
ucomiss %xmm1,%xmm0
jbe    11ca <main+0xaa>
movss  -0x8(%rbp),%xmm0
ucomiss -0x10(%rbp),%xmm0
jb     11ca <main+0xaa>
lea    0xed9(%rip),%rdi
call   1030 <printf@plt>
jmp    1246 <main+0x126>
movss  -0x8(%rbp),%xmm1
movss  -0x10(%rbp),%xmm0
ucomiss %xmm1,%xmm0
jbe    11fd <main+0xdd>
movss  -0x8(%rbp),%xmm0
ucomiss -0x14(%rbp),%xmm0
jb     11fd <main+0xdd>
lea    0xebe(%rip),%rdi
call   1030 <printf@plt>
jmp    1241 <main+0x121>
movss  -0x8(%rbp),%xmm1
movss  -0x14(%rbp),%xmm0
ucomiss %xmm1,%xmm0
jbe    1230 <main+0x110>
movss  -0x8(%rbp),%xmm0
ucomiss -0x18(%rbp),%xmm0
jb     1230 <main+0x110>
lea    0xea3(%rip),%rdi
call   1030 <printf@plt>
jmp    123c <main+0x11c>
lea    0xeaa(%rip),%rdi
call   1030 <printf@plt>
jmp    1241 <main+0x121>
jmp    1246 <main+0x126>
jmp    124b <main+0x12b>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
sub    $0x18,%rsp
lea    0xec5(%rip),%rdi
call   1040 <printf@plt>
lea    0xf02(%rip),%rdi
lea    0x10(%rsp),%rsi
lea    0xc(%rsp),%rdx
lea    0x8(%rsp),%rcx
lea    0x4(%rsp),%r8
xor    %eax,%eax
call   1050 <scanf@plt>
lea    0xee9(%rip),%rdi
call   1040 <printf@plt>
lea    0xeda(%rip),%rdi
lea    0x14(%rsp),%rsi
xor    %eax,%eax
call   1050 <scanf@plt>
movss  0x14(%rsp),%xmm0
movss  0x10(%rsp),%xmm1
ucomiss %xmm1,%xmm0
jae    11ab <main+0x7b>
ucomiss %xmm0,%xmm1
movss  0xc(%rsp),%xmm1
jbe    11b4 <main+0x84>
ucomiss %xmm1,%xmm0
jb     11b4 <main+0x84>
lea    0xf24(%rip),%rdi
jmp    11eb <main+0xbb>
lea    0xf32(%rip),%rdi
jmp    11eb <main+0xbb>
ucomiss %xmm0,%xmm1
movss  0x8(%rsp),%xmm1
jbe    11cd <main+0x9d>
ucomiss %xmm1,%xmm0
jb     11cd <main+0x9d>
lea    0xeeb(%rip),%rdi
jmp    11eb <main+0xbb>
ucomiss 0x4(%rsp),%xmm0
lea    0xea8(%rip),%rax
lea    0xebf(%rip),%rdi
cmovb  %rax,%rdi
ucomiss %xmm0,%xmm1
cmovbe %rax,%rdi
call   1030 <puts@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 = [47 x i8] c"Thank you. Now enter student score (percent) >\00"
@.str.3 = [3 x i8] c"%f\00"
@.str.4 = [24 x i8] c"Student has an A grade\0A\00"
@.str.5 = [24 x i8] c"Student has an B grade\0A\00"
@.str.6 = [24 x i8] c"Student has an C grade\0A\00"
@.str.7 = [24 x i8] c"Student has an D grade\0A\00"
@.str.8 = [31 x i8] c"Student has failed the course\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca float
%3 = alloca float
%4 = alloca float
%5 = alloca float
%6 = alloca float
store i32 0, i32* %1
%7 = call i32 @printf(i8* getelementptr inbounds ([73 x i8], [73 x i8]* @.str, i64 0, i64 0))
%8 = call i32 (i8*, float*, ...) @scanf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), float* %3, float* %4, float* %5, float* %6)
%9 = call i32 @printf(i8* getelementptr inbounds ([47 x i8], [47 x i8]* @.str.2, i64 0, i64 0))
%10 = call i32 (i8*, float*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.3, i64 0, i64 0), float* %2)
%11 = load float, float* %2
%12 = load float, float* %3
%13 = fcmp oge float %11, %12
br i1 %13, label %14, label %16
14: ; preds = %0
%15 = call i32 @printf(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.4, i64 0, i64 0))
br label %51
16: ; preds = %0
%17 = load float, float* %2
%18 = load float, float* %3
%19 = fcmp olt float %17, %18
br i1 %19, label %20, label %26
20: ; preds = %16
%21 = load float, float* %2
%22 = load float, float* %4
%23 = fcmp oge float %21, %22
br i1 %23, label %24, label %26
24: ; preds = %20
%25 = call i32 @printf(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.5, i64 0, i64 0))
br label %50
26: ; preds = %20, %16
%27 = load float, float* %2
%28 = load float, float* %4
%29 = fcmp olt float %27, %28
br i1 %29, label %30, label %36
30: ; preds = %26
%31 = load float, float* %2
%32 = load float, float* %5
%33 = fcmp oge float %31, %32
br i1 %33, label %34, label %36
34: ; preds = %30
%35 = call i32 @printf(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.6, i64 0, i64 0))
br label %49
36: ; preds = %30, %26
%37 = load float, float* %2
%38 = load float, float* %5
%39 = fcmp olt float %37, %38
br i1 %39, label %40, label %46
40: ; preds = %36
%41 = load float, float* %2
%42 = load float, float* %6
%43 = fcmp oge float %41, %42
br i1 %43, label %44, label %46
44: ; preds = %40
%45 = call i32 @printf(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.7, i64 0, i64 0))
br label %48
46: ; preds = %40, %36
%47 = call i32 @printf(i8* getelementptr inbounds ([31 x i8], [31 x i8]* @.str.8, i64 0, i64 0))
br label %48
48: ; preds = %46, %44
br label %49
49: ; preds = %48, %34
br label %50
50: ; preds = %49, %24
br label %51
51: ; preds = %50, %14
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 = [47 x i8] c"Thank you. Now enter student score (percent) >\00"
@.str.3 = [3 x i8] c"%f\00"
@str = [30 x i8] c"Student has failed the course\00"
@str.9 = [23 x i8] c"Student has an D grade\00"
@str.10 = [23 x i8] c"Student has an C grade\00"
@str.11 = [23 x i8] c"Student has an B grade\00"
@str.12 = [23 x i8] c"Student has an A grade\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 @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* %2, float* %3, float* %4, float* %5)
%13 = call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([47 x i8], [47 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* %1)
%15 = load float, float* %1
%16 = load float, float* %2
%17 = fcmp ult float %15, %16
br i1 %17, label %18, label %34
18: ; preds = %0
%19 = fcmp uge float %15, %16
%20 = load float, float* %3
%21 = fcmp ult float %15, %20
%22 = select i1 %19, i1 true, i1 %21
br i1 %22, label %23, label %34
23: ; preds = %18
%24 = fcmp uge float %15, %20
%25 = load float, float* %4
%26 = fcmp ult float %15, %25
%27 = select i1 %24, i1 true, i1 %26
br i1 %27, label %28, label %34
28: ; preds = %23
%29 = fcmp uge float %15, %25
%30 = load float, float* %5
%31 = fcmp ult float %15, %30
%32 = select i1 %29, i1 true, i1 %31
%33 = select i1 %32, i8* getelementptr inbounds ([30 x i8], [30 x i8]* @str, i64 0, i64 0), i8* getelementptr inbounds ([23 x i8], [23 x i8]* @str.9, i64 0, i64 0)
br label %34
34: ; preds = %28, %23, %18, %0
%35 = phi i8* [ getelementptr inbounds ([23 x i8], [23 x i8]* @str.12, i64 0, i64 0), %0 ], [ getelementptr inbounds ([23 x i8], [23 x i8]* @str.11, i64 0, i64 0), %18 ], [ getelementptr inbounds ([23 x i8], [23 x i8]* @str.10, i64 0, i64 0), %23 ], [ %33, %28 ]
%36 = call i32 @puts(i8* dereferenceable(1) %35)
ret i32 0
}