#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(void) {
  float a, b, c, d, grade;
  printf("Enter thresholds for A, B, C, D\n");
  printf("in that order, decreasing percentages > ");
  scanf("%f%f%f%f", &a, &b, &c, &d);
  printf("Thank you. Now enter student score (percent) >");
  scanf("%f", &grade);
  if (grade >= a)
    printf("Student has an A grade\n");
  else if (grade >= b)
    printf("Student has an B grade\n");
  else if (grade >= c)
    printf("Student has an C grade\n");
  else if (grade >= 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    0xedf(%rip),%rdi
call   1030 <printf@plt>
lea    0xefc(%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    0xee7(%rip),%rdi
call   1030 <printf@plt>
lea    0xed8(%rip),%rdi
lea    -0x18(%rbp),%rsi
mov    $0x0,%al
call   1040 <scanf@plt>
movss  -0x18(%rbp),%xmm0
ucomiss -0x8(%rbp),%xmm0
jb     11a3 <main+0x83>
lea    0xee9(%rip),%rdi
call   1030 <printf@plt>
jmp    121e <main+0xfe>
movss  -0x18(%rbp),%xmm0
ucomiss -0xc(%rbp),%xmm0
jb     11c3 <main+0xa3>
lea    0xee1(%rip),%rdi
call   1030 <printf@plt>
jmp    1219 <main+0xf9>
movss  -0x18(%rbp),%xmm0
ucomiss -0x10(%rbp),%xmm0
jb     11e3 <main+0xc3>
lea    0xed9(%rip),%rdi
call   1030 <printf@plt>
jmp    1214 <main+0xf4>
movss  -0x18(%rbp),%xmm0
ucomiss -0x14(%rbp),%xmm0
jb     1203 <main+0xe3>
lea    0xed1(%rip),%rdi
call   1030 <printf@plt>
jmp    120f <main+0xef>
lea    0xed8(%rip),%rdi
call   1030 <printf@plt>
jmp    1214 <main+0xf4>
jmp    1219 <main+0xf9>
jmp    121e <main+0xfe>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
sub    $0x18,%rsp
lea    0xf26(%rip),%rdi
call   1030 <puts@plt>
lea    0xeb9(%rip),%rdi
call   1040 <printf@plt>
lea    0xed6(%rip),%rdi
lea    0x14(%rsp),%rsi
lea    0x10(%rsp),%rdx
lea    0xc(%rsp),%rcx
lea    0x8(%rsp),%r8
xor    %eax,%eax
call   1050 <scanf@plt>
lea    0xebd(%rip),%rdi
call   1040 <printf@plt>
lea    0xeae(%rip),%rdi
lea    0x4(%rsp),%rsi
xor    %eax,%eax
call   1050 <scanf@plt>
movss  0x4(%rsp),%xmm0
ucomiss 0x14(%rsp),%xmm0
jae    11c1 <main+0x91>
ucomiss 0x10(%rsp),%xmm0
jae    11ca <main+0x9a>
ucomiss 0xc(%rsp),%xmm0
jae    11d3 <main+0xa3>
ucomiss 0x8(%rsp),%xmm0
lea    0xecd(%rip),%rax
lea    0xee4(%rip),%rdi
cmovb  %rax,%rdi
jmp    11da <main+0xaa>
lea    0xf1c(%rip),%rdi
jmp    11da <main+0xaa>
lea    0xefc(%rip),%rdi
jmp    11da <main+0xaa>
lea    0xedc(%rip),%rdi
call   1030 <puts@plt>
xor    %eax,%eax
add    $0x18,%rsp
ret

LLVM IR (-O0):
@.str = [33 x i8] c"Enter thresholds for A, B, C, D\0A\00"
@.str.1 = [41 x i8] c"in that order, decreasing percentages > \00"
@.str.2 = [9 x i8] c"%f%f%f%f\00"
@.str.3 = [47 x i8] c"Thank you. Now enter student score (percent) >\00"
@.str.4 = [3 x i8] c"%f\00"
@.str.5 = [24 x i8] c"Student has an A grade\0A\00"
@.str.6 = [24 x i8] c"Student has an B grade\0A\00"
@.str.7 = [24 x i8] c"Student has an C grade\0A\00"
@.str.8 = [24 x i8] c"Student has an D grade\0A\00"
@.str.9 = [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 ([33 x i8], [33 x i8]* @.str, i64 0, i64 0))
%8 = call i32 @printf(i8* getelementptr inbounds ([41 x i8], [41 x i8]* @.str.1, i64 0, i64 0))
%9 = call i32 (i8*, float*, ...) @scanf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.2, i64 0, i64 0), float* %2, float* %3, float* %4, float* %5)
%10 = call i32 @printf(i8* getelementptr inbounds ([47 x i8], [47 x i8]* @.str.3, i64 0, i64 0))
%11 = call i32 (i8*, float*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.4, 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 %17
15: ; preds = %0
%16 = call i32 @printf(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.5, i64 0, i64 0))
br label %40
17: ; preds = %0
%18 = load float, float* %6
%19 = load float, float* %3
%20 = fcmp oge float %18, %19
br i1 %20, label %21, label %23
21: ; preds = %17
%22 = call i32 @printf(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.6, i64 0, i64 0))
br label %39
23: ; preds = %17
%24 = load float, float* %6
%25 = load float, float* %4
%26 = fcmp oge float %24, %25
br i1 %26, label %27, label %29
27: ; preds = %23
%28 = call i32 @printf(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.7, i64 0, i64 0))
br label %38
29: ; preds = %23
%30 = load float, float* %6
%31 = load float, float* %5
%32 = fcmp oge float %30, %31
br i1 %32, label %33, label %35
33: ; preds = %29
%34 = call i32 @printf(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.8, i64 0, i64 0))
br label %37
35: ; preds = %29
%36 = call i32 @printf(i8* getelementptr inbounds ([31 x i8], [31 x i8]* @.str.9, i64 0, i64 0))
br label %37
37: ; preds = %35, %33
br label %38
38: ; preds = %37, %27
br label %39
39: ; preds = %38, %21
br label %40
40: ; preds = %39, %15
ret i32 0
}

LLVM IR (-O2):
@.str.1 = [41 x i8] c"in that order, decreasing percentages > \00"
@.str.2 = [9 x i8] c"%f%f%f%f\00"
@.str.3 = [47 x i8] c"Thank you. Now enter student score (percent) >\00"
@.str.4 = [3 x i8] c"%f\00"
@str = [32 x i8] c"Enter thresholds for A, B, C, D\00"
@str.10 = [30 x i8] c"Student has failed the course\00"
@str.11 = [23 x i8] c"Student has an D grade\00"
@str.12 = [23 x i8] c"Student has an C grade\00"
@str.13 = [23 x i8] c"Student has an B grade\00"
@str.14 = [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 @puts(i8* dereferenceable(1) getelementptr inbounds ([32 x i8], [32 x i8]* @str, i64 0, i64 0))
%12 = tail call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([41 x i8], [41 x i8]* @.str.1, i64 0, i64 0))
%13 = call i32 (i8*, float*, ...) @scanf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.2, i64 0, i64 0), float* %1, float* %2, float* %3, float* %4)
%14 = call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([47 x i8], [47 x i8]* @.str.3, i64 0, i64 0))
%15 = call i32 (i8*, float*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.4, i64 0, i64 0), float* %5)
%16 = load float, float* %5
%17 = load float, float* %1
%18 = fcmp ult float %16, %17
br i1 %18, label %19, label %29
19: ; preds = %0
%20 = load float, float* %2
%21 = fcmp ult float %16, %20
br i1 %21, label %22, label %29
22: ; preds = %19
%23 = load float, float* %3
%24 = fcmp ult float %16, %23
br i1 %24, label %25, label %29
25: ; preds = %22
%26 = load float, float* %4
%27 = fcmp ult float %16, %26
%28 = select i1 %27, i8* getelementptr inbounds ([30 x i8], [30 x i8]* @str.10, i64 0, i64 0), i8* getelementptr inbounds ([23 x i8], [23 x i8]* @str.11, i64 0, i64 0)
br label %29
29: ; preds = %25, %22, %19, %0
%30 = phi i8* [ getelementptr inbounds ([23 x i8], [23 x i8]* @str.14, i64 0, i64 0), %0 ], [ getelementptr inbounds ([23 x i8], [23 x i8]* @str.13, i64 0, i64 0), %19 ], [ getelementptr inbounds ([23 x i8], [23 x i8]* @str.12, i64 0, i64 0), %22 ], [ %28, %25 ]
%31 = call i32 @puts(i8* dereferenceable(1) %30)
ret i32 0
}