#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;
  printf("Enter threshold for A, B, C, D\n");
  printf("in this order, decreasing persentages > ");
  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 a B grade\n");
  } else if (score < B && score >= C) {
    printf("Student has a C grade\n");
  } else if (score < C && score >= D) {
    printf("Student has a 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    0xede(%rip),%rdi
call   1030 <printf@plt>
lea    0xefb(%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    0xee6(%rip),%rdi
call   1030 <printf@plt>
lea    0xed7(%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    1257 <main+0x137>
movss  -0x18(%rbp),%xmm1
movss  -0x8(%rbp),%xmm0
ucomiss %xmm1,%xmm0
jbe    11d6 <main+0xb6>
movss  -0x18(%rbp),%xmm0
ucomiss -0xc(%rbp),%xmm0
jb     11d6 <main+0xb6>
lea    0xece(%rip),%rdi
call   1030 <printf@plt>
jmp    1252 <main+0x132>
movss  -0x18(%rbp),%xmm1
movss  -0xc(%rbp),%xmm0
ucomiss %xmm1,%xmm0
jbe    1209 <main+0xe9>
movss  -0x18(%rbp),%xmm0
ucomiss -0x10(%rbp),%xmm0
jb     1209 <main+0xe9>
lea    0xeb2(%rip),%rdi
call   1030 <printf@plt>
jmp    124d <main+0x12d>
movss  -0x18(%rbp),%xmm1
movss  -0x10(%rbp),%xmm0
ucomiss %xmm1,%xmm0
jbe    123c <main+0x11c>
movss  -0x18(%rbp),%xmm0
ucomiss -0x14(%rbp),%xmm0
jb     123c <main+0x11c>
lea    0xe96(%rip),%rdi
call   1030 <printf@plt>
jmp    1248 <main+0x128>
lea    0xe9c(%rip),%rdi
call   1030 <printf@plt>
jmp    124d <main+0x12d>
jmp    1252 <main+0x132>
jmp    1257 <main+0x137>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
sub    $0x18,%rsp
lea    0xf27(%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
movss  0x14(%rsp),%xmm1
ucomiss %xmm1,%xmm0
jae    11b7 <main+0x87>
ucomiss %xmm0,%xmm1
movss  0x10(%rsp),%xmm1
jbe    11c0 <main+0x90>
ucomiss %xmm1,%xmm0
jb     11c0 <main+0x90>
lea    0xf16(%rip),%rdi
jmp    11f7 <main+0xc7>
lea    0xf23(%rip),%rdi
jmp    11f7 <main+0xc7>
ucomiss %xmm0,%xmm1
movss  0xc(%rsp),%xmm1
jbe    11d9 <main+0xa9>
ucomiss %xmm1,%xmm0
jb     11d9 <main+0xa9>
lea    0xede(%rip),%rdi
jmp    11f7 <main+0xc7>
ucomiss 0x8(%rsp),%xmm0
lea    0xe9c(%rip),%rax
lea    0xeb3(%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 = [32 x i8] c"Enter threshold for A, B, C, D\0A\00"
@.str.1 = [41 x i8] c"in this order, decreasing persentages > \00"
@.str.2 = [9 x i8] c"%f%f%f%f\00"
@.str.3 = [48 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 = [23 x i8] c"Student has a B grade\0A\00"
@.str.7 = [23 x i8] c"Student has a C grade\0A\00"
@.str.8 = [23 x i8] c"Student has a 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 ([32 x i8], [32 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 ([48 x i8], [48 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 %52
17: ; preds = %0
%18 = load float, float* %6
%19 = load float, float* %2
%20 = fcmp olt float %18, %19
br i1 %20, label %21, label %27
21: ; preds = %17
%22 = load float, float* %6
%23 = load float, float* %3
%24 = fcmp oge float %22, %23
br i1 %24, label %25, label %27
25: ; preds = %21
%26 = call i32 @printf(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.6, i64 0, i64 0))
br label %51
27: ; preds = %21, %17
%28 = load float, float* %6
%29 = load float, float* %3
%30 = fcmp olt float %28, %29
br i1 %30, label %31, label %37
31: ; preds = %27
%32 = load float, float* %6
%33 = load float, float* %4
%34 = fcmp oge float %32, %33
br i1 %34, label %35, label %37
35: ; preds = %31
%36 = call i32 @printf(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.7, i64 0, i64 0))
br label %50
37: ; preds = %31, %27
%38 = load float, float* %6
%39 = load float, float* %4
%40 = fcmp olt float %38, %39
br i1 %40, label %41, label %47
41: ; preds = %37
%42 = load float, float* %6
%43 = load float, float* %5
%44 = fcmp oge float %42, %43
br i1 %44, label %45, label %47
45: ; preds = %41
%46 = call i32 @printf(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.8, i64 0, i64 0))
br label %49
47: ; preds = %41, %37
%48 = call i32 @printf(i8* getelementptr inbounds ([31 x i8], [31 x i8]* @.str.9, i64 0, i64 0))
br label %49
49: ; preds = %47, %45
br label %50
50: ; preds = %49, %35
br label %51
51: ; preds = %50, %25
br label %52
52: ; preds = %51, %15
ret i32 0
}

LLVM IR (-O2):
@.str.1 = [41 x i8] c"in this order, decreasing persentages > \00"
@.str.2 = [9 x i8] c"%f%f%f%f\00"
@.str.3 = [48 x i8] c"Thank you. Now enter student score (percent) > \00"
@.str.4 = [3 x i8] c"%f\00"
@str = [31 x i8] c"Enter threshold for A, B, C, D\00"
@str.10 = [30 x i8] c"Student has failed the course\00"
@str.11 = [22 x i8] c"Student has a D grade\00"
@str.12 = [22 x i8] c"Student has a C grade\00"
@str.13 = [22 x i8] c"Student has a 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 ([31 x i8], [31 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 ([48 x i8], [48 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 %35
19: ; preds = %0
%20 = fcmp uge float %16, %17
%21 = load float, float* %2
%22 = fcmp ult float %16, %21
%23 = select i1 %20, i1 true, i1 %22
br i1 %23, label %24, label %35
24: ; preds = %19
%25 = fcmp uge float %16, %21
%26 = load float, float* %3
%27 = fcmp ult float %16, %26
%28 = select i1 %25, i1 true, i1 %27
br i1 %28, label %29, label %35
29: ; preds = %24
%30 = fcmp uge float %16, %26
%31 = load float, float* %4
%32 = fcmp ult float %16, %31
%33 = select i1 %30, i1 true, i1 %32
%34 = select i1 %33, i8* getelementptr inbounds ([30 x i8], [30 x i8]* @str.10, i64 0, i64 0), i8* getelementptr inbounds ([22 x i8], [22 x i8]* @str.11, i64 0, i64 0)
br label %35
35: ; preds = %29, %24, %19, %0
%36 = phi i8* [ getelementptr inbounds ([23 x i8], [23 x i8]* @str.14, i64 0, i64 0), %0 ], [ getelementptr inbounds ([22 x i8], [22 x i8]* @str.13, i64 0, i64 0), %19 ], [ getelementptr inbounds ([22 x i8], [22 x i8]* @str.12, i64 0, i64 0), %24 ], [ %34, %29 ]
%37 = call i32 @puts(i8* dereferenceable(1) %36)
ret i32 0
}