#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 */
float M_PI;
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ scanf(char *, float *);
void circle_area() {
  float r, a;
  printf("Radius Length: ");
  scanf("%f", &r);
  a = r * r * M_PI;
  printf("Area is: %f", a);
  printf("\n");
}


x86 assembly (clang, -O0):
<circle_area>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
lea    0xed1(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xedc(%rip),%rdi
lea    -0x4(%rbp),%rsi
call   1040 <scanf@plt>
movss  -0x4(%rbp),%xmm0
mulss  -0x4(%rbp),%xmm0
mov    0x2e91(%rip),%rax
mulss  (%rax),%xmm0
movss  %xmm0,-0x8(%rbp)
movss  -0x8(%rbp),%xmm0
cvtss2sd %xmm0,%xmm0
lea    0xea0(%rip),%rdi
mov    $0x1,%al
call   1030 <printf@plt>
lea    0xe9e(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<circle_area>:
push   %rax
lea    0xec8(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xed3(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1050 <scanf@plt>
movss  0x4(%rsp),%xmm0
mulss  %xmm0,%xmm0
mov    0x2e87(%rip),%rax
mulss  (%rax),%xmm0
cvtss2sd %xmm0,%xmm0
lea    0xea0(%rip),%rdi
mov    $0x1,%al
call   1040 <printf@plt>
mov    $0xa,%edi
call   1030 <putchar@plt>
pop    %rax
ret

LLVM IR (-O0):
@.str = [16 x i8] c"Radius Length: \00"
@.str.1 = [3 x i8] c"%f\00"
@M_PI = global float 0.000000e+00
@.str.2 = [12 x i8] c"Area is: %f\00"
@.str.3 = [2 x i8] c"\0A\00"
define void @circle_area() {
%1 = alloca float
%2 = alloca float
%3 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str, i64 0, i64 0))
%4 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), float* %1)
%5 = load float, float* %1
%6 = load float, float* %1
%7 = fmul float %5, %6
%8 = load float, float* @M_PI
%9 = fmul float %7, %8
store float %9, float* %2
%10 = load float, float* %2
%11 = fpext float %10 to double
%12 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.2, i64 0, i64 0), double %11)
%13 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i64 0, i64 0))
ret void
}

LLVM IR (-O2):
@.str = [16 x i8] c"Radius Length: \00"
@.str.1 = [3 x i8] c"%f\00"
@M_PI = global float 0.000000e+00
@.str.2 = [12 x i8] c"Area is: %f\00"
define void @circle_area() {
%1 = alloca float
%2 = bitcast float* %1 to i8*
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([16 x i8], [16 x i8]* @.str, i64 0, i64 0))
%4 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), float* %1)
%5 = load float, float* %1
%6 = fmul float %5, %5
%7 = load float, float* @M_PI
%8 = fmul float %6, %7
%9 = fpext float %8 to double
%10 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([12 x i8], [12 x i8]* @.str.2, i64 0, i64 0), double %9)
%11 = call i32 @putchar(i32 10)
ret void
}