#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(int argc, char const *argv[]) {
  float a, b;
  printf("a=");
  scanf("%f", &a);
  printf("b=");
  scanf("%f", &b);
  printf("\n( %.1f + %.1f ) / 2 = %.1f\n", a, b, (a + b) / 2);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
lea    0xec7(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xebc(%rip),%rdi
lea    -0x14(%rbp),%rsi
call   1040 <scanf@plt>
lea    0xeaf(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xe9e(%rip),%rdi
lea    -0x18(%rbp),%rsi
call   1040 <scanf@plt>
movss  -0x14(%rbp),%xmm0
cvtss2sd %xmm0,%xmm0
movss  -0x18(%rbp),%xmm1
cvtss2sd %xmm1,%xmm1
movss  -0x14(%rbp),%xmm2
addss  -0x18(%rbp),%xmm2
movss  0xe6a(%rip),%xmm3
divss  %xmm3,%xmm2
cvtss2sd %xmm2,%xmm2
lea    0xe68(%rip),%rdi
mov    $0x3,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x10,%rsp
lea    0xed8(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xecd(%rip),%rbx
lea    0xc(%rsp),%rsi
mov    %rbx,%rdi
call   1040 <scanf@plt>
lea    0xebc(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0x8(%rsp),%rsi
mov    %rbx,%rdi
call   1040 <scanf@plt>
movss  0xc(%rsp),%xmm2
cvtss2sd %xmm2,%xmm0
movss  0x8(%rsp),%xmm3
cvtss2sd %xmm3,%xmm1
addss  %xmm3,%xmm2
mulss  0xe7e(%rip),%xmm2
cvtss2sd %xmm2,%xmm2
lea    0xe80(%rip),%rdi
mov    $0x3,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [3 x i8] c"a=\00"
@.str.1 = [3 x i8] c"%f\00"
@.str.2 = [3 x i8] c"b=\00"
@.str.3 = [29 x i8] c"\0A( %.1f + %.1f ) / 2 = %.1f\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca float
%7 = alloca float
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%8 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
%9 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), float* %6)
%10 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0))
%11 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), float* %7)
%12 = load float, float* %6
%13 = fpext float %12 to double
%14 = load float, float* %7
%15 = fpext float %14 to double
%16 = load float, float* %6
%17 = load float, float* %7
%18 = fadd float %16, %17
%19 = fdiv float %18, 2.000000e+00
%20 = fpext float %19 to double
%21 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str.3, i64 0, i64 0), double %13, double %15, double %20)
ret i32 0
}

LLVM IR (-O2):
@.str = [3 x i8] c"a=\00"
@.str.1 = [3 x i8] c"%f\00"
@.str.2 = [3 x i8] c"b=\00"
@.str.3 = [29 x i8] c"\0A( %.1f + %.1f ) / 2 = %.1f\0A\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = alloca float
%4 = alloca float
%5 = bitcast float* %3 to i8*
%6 = bitcast float* %4 to i8*
%7 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
%8 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), float* %3)
%9 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0))
%10 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), float* %4)
%11 = load float, float* %3
%12 = fpext float %11 to double
%13 = load float, float* %4
%14 = fpext float %13 to double
%15 = fadd float %11, %13
%16 = fmul float %15, 5.000000e-01
%17 = fpext float %16 to double
%18 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([29 x i8], [29 x i8]* @.str.3, i64 0, i64 0), double %12, double %14, double %17)
ret i32 0
}