#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 inches = 0.0f;
  float centimetres = 0.0f;
  printf("How many inches: ");
  scanf("%f", &inches);
  centimetres = inches * 2.54;
  printf("Centimetres: %f\n", centimetres);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
xorps  %xmm0,%xmm0
movss  %xmm0,-0x8(%rbp)
xorps  %xmm0,%xmm0
movss  %xmm0,-0xc(%rbp)
lea    0xec2(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xec6(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
movss  -0x8(%rbp),%xmm0
cvtss2sd %xmm0,%xmm0
movsd  0xe92(%rip),%xmm1
mulsd  %xmm1,%xmm0
cvtsd2ss %xmm0,%xmm0
movss  %xmm0,-0xc(%rbp)
movss  -0xc(%rbp),%xmm0
cvtss2sd %xmm0,%xmm0
lea    0xe92(%rip),%rdi
mov    $0x1,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
movl   $0x0,0x4(%rsp)
lea    0xed8(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xedc(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1040 <scanf@plt>
movss  0x4(%rsp),%xmm0
cvtss2sd %xmm0,%xmm0
mulsd  0xea6(%rip),%xmm0
cvtsd2ss %xmm0,%xmm0
cvtss2sd %xmm0,%xmm0
lea    0xeb4(%rip),%rdi
mov    $0x1,%al
call   1030 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [18 x i8] c"How many inches: \00"
@.str.1 = [3 x i8] c"%f\00"
@.str.2 = [17 x i8] c"Centimetres: %f\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca float
%3 = alloca float
store i32 0, i32* %1
store float 0.000000e+00, float* %2
store float 0.000000e+00, float* %3
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str, i64 0, i64 0))
%5 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), float* %2)
%6 = load float, float* %2
%7 = fpext float %6 to double
%8 = fmul double %7, 2.540000e+00
%9 = fptrunc double %8 to float
store float %9, float* %3
%10 = load float, float* %3
%11 = fpext float %10 to double
%12 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.2, i64 0, i64 0), double %11)
ret i32 0
}

LLVM IR (-O2):
@.str = [18 x i8] c"How many inches: \00"
@.str.1 = [3 x i8] c"%f\00"
@.str.2 = [17 x i8] c"Centimetres: %f\0A\00"
define i32 @main() {
%1 = alloca float
%2 = bitcast float* %1 to i8*
store float 0.000000e+00, float* %1
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([18 x i8], [18 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 = fpext float %5 to double
%7 = fmul double %6, 2.540000e+00
%8 = fptrunc double %7 to float
%9 = fpext float %8 to double
%10 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([17 x i8], [17 x i8]* @.str.2, i64 0, i64 0), double %9)
ret i32 0
}