#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 *, ...);
main() {
  float c, f;
  int max = 300, min = 0, step = 20;
  printf("华氏温度-摄氏温度转换表\n");
  f = min;
  while (f < max) {
    c = (5.0 / 9.0) * (f - 32);
    printf("%3.1f\t%3.1f\n", f, c);
    f = f + step;
  }
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x12c,-0x10(%rbp)
movl   $0x0,-0x14(%rbp)
movl   $0x14,-0x18(%rbp)
lea    0xed1(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
cvtsi2ssl -0x14(%rbp),%xmm0
movss  %xmm0,-0xc(%rbp)
movss  -0xc(%rbp),%xmm1
cvtsi2ssl -0x10(%rbp),%xmm0
ucomiss %xmm1,%xmm0
jbe    11c1 <main+0xb1>
movss  -0xc(%rbp),%xmm0
movss  0xe9c(%rip),%xmm1
subss  %xmm1,%xmm0
cvtss2sd %xmm0,%xmm1
movsd  0xe84(%rip),%xmm0
mulsd  %xmm1,%xmm0
cvtsd2ss %xmm0,%xmm0
movss  %xmm0,-0x8(%rbp)
movss  -0xc(%rbp),%xmm0
cvtss2sd %xmm0,%xmm0
movss  -0x8(%rbp),%xmm1
cvtss2sd %xmm1,%xmm1
lea    0xe8e(%rip),%rdi
mov    $0x2,%al
call   1030 <printf@plt>
movss  -0xc(%rbp),%xmm0
cvtsi2ssl -0x18(%rbp),%xmm1
addss  %xmm1,%xmm0
movss  %xmm0,-0xc(%rbp)
jmp    114c <main+0x3c>
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %rbx
push   %rax
lea    0xef3(%rip),%rdi
call   1030 <puts@plt>
mov    $0xffffffec,%ebp
lea    0xed5(%rip),%rbx
nopl   0x0(%rax,%rax,1)
add    $0x14,%ebp
xorps  %xmm1,%xmm1
cvtsi2ss %ebp,%xmm1
xorps  %xmm0,%xmm0
cvtss2sd %xmm1,%xmm0
addss  0xea7(%rip),%xmm1
cvtss2sd %xmm1,%xmm1
mulsd  0xea3(%rip),%xmm1
cvtsd2ss %xmm1,%xmm1
cvtss2sd %xmm1,%xmm1
mov    %rbx,%rdi
mov    $0x2,%al
call   1040 <printf@plt>
cmp    $0x118,%ebp
jb     1140 <main+0x20>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@.str = [36 x i8] c"\E5\8D\8E\E6\B0\8F\E6\B8\A9\E5\BA\A6-\E6\91\84\E6\B0\8F\E6\B8\A9\E5\BA\A6\E8\BD\AC\E6\8D\A2\E8\A1\A8\0A\00"
@.str.1 = [13 x i8] c"%3.1f\09%3.1f\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca float
%3 = alloca float
%4 = alloca i32
%5 = alloca i32
%6 = alloca i32
store i32 0, i32* %1
store i32 300, i32* %4
store i32 0, i32* %5
store i32 20, i32* %6
%7 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([36 x i8], [36 x i8]* @.str, i64 0, i64 0))
%8 = load i32, i32* %5
%9 = sitofp i32 %8 to float
store float %9, float* %3
br label %10
10: ; preds = %15, %0
%11 = load float, float* %3
%12 = load i32, i32* %4
%13 = sitofp i32 %12 to float
%14 = fcmp olt float %11, %13
br i1 %14, label %15, label %30
15: ; preds = %10
%16 = load float, float* %3
%17 = fsub float %16, 3.200000e+01
%18 = fpext float %17 to double
%19 = fmul double 0x3FE1C71C71C71C72, %18
%20 = fptrunc double %19 to float
store float %20, float* %2
%21 = load float, float* %3
%22 = fpext float %21 to double
%23 = load float, float* %2
%24 = fpext float %23 to double
%25 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.1, i64 0, i64 0), double %22, double %24)
%26 = load float, float* %3
%27 = load i32, i32* %6
%28 = sitofp i32 %27 to float
%29 = fadd float %26, %28
store float %29, float* %3
br label %10
30: ; preds = %10
%31 = load i32, i32* %1
ret i32 %31
}

LLVM IR (-O2):
@.str.1 = [13 x i8] c"%3.1f\09%3.1f\0A\00"
@str = [35 x i8] c"\E5\8D\8E\E6\B0\8F\E6\B8\A9\E5\BA\A6-\E6\91\84\E6\B0\8F\E6\B8\A9\E5\BA\A6\E8\BD\AC\E6\8D\A2\E8\A1\A8\00"
define i32 @main() {
%1 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([35 x i8], [35 x i8]* @str, i64 0, i64 0))
br label %2
2: ; preds = %0, %2
%3 = phi i32 [ 0, %0 ], [ %12, %2 ]
%4 = sitofp i32 %3 to float
%5 = fadd float %4, -3.200000e+01
%6 = fpext float %5 to double
%7 = fmul double %6, 0x3FE1C71C71C71C72
%8 = fptrunc double %7 to float
%9 = fpext float %4 to double
%10 = fpext float %8 to double
%11 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str.1, i64 0, i64 0), double %9, double %10)
%12 = add nuw nsw i32 %3, 20
%13 = icmp ult i32 %3, 280
br i1 %13, label %2, label %14
14: ; preds = %2
ret i32 0
}