#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 *, ...);
scalar_t__ round(double);
int main(void) {
  printf("%s\n", "Rounding Bug Example");
  printf("double:   %1.f\n", (125.85 / 41.95));
  printf("int cast: %d\n", (int)((125.85 / 41.95)));
  printf("round() : %d\n", (int)round((125.85 / 41.95)));
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
lea    0xedd(%rip),%rdi
lea    0xeda(%rip),%rsi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xee1(%rip),%rdi
movsd  0xeb8(%rip),%xmm0
mov    $0x1,%al
call   1030 <printf@plt>
lea    0xedb(%rip),%rdi
mov    $0x2,%esi
mov    $0x0,%al
call   1030 <printf@plt>
movsd  0xe96(%rip),%xmm0
call   1040 <round@plt>
mov    %eax,%esi
lea    0xec7(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xed0(%rip),%rdi
call   1030 <puts@plt>
lea    0xed9(%rip),%rdi
movsd  0xeb4(%rip),%xmm0
mov    $0x1,%al
call   1040 <printf@plt>
lea    0xed3(%rip),%rdi
mov    $0x2,%esi
xor    %eax,%eax
call   1040 <printf@plt>
movsd  0xe92(%rip),%xmm0
call   1050 <round@plt>
lea    0xec1(%rip),%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1040 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [4 x i8] c"%s\0A\00"
@.str.1 = [21 x i8] c"Rounding Bug Example\00"
@.str.2 = [16 x i8] c"double: %1.f\0A\00"
@.str.3 = [14 x i8] c"int cast: %d\0A\00"
@.str.4 = [14 x i8] c"round() : %d\0A\00"
define i32 @main() {
%1 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.1, i64 0, i64 0))
%2 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.2, i64 0, i64 0), double 0x4007FFFFFFFFFFFF)
%3 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.3, i64 0, i64 0), i32 2)
%4 = call i64 @round(double 0x4007FFFFFFFFFFFF)
%5 = trunc i64 %4 to i32
%6 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.4, i64 0, i64 0), i32 %5)
ret i32 0
}

LLVM IR (-O2):
@.str.1 = [21 x i8] c"Rounding Bug Example\00"
@.str.2 = [16 x i8] c"double: %1.f\0A\00"
@.str.3 = [14 x i8] c"int cast: %d\0A\00"
@.str.4 = [14 x i8] c"round() : %d\0A\00"
define i32 @main() {
%1 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([21 x i8], [21 x i8]* @.str.1, i64 0, i64 0))
%2 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([16 x i8], [16 x i8]* @.str.2, i64 0, i64 0), double 0x4007FFFFFFFFFFFF)
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([14 x i8], [14 x i8]* @.str.3, i64 0, i64 0), i32 2)
%4 = tail call i64 @round(double 0x4007FFFFFFFFFFFF)
%5 = trunc i64 %4 to i32
%6 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([14 x i8], [14 x i8]* @.str.4, i64 0, i64 0), i32 %5)
ret i32 0
}