third_party/llvm-project/clang-tools-extra/test/clang-tidy/bugprone-incorrect-roundings.cpp

// RUN: %check_clang_tidy %s bugprone-incorrect-roundings %t

void b(int x) {}

void f1() {
  float f;
  double d;
  long double ld;
  int x;

  x = (d + 0.5);
  // CHECK-MESSAGES: [[@LINE-1]]:7: warning: casting (double + 0.5) to integer leads to incorrect rounding; consider using lround (#include <cmath>) instead [bugprone-incorrect-roundings]
  x = (d + 0.5f);
  // CHECK-MESSAGES: [[@LINE-1]]:7: warning: casting (double + 0.5)
  x = (f + 0.5);
  // CHECK-MESSAGES: [[@LINE-1]]:7: warning: casting (double + 0.5)
  x = (f + 0.5f);
  // CHECK-MESSAGES: [[@LINE-1]]:7: warning: casting (double + 0.5)
  x = (0.5 + d);
  // CHECK-MESSAGES: [[@LINE-1]]:7: warning: casting (double + 0.5)
  x = (0.5f + d);
  // CHECK-MESSAGES: [[@LINE-1]]:7: warning: casting (double + 0.5)
  x = (0.5 + ld);
  // CHECK-MESSAGES: [[@LINE-1]]:7: warning: casting (double + 0.5)
  x = (0.5f + ld);
  // CHECK-MESSAGES: [[@LINE-1]]:7: warning: casting (double + 0.5)
  x = (0.5 + f);
  // CHECK-MESSAGES: [[@LINE-1]]:7: warning: casting (double + 0.5)
  x = (0.5f + f);
  // CHECK-MESSAGES: [[@LINE-1]]:7: warning: casting (double + 0.5)
  x = (int)(d + 0.5);
  // CHECK-MESSAGES: [[@LINE-1]]:12: warning: casting (double + 0.5)
  x = (int)(d + 0.5f);
  // CHECK-MESSAGES: [[@LINE-1]]:12: warning: casting (double + 0.5)
  x = (int)(ld + 0.5);
  // CHECK-MESSAGES: [[@LINE-1]]:12: warning: casting (double + 0.5)
  x = (int)(ld + 0.5f);
  // CHECK-MESSAGES: [[@LINE-1]]:12: warning: casting (double + 0.5)
  x = (int)(f + 0.5);
  // CHECK-MESSAGES: [[@LINE-1]]:12: warning: casting (double + 0.5)
  x = (int)(f + 0.5f);
  // CHECK-MESSAGES: [[@LINE-1]]:12: warning: casting (double + 0.5)
  x = (int)(0.5 + d);
  // CHECK-MESSAGES: [[@LINE-1]]:12: warning: casting (double + 0.5)
  x = (int)(0.5f + d);
  // CHECK-MESSAGES: [[@LINE-1]]:12: warning: casting (double + 0.5)
  x = (int)(0.5 + ld);
  // CHECK-MESSAGES: [[@LINE-1]]:12: warning: casting (double + 0.5)
  x = (int)(0.5f + ld);
  // CHECK-MESSAGES: [[@LINE-1]]:12: warning: casting (double + 0.5)
  x = (int)(0.5 + f);
  // CHECK-MESSAGES: [[@LINE-1]]:12: warning: casting (double + 0.5)
  x = (int)(0.5f + f);
  // CHECK-MESSAGES: [[@LINE-1]]:12: warning: casting (double + 0.5)
  x = static_cast<int>(d + 0.5);
  // CHECK-MESSAGES: [[@LINE-1]]:24: warning: casting (double + 0.5)
  x = static_cast<int>(d + 0.5f);
  // CHECK-MESSAGES: [[@LINE-1]]:24: warning: casting (double + 0.5)
  x = static_cast<int>(ld + 0.5);
  // CHECK-MESSAGES: [[@LINE-1]]:24: warning: casting (double + 0.5)
  x = static_cast<int>(ld + 0.5f);
  // CHECK-MESSAGES: [[@LINE-1]]:24: warning: casting (double + 0.5)
  x = static_cast<int>(f + 0.5);
  // CHECK-MESSAGES: [[@LINE-1]]:24: warning: casting (double + 0.5)
  x = static_cast<int>(f + 0.5f);
  // CHECK-MESSAGES: [[@LINE-1]]:24: warning: casting (double + 0.5)
  x = static_cast<int>(0.5 + d);
  // CHECK-MESSAGES: [[@LINE-1]]:24: warning: casting (double + 0.5)
  x = static_cast<int>(0.5f + d);
  // CHECK-MESSAGES: [[@LINE-1]]:24: warning: casting (double + 0.5)
  x = static_cast<int>(0.5 + ld);
  // CHECK-MESSAGES: [[@LINE-1]]:24: warning: casting (double + 0.5)
  x = static_cast<int>(0.5f + ld);
  // CHECK-MESSAGES: [[@LINE-1]]:24: warning: casting (double + 0.5)
  x = static_cast<int>(0.5 + f);
  // CHECK-MESSAGES: [[@LINE-1]]:24: warning: casting (double + 0.5)
  x = static_cast<int>(0.5f + f);
  // CHECK-MESSAGES: [[@LINE-1]]:24: warning: casting (double + 0.5)

  // Don't warn if constant is not 0.5.
  x = (int)(d + 0.6);
  x = (int)(0.6 + d);

  // Don't warn if binary operator is not directly beneath cast.
  x = (int)(1 + (0.5 + f));
}