forked from OSchip/llvm-project
40 lines
1.4 KiB
C++
40 lines
1.4 KiB
C++
//===--- IncorrectRoundings.h - clang-tidy ----------------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_INCORRECTROUNDINGS_H_
|
|
#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_INCORRECTROUNDINGS_H_
|
|
|
|
#include "../ClangTidy.h"
|
|
|
|
namespace clang {
|
|
namespace tidy {
|
|
namespace misc {
|
|
|
|
/// \brief Checks the usage of patterns known to produce incorrect rounding.
|
|
/// Programmers often use
|
|
/// (int)(double_expression + 0.5)
|
|
/// to round the double expression to an integer. The problem with this
|
|
/// 1. It is unnecessarily slow.
|
|
/// 2. It is incorrect. The number 0.499999975 (smallest representable float
|
|
/// number below 0.5) rounds to 1.0. Even worse behavior for negative
|
|
/// numbers where both -0.5f and -1.4f both round to 0.0.
|
|
class IncorrectRoundings : public ClangTidyCheck {
|
|
public:
|
|
IncorrectRoundings(StringRef Name, ClangTidyContext *Context)
|
|
: ClangTidyCheck(Name, Context) {}
|
|
void registerMatchers(ast_matchers::MatchFinder *Finder) override;
|
|
void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
|
|
};
|
|
|
|
} // namespace misc
|
|
} // namespace tidy
|
|
} // namespace clang
|
|
|
|
#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_INCORRECTROUNDINGS_H_
|