6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
88 lines
3.1 KiB
C++
88 lines
3.1 KiB
C++
//===- FPEnv.h ---- FP Environment ------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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/// @file
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/// This file contains the declarations of entities that describe floating
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/// point environment and related functions.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_IR_FPENV_H
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#define LLVM_IR_FPENV_H
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#include "llvm/ADT/FloatingPointMode.h"
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#include "llvm/IR/FMF.h"
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#include <optional>
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namespace llvm {
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class StringRef;
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namespace Intrinsic {
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typedef unsigned ID;
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}
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class Instruction;
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namespace fp {
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/// Exception behavior used for floating point operations.
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///
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/// Each of these values correspond to some metadata argument value of a
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/// constrained floating point intrinsic. See the LLVM Language Reference Manual
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/// for details.
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enum ExceptionBehavior : uint8_t {
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ebIgnore, ///< This corresponds to "fpexcept.ignore".
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ebMayTrap, ///< This corresponds to "fpexcept.maytrap".
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ebStrict ///< This corresponds to "fpexcept.strict".
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};
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}
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/// Returns a valid RoundingMode enumerator when given a string
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/// that is valid as input in constrained intrinsic rounding mode
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/// metadata.
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std::optional<RoundingMode> convertStrToRoundingMode(StringRef);
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/// For any RoundingMode enumerator, returns a string valid as input in
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/// constrained intrinsic rounding mode metadata.
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std::optional<StringRef> convertRoundingModeToStr(RoundingMode);
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/// Returns a valid ExceptionBehavior enumerator when given a string
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/// valid as input in constrained intrinsic exception behavior metadata.
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std::optional<fp::ExceptionBehavior> convertStrToExceptionBehavior(StringRef);
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/// For any ExceptionBehavior enumerator, returns a string valid as
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/// input in constrained intrinsic exception behavior metadata.
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std::optional<StringRef> convertExceptionBehaviorToStr(fp::ExceptionBehavior);
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/// Returns true if the exception handling behavior and rounding mode
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/// match what is used in the default floating point environment.
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inline bool isDefaultFPEnvironment(fp::ExceptionBehavior EB, RoundingMode RM) {
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return EB == fp::ebIgnore && RM == RoundingMode::NearestTiesToEven;
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}
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/// Returns constrained intrinsic id to represent the given instruction in
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/// strictfp function. If the instruction is already a constrained intrinsic or
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/// does not have a constrained intrinsic counterpart, the function returns
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/// zero.
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Intrinsic::ID getConstrainedIntrinsicID(const Instruction &Instr);
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/// Returns true if the rounding mode RM may be QRM at compile time or
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/// at run time.
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inline bool canRoundingModeBe(RoundingMode RM, RoundingMode QRM) {
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return RM == QRM || RM == RoundingMode::Dynamic;
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}
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/// Returns true if the possibility of a signaling NaN can be safely
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/// ignored.
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inline bool canIgnoreSNaN(fp::ExceptionBehavior EB, FastMathFlags FMF) {
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return (EB == fp::ebIgnore || FMF.noNaNs());
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}
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}
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#endif
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