d00d74bb25
add `GenericFloatingPointPredicateUtils` in order to generalize effects of floating point comparisons on `KnownFPClass` for both IR and MIR. --------- Co-authored-by: Matt Arsenault <arsenm2@gmail.com>
47 lines
1.7 KiB
C++
47 lines
1.7 KiB
C++
//===-- MachineFloatingPointModeUtils.h -----*- 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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#ifndef LLVM_CODEGEN_MACHINEFLOATINGPOINTPREDICATEUTILS_H
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#define LLVM_CODEGEN_MACHINEFLOATINGPOINTPREDICATEUTILS_H
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#include "llvm/ADT/GenericFloatingPointPredicateUtils.h"
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#include "llvm/CodeGen/MachineSSAContext.h"
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namespace llvm {
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using MachineFloatingPointPredicateUtils =
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GenericFloatingPointPredicateUtils<MachineSSAContext>;
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/// Compute the possible floating-point classes that \p LHS could be based on
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/// fcmp \Pred \p LHS, \p RHS.
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///
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/// \returns { TestedValue, ClassesIfTrue, ClassesIfFalse }
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///
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/// If the compare returns an exact class test, ClassesIfTrue ==
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/// ~ClassesIfFalse
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///
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/// This is a less exact version of fcmpToClassTest (e.g. fcmpToClassTest will
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/// only succeed for a test of x > 0 implies positive, but not x > 1).
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///
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/// If \p LookThroughSrc is true, consider the input value when computing the
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/// mask. This may look through sign bit operations.
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///
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/// If \p LookThroughSrc is false, ignore the source value (i.e. the first
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/// pair element will always be LHS.
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///
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inline std::tuple<Register, FPClassTest, FPClassTest>
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fcmpImpliesClass(CmpInst::Predicate Pred, const MachineFunction &MF,
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Register LHS, Register RHS, bool LookThroughSrc = true) {
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return MachineFloatingPointPredicateUtils::fcmpImpliesClass(
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Pred, MF, LHS, RHS, LookThroughSrc);
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}
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} // namespace llvm
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#endif // LLVM_CODEGEN_MACHINEFLOATINGPOINTPREDICATEUTILS_H
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