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| //===- llvm/MC/LaneBitmask.h ------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// A common definition of LaneBitmask for use in TableGen and CodeGen.
///
/// A lane mask is a bitmask representing the covering of a register with
/// sub-registers.
///
/// This is typically used to track liveness at sub-register granularity.
/// Lane masks for sub-register indices are similar to register units for
/// physical registers. The individual bits in a lane mask can't be assigned
/// any specific meaning. They can be used to check if two sub-register
/// indices overlap.
///
/// Iff the target has a register such that:
///
/// getSubReg(Reg, A) overlaps getSubReg(Reg, B)
///
/// then:
///
/// (getSubRegIndexLaneMask(A) & getSubRegIndexLaneMask(B)) != 0
#ifndef LLVM_MC_LANEBITMASK_H
#define LLVM_MC_LANEBITMASK_H
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/Printable.h"
#include "llvm/Support/raw_ostream.h"
namespace llvm {
struct LaneBitmask {
// When changing the underlying type, change the format string as well.
using Type = unsigned;
enum : unsigned { BitWidth = 8*sizeof(Type) };
constexpr static const char *const FormatStr = "%08X";
constexpr LaneBitmask() = default;
explicit constexpr LaneBitmask(Type V) : Mask(V) {}
constexpr bool operator== (LaneBitmask M) const { return Mask == M.Mask; }
constexpr bool operator!= (LaneBitmask M) const { return Mask != M.Mask; }
constexpr bool operator< (LaneBitmask M) const { return Mask < M.Mask; }
constexpr bool none() const { return Mask == 0; }
constexpr bool any() const { return Mask != 0; }
constexpr bool all() const { return ~Mask == 0; }
constexpr LaneBitmask operator~() const {
return LaneBitmask(~Mask);
}
constexpr LaneBitmask operator|(LaneBitmask M) const {
return LaneBitmask(Mask | M.Mask);
}
constexpr LaneBitmask operator&(LaneBitmask M) const {
return LaneBitmask(Mask & M.Mask);
}
LaneBitmask &operator|=(LaneBitmask M) {
Mask |= M.Mask;
return *this;
}
LaneBitmask &operator&=(LaneBitmask M) {
Mask &= M.Mask;
return *this;
}
constexpr Type getAsInteger() const { return Mask; }
unsigned getNumLanes() const {
return countPopulation(Mask);
}
unsigned getHighestLane() const {
return Log2_32(Mask);
}
static constexpr LaneBitmask getNone() { return LaneBitmask(0); }
static constexpr LaneBitmask getAll() { return ~LaneBitmask(0); }
static constexpr LaneBitmask getLane(unsigned Lane) {
return LaneBitmask(Type(1) << Lane);
}
private:
Type Mask = 0;
};
/// Create Printable object to print LaneBitmasks on a \ref raw_ostream.
inline Printable PrintLaneMask(LaneBitmask LaneMask) {
return Printable([LaneMask](raw_ostream &OS) {
OS << format(LaneBitmask::FormatStr, LaneMask.getAsInteger());
});
}
} // end namespace llvm
#endif // LLVM_MC_LANEBITMASK_H
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