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