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Extract LaneBitmask into a separate type
Specifically avoid implicit conversions from/to integral types to avoid potential errors when changing the underlying type. For example, a typical initialization of a "full" mask was "LaneMask = ~0u", which would result in a value of 0x00000000FFFFFFFF if the type was extended to uint64_t. Differential Revision: https://reviews.llvm.org/D27454 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@289820 91177308-0d34-0410-b5e6-96231b3b80d8
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Krzysztof Parzyszek
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Dec 15, 2016
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| //===-- llvm/MC/LaneBitmask.h -----------------------------------*- C++ -*-===// | ||
| // | ||
| // The LLVM Compiler Infrastructure | ||
| // | ||
| // This file is distributed under the University of Illinois Open Source | ||
| // License. See LICENSE.TXT for details. | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
| /// | ||
| /// \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 | ||
|
|
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| #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. | ||
| typedef unsigned Type; | ||
| enum : unsigned { BitWidth = 8*sizeof(Type) }; | ||
| constexpr static const char *const FormatStr = "%08X"; | ||
|
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| constexpr LaneBitmask() = default; | ||
| explicit constexpr LaneBitmask(Type V) : Mask(V) {} | ||
|
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| 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 all() const { return ~Mask == 0; } | ||
|
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| 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; | ||
| } | ||
|
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| constexpr Type getAsInteger() const { return Mask; } | ||
|
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| static LaneBitmask getNone() { return LaneBitmask(0); } | ||
| static LaneBitmask getAll() { return ~LaneBitmask(0); } | ||
|
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| private: | ||
| Type Mask = 0; | ||
| }; | ||
|
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| /// Create Printable object to print LaneBitmasks on a \ref raw_ostream. | ||
| static LLVM_ATTRIBUTE_UNUSED Printable PrintLaneMask(LaneBitmask LaneMask) { | ||
| return Printable([LaneMask](raw_ostream &OS) { | ||
| OS << format(LaneBitmask::FormatStr, LaneMask.getAsInteger()); | ||
| }); | ||
| } | ||
| } | ||
|
|
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| #endif // LLVM_MC_LANEBITMASK_H |
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