[llvm] [IR] Add new Range attribute using new ConstantRange Attribute type (PR #83171)
Andreas Jonson via llvm-commits
llvm-commits at lists.llvm.org
Tue Feb 27 11:39:46 PST 2024
https://github.com/andjo403 updated https://github.com/llvm/llvm-project/pull/83171
>From 3c8ef542ec59c24840c2077b701d064a5ce65fc5 Mon Sep 17 00:00:00 2001
From: Andreas Jonson <andjo403 at hotmail.com>
Date: Tue, 27 Feb 2024 20:37:31 +0100
Subject: [PATCH] [IR] Add new Range attribute using new ConstantRange
Attribute type
---
llvm/docs/LangRef.rst | 18 +++++
llvm/include/llvm/ADT/FoldingSet.h | 7 ++
llvm/include/llvm/AsmParser/LLParser.h | 1 +
llvm/include/llvm/Bitcode/LLVMBitCodes.h | 1 +
llvm/include/llvm/IR/Attributes.h | 23 ++++++
llvm/include/llvm/IR/Attributes.td | 6 ++
llvm/lib/AsmParser/LLParser.cpp | 50 ++++++++++++
llvm/lib/Bitcode/Reader/BitcodeReader.cpp | 30 +++++++
llvm/lib/Bitcode/Writer/BitcodeWriter.cpp | 59 +++++++++-----
llvm/lib/IR/AttributeImpl.h | 28 ++++++-
llvm/lib/IR/Attributes.cpp | 80 ++++++++++++++++++-
llvm/lib/IR/Verifier.cpp | 5 ++
llvm/lib/Transforms/Utils/CodeExtractor.cpp | 1 +
.../test/Assembler/range-attribute-invalid.ll | 8 ++
llvm/test/Bitcode/attributes.ll | 10 +++
llvm/test/Verifier/range-attr.ll | 11 +++
llvm/utils/TableGen/Attributes.cpp | 9 ++-
17 files changed, 321 insertions(+), 26 deletions(-)
create mode 100644 llvm/test/Assembler/range-attribute-invalid.ll
create mode 100644 llvm/test/Verifier/range-attr.ll
diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst
index 60e682ae328a8f..425013c581b378 100644
--- a/llvm/docs/LangRef.rst
+++ b/llvm/docs/LangRef.rst
@@ -1634,6 +1634,24 @@ Currently, only the following parameter attributes are defined:
This attribute cannot be applied to return values.
+``range(<ty>,<a>,<b>)``
+ This attribute expresses the possible range the parameter is in. If the
+ value of the parameter is not in the specified range, a poison value is
+ returned instead.
+ The argument passed to ``range`` has the following properties:
+
+- The type must match the scalar type of the parameter.
+- The pair ``a,b`` represents the range ``[a,b)``.
+- Both ``a`` and ``b`` are constants.
+- The range is allowed to wrap.
+- The range should not represent the full or empty set. That is,
+ ``a!=b``.
+
+ This attribute may only be applied to parameters with integer or vector of
+ integer types.
+
+ For vector-typed parameters, the range is applied element-wise.
+
.. _gc:
Garbage Collector Strategy Names
diff --git a/llvm/include/llvm/ADT/FoldingSet.h b/llvm/include/llvm/ADT/FoldingSet.h
index f82eabd5044b22..55f56a224cb446 100644
--- a/llvm/include/llvm/ADT/FoldingSet.h
+++ b/llvm/include/llvm/ADT/FoldingSet.h
@@ -16,6 +16,7 @@
#ifndef LLVM_ADT_FOLDINGSET_H
#define LLVM_ADT_FOLDINGSET_H
+#include "llvm/ADT/APInt.h"
#include "llvm/ADT/Hashing.h"
#include "llvm/ADT/STLForwardCompat.h"
#include "llvm/ADT/SmallVector.h"
@@ -354,6 +355,12 @@ class FoldingSetNodeID {
AddInteger(unsigned(I));
AddInteger(unsigned(I >> 32));
}
+ void AddInteger(APInt Int) {
+ const auto *Parts = Int.getRawData();
+ for (int i = 0, N = Int.getNumWords(); i < N; ++i) {
+ AddInteger(Parts[i]);
+ }
+ }
void AddBoolean(bool B) { AddInteger(B ? 1U : 0U); }
void AddString(StringRef String);
diff --git a/llvm/include/llvm/AsmParser/LLParser.h b/llvm/include/llvm/AsmParser/LLParser.h
index f07f4c61f9d649..887580c1c5893f 100644
--- a/llvm/include/llvm/AsmParser/LLParser.h
+++ b/llvm/include/llvm/AsmParser/LLParser.h
@@ -366,6 +366,7 @@ namespace llvm {
bool parseFnAttributeValuePairs(AttrBuilder &B,
std::vector<unsigned> &FwdRefAttrGrps,
bool inAttrGrp, LocTy &BuiltinLoc);
+ bool parseRangeAttr(AttrBuilder &B);
bool parseRequiredTypeAttr(AttrBuilder &B, lltok::Kind AttrToken,
Attribute::AttrKind AttrKind);
diff --git a/llvm/include/llvm/Bitcode/LLVMBitCodes.h b/llvm/include/llvm/Bitcode/LLVMBitCodes.h
index c6f0ddf29a6da8..c0a52d64a101d0 100644
--- a/llvm/include/llvm/Bitcode/LLVMBitCodes.h
+++ b/llvm/include/llvm/Bitcode/LLVMBitCodes.h
@@ -724,6 +724,7 @@ enum AttributeKindCodes {
ATTR_KIND_WRITABLE = 89,
ATTR_KIND_CORO_ONLY_DESTROY_WHEN_COMPLETE = 90,
ATTR_KIND_DEAD_ON_UNWIND = 91,
+ ATTR_KIND_RANGE = 92,
};
enum ComdatSelectionKindCodes {
diff --git a/llvm/include/llvm/IR/Attributes.h b/llvm/include/llvm/IR/Attributes.h
index a4ebe5d732f568..0c2a02514ba0e6 100644
--- a/llvm/include/llvm/IR/Attributes.h
+++ b/llvm/include/llvm/IR/Attributes.h
@@ -37,6 +37,7 @@ class AttributeMask;
class AttributeImpl;
class AttributeListImpl;
class AttributeSetNode;
+class ConstantRange;
class FoldingSetNodeID;
class Function;
class LLVMContext;
@@ -103,6 +104,9 @@ class Attribute {
static bool isTypeAttrKind(AttrKind Kind) {
return Kind >= FirstTypeAttr && Kind <= LastTypeAttr;
}
+ static bool isConstantRangeAttrKind(AttrKind Kind) {
+ return Kind >= FirstConstantRangeAttr && Kind <= LastConstantRangeAttr;
+ }
static bool canUseAsFnAttr(AttrKind Kind);
static bool canUseAsParamAttr(AttrKind Kind);
@@ -125,6 +129,8 @@ class Attribute {
static Attribute get(LLVMContext &Context, StringRef Kind,
StringRef Val = StringRef());
static Attribute get(LLVMContext &Context, AttrKind Kind, Type *Ty);
+ static Attribute get(LLVMContext &Context, AttrKind Kind,
+ const ConstantRange &CR);
/// Return a uniquified Attribute object that has the specific
/// alignment set.
@@ -180,6 +186,9 @@ class Attribute {
/// Return true if the attribute is a type attribute.
bool isTypeAttribute() const;
+ /// Return true if the attribute is a ConstantRange attribute.
+ bool isConstantRangeAttribute() const;
+
/// Return true if the attribute is any kind of attribute.
bool isValid() const { return pImpl; }
@@ -213,6 +222,10 @@ class Attribute {
/// a type attribute.
Type *getValueAsType() const;
+ /// Return the attribute's value as a ConstantRange. This requires the
+ /// attribute to be a ConstantRange attribute.
+ ConstantRange getValueAsConstantRange() const;
+
/// Returns the alignment field of an attribute as a byte alignment
/// value.
MaybeAlign getAlignment() const;
@@ -251,6 +264,9 @@ class Attribute {
/// Return the FPClassTest for nofpclass
FPClassTest getNoFPClass() const;
+ /// Returns the value of the range attribute.
+ ConstantRange getRange() const;
+
/// The Attribute is converted to a string of equivalent mnemonic. This
/// is, presumably, for writing out the mnemonics for the assembly writer.
std::string getAsString(bool InAttrGrp = false) const;
@@ -1189,6 +1205,13 @@ class AttrBuilder {
// Add nofpclass attribute
AttrBuilder &addNoFPClassAttr(FPClassTest NoFPClassMask);
+ /// Add a ConstantRange attribute with the given range.
+ AttrBuilder &addConstantRangeAttr(Attribute::AttrKind Kind,
+ const ConstantRange &CR);
+
+ /// Add range attribute.
+ AttrBuilder &addRangeAttr(const ConstantRange &CR);
+
ArrayRef<Attribute> attrs() const { return Attrs; }
bool operator==(const AttrBuilder &B) const;
diff --git a/llvm/include/llvm/IR/Attributes.td b/llvm/include/llvm/IR/Attributes.td
index 08afecf3201512..c5b68d25363282 100644
--- a/llvm/include/llvm/IR/Attributes.td
+++ b/llvm/include/llvm/IR/Attributes.td
@@ -44,6 +44,9 @@ class StrBoolAttr<string S> : Attr<S, []>;
/// Arbitrary string attribute.
class ComplexStrAttr<string S, list<AttrProperty> P> : Attr<S, P>;
+/// ConstantRange attribute.
+class ConstantRangeAttr<string S, list<AttrProperty> P> : Attr<S, P>;
+
/// Target-independent enum attributes.
/// Alignment of parameter (5 bits) stored as log2 of alignment with +1 bias.
@@ -218,6 +221,9 @@ def OptimizeNone : EnumAttr<"optnone", [FnAttr]>;
/// Similar to byval but without a copy.
def Preallocated : TypeAttr<"preallocated", [FnAttr, ParamAttr]>;
+/// Function does not access memory.
+def Range : ConstantRangeAttr<"range", [ParamAttr, RetAttr]>;
+
/// Function does not access memory.
def ReadNone : EnumAttr<"readnone", [ParamAttr]>;
diff --git a/llvm/lib/AsmParser/LLParser.cpp b/llvm/lib/AsmParser/LLParser.cpp
index a91e2f690999e0..8d2c2cabf457f3 100644
--- a/llvm/lib/AsmParser/LLParser.cpp
+++ b/llvm/lib/AsmParser/LLParser.cpp
@@ -1585,6 +1585,9 @@ bool LLParser::parseEnumAttribute(Attribute::AttrKind Attr, AttrBuilder &B,
return true;
}
+ case Attribute::Range: {
+ return parseRangeAttr(B);
+ }
default:
B.addAttribute(Attr);
Lex.Lex();
@@ -2997,6 +3000,53 @@ bool LLParser::parseRequiredTypeAttr(AttrBuilder &B, lltok::Kind AttrToken,
return false;
}
+/// parseRangeAttr
+/// ::= range(<ty>,<n>,<n>)
+bool LLParser::parseRangeAttr(AttrBuilder &B) {
+ Lex.Lex();
+
+ APInt Lower;
+ APInt Upper;
+ Type *Ty = nullptr;
+ LocTy TyLoc;
+
+ auto ParseAPSInt = [&](llvm::TypeSize BitWidth, APInt &Val) {
+ if (Lex.getKind() != lltok::APSInt)
+ return tokError("expected integer");
+ if (Lex.getAPSIntVal().getBitWidth() > BitWidth)
+ return tokError("integer is to large for the BitWidth");
+ Val = Lex.getAPSIntVal().extend(BitWidth);
+ Lex.Lex();
+ return false;
+ };
+
+ if (!EatIfPresent(lltok::lparen))
+ return tokError("expected '('");
+ if (parseType(Ty, TyLoc))
+ return true;
+ if (!Ty->isIntegerTy())
+ return error(TyLoc, "must have integer type");
+
+ auto BitWidth = Ty->getPrimitiveSizeInBits();
+
+ if (!EatIfPresent(lltok::comma))
+ return tokError("expected ','");
+ if (ParseAPSInt(BitWidth, Lower))
+ return true;
+ if (!EatIfPresent(lltok::comma))
+ return tokError("expected ','");
+ if (ParseAPSInt(BitWidth, Upper))
+ return true;
+ if (Lower == Upper)
+ return tokError("The range should not represent the full or empty set!");
+
+ if (!EatIfPresent(lltok::rparen))
+ return tokError("expected ')'");
+
+ B.addRangeAttr(ConstantRange(Lower, Upper));
+ return false;
+}
+
/// parseOptionalOperandBundles
/// ::= /*empty*/
/// ::= '[' OperandBundle [, OperandBundle ]* ']'
diff --git a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
index 832907a3f53f5f..148dcdbdf221dc 100644
--- a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -2103,6 +2103,8 @@ static Attribute::AttrKind getAttrFromCode(uint64_t Code) {
return Attribute::CoroDestroyOnlyWhenComplete;
case bitc::ATTR_KIND_DEAD_ON_UNWIND:
return Attribute::DeadOnUnwind;
+ case bitc::ATTR_KIND_RANGE:
+ return Attribute::Range;
}
}
@@ -2272,6 +2274,34 @@ Error BitcodeReader::parseAttributeGroupBlock() {
return error("Not a type attribute");
B.addTypeAttr(Kind, HasType ? getTypeByID(Record[++i]) : nullptr);
+ } else if (Record[i] == 7 || Record[i] == 8) {
+ bool WideAPInt = Record[i++] == 8;
+ Attribute::AttrKind Kind;
+ if (Error Err = parseAttrKind(Record[i++], &Kind))
+ return Err;
+ if (!Attribute::isConstantRangeAttrKind(Kind))
+ return error("Not a ConstantRange attribute");
+
+ unsigned ValueBitWidth = Record[i++];
+ unsigned ActiveWords = 1;
+ if (WideAPInt)
+ ActiveWords = Record[i++];
+ APInt Lower =
+ readWideAPInt(ArrayRef(&Record[i], ActiveWords), ValueBitWidth);
+ i += ActiveWords;
+ ActiveWords = 1;
+ if (WideAPInt)
+ ActiveWords = Record[i++];
+ APInt Upper =
+ readWideAPInt(ArrayRef(&Record[i], ActiveWords), ValueBitWidth);
+ i += ActiveWords - 1;
+
+ if (Lower == Upper)
+ return error(
+ "The range should not represent the full or empty set!");
+
+ ConstantRange Range(Lower, Upper);
+ B.addConstantRangeAttr(Kind, Range);
} else {
return error("Invalid attribute group entry");
}
diff --git a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
index 656f2a6ce870f5..d12f959861a748 100644
--- a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -844,6 +844,8 @@ static uint64_t getAttrKindEncoding(Attribute::AttrKind Kind) {
return bitc::ATTR_KIND_CORO_ONLY_DESTROY_WHEN_COMPLETE;
case Attribute::DeadOnUnwind:
return bitc::ATTR_KIND_DEAD_ON_UNWIND;
+ case Attribute::Range:
+ return bitc::ATTR_KIND_RANGE;
case Attribute::EndAttrKinds:
llvm_unreachable("Can not encode end-attribute kinds marker.");
case Attribute::None:
@@ -856,6 +858,24 @@ static uint64_t getAttrKindEncoding(Attribute::AttrKind Kind) {
llvm_unreachable("Trying to encode unknown attribute");
}
+static void emitSignedInt64(SmallVectorImpl<uint64_t> &Vals, uint64_t V) {
+ if ((int64_t)V >= 0)
+ Vals.push_back(V << 1);
+ else
+ Vals.push_back((-V << 1) | 1);
+}
+
+static void emitWideAPInt(SmallVectorImpl<uint64_t> &Vals, const APInt &A) {
+ // We have an arbitrary precision integer value to write whose
+ // bit width is > 64. However, in canonical unsigned integer
+ // format it is likely that the high bits are going to be zero.
+ // So, we only write the number of active words.
+ unsigned NumWords = A.getActiveWords();
+ const uint64_t *RawData = A.getRawData();
+ for (unsigned i = 0; i < NumWords; i++)
+ emitSignedInt64(Vals, RawData[i]);
+}
+
void ModuleBitcodeWriter::writeAttributeGroupTable() {
const std::vector<ValueEnumerator::IndexAndAttrSet> &AttrGrps =
VE.getAttributeGroups();
@@ -889,13 +909,30 @@ void ModuleBitcodeWriter::writeAttributeGroupTable() {
Record.append(Val.begin(), Val.end());
Record.push_back(0);
}
- } else {
- assert(Attr.isTypeAttribute());
+ } else if (Attr.isTypeAttribute()) {
Type *Ty = Attr.getValueAsType();
Record.push_back(Ty ? 6 : 5);
Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum()));
if (Ty)
Record.push_back(VE.getTypeID(Attr.getValueAsType()));
+ } else {
+ assert(Attr.isConstantRangeAttribute());
+ ConstantRange Range = Attr.getValueAsConstantRange();
+ bool WideAPInt = Range.getBitWidth() > 64;
+ Record.push_back(WideAPInt ? 8 : 7);
+ Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum()));
+ Record.push_back(Range.getBitWidth());
+ if (WideAPInt) {
+ const APInt &Lower = Range.getLower();
+ Record.push_back(Lower.getActiveWords());
+ emitWideAPInt(Record, Lower);
+ const APInt &Upper = Range.getUpper();
+ Record.push_back(Upper.getActiveWords());
+ emitWideAPInt(Record, Upper);
+ } else {
+ emitSignedInt64(Record, *Range.getLower().getRawData());
+ emitSignedInt64(Record, *Range.getUpper().getRawData());
+ }
}
}
@@ -1716,24 +1753,6 @@ void ModuleBitcodeWriter::writeDIGenericSubrange(
Record.clear();
}
-static void emitSignedInt64(SmallVectorImpl<uint64_t> &Vals, uint64_t V) {
- if ((int64_t)V >= 0)
- Vals.push_back(V << 1);
- else
- Vals.push_back((-V << 1) | 1);
-}
-
-static void emitWideAPInt(SmallVectorImpl<uint64_t> &Vals, const APInt &A) {
- // We have an arbitrary precision integer value to write whose
- // bit width is > 64. However, in canonical unsigned integer
- // format it is likely that the high bits are going to be zero.
- // So, we only write the number of active words.
- unsigned NumWords = A.getActiveWords();
- const uint64_t *RawData = A.getRawData();
- for (unsigned i = 0; i < NumWords; i++)
- emitSignedInt64(Vals, RawData[i]);
-}
-
void ModuleBitcodeWriter::writeDIEnumerator(const DIEnumerator *N,
SmallVectorImpl<uint64_t> &Record,
unsigned Abbrev) {
diff --git a/llvm/lib/IR/AttributeImpl.h b/llvm/lib/IR/AttributeImpl.h
index 78496786b0ae95..9a6427bbc3d557 100644
--- a/llvm/lib/IR/AttributeImpl.h
+++ b/llvm/lib/IR/AttributeImpl.h
@@ -20,6 +20,7 @@
#include "llvm/ADT/FoldingSet.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/IR/Attributes.h"
+#include "llvm/IR/ConstantRange.h"
#include "llvm/Support/TrailingObjects.h"
#include <cassert>
#include <cstddef>
@@ -46,6 +47,7 @@ class AttributeImpl : public FoldingSetNode {
IntAttrEntry,
StringAttrEntry,
TypeAttrEntry,
+ ConstantRangeAttrEntry,
};
AttributeImpl(AttrEntryKind KindID) : KindID(KindID) {}
@@ -59,6 +61,9 @@ class AttributeImpl : public FoldingSetNode {
bool isIntAttribute() const { return KindID == IntAttrEntry; }
bool isStringAttribute() const { return KindID == StringAttrEntry; }
bool isTypeAttribute() const { return KindID == TypeAttrEntry; }
+ bool isConstantRangeAttribute() const {
+ return KindID == ConstantRangeAttrEntry;
+ }
bool hasAttribute(Attribute::AttrKind A) const;
bool hasAttribute(StringRef Kind) const;
@@ -72,6 +77,8 @@ class AttributeImpl : public FoldingSetNode {
Type *getValueAsType() const;
+ ConstantRange getValueAsConstantRange() const;
+
/// Used when sorting the attributes.
bool operator<(const AttributeImpl &AI) const;
@@ -82,8 +89,10 @@ class AttributeImpl : public FoldingSetNode {
Profile(ID, getKindAsEnum(), getValueAsInt());
else if (isStringAttribute())
Profile(ID, getKindAsString(), getValueAsString());
- else
+ else if (isTypeAttribute())
Profile(ID, getKindAsEnum(), getValueAsType());
+ else
+ Profile(ID, getKindAsEnum(), getValueAsConstantRange());
}
static void Profile(FoldingSetNodeID &ID, Attribute::AttrKind Kind) {
@@ -108,6 +117,13 @@ class AttributeImpl : public FoldingSetNode {
ID.AddInteger(Kind);
ID.AddPointer(Ty);
}
+
+ static void Profile(FoldingSetNodeID &ID, Attribute::AttrKind Kind,
+ const ConstantRange &CR) {
+ ID.AddInteger(Kind);
+ ID.AddInteger(CR.getLower());
+ ID.AddInteger(CR.getUpper());
+ }
};
static_assert(std::is_trivially_destructible<AttributeImpl>::value,
@@ -196,6 +212,16 @@ class TypeAttributeImpl : public EnumAttributeImpl {
Type *getTypeValue() const { return Ty; }
};
+class ConstantRangeAttributeImpl : public EnumAttributeImpl {
+ ConstantRange CR;
+
+public:
+ ConstantRangeAttributeImpl(Attribute::AttrKind Kind, const ConstantRange &CR)
+ : EnumAttributeImpl(ConstantRangeAttrEntry, Kind), CR(CR) {}
+
+ ConstantRange getConstantRangeValue() const { return CR; }
+};
+
class AttributeBitSet {
/// Bitset with a bit for each available attribute Attribute::AttrKind.
uint8_t AvailableAttrs[12] = {};
diff --git a/llvm/lib/IR/Attributes.cpp b/llvm/lib/IR/Attributes.cpp
index 00acbbe7989d8a..6cd78641584f33 100644
--- a/llvm/lib/IR/Attributes.cpp
+++ b/llvm/lib/IR/Attributes.cpp
@@ -24,6 +24,7 @@
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/IR/AttributeMask.h"
+#include "llvm/IR/ConstantRange.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Type.h"
@@ -165,6 +166,30 @@ Attribute Attribute::get(LLVMContext &Context, Attribute::AttrKind Kind,
return Attribute(PA);
}
+Attribute Attribute::get(LLVMContext &Context, Attribute::AttrKind Kind,
+ const ConstantRange &CR) {
+ assert(Attribute::isConstantRangeAttrKind(Kind) &&
+ "Not a ConstantRange attribute");
+ LLVMContextImpl *pImpl = Context.pImpl;
+ FoldingSetNodeID ID;
+ ID.AddInteger(Kind);
+ ID.AddInteger(CR.getLower());
+ ID.AddInteger(CR.getUpper());
+
+ void *InsertPoint;
+ AttributeImpl *PA = pImpl->AttrsSet.FindNodeOrInsertPos(ID, InsertPoint);
+
+ if (!PA) {
+ // If we didn't find any existing attributes of the same shape then create a
+ // new one and insert it.
+ PA = new (pImpl->Alloc) ConstantRangeAttributeImpl(Kind, CR);
+ pImpl->AttrsSet.InsertNode(PA, InsertPoint);
+ }
+
+ // Return the Attribute that we found or created.
+ return Attribute(PA);
+}
+
Attribute Attribute::getWithAlignment(LLVMContext &Context, Align A) {
assert(A <= llvm::Value::MaximumAlignment && "Alignment too large.");
return get(Context, Alignment, A.value());
@@ -287,9 +312,14 @@ bool Attribute::isTypeAttribute() const {
return pImpl && pImpl->isTypeAttribute();
}
+bool Attribute::isConstantRangeAttribute() const {
+ return pImpl && pImpl->isConstantRangeAttribute();
+}
+
Attribute::AttrKind Attribute::getKindAsEnum() const {
if (!pImpl) return None;
- assert((isEnumAttribute() || isIntAttribute() || isTypeAttribute()) &&
+ assert((isEnumAttribute() || isIntAttribute() || isTypeAttribute() ||
+ isConstantRangeAttribute()) &&
"Invalid attribute type to get the kind as an enum!");
return pImpl->getKindAsEnum();
}
@@ -329,6 +359,11 @@ Type *Attribute::getValueAsType() const {
return pImpl->getValueAsType();
}
+ConstantRange Attribute::getValueAsConstantRange() const {
+ assert(isConstantRangeAttribute() &&
+ "Invalid attribute type to get the value as a ConstantRange!");
+ return pImpl->getValueAsConstantRange();
+}
bool Attribute::hasAttribute(AttrKind Kind) const {
return (pImpl && pImpl->hasAttribute(Kind)) || (!pImpl && Kind == None);
@@ -408,6 +443,12 @@ FPClassTest Attribute::getNoFPClass() const {
return static_cast<FPClassTest>(pImpl->getValueAsInt());
}
+ConstantRange Attribute::getRange() const {
+ assert(hasAttribute(Attribute::Range) &&
+ "Trying to get range args from non-range attribute");
+ return pImpl->getValueAsConstantRange();
+}
+
static const char *getModRefStr(ModRefInfo MR) {
switch (MR) {
case ModRefInfo::NoModRef:
@@ -562,6 +603,18 @@ std::string Attribute::getAsString(bool InAttrGrp) const {
return Result;
}
+ if (hasAttribute(Attribute::Range)) {
+ std::string Result;
+ raw_string_ostream OS(Result);
+ ConstantRange CR = getValueAsConstantRange();
+ OS << "range(";
+ OS << "i" << CR.getBitWidth() << ",";
+ OS << CR.getLower() << "," << CR.getUpper();
+ OS << ")";
+ OS.flush();
+ return Result;
+ }
+
// Convert target-dependent attributes to strings of the form:
//
// "kind"
@@ -651,7 +704,8 @@ bool AttributeImpl::hasAttribute(StringRef Kind) const {
}
Attribute::AttrKind AttributeImpl::getKindAsEnum() const {
- assert(isEnumAttribute() || isIntAttribute() || isTypeAttribute());
+ assert(isEnumAttribute() || isIntAttribute() || isTypeAttribute() ||
+ isConstantRangeAttribute());
return static_cast<const EnumAttributeImpl *>(this)->getEnumKind();
}
@@ -680,6 +734,12 @@ Type *AttributeImpl::getValueAsType() const {
return static_cast<const TypeAttributeImpl *>(this)->getTypeValue();
}
+ConstantRange AttributeImpl::getValueAsConstantRange() const {
+ assert(isConstantRangeAttribute());
+ return static_cast<const ConstantRangeAttributeImpl *>(this)
+ ->getConstantRangeValue();
+}
+
bool AttributeImpl::operator<(const AttributeImpl &AI) const {
if (this == &AI)
return false;
@@ -693,6 +753,7 @@ bool AttributeImpl::operator<(const AttributeImpl &AI) const {
return getKindAsEnum() < AI.getKindAsEnum();
assert(!AI.isEnumAttribute() && "Non-unique attribute");
assert(!AI.isTypeAttribute() && "Comparison of types would be unstable");
+ assert(!AI.isConstantRangeAttribute() && "Unclear how to compare ranges");
// TODO: Is this actually needed?
assert(AI.isIntAttribute() && "Only possibility left");
return getValueAsInt() < AI.getValueAsInt();
@@ -1881,6 +1942,15 @@ AttrBuilder &AttrBuilder::addInAllocaAttr(Type *Ty) {
return addTypeAttr(Attribute::InAlloca, Ty);
}
+AttrBuilder &AttrBuilder::addConstantRangeAttr(Attribute::AttrKind Kind,
+ const ConstantRange &CR) {
+ return addAttribute(Attribute::get(Ctx, Kind, CR));
+}
+
+AttrBuilder &AttrBuilder::addRangeAttr(const ConstantRange &CR) {
+ return addConstantRangeAttr(Attribute::Range, CR);
+}
+
AttrBuilder &AttrBuilder::merge(const AttrBuilder &B) {
// TODO: Could make this O(n) as we're merging two sorted lists.
for (const auto &I : B.attrs())
@@ -1952,6 +2022,12 @@ AttributeMask AttributeFuncs::typeIncompatible(Type *Ty,
Incompatible.addAttribute(Attribute::SExt).addAttribute(Attribute::ZExt);
}
+ if (!Ty->isIntOrIntVectorTy()) {
+ // Attributes that only apply to integers or vector of integers.
+ if (ASK & ASK_SAFE_TO_DROP)
+ Incompatible.addAttribute(Attribute::Range);
+ }
+
if (!Ty->isPointerTy()) {
// Attributes that only apply to pointers.
if (ASK & ASK_SAFE_TO_DROP)
diff --git a/llvm/lib/IR/Verifier.cpp b/llvm/lib/IR/Verifier.cpp
index 3741e5deaa4cd1..108b53716ce052 100644
--- a/llvm/lib/IR/Verifier.cpp
+++ b/llvm/lib/IR/Verifier.cpp
@@ -2027,6 +2027,11 @@ void Verifier::verifyParameterAttrs(AttributeSet Attrs, Type *Ty,
Check((Val & ~static_cast<unsigned>(fcAllFlags)) == 0,
"Invalid value for 'nofpclass' test mask", V);
}
+ if (Attrs.hasAttribute(Attribute::Range)) {
+ auto CR = Attrs.getAttribute(Attribute::Range).getValueAsConstantRange();
+ Check(Ty->isIntOrIntVectorTy(CR.getBitWidth()),
+ "Range bit width must match type bit width!", V);
+ }
}
void Verifier::checkUnsignedBaseTenFuncAttr(AttributeList Attrs, StringRef Attr,
diff --git a/llvm/lib/Transforms/Utils/CodeExtractor.cpp b/llvm/lib/Transforms/Utils/CodeExtractor.cpp
index bab065153f3efa..80c154d7337d4e 100644
--- a/llvm/lib/Transforms/Utils/CodeExtractor.cpp
+++ b/llvm/lib/Transforms/Utils/CodeExtractor.cpp
@@ -999,6 +999,7 @@ Function *CodeExtractor::constructFunction(const ValueSet &inputs,
case Attribute::WriteOnly:
case Attribute::Writable:
case Attribute::DeadOnUnwind:
+ case Attribute::Range:
// These are not really attributes.
case Attribute::None:
case Attribute::EndAttrKinds:
diff --git a/llvm/test/Assembler/range-attribute-invalid.ll b/llvm/test/Assembler/range-attribute-invalid.ll
new file mode 100644
index 00000000000000..83cc166c4f5a64
--- /dev/null
+++ b/llvm/test/Assembler/range-attribute-invalid.ll
@@ -0,0 +1,8 @@
+; RUN: not llvm-as < %s -o /dev/null 2>&1 | FileCheck %s
+
+; Check the error message on full range attribute.
+
+; CHECK: The range should not represent the full or empty set!
+define void @range_empty(i8 range(i8,0,0) %a) {
+ ret void
+}
diff --git a/llvm/test/Bitcode/attributes.ll b/llvm/test/Bitcode/attributes.ll
index 6921f11a352ddf..437dfbc958d34d 100644
--- a/llvm/test/Bitcode/attributes.ll
+++ b/llvm/test/Bitcode/attributes.ll
@@ -526,6 +526,16 @@ define void @f91(ptr dead_on_unwind %p) {
ret void
}
+; CHECK: define range(i32,-1,42) i32 @range_attribute(<4 x i32> range(i32,-1,42) %a)
+define range(i32,-1,42) i32 @range_attribute(<4 x i32> range(i32,-1,42) %a) {
+ ret i32 0
+}
+
+; CHECK: define void @wide_range_attribute(i128 range(i128,618970019642690137449562111,618970019642690137449562114) %a)
+define void @wide_range_attribute(i128 range(i128,618970019642690137449562111,618970019642690137449562114) %a) {
+ ret void
+}
+
; CHECK: attributes #0 = { noreturn }
; CHECK: attributes #1 = { nounwind }
; CHECK: attributes #2 = { memory(none) }
diff --git a/llvm/test/Verifier/range-attr.ll b/llvm/test/Verifier/range-attr.ll
new file mode 100644
index 00000000000000..ea67073fb3aaa8
--- /dev/null
+++ b/llvm/test/Verifier/range-attr.ll
@@ -0,0 +1,11 @@
+; RUN: not llvm-as %s -o /dev/null 2>&1 | FileCheck %s
+
+; CHECK: Range bit width must match type bit width!
+define void @bit_widths_do_not_match(i32 range(i8,1,0) %a) {
+ ret void
+}
+
+; CHECK: Range bit width must match type bit width!
+define void @bit_widths_do_not_match_vector(<4 x i32> range(i8,1,0) %a) {
+ ret void
+}
diff --git a/llvm/utils/TableGen/Attributes.cpp b/llvm/utils/TableGen/Attributes.cpp
index db3c4decccb4cf..d9fc7834416cfb 100644
--- a/llvm/utils/TableGen/Attributes.cpp
+++ b/llvm/utils/TableGen/Attributes.cpp
@@ -53,7 +53,8 @@ void Attributes::emitTargetIndependentNames(raw_ostream &OS) {
};
// Emit attribute enums in the same order llvm::Attribute::operator< expects.
- Emit({"EnumAttr", "TypeAttr", "IntAttr"}, "ATTRIBUTE_ENUM");
+ Emit({"EnumAttr", "TypeAttr", "IntAttr", "ConstantRangeAttr"},
+ "ATTRIBUTE_ENUM");
Emit({"StrBoolAttr"}, "ATTRIBUTE_STRBOOL");
Emit({"ComplexStrAttr"}, "ATTRIBUTE_COMPLEXSTR");
@@ -63,7 +64,8 @@ void Attributes::emitTargetIndependentNames(raw_ostream &OS) {
OS << "#ifdef GET_ATTR_ENUM\n";
OS << "#undef GET_ATTR_ENUM\n";
unsigned Value = 1; // Leave zero for AttrKind::None.
- for (StringRef KindName : {"EnumAttr", "TypeAttr", "IntAttr"}) {
+ for (StringRef KindName :
+ {"EnumAttr", "TypeAttr", "IntAttr", "ConstantRangeAttr"}) {
OS << "First" << KindName << " = " << Value << ",\n";
for (auto *A : Records.getAllDerivedDefinitions(KindName)) {
OS << A->getName() << " = " << Value << ",\n";
@@ -117,7 +119,8 @@ void Attributes::emitAttributeProperties(raw_ostream &OS) {
OS << "#ifdef GET_ATTR_PROP_TABLE\n";
OS << "#undef GET_ATTR_PROP_TABLE\n";
OS << "static const uint8_t AttrPropTable[] = {\n";
- for (StringRef KindName : {"EnumAttr", "TypeAttr", "IntAttr"}) {
+ for (StringRef KindName :
+ {"EnumAttr", "TypeAttr", "IntAttr", "ConstantRangeAttr"}) {
for (auto *A : Records.getAllDerivedDefinitions(KindName)) {
OS << "0";
for (Init *P : *A->getValueAsListInit("Properties"))
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