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[SimplifyCFG] Supporting hoisting/sinking callbases with differing attrs
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Some (many) attributes can safely be dropped to enable sinking. For
example removing `nonnull` on a return/param can't affect correctness.

Closes llvm#109472
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@goldsteinn
goldsteinn committed Oct 1, 2024
1 parent c426594 commit 4d4beeb
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Showing 6 changed files with 121 additions and 118 deletions.
16 changes: 16 additions & 0 deletions llvm/include/llvm/IR/InstrTypes.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1461,6 +1461,22 @@ class CallBase : public Instruction {
///
void setAttributes(AttributeList A) { Attrs = A; }

/// Try to intersect the attributes from 'this' CallBase and the
/// 'Other' CallBase. Sets the intersected attributes to 'this' and
/// return true if successful. Doesn't modify 'this' and returns
/// false if unsuccessful.
bool tryIntersectAttributes(const CallBase *Other) {
if (this == Other)
return true;
AttributeList AL = getAttributes();
AttributeList ALOther = Other->getAttributes();
auto Intersected = AL.intersectWith(getContext(), ALOther);
if (!Intersected)
return false;
setAttributes(*Intersected);
return true;
}

/// Determine whether this call has the given attribute. If it does not
/// then determine if the called function has the attribute, but only if
/// the attribute is allowed for the call.
Expand Down
14 changes: 9 additions & 5 deletions llvm/include/llvm/IR/Instruction.h
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Original file line number Diff line number Diff line change
Expand Up @@ -881,16 +881,20 @@ class Instruction : public User,
/// This is like isIdenticalTo, except that it ignores the
/// SubclassOptionalData flags, which may specify conditions under which the
/// instruction's result is undefined.
bool isIdenticalToWhenDefined(const Instruction *I) const LLVM_READONLY;
bool
isIdenticalToWhenDefined(const Instruction *I,
bool IntersectAttrs = false) const LLVM_READONLY;

/// When checking for operation equivalence (using isSameOperationAs) it is
/// sometimes useful to ignore certain attributes.
enum OperationEquivalenceFlags {
/// Check for equivalence ignoring load/store alignment.
CompareIgnoringAlignment = 1<<0,
CompareIgnoringAlignment = 1 << 0,
/// Check for equivalence treating a type and a vector of that type
/// as equivalent.
CompareUsingScalarTypes = 1<<1
CompareUsingScalarTypes = 1 << 1,
/// Check for equivalence with intersected callbase attrs.
CompareUsingIntersectedAttrs = 1 << 2,
};

/// This function determines if the specified instruction executes the same
Expand All @@ -911,8 +915,8 @@ class Instruction : public User,
/// @returns true if the specific instruction has the same opcde specific
/// characteristics as the current one. Determine if one instruction has the
/// same state as another.
bool hasSameSpecialState(const Instruction *I2,
bool IgnoreAlignment = false) const LLVM_READONLY;
bool hasSameSpecialState(const Instruction *I2, bool IgnoreAlignment = false,
bool IntersectAttrs = false) const LLVM_READONLY;

/// Return true if there are any uses of this instruction in blocks other than
/// the specified block. Note that PHI nodes are considered to evaluate their
Expand Down
32 changes: 22 additions & 10 deletions llvm/lib/IR/Instruction.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -785,11 +785,21 @@ const char *Instruction::getOpcodeName(unsigned OpCode) {
/// This must be kept in sync with FunctionComparator::cmpOperations in
/// lib/Transforms/IPO/MergeFunctions.cpp.
bool Instruction::hasSameSpecialState(const Instruction *I2,
bool IgnoreAlignment) const {
bool IgnoreAlignment,
bool IntersectAttrs) const {
auto I1 = this;
assert(I1->getOpcode() == I2->getOpcode() &&
"Can not compare special state of different instructions");

auto CheckAttrsSame = [IntersectAttrs](const CallBase *CB0,
const CallBase *CB1) {
return IntersectAttrs
? CB0->getAttributes()
.intersectWith(CB0->getContext(), CB1->getAttributes())
.has_value()
: CB0->getAttributes() == CB1->getAttributes();
};

if (const AllocaInst *AI = dyn_cast<AllocaInst>(I1))
return AI->getAllocatedType() == cast<AllocaInst>(I2)->getAllocatedType() &&
(AI->getAlign() == cast<AllocaInst>(I2)->getAlign() ||
Expand All @@ -811,15 +821,15 @@ bool Instruction::hasSameSpecialState(const Instruction *I2,
if (const CallInst *CI = dyn_cast<CallInst>(I1))
return CI->isTailCall() == cast<CallInst>(I2)->isTailCall() &&
CI->getCallingConv() == cast<CallInst>(I2)->getCallingConv() &&
CI->getAttributes() == cast<CallInst>(I2)->getAttributes() &&
CheckAttrsSame(CI, cast<CallInst>(I2)) &&
CI->hasIdenticalOperandBundleSchema(*cast<CallInst>(I2));
if (const InvokeInst *CI = dyn_cast<InvokeInst>(I1))
return CI->getCallingConv() == cast<InvokeInst>(I2)->getCallingConv() &&
CI->getAttributes() == cast<InvokeInst>(I2)->getAttributes() &&
CheckAttrsSame(CI, cast<InvokeInst>(I2)) &&
CI->hasIdenticalOperandBundleSchema(*cast<InvokeInst>(I2));
if (const CallBrInst *CI = dyn_cast<CallBrInst>(I1))
return CI->getCallingConv() == cast<CallBrInst>(I2)->getCallingConv() &&
CI->getAttributes() == cast<CallBrInst>(I2)->getAttributes() &&
CheckAttrsSame(CI, cast<CallBrInst>(I2)) &&
CI->hasIdenticalOperandBundleSchema(*cast<CallBrInst>(I2));
if (const InsertValueInst *IVI = dyn_cast<InsertValueInst>(I1))
return IVI->getIndices() == cast<InsertValueInst>(I2)->getIndices();
Expand Down Expand Up @@ -857,10 +867,10 @@ bool Instruction::isIdenticalTo(const Instruction *I) const {
SubclassOptionalData == I->SubclassOptionalData;
}

bool Instruction::isIdenticalToWhenDefined(const Instruction *I) const {
bool Instruction::isIdenticalToWhenDefined(const Instruction *I,
bool IntersectAttrs) const {
if (getOpcode() != I->getOpcode() ||
getNumOperands() != I->getNumOperands() ||
getType() != I->getType())
getNumOperands() != I->getNumOperands() || getType() != I->getType())
return false;

// If both instructions have no operands, they are identical.
Expand All @@ -879,15 +889,17 @@ bool Instruction::isIdenticalToWhenDefined(const Instruction *I) const {
otherPHI->block_begin());
}

return this->hasSameSpecialState(I);
return this->hasSameSpecialState(I, /*IgnoreAlignment=*/false,
IntersectAttrs);
}

// Keep this in sync with FunctionComparator::cmpOperations in
// lib/Transforms/IPO/MergeFunctions.cpp.
bool Instruction::isSameOperationAs(const Instruction *I,
unsigned flags) const {
bool IgnoreAlignment = flags & CompareIgnoringAlignment;
bool UseScalarTypes = flags & CompareUsingScalarTypes;
bool UseScalarTypes = flags & CompareUsingScalarTypes;
bool IntersectAttrs = flags & CompareUsingIntersectedAttrs;

if (getOpcode() != I->getOpcode() ||
getNumOperands() != I->getNumOperands() ||
Expand All @@ -905,7 +917,7 @@ bool Instruction::isSameOperationAs(const Instruction *I,
getOperand(i)->getType() != I->getOperand(i)->getType())
return false;

return this->hasSameSpecialState(I, IgnoreAlignment);
return this->hasSameSpecialState(I, IgnoreAlignment, IntersectAttrs);
}

bool Instruction::isUsedOutsideOfBlock(const BasicBlock *BB) const {
Expand Down
19 changes: 17 additions & 2 deletions llvm/lib/Transforms/Utils/SimplifyCFG.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1594,7 +1594,7 @@ static void hoistLockstepIdenticalDbgVariableRecords(

static bool areIdenticalUpToCommutativity(const Instruction *I1,
const Instruction *I2) {
if (I1->isIdenticalToWhenDefined(I2))
if (I1->isIdenticalToWhenDefined(I2, /*IntersectAttrs=*/true))
return true;

if (auto *Cmp1 = dyn_cast<CmpInst>(I1))
Expand Down Expand Up @@ -1910,6 +1910,14 @@ bool SimplifyCFGOpt::hoistCommonCodeFromSuccessors(Instruction *TI,
if (!I2->use_empty())
I2->replaceAllUsesWith(I1);
I1->andIRFlags(I2);
if (auto *CB = dyn_cast<CallBase>(I1)) {
bool Success = CB->tryIntersectAttributes(cast<CallBase>(I2));
assert(Success && "We should not be trying to hoist callbases "
"with non-intersectable attributes");
// For NDEBUG Compile.
(void)Success;
}

combineMetadataForCSE(I1, I2, true);
// I1 and I2 are being combined into a single instruction. Its debug
// location is the merged locations of the original instructions.
Expand Down Expand Up @@ -2130,7 +2138,7 @@ static bool canSinkInstructions(
const Instruction *I0 = Insts.front();
const auto I0MMRA = MMRAMetadata(*I0);
for (auto *I : Insts) {
if (!I->isSameOperationAs(I0))
if (!I->isSameOperationAs(I0, Instruction::CompareUsingIntersectedAttrs))
return false;

// swifterror pointers can only be used by a load or store; sinking a load
Expand Down Expand Up @@ -2287,6 +2295,13 @@ static void sinkLastInstruction(ArrayRef<BasicBlock*> Blocks) {
I0->applyMergedLocation(I0->getDebugLoc(), I->getDebugLoc());
combineMetadataForCSE(I0, I, true);
I0->andIRFlags(I);
if (auto *CB = dyn_cast<CallBase>(I0)) {
bool Success = CB->tryIntersectAttributes(cast<CallBase>(I));
assert(Success && "We should not be trying to sink callbases "
"with non-intersectable attributes");
// For NDEBUG Compile.
(void)Success;
}
}

for (User *U : make_early_inc_range(I0->users())) {
Expand Down
78 changes: 28 additions & 50 deletions llvm/test/Transforms/SimplifyCFG/hoist-cb-diff-attrs.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -8,15 +8,11 @@ declare void @side.effect()
define ptr @test_hoist_int_attrs(i1 %c, ptr %p, ptr %p2, i64 %x) {
; CHECK-LABEL: define {{[^@]+}}@test_hoist_int_attrs
; CHECK-SAME: (i1 [[C:%.*]], ptr [[P:%.*]], ptr [[P2:%.*]], i64 [[X:%.*]]) {
; CHECK-NEXT: br i1 [[C]], label [[IF:%.*]], label [[ELSE:%.*]]
; CHECK-NEXT: [[R:%.*]] = call ptr @foo2(ptr align 32 dereferenceable_or_null(100) [[P]], ptr align 32 dereferenceable(50) [[P2]], i64 range(i64 10, 100000) [[X]]) #[[ATTR0:[0-9]+]]
; CHECK-NEXT: br i1 [[C]], label [[COMMON_RET:%.*]], label [[ELSE:%.*]]
; CHECK: common.ret:
; CHECK-NEXT: [[COMMON_RET_OP:%.*]] = phi ptr [ [[R:%.*]], [[IF]] ], [ [[R2:%.*]], [[ELSE]] ]
; CHECK-NEXT: ret ptr [[COMMON_RET_OP]]
; CHECK: if:
; CHECK-NEXT: [[R]] = call ptr @foo2(ptr align 64 dereferenceable_or_null(100) [[P]], ptr align 64 dereferenceable(50) [[P2]], i64 range(i64 10, 1000) [[X]]) #[[ATTR0:[0-9]+]]
; CHECK-NEXT: br label [[COMMON_RET:%.*]]
; CHECK-NEXT: ret ptr [[R]]
; CHECK: else:
; CHECK-NEXT: [[R2]] = call ptr @foo2(ptr align 32 dereferenceable_or_null(200) [[P]], ptr align 32 dereferenceable(100) [[P2]], i64 range(i64 10000, 100000) [[X]]) #[[ATTR1:[0-9]+]]
; CHECK-NEXT: call void @side.effect()
; CHECK-NEXT: br label [[COMMON_RET]]
;
Expand All @@ -34,15 +30,11 @@ else:
define ptr @test_hoist_int_attrs2(i1 %c, ptr %p, i64 %x) {
; CHECK-LABEL: define {{[^@]+}}@test_hoist_int_attrs2
; CHECK-SAME: (i1 [[C:%.*]], ptr [[P:%.*]], i64 [[X:%.*]]) {
; CHECK-NEXT: br i1 [[C]], label [[IF:%.*]], label [[ELSE:%.*]]
; CHECK-NEXT: [[R:%.*]] = call ptr @foo(ptr dereferenceable(50) [[P]], i64 range(i64 10, 1000) [[X]]) #[[ATTR1:[0-9]+]]
; CHECK-NEXT: br i1 [[C]], label [[COMMON_RET:%.*]], label [[ELSE:%.*]]
; CHECK: common.ret:
; CHECK-NEXT: [[COMMON_RET_OP:%.*]] = phi ptr [ [[R:%.*]], [[IF]] ], [ [[R2:%.*]], [[ELSE]] ]
; CHECK-NEXT: ret ptr [[COMMON_RET_OP]]
; CHECK: if:
; CHECK-NEXT: [[R]] = call ptr @foo(ptr dereferenceable(50) [[P]], i64 range(i64 10, 1000) [[X]]) #[[ATTR0]]
; CHECK-NEXT: br label [[COMMON_RET:%.*]]
; CHECK-NEXT: ret ptr [[R]]
; CHECK: else:
; CHECK-NEXT: [[R2]] = call ptr @foo(ptr align 32 dereferenceable(100) dereferenceable_or_null(200) [[P]], i64 range(i64 11, 100) [[X]]) #[[ATTR2:[0-9]+]]
; CHECK-NEXT: call void @side.effect()
; CHECK-NEXT: br label [[COMMON_RET]]
;
Expand All @@ -60,15 +52,11 @@ else:
define ptr @test_hoist_bool_attrs2(i1 %c, ptr %p, i64 %x) {
; CHECK-LABEL: define {{[^@]+}}@test_hoist_bool_attrs2
; CHECK-SAME: (i1 [[C:%.*]], ptr [[P:%.*]], i64 [[X:%.*]]) {
; CHECK-NEXT: br i1 [[C]], label [[IF:%.*]], label [[ELSE:%.*]]
; CHECK-NEXT: [[R:%.*]] = call noundef ptr @foo(ptr nonnull [[P]], i64 noundef [[X]]) #[[ATTR2:[0-9]+]]
; CHECK-NEXT: br i1 [[C]], label [[COMMON_RET:%.*]], label [[ELSE:%.*]]
; CHECK: common.ret:
; CHECK-NEXT: [[COMMON_RET_OP:%.*]] = phi ptr [ [[R:%.*]], [[IF]] ], [ [[R2:%.*]], [[ELSE]] ]
; CHECK-NEXT: ret ptr [[COMMON_RET_OP]]
; CHECK: if:
; CHECK-NEXT: [[R]] = call noundef ptr @foo(ptr noundef nonnull readnone [[P]], i64 noundef [[X]]) #[[ATTR3:[0-9]+]]
; CHECK-NEXT: br label [[COMMON_RET:%.*]]
; CHECK-NEXT: ret ptr [[R]]
; CHECK: else:
; CHECK-NEXT: [[R2]] = call noundef nonnull ptr @foo(ptr nonnull readonly [[P]], i64 noundef [[X]]) #[[ATTR4:[0-9]+]]
; CHECK-NEXT: call void @side.effect()
; CHECK-NEXT: br label [[COMMON_RET]]
;
Expand All @@ -86,15 +74,11 @@ else:
define ptr @test_hoist_bool_attrs3(i1 %c, ptr %p, i64 %x) {
; CHECK-LABEL: define {{[^@]+}}@test_hoist_bool_attrs3
; CHECK-SAME: (i1 [[C:%.*]], ptr [[P:%.*]], i64 [[X:%.*]]) {
; CHECK-NEXT: br i1 [[C]], label [[IF:%.*]], label [[ELSE:%.*]]
; CHECK-NEXT: [[R:%.*]] = call nonnull ptr @foo(ptr [[P]], i64 noundef [[X]]) #[[ATTR3:[0-9]+]]
; CHECK-NEXT: br i1 [[C]], label [[COMMON_RET:%.*]], label [[ELSE:%.*]]
; CHECK: common.ret:
; CHECK-NEXT: [[COMMON_RET_OP:%.*]] = phi ptr [ [[R:%.*]], [[IF]] ], [ [[R2:%.*]], [[ELSE]] ]
; CHECK-NEXT: ret ptr [[COMMON_RET_OP]]
; CHECK: if:
; CHECK-NEXT: [[R]] = call nonnull ptr @foo(ptr noundef readonly [[P]], i64 noundef [[X]]) #[[ATTR5:[0-9]+]]
; CHECK-NEXT: br label [[COMMON_RET:%.*]]
; CHECK-NEXT: ret ptr [[R]]
; CHECK: else:
; CHECK-NEXT: [[R2]] = call noundef nonnull ptr @foo(ptr nonnull writeonly [[P]], i64 noundef [[X]]) #[[ATTR6:[0-9]+]]
; CHECK-NEXT: call void @side.effect()
; CHECK-NEXT: br label [[COMMON_RET]]
;
Expand All @@ -117,10 +101,10 @@ define ptr @test_hoist_bool_attrs_fail_non_droppable(i1 %c, ptr %p, i64 %x) {
; CHECK-NEXT: [[COMMON_RET_OP:%.*]] = phi ptr [ [[R:%.*]], [[IF]] ], [ [[R2:%.*]], [[ELSE]] ]
; CHECK-NEXT: ret ptr [[COMMON_RET_OP]]
; CHECK: if:
; CHECK-NEXT: [[R]] = call nonnull ptr @foo(ptr noundef readonly [[P]], i64 noundef [[X]]) #[[ATTR5]]
; CHECK-NEXT: [[R]] = call nonnull ptr @foo(ptr noundef readonly [[P]], i64 noundef [[X]]) #[[ATTR4:[0-9]+]]
; CHECK-NEXT: br label [[COMMON_RET:%.*]]
; CHECK: else:
; CHECK-NEXT: [[R2]] = call noundef nonnull ptr @foo(ptr nonnull writeonly [[P]], i64 noundef [[X]]) #[[ATTR7:[0-9]+]]
; CHECK-NEXT: [[R2]] = call noundef nonnull ptr @foo(ptr nonnull writeonly [[P]], i64 noundef [[X]]) #[[ATTR5:[0-9]+]]
; CHECK-NEXT: call void @side.effect()
; CHECK-NEXT: br label [[COMMON_RET]]
;
Expand All @@ -143,10 +127,10 @@ define ptr @test_hoist_bool_attrs_fail_non_droppable2(i1 %c, ptr %p, i64 %x) {
; CHECK-NEXT: [[COMMON_RET_OP:%.*]] = phi ptr [ [[R:%.*]], [[IF]] ], [ [[R2:%.*]], [[ELSE]] ]
; CHECK-NEXT: ret ptr [[COMMON_RET_OP]]
; CHECK: if:
; CHECK-NEXT: [[R]] = call nonnull ptr @foo(ptr noundef readonly [[P]], i64 noundef [[X]]) #[[ATTR8:[0-9]+]]
; CHECK-NEXT: [[R]] = call nonnull ptr @foo(ptr noundef readonly [[P]], i64 noundef [[X]]) #[[ATTR6:[0-9]+]]
; CHECK-NEXT: br label [[COMMON_RET:%.*]]
; CHECK: else:
; CHECK-NEXT: [[R2]] = call noundef nonnull ptr @foo(ptr nonnull writeonly byval(i64) [[P]], i64 noundef [[X]]) #[[ATTR7]]
; CHECK-NEXT: [[R2]] = call noundef nonnull ptr @foo(ptr nonnull writeonly byval(i64) [[P]], i64 noundef [[X]]) #[[ATTR5]]
; CHECK-NEXT: call void @side.effect()
; CHECK-NEXT: br label [[COMMON_RET]]
;
Expand All @@ -169,10 +153,10 @@ define ptr @test_hoist_bool_attrs_fail_non_droppable3(i1 %c, ptr %p, i64 %x) {
; CHECK-NEXT: [[COMMON_RET_OP:%.*]] = phi ptr [ [[R:%.*]], [[IF]] ], [ [[R2:%.*]], [[ELSE]] ]
; CHECK-NEXT: ret ptr [[COMMON_RET_OP]]
; CHECK: if:
; CHECK-NEXT: [[R]] = call nonnull ptr @foo(ptr noundef readonly byval(i32) [[P]], i64 noundef [[X]]) #[[ATTR8]]
; CHECK-NEXT: [[R]] = call nonnull ptr @foo(ptr noundef readonly byval(i32) [[P]], i64 noundef [[X]]) #[[ATTR6]]
; CHECK-NEXT: br label [[COMMON_RET:%.*]]
; CHECK: else:
; CHECK-NEXT: [[R2]] = call noundef nonnull ptr @foo(ptr nonnull writeonly byval(i64) [[P]], i64 noundef [[X]]) #[[ATTR7]]
; CHECK-NEXT: [[R2]] = call noundef nonnull ptr @foo(ptr nonnull writeonly byval(i64) [[P]], i64 noundef [[X]]) #[[ATTR5]]
; CHECK-NEXT: call void @side.effect()
; CHECK-NEXT: br label [[COMMON_RET]]
;
Expand All @@ -190,15 +174,11 @@ else:
define ptr @test_hoist_bool_attrs4(i1 %c, ptr %p, i64 %x) {
; CHECK-LABEL: define {{[^@]+}}@test_hoist_bool_attrs4
; CHECK-SAME: (i1 [[C:%.*]], ptr [[P:%.*]], i64 [[X:%.*]]) {
; CHECK-NEXT: br i1 [[C]], label [[IF:%.*]], label [[ELSE:%.*]]
; CHECK-NEXT: [[R:%.*]] = call nonnull ptr @foo(ptr byval(i64) [[P]], i64 noundef [[X]]) #[[ATTR5]]
; CHECK-NEXT: br i1 [[C]], label [[COMMON_RET:%.*]], label [[ELSE:%.*]]
; CHECK: common.ret:
; CHECK-NEXT: [[COMMON_RET_OP:%.*]] = phi ptr [ [[R:%.*]], [[IF]] ], [ [[R2:%.*]], [[ELSE]] ]
; CHECK-NEXT: ret ptr [[COMMON_RET_OP]]
; CHECK: if:
; CHECK-NEXT: [[R]] = call nonnull ptr @foo(ptr noundef readonly byval(i64) [[P]], i64 noundef [[X]]) #[[ATTR8]]
; CHECK-NEXT: br label [[COMMON_RET:%.*]]
; CHECK-NEXT: ret ptr [[R]]
; CHECK: else:
; CHECK-NEXT: [[R2]] = call noundef nonnull ptr @foo(ptr nonnull writeonly byval(i64) [[P]], i64 noundef [[X]]) #[[ATTR7]]
; CHECK-NEXT: call void @side.effect()
; CHECK-NEXT: br label [[COMMON_RET]]
;
Expand All @@ -214,13 +194,11 @@ else:
}

;.
; CHECK: attributes #[[ATTR0]] = { memory(read) }
; CHECK: attributes #[[ATTR1]] = { memory(write) }
; CHECK: attributes #[[ATTR2]] = { memory(none) }
; CHECK: attributes #[[ATTR3]] = { cold mustprogress nocallback nofree nosync willreturn }
; CHECK: attributes #[[ATTR4]] = { mustprogress nocallback nofree willreturn }
; CHECK: attributes #[[ATTR5]] = { alwaysinline cold nocallback nofree nosync willreturn }
; CHECK: attributes #[[ATTR6]] = { alwaysinline nosync willreturn }
; CHECK: attributes #[[ATTR7]] = { nosync willreturn }
; CHECK: attributes #[[ATTR8]] = { cold nocallback nofree nosync willreturn }
; CHECK: attributes #[[ATTR0]] = { memory(readwrite) }
; CHECK: attributes #[[ATTR1]] = { memory(read) }
; CHECK: attributes #[[ATTR2]] = { mustprogress nocallback nofree willreturn }
; CHECK: attributes #[[ATTR3]] = { alwaysinline nosync willreturn }
; CHECK: attributes #[[ATTR4]] = { alwaysinline cold nocallback nofree nosync willreturn }
; CHECK: attributes #[[ATTR5]] = { nosync willreturn }
; CHECK: attributes #[[ATTR6]] = { cold nocallback nofree nosync willreturn }
;.
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