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Refactor operation equivalence checking in BBVectorize by extending Instruction::isSameOperationAs.

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Maintaining this kind of checking in different places is dangerous, extending
Instruction::isSameOperationAs consolidates this logic into one place. Here
I've added an optional flags parameter and two flags that are important for
vectorization: CompareIgnoringAlignment and CompareUsingScalarTypes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159329 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel 2012-06-28 05:42:26 +00:00
parent 97a759249d
commit ec4e85e336
3 changed files with 29 additions and 29 deletions
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12
include/llvm/Instruction.h
View File

@ -281,6 +281,16 @@ public:
/// ignores the SubclassOptionalData flags, which specify conditions
/// under which the instruction's result is undefined.
bool isIdenticalToWhenDefined(const Instruction *I) const;
/// 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,
/// Check for equivalence treating a type and a vector of that type
/// as equivalent.
CompareUsingScalarTypes = 1<<1
};
/// This function determines if the specified instruction executes the same
/// operation as the current one. This means that the opcodes, type, operand
@ -290,7 +300,7 @@ public:
/// @returns true if the specified instruction is the same operation as
/// the current one.
/// @brief Determine if one instruction is the same operation as another.
bool isSameOperationAs(const Instruction *I) const;
bool isSameOperationAs(const Instruction *I, unsigned flags = 0) const;
/// isUsedOutsideOfBlock - Return true if there are any uses of this
/// instruction in blocks other than the specified block. Note that PHI nodes

25
lib/Transforms/Vectorize/BBVectorize.cpp
View File

@ -660,30 +660,9 @@ namespace {
// Loads and stores can be merged if they have different alignments,
// but are otherwise the same.
LoadInst *LI, *LJ;
StoreInst *SI, *SJ;
if ((LI = dyn_cast<LoadInst>(I)) && (LJ = dyn_cast<LoadInst>(J))) {
if (I->getType() != J->getType())
return false;
if (LI->getPointerOperand()->getType() !=
LJ->getPointerOperand()->getType() ||
LI->isVolatile() != LJ->isVolatile() ||
LI->getOrdering() != LJ->getOrdering() ||
LI->getSynchScope() != LJ->getSynchScope())
return false;
} else if ((SI = dyn_cast<StoreInst>(I)) && (SJ = dyn_cast<StoreInst>(J))) {
if (SI->getValueOperand()->getType() !=
SJ->getValueOperand()->getType() ||
SI->getPointerOperand()->getType() !=
SJ->getPointerOperand()->getType() ||
SI->isVolatile() != SJ->isVolatile() ||
SI->getOrdering() != SJ->getOrdering() ||
SI->getSynchScope() != SJ->getSynchScope())
return false;
} else if (!J->isSameOperationAs(I)) {
if (!J->isSameOperationAs(I, Instruction::CompareIgnoringAlignment))
return false;
}
// FIXME: handle addsub-type operations!
if (IsSimpleLoadStore) {

21
lib/VMCore/Instruction.cpp
View File

@ -240,27 +240,38 @@ bool Instruction::isIdenticalToWhenDefined(const Instruction *I) const {
// isSameOperationAs
// This should be kept in sync with isEquivalentOperation in
// lib/Transforms/IPO/MergeFunctions.cpp.
bool Instruction::isSameOperationAs(const Instruction *I) const {
bool Instruction::isSameOperationAs(const Instruction *I,
unsigned flags) const {
bool IgnoreAlignment = flags & CompareIgnoringAlignment;
bool UseScalarTypes = flags & CompareUsingScalarTypes;
if (getOpcode() != I->getOpcode() ||
getNumOperands() != I->getNumOperands() ||
getType() != I->getType())
(UseScalarTypes ?
getType()->getScalarType() != I->getType()->getScalarType() :
getType() != I->getType()))
return false;
// We have two instructions of identical opcode and #operands. Check to see
// if all operands are the same type
for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
if (getOperand(i)->getType() != I->getOperand(i)->getType())
if (UseScalarTypes ?
getOperand(i)->getType()->getScalarType() !=
I->getOperand(i)->getType()->getScalarType() :
getOperand(i)->getType() != I->getOperand(i)->getType())
return false;
// Check special state that is a part of some instructions.
if (const LoadInst *LI = dyn_cast<LoadInst>(this))
return LI->isVolatile() == cast<LoadInst>(I)->isVolatile() &&
LI->getAlignment() == cast<LoadInst>(I)->getAlignment() &&
(LI->getAlignment() == cast<LoadInst>(I)->getAlignment() ||
IgnoreAlignment) &&
LI->getOrdering() == cast<LoadInst>(I)->getOrdering() &&
LI->getSynchScope() == cast<LoadInst>(I)->getSynchScope();
if (const StoreInst *SI = dyn_cast<StoreInst>(this))
return SI->isVolatile() == cast<StoreInst>(I)->isVolatile() &&
SI->getAlignment() == cast<StoreInst>(I)->getAlignment() &&
(SI->getAlignment() == cast<StoreInst>(I)->getAlignment() ||
IgnoreAlignment) &&
SI->getOrdering() == cast<StoreInst>(I)->getOrdering() &&
SI->getSynchScope() == cast<StoreInst>(I)->getSynchScope();
if (const CmpInst *CI = dyn_cast<CmpInst>(this))