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llvmutil.cpp
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/*
Copyright (c) 2010-2013, Intel Corporation
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of Intel Corporation nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @file llvmutil.cpp
@brief Implementations of various LLVM utility types and classes.
*/
#include "llvmutil.h"
#include "ispc.h"
#include "type.h"
#if defined(LLVM_3_1) || defined(LLVM_3_2)
#include <llvm/Instructions.h>
#include <llvm/BasicBlock.h>
#else
#include <llvm/IR/Instructions.h>
#include <llvm/IR/BasicBlock.h>
#endif
#include <set>
#include <map>
llvm::Type *LLVMTypes::VoidType = NULL;
llvm::PointerType *LLVMTypes::VoidPointerType = NULL;
llvm::Type *LLVMTypes::PointerIntType = NULL;
llvm::Type *LLVMTypes::BoolType = NULL;
llvm::Type *LLVMTypes::Int8Type = NULL;
llvm::Type *LLVMTypes::Int16Type = NULL;
llvm::Type *LLVMTypes::Int32Type = NULL;
llvm::Type *LLVMTypes::Int64Type = NULL;
llvm::Type *LLVMTypes::FloatType = NULL;
llvm::Type *LLVMTypes::DoubleType = NULL;
llvm::Type *LLVMTypes::Int8PointerType = NULL;
llvm::Type *LLVMTypes::Int16PointerType = NULL;
llvm::Type *LLVMTypes::Int32PointerType = NULL;
llvm::Type *LLVMTypes::Int64PointerType = NULL;
llvm::Type *LLVMTypes::FloatPointerType = NULL;
llvm::Type *LLVMTypes::DoublePointerType = NULL;
llvm::VectorType *LLVMTypes::MaskType = NULL;
llvm::VectorType *LLVMTypes::BoolVectorType = NULL;
llvm::VectorType *LLVMTypes::Int1VectorType = NULL;
llvm::VectorType *LLVMTypes::Int8VectorType = NULL;
llvm::VectorType *LLVMTypes::Int16VectorType = NULL;
llvm::VectorType *LLVMTypes::Int32VectorType = NULL;
llvm::VectorType *LLVMTypes::Int64VectorType = NULL;
llvm::VectorType *LLVMTypes::FloatVectorType = NULL;
llvm::VectorType *LLVMTypes::DoubleVectorType = NULL;
llvm::Type *LLVMTypes::Int8VectorPointerType = NULL;
llvm::Type *LLVMTypes::Int16VectorPointerType = NULL;
llvm::Type *LLVMTypes::Int32VectorPointerType = NULL;
llvm::Type *LLVMTypes::Int64VectorPointerType = NULL;
llvm::Type *LLVMTypes::FloatVectorPointerType = NULL;
llvm::Type *LLVMTypes::DoubleVectorPointerType = NULL;
llvm::VectorType *LLVMTypes::VoidPointerVectorType = NULL;
llvm::Constant *LLVMTrue = NULL;
llvm::Constant *LLVMFalse = NULL;
llvm::Constant *LLVMMaskAllOn = NULL;
llvm::Constant *LLVMMaskAllOff = NULL;
void
InitLLVMUtil(llvm::LLVMContext *ctx, Target& target) {
LLVMTypes::VoidType = llvm::Type::getVoidTy(*ctx);
LLVMTypes::VoidPointerType = llvm::PointerType::get(llvm::Type::getInt8Ty(*ctx), 0);
LLVMTypes::PointerIntType = target.is32Bit() ? llvm::Type::getInt32Ty(*ctx) :
llvm::Type::getInt64Ty(*ctx);
LLVMTypes::BoolType = llvm::Type::getInt1Ty(*ctx);
LLVMTypes::Int8Type = llvm::Type::getInt8Ty(*ctx);
LLVMTypes::Int16Type = llvm::Type::getInt16Ty(*ctx);
LLVMTypes::Int32Type = llvm::Type::getInt32Ty(*ctx);
LLVMTypes::Int64Type = llvm::Type::getInt64Ty(*ctx);
LLVMTypes::FloatType = llvm::Type::getFloatTy(*ctx);
LLVMTypes::DoubleType = llvm::Type::getDoubleTy(*ctx);
LLVMTypes::Int8PointerType = llvm::PointerType::get(LLVMTypes::Int8Type, 0);
LLVMTypes::Int16PointerType = llvm::PointerType::get(LLVMTypes::Int16Type, 0);
LLVMTypes::Int32PointerType = llvm::PointerType::get(LLVMTypes::Int32Type, 0);
LLVMTypes::Int64PointerType = llvm::PointerType::get(LLVMTypes::Int64Type, 0);
LLVMTypes::FloatPointerType = llvm::PointerType::get(LLVMTypes::FloatType, 0);
LLVMTypes::DoublePointerType = llvm::PointerType::get(LLVMTypes::DoubleType, 0);
switch (target.getMaskBitCount()) {
case 1:
LLVMTypes::MaskType = LLVMTypes::BoolVectorType =
llvm::VectorType::get(llvm::Type::getInt1Ty(*ctx), target.getVectorWidth());
break;
case 8:
LLVMTypes::MaskType = LLVMTypes::BoolVectorType =
llvm::VectorType::get(llvm::Type::getInt8Ty(*ctx), target.getVectorWidth());
break;
case 16:
LLVMTypes::MaskType = LLVMTypes::BoolVectorType =
llvm::VectorType::get(llvm::Type::getInt16Ty(*ctx), target.getVectorWidth());
break;
case 32:
LLVMTypes::MaskType = LLVMTypes::BoolVectorType =
llvm::VectorType::get(llvm::Type::getInt32Ty(*ctx), target.getVectorWidth());
break;
case 64:
LLVMTypes::MaskType = LLVMTypes::BoolVectorType =
llvm::VectorType::get(llvm::Type::getInt64Ty(*ctx), target.getVectorWidth());
break;
default:
FATAL("Unhandled mask width for initializing MaskType");
}
LLVMTypes::Int1VectorType =
llvm::VectorType::get(llvm::Type::getInt1Ty(*ctx), target.getVectorWidth());
LLVMTypes::Int8VectorType =
llvm::VectorType::get(LLVMTypes::Int8Type, target.getVectorWidth());
LLVMTypes::Int16VectorType =
llvm::VectorType::get(LLVMTypes::Int16Type, target.getVectorWidth());
LLVMTypes::Int32VectorType =
llvm::VectorType::get(LLVMTypes::Int32Type, target.getVectorWidth());
LLVMTypes::Int64VectorType =
llvm::VectorType::get(LLVMTypes::Int64Type, target.getVectorWidth());
LLVMTypes::FloatVectorType =
llvm::VectorType::get(LLVMTypes::FloatType, target.getVectorWidth());
LLVMTypes::DoubleVectorType =
llvm::VectorType::get(LLVMTypes::DoubleType, target.getVectorWidth());
LLVMTypes::Int8VectorPointerType = llvm::PointerType::get(LLVMTypes::Int8VectorType, 0);
LLVMTypes::Int16VectorPointerType = llvm::PointerType::get(LLVMTypes::Int16VectorType, 0);
LLVMTypes::Int32VectorPointerType = llvm::PointerType::get(LLVMTypes::Int32VectorType, 0);
LLVMTypes::Int64VectorPointerType = llvm::PointerType::get(LLVMTypes::Int64VectorType, 0);
LLVMTypes::FloatVectorPointerType = llvm::PointerType::get(LLVMTypes::FloatVectorType, 0);
LLVMTypes::DoubleVectorPointerType = llvm::PointerType::get(LLVMTypes::DoubleVectorType, 0);
LLVMTypes::VoidPointerVectorType = g->target->is32Bit() ? LLVMTypes::Int32VectorType :
LLVMTypes::Int64VectorType;
LLVMTrue = llvm::ConstantInt::getTrue(*ctx);
LLVMFalse = llvm::ConstantInt::getFalse(*ctx);
std::vector<llvm::Constant *> maskOnes;
llvm::Constant *onMask = NULL;
switch (target.getMaskBitCount()) {
case 1:
onMask = llvm::ConstantInt::get(llvm::Type::getInt1Ty(*ctx), 1,
false /*unsigned*/); // 0x1
break;
case 8:
onMask = llvm::ConstantInt::get(llvm::Type::getInt8Ty(*ctx), -1,
true /*signed*/); // 0xff
break;
case 16:
onMask = llvm::ConstantInt::get(llvm::Type::getInt16Ty(*ctx), -1,
true /*signed*/); // 0xffff
break;
case 32:
onMask = llvm::ConstantInt::get(llvm::Type::getInt32Ty(*ctx), -1,
true /*signed*/); // 0xffffffff
break;
case 64:
onMask = llvm::ConstantInt::get(llvm::Type::getInt64Ty(*ctx), -1,
true /*signed*/); // 0xffffffffffffffffull
break;
default:
FATAL("Unhandled mask width for onMask");
}
for (int i = 0; i < target.getVectorWidth(); ++i)
maskOnes.push_back(onMask);
LLVMMaskAllOn = llvm::ConstantVector::get(maskOnes);
std::vector<llvm::Constant *> maskZeros;
llvm::Constant *offMask = NULL;
switch (target.getMaskBitCount()) {
case 1:
offMask = llvm::ConstantInt::get(llvm::Type::getInt1Ty(*ctx), 0,
true /*signed*/);
break;
case 8:
offMask = llvm::ConstantInt::get(llvm::Type::getInt8Ty(*ctx), 0,
true /*signed*/);
break;
case 16:
offMask = llvm::ConstantInt::get(llvm::Type::getInt16Ty(*ctx), 0,
true /*signed*/);
break;
case 32:
offMask = llvm::ConstantInt::get(llvm::Type::getInt32Ty(*ctx), 0,
true /*signed*/);
break;
case 64:
offMask = llvm::ConstantInt::get(llvm::Type::getInt64Ty(*ctx), 0,
true /*signed*/);
break;
default:
FATAL("Unhandled mask width for offMask");
}
for (int i = 0; i < target.getVectorWidth(); ++i)
maskZeros.push_back(offMask);
LLVMMaskAllOff = llvm::ConstantVector::get(maskZeros);
}
llvm::ConstantInt *
LLVMInt8(int8_t ival) {
return llvm::ConstantInt::get(llvm::Type::getInt8Ty(*g->ctx), ival,
true /*signed*/);
}
llvm::ConstantInt *
LLVMUInt8(uint8_t ival) {
return llvm::ConstantInt::get(llvm::Type::getInt8Ty(*g->ctx), ival,
false /*unsigned*/);
}
llvm::ConstantInt *
LLVMInt16(int16_t ival) {
return llvm::ConstantInt::get(llvm::Type::getInt16Ty(*g->ctx), ival,
true /*signed*/);
}
llvm::ConstantInt *
LLVMUInt16(uint16_t ival) {
return llvm::ConstantInt::get(llvm::Type::getInt16Ty(*g->ctx), ival,
false /*unsigned*/);
}
llvm::ConstantInt *
LLVMInt32(int32_t ival) {
return llvm::ConstantInt::get(llvm::Type::getInt32Ty(*g->ctx), ival,
true /*signed*/);
}
llvm::ConstantInt *
LLVMUInt32(uint32_t ival) {
return llvm::ConstantInt::get(llvm::Type::getInt32Ty(*g->ctx), ival,
false /*unsigned*/);
}
llvm::ConstantInt *
LLVMInt64(int64_t ival) {
return llvm::ConstantInt::get(llvm::Type::getInt64Ty(*g->ctx), ival,
true /*signed*/);
}
llvm::ConstantInt *
LLVMUInt64(uint64_t ival) {
return llvm::ConstantInt::get(llvm::Type::getInt64Ty(*g->ctx), ival,
false /*unsigned*/);
}
llvm::Constant *
LLVMFloat(float fval) {
return llvm::ConstantFP::get(llvm::Type::getFloatTy(*g->ctx), fval);
}
llvm::Constant *
LLVMDouble(double dval) {
return llvm::ConstantFP::get(llvm::Type::getDoubleTy(*g->ctx), dval);
}
llvm::Constant *
LLVMInt8Vector(int8_t ival) {
llvm::Constant *v = LLVMInt8(ival);
std::vector<llvm::Constant *> vals;
for (int i = 0; i < g->target->getVectorWidth(); ++i)
vals.push_back(v);
return llvm::ConstantVector::get(vals);
}
llvm::Constant *
LLVMInt8Vector(const int8_t *ivec) {
std::vector<llvm::Constant *> vals;
for (int i = 0; i < g->target->getVectorWidth(); ++i)
vals.push_back(LLVMInt8(ivec[i]));
return llvm::ConstantVector::get(vals);
}
llvm::Constant *
LLVMUInt8Vector(uint8_t ival) {
llvm::Constant *v = LLVMUInt8(ival);
std::vector<llvm::Constant *> vals;
for (int i = 0; i < g->target->getVectorWidth(); ++i)
vals.push_back(v);
return llvm::ConstantVector::get(vals);
}
llvm::Constant *
LLVMUInt8Vector(const uint8_t *ivec) {
std::vector<llvm::Constant *> vals;
for (int i = 0; i < g->target->getVectorWidth(); ++i)
vals.push_back(LLVMUInt8(ivec[i]));
return llvm::ConstantVector::get(vals);
}
llvm::Constant *
LLVMInt16Vector(int16_t ival) {
llvm::Constant *v = LLVMInt16(ival);
std::vector<llvm::Constant *> vals;
for (int i = 0; i < g->target->getVectorWidth(); ++i)
vals.push_back(v);
return llvm::ConstantVector::get(vals);
}
llvm::Constant *
LLVMInt16Vector(const int16_t *ivec) {
std::vector<llvm::Constant *> vals;
for (int i = 0; i < g->target->getVectorWidth(); ++i)
vals.push_back(LLVMInt16(ivec[i]));
return llvm::ConstantVector::get(vals);
}
llvm::Constant *
LLVMUInt16Vector(uint16_t ival) {
llvm::Constant *v = LLVMUInt16(ival);
std::vector<llvm::Constant *> vals;
for (int i = 0; i < g->target->getVectorWidth(); ++i)
vals.push_back(v);
return llvm::ConstantVector::get(vals);
}
llvm::Constant *
LLVMUInt16Vector(const uint16_t *ivec) {
std::vector<llvm::Constant *> vals;
for (int i = 0; i < g->target->getVectorWidth(); ++i)
vals.push_back(LLVMUInt16(ivec[i]));
return llvm::ConstantVector::get(vals);
}
llvm::Constant *
LLVMInt32Vector(int32_t ival) {
llvm::Constant *v = LLVMInt32(ival);
std::vector<llvm::Constant *> vals;
for (int i = 0; i < g->target->getVectorWidth(); ++i)
vals.push_back(v);
return llvm::ConstantVector::get(vals);
}
llvm::Constant *
LLVMInt32Vector(const int32_t *ivec) {
std::vector<llvm::Constant *> vals;
for (int i = 0; i < g->target->getVectorWidth(); ++i)
vals.push_back(LLVMInt32(ivec[i]));
return llvm::ConstantVector::get(vals);
}
llvm::Constant *
LLVMUInt32Vector(uint32_t ival) {
llvm::Constant *v = LLVMUInt32(ival);
std::vector<llvm::Constant *> vals;
for (int i = 0; i < g->target->getVectorWidth(); ++i)
vals.push_back(v);
return llvm::ConstantVector::get(vals);
}
llvm::Constant *
LLVMUInt32Vector(const uint32_t *ivec) {
std::vector<llvm::Constant *> vals;
for (int i = 0; i < g->target->getVectorWidth(); ++i)
vals.push_back(LLVMUInt32(ivec[i]));
return llvm::ConstantVector::get(vals);
}
llvm::Constant *
LLVMFloatVector(float fval) {
llvm::Constant *v = LLVMFloat(fval);
std::vector<llvm::Constant *> vals;
for (int i = 0; i < g->target->getVectorWidth(); ++i)
vals.push_back(v);
return llvm::ConstantVector::get(vals);
}
llvm::Constant *
LLVMFloatVector(const float *fvec) {
std::vector<llvm::Constant *> vals;
for (int i = 0; i < g->target->getVectorWidth(); ++i)
vals.push_back(LLVMFloat(fvec[i]));
return llvm::ConstantVector::get(vals);
}
llvm::Constant *
LLVMDoubleVector(double dval) {
llvm::Constant *v = LLVMDouble(dval);
std::vector<llvm::Constant *> vals;
for (int i = 0; i < g->target->getVectorWidth(); ++i)
vals.push_back(v);
return llvm::ConstantVector::get(vals);
}
llvm::Constant *
LLVMDoubleVector(const double *dvec) {
std::vector<llvm::Constant *> vals;
for (int i = 0; i < g->target->getVectorWidth(); ++i)
vals.push_back(LLVMDouble(dvec[i]));
return llvm::ConstantVector::get(vals);
}
llvm::Constant *
LLVMInt64Vector(int64_t ival) {
llvm::Constant *v = LLVMInt64(ival);
std::vector<llvm::Constant *> vals;
for (int i = 0; i < g->target->getVectorWidth(); ++i)
vals.push_back(v);
return llvm::ConstantVector::get(vals);
}
llvm::Constant *
LLVMInt64Vector(const int64_t *ivec) {
std::vector<llvm::Constant *> vals;
for (int i = 0; i < g->target->getVectorWidth(); ++i)
vals.push_back(LLVMInt64(ivec[i]));
return llvm::ConstantVector::get(vals);
}
llvm::Constant *
LLVMUInt64Vector(uint64_t ival) {
llvm::Constant *v = LLVMUInt64(ival);
std::vector<llvm::Constant *> vals;
for (int i = 0; i < g->target->getVectorWidth(); ++i)
vals.push_back(v);
return llvm::ConstantVector::get(vals);
}
llvm::Constant *
LLVMUInt64Vector(const uint64_t *ivec) {
std::vector<llvm::Constant *> vals;
for (int i = 0; i < g->target->getVectorWidth(); ++i)
vals.push_back(LLVMUInt64(ivec[i]));
return llvm::ConstantVector::get(vals);
}
llvm::Constant *
LLVMBoolVector(bool b) {
llvm::Constant *v;
if (LLVMTypes::BoolVectorType == LLVMTypes::Int64VectorType)
v = llvm::ConstantInt::get(LLVMTypes::Int64Type, b ? 0xffffffffffffffffull : 0,
false /*unsigned*/);
else if (LLVMTypes::BoolVectorType == LLVMTypes::Int32VectorType)
v = llvm::ConstantInt::get(LLVMTypes::Int32Type, b ? 0xffffffff : 0,
false /*unsigned*/);
else if (LLVMTypes::BoolVectorType == LLVMTypes::Int16VectorType)
v = llvm::ConstantInt::get(LLVMTypes::Int16Type, b ? 0xffff : 0,
false /*unsigned*/);
else if (LLVMTypes::BoolVectorType == LLVMTypes::Int8VectorType)
v = llvm::ConstantInt::get(LLVMTypes::Int8Type, b ? 0xff : 0,
false /*unsigned*/);
else {
Assert(LLVMTypes::BoolVectorType == LLVMTypes::Int1VectorType);
v = b ? LLVMTrue : LLVMFalse;
}
std::vector<llvm::Constant *> vals;
for (int i = 0; i < g->target->getVectorWidth(); ++i)
vals.push_back(v);
return llvm::ConstantVector::get(vals);
}
llvm::Constant *
LLVMBoolVector(const bool *bvec) {
std::vector<llvm::Constant *> vals;
for (int i = 0; i < g->target->getVectorWidth(); ++i) {
llvm::Constant *v;
if (LLVMTypes::BoolVectorType == LLVMTypes::Int64VectorType)
v = llvm::ConstantInt::get(LLVMTypes::Int64Type, bvec[i] ? 0xffffffffffffffffull : 0,
false /*unsigned*/);
else if (LLVMTypes::BoolVectorType == LLVMTypes::Int32VectorType)
v = llvm::ConstantInt::get(LLVMTypes::Int32Type, bvec[i] ? 0xffffffff : 0,
false /*unsigned*/);
else if (LLVMTypes::BoolVectorType == LLVMTypes::Int16VectorType)
v = llvm::ConstantInt::get(LLVMTypes::Int16Type, bvec[i] ? 0xffff : 0,
false /*unsigned*/);
else if (LLVMTypes::BoolVectorType == LLVMTypes::Int8VectorType)
v = llvm::ConstantInt::get(LLVMTypes::Int8Type, bvec[i] ? 0xff : 0,
false /*unsigned*/);
else {
Assert(LLVMTypes::BoolVectorType == LLVMTypes::Int1VectorType);
v = bvec[i] ? LLVMTrue : LLVMFalse;
}
vals.push_back(v);
}
return llvm::ConstantVector::get(vals);
}
llvm::Constant *
LLVMIntAsType(int64_t val, llvm::Type *type) {
llvm::VectorType *vecType =
llvm::dyn_cast<llvm::VectorType>(type);
if (vecType != NULL) {
llvm::Constant *v = llvm::ConstantInt::get(vecType->getElementType(),
val, true /* signed */);
std::vector<llvm::Constant *> vals;
for (int i = 0; i < (int)vecType->getNumElements(); ++i)
vals.push_back(v);
return llvm::ConstantVector::get(vals);
}
else
return llvm::ConstantInt::get(type, val, true /* signed */);
}
llvm::Constant *
LLVMUIntAsType(uint64_t val, llvm::Type *type) {
llvm::VectorType *vecType =
llvm::dyn_cast<llvm::VectorType>(type);
if (vecType != NULL) {
llvm::Constant *v = llvm::ConstantInt::get(vecType->getElementType(),
val, false /* unsigned */);
std::vector<llvm::Constant *> vals;
for (int i = 0; i < (int)vecType->getNumElements(); ++i)
vals.push_back(v);
return llvm::ConstantVector::get(vals);
}
else
return llvm::ConstantInt::get(type, val, false /* unsigned */);
}
/** Conservative test to see if two llvm::Values are equal. There are
(potentially many) cases where the two values actually are equal but
this will return false. However, if it does return true, the two
vectors definitely are equal.
*/
static bool
lValuesAreEqual(llvm::Value *v0, llvm::Value *v1,
std::vector<llvm::PHINode *> &seenPhi0,
std::vector<llvm::PHINode *> &seenPhi1) {
// Thanks to the fact that LLVM hashes and returns the same pointer for
// constants (of all sorts, even constant expressions), this first test
// actually catches a lot of cases. LLVM's SSA form also helps a lot
// with this..
if (v0 == v1)
return true;
Assert(seenPhi0.size() == seenPhi1.size());
for (unsigned int i = 0; i < seenPhi0.size(); ++i)
if (v0 == seenPhi0[i] && v1 == seenPhi1[i])
return true;
llvm::BinaryOperator *bo0 = llvm::dyn_cast<llvm::BinaryOperator>(v0);
llvm::BinaryOperator *bo1 = llvm::dyn_cast<llvm::BinaryOperator>(v1);
if (bo0 != NULL && bo1 != NULL) {
if (bo0->getOpcode() != bo1->getOpcode())
return false;
return (lValuesAreEqual(bo0->getOperand(0), bo1->getOperand(0),
seenPhi0, seenPhi1) &&
lValuesAreEqual(bo0->getOperand(1), bo1->getOperand(1),
seenPhi0, seenPhi1));
}
llvm::CastInst *cast0 = llvm::dyn_cast<llvm::CastInst>(v0);
llvm::CastInst *cast1 = llvm::dyn_cast<llvm::CastInst>(v1);
if (cast0 != NULL && cast1 != NULL) {
if (cast0->getOpcode() != cast1->getOpcode())
return false;
return lValuesAreEqual(cast0->getOperand(0), cast1->getOperand(0),
seenPhi0, seenPhi1);
}
llvm::PHINode *phi0 = llvm::dyn_cast<llvm::PHINode>(v0);
llvm::PHINode *phi1 = llvm::dyn_cast<llvm::PHINode>(v1);
if (phi0 != NULL && phi1 != NULL) {
if (phi0->getNumIncomingValues() != phi1->getNumIncomingValues())
return false;
seenPhi0.push_back(phi0);
seenPhi1.push_back(phi1);
unsigned int numIncoming = phi0->getNumIncomingValues();
// Check all of the incoming values: if all of them are all equal,
// then we're good.
bool anyFailure = false;
for (unsigned int i = 0; i < numIncoming; ++i) {
// FIXME: should it be ok if the incoming blocks are different,
// where we just return faliure in this case?
Assert(phi0->getIncomingBlock(i) == phi1->getIncomingBlock(i));
if (!lValuesAreEqual(phi0->getIncomingValue(i),
phi1->getIncomingValue(i), seenPhi0, seenPhi1)) {
anyFailure = true;
break;
}
}
seenPhi0.pop_back();
seenPhi1.pop_back();
return !anyFailure;
}
return false;
}
/** Given an llvm::Value known to be an integer, return its value as
an int64_t.
*/
static int64_t
lGetIntValue(llvm::Value *offset) {
llvm::ConstantInt *intOffset = llvm::dyn_cast<llvm::ConstantInt>(offset);
Assert(intOffset && (intOffset->getBitWidth() == 32 ||
intOffset->getBitWidth() == 64));
return intOffset->getSExtValue();
}
llvm::Value *
LLVMFlattenInsertChain(llvm::Value *inst, int vectorWidth,
bool compare, bool undef) {
llvm::Value ** elements = new llvm::Value*[vectorWidth];
for (int i = 0; i < vectorWidth; ++i) {
elements[i] = NULL;
}
// Catch a pattern of InsertElement chain.
if (llvm::InsertElementInst *ie =
llvm::dyn_cast<llvm::InsertElementInst>(inst)) {
//Gather elements of vector
while (ie != NULL) {
int64_t iOffset = lGetIntValue(ie->getOperand(2));
Assert(iOffset >= 0 && iOffset < vectorWidth);
// Get the scalar value from this insert
if (elements[iOffset] == NULL) {
elements[iOffset] = ie->getOperand(1);
}
// Do we have another insert?
llvm::Value *insertBase = ie->getOperand(0);
ie = llvm::dyn_cast<llvm::InsertElementInst>(insertBase);
if (ie != NULL) {
continue;
}
if (llvm::isa<llvm::UndefValue>(insertBase)) {
break;
}
if (llvm::isa<llvm::ConstantVector>(insertBase) ||
llvm::isa<llvm::ConstantAggregateZero>(insertBase)) {
llvm::Constant *cv = llvm::dyn_cast<llvm::Constant>(insertBase);
Assert(vectorWidth == (int)(cv->getNumOperands()));
for (int i=0; i<vectorWidth; i++) {
if (elements[i] == NULL) {
elements[i] = cv->getOperand(i);
}
}
break;
}
else {
// Here chain ends in llvm::LoadInst or some other.
// They are not equal to each other so we should return NULL if compare
// and first element if we have it.
Assert(compare == true || elements[0] != NULL);
if (compare) {
return NULL;
}
else {
return elements[0];
}
}
// TODO: Also, should we handle some other values like
// ConstantDataVectors.
}
if (compare == false) {
//We simply want first element
return elements[0];
}
int null_number = 0;
int NonNull = 0;
for(int i = 0; i < vectorWidth; i++) {
if (elements[i] == NULL) {
null_number++;
}
else {
NonNull = i;
}
}
if (null_number == vectorWidth) {
//All of elements are NULLs
return NULL;
}
if ((undef == false) && (null_number != 0)) {
//We don't want NULLs in chain, but we have them
return NULL;
}
// Compare elements of vector
for (int i = 0; i < vectorWidth; i++) {
if (elements[i] == NULL) {
continue;
}
std::vector<llvm::PHINode *> seenPhi0;
std::vector<llvm::PHINode *> seenPhi1;
if (lValuesAreEqual(elements[NonNull], elements[i],
seenPhi0, seenPhi1) == false) {
return NULL;
}
}
return elements[NonNull];
}
// Catch a pattern of broadcast implemented as InsertElement + Shuffle:
// %broadcast_init.0 = insertelement <4 x i32> undef, i32 %val, i32 0
// %broadcast.1 = shufflevector <4 x i32> %smear.0, <4 x i32> undef,
// <4 x i32> zeroinitializer
else if (llvm::ShuffleVectorInst *shuf =
llvm::dyn_cast<llvm::ShuffleVectorInst>(inst)) {
llvm::Value *indices = shuf->getOperand(2);
if (llvm::isa<llvm::ConstantAggregateZero>(indices)) {
llvm::Value *op = shuf->getOperand(0);
llvm::InsertElementInst *ie = llvm::dyn_cast<llvm::InsertElementInst>(op);
if (ie != NULL &&
llvm::isa<llvm::UndefValue>(ie->getOperand(0))) {
llvm::ConstantInt *ci =
llvm::dyn_cast<llvm::ConstantInt>(ie->getOperand(2));
if (ci->isZero()) {
return ie->getOperand(1);
}
}
}
}
return NULL;
}
bool
LLVMExtractVectorInts(llvm::Value *v, int64_t ret[], int *nElts) {
// Make sure we do in fact have a vector of integer values here
llvm::VectorType *vt =
llvm::dyn_cast<llvm::VectorType>(v->getType());
Assert(vt != NULL);
Assert(llvm::isa<llvm::IntegerType>(vt->getElementType()));
*nElts = (int)vt->getNumElements();
if (llvm::isa<llvm::ConstantAggregateZero>(v)) {
for (int i = 0; i < (int)vt->getNumElements(); ++i)
ret[i] = 0;
return true;
}
llvm::ConstantDataVector *cv = llvm::dyn_cast<llvm::ConstantDataVector>(v);
if (cv == NULL)
return false;
for (int i = 0; i < (int)cv->getNumElements(); ++i)
ret[i] = cv->getElementAsInteger(i);
return true;
}
static bool
lVectorValuesAllEqual(llvm::Value *v, int vectorLength,
std::vector<llvm::PHINode *> &seenPhis);
/** This function checks to see if the given (scalar or vector) value is an
exact multiple of baseValue. It returns true if so, and false if not
(or if it's not able to determine if it is). Any vector value passed
in is required to have the same value in all elements (so that we can
just check the first element to be a multiple of the given value.)
*/
static bool
lIsExactMultiple(llvm::Value *val, int baseValue, int vectorLength,
std::vector<llvm::PHINode *> &seenPhis) {
if (llvm::isa<llvm::VectorType>(val->getType()) == false) {
// If we've worked down to a constant int, then the moment of truth
// has arrived...
llvm::ConstantInt *ci = llvm::dyn_cast<llvm::ConstantInt>(val);
if (ci != NULL)
return (ci->getZExtValue() % baseValue) == 0;
}
else
Assert(LLVMVectorValuesAllEqual(val));
if (llvm::isa<llvm::InsertElementInst>(val) ||
llvm::isa<llvm::ShuffleVectorInst>(val)) {
llvm::Value *element = LLVMFlattenInsertChain(val, g->target->getVectorWidth());
// We just need to check the scalar first value, since we know that
// all elements are equal
return lIsExactMultiple(element, baseValue, vectorLength, seenPhis);
}
llvm::PHINode *phi = llvm::dyn_cast<llvm::PHINode>(val);
if (phi != NULL) {
for (unsigned int i = 0; i < seenPhis.size(); ++i)
if (phi == seenPhis[i])
return true;
seenPhis.push_back(phi);
unsigned int numIncoming = phi->getNumIncomingValues();
// Check all of the incoming values: if all of them pass, then
// we're good.
for (unsigned int i = 0; i < numIncoming; ++i) {
llvm::Value *incoming = phi->getIncomingValue(i);
bool mult = lIsExactMultiple(incoming, baseValue, vectorLength,
seenPhis);
if (mult == false) {
seenPhis.pop_back();
return false;
}
}
seenPhis.pop_back();
return true;
}
llvm::BinaryOperator *bop = llvm::dyn_cast<llvm::BinaryOperator>(val);
if (bop != NULL && bop->getOpcode() == llvm::Instruction::Add) {
llvm::Value *op0 = bop->getOperand(0);
llvm::Value *op1 = bop->getOperand(1);
bool be0 = lIsExactMultiple(op0, baseValue, vectorLength, seenPhis);
bool be1 = lIsExactMultiple(op1, baseValue, vectorLength, seenPhis);
return (be0 && be1);
}
// FIXME: mul? casts? ... ?
return false;
}
/** Returns the next power of two greater than or equal to the given
value. */
static int
lRoundUpPow2(int v) {
v--;
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
return v+1;
}
/** Try to determine if all of the elements of the given vector value have
the same value when divided by the given baseValue. The function
returns true if this can be determined to be the case, and false
otherwise. (This function may fail to identify some cases where it
does in fact have this property, but should never report a given value
as being a multiple if it isn't!)
*/
static bool
lAllDivBaseEqual(llvm::Value *val, int64_t baseValue, int vectorLength,
std::vector<llvm::PHINode *> &seenPhis,
bool &canAdd) {
Assert(llvm::isa<llvm::VectorType>(val->getType()));
// Make sure the base value is a positive power of 2
Assert(baseValue > 0 && (baseValue & (baseValue-1)) == 0);
// The easy case
if (lVectorValuesAllEqual(val, vectorLength, seenPhis))
return true;
int64_t vecVals[ISPC_MAX_NVEC];
int nElts;
if (llvm::isa<llvm::VectorType>(val->getType()) &&
LLVMExtractVectorInts(val, vecVals, &nElts)) {
// If we have a vector of compile-time constant integer values,
// then go ahead and check them directly..
int64_t firstDiv = vecVals[0] / baseValue;
for (int i = 1; i < nElts; ++i)
if ((vecVals[i] / baseValue) != firstDiv)
return false;
return true;
}
llvm::PHINode *phi = llvm::dyn_cast<llvm::PHINode>(val);
if (phi != NULL) {
for (unsigned int i = 0; i < seenPhis.size(); ++i)
if (phi == seenPhis[i])
return true;
seenPhis.push_back(phi);
unsigned int numIncoming = phi->getNumIncomingValues();
// Check all of the incoming values: if all of them pass, then
// we're good.
for (unsigned int i = 0; i < numIncoming; ++i) {
llvm::Value *incoming = phi->getIncomingValue(i);
bool ca = canAdd;
bool mult = lAllDivBaseEqual(incoming, baseValue, vectorLength,
seenPhis, ca);
if (mult == false) {
seenPhis.pop_back();
return false;
}
}
seenPhis.pop_back();
return true;
}
llvm::BinaryOperator *bop = llvm::dyn_cast<llvm::BinaryOperator>(val);
if (bop != NULL && bop->getOpcode() == llvm::Instruction::Add &&
canAdd == true) {
llvm::Value *op0 = bop->getOperand(0);
llvm::Value *op1 = bop->getOperand(1);
// Otherwise we're only going to worry about the following case,
// which comes up often when looping over SOA data:
// ashr %val, <constant shift>
// where %val = add %smear, <0,1,2,3...>
// and where the maximum of the <0,...> vector in the add is less than
// 1<<(constant shift),
// and where %smear is a smear of a value that is a multiple of
// baseValue.
int64_t addConstants[ISPC_MAX_NVEC];
if (LLVMExtractVectorInts(op1, addConstants, &nElts) == false)
return false;
Assert(nElts == vectorLength);
// Do all of them give the same value when divided by baseValue?
int64_t firstConstDiv = addConstants[0] / baseValue;
for (int i = 1; i < vectorLength; ++i)
if ((addConstants[i] / baseValue) != firstConstDiv)
return false;
if (lVectorValuesAllEqual(op0, vectorLength, seenPhis) == false)
return false;
// Note that canAdd is a reference parameter; setting this ensures
// that we don't allow multiple adds in other parts of the chain of
// dependent values from here.
canAdd = false;
// Now we need to figure out the required alignment (in numbers of
// elements of the underlying type being indexed) of the value to
// which these integer addConstant[] values are being added to. We
// know that we have addConstant[] values that all give the same
// value when divided by baseValue, but we may need a less-strict