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/*========================== begin_copyright_notice ============================
Copyright (C) 2020-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
//
/// GenXInlineAsmLowering
/// ------------
/// This pass recreates VISA inline assembly with new types
/// if 'cr' constraint is used. Also pass inserts constraints
/// information as metadata in order not to parse constraints
/// string every time in each pass where this information is needed.
///
//===----------------------------------------------------------------------===//
#include "GenX.h"
#include "GenXGotoJoin.h"
#include "GenXIntrinsics.h"
#include "GenXModule.h"
#include "GenXSubtarget.h"
#include "GenXUtil.h"
#include "GenXVisa.h"
#include "llvmWrapper/IR/DerivedTypes.h"
#include "llvmWrapper/IR/Instructions.h"
#include "visa_igc_common_header.h"
#include "llvm/ADT/PostOrderIterator.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/Analysis/CFG.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/InstIterator.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/Module.h"
#include "llvm/Pass.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "Probe/Assertion.h"
using namespace llvm;
using namespace genx;
namespace {
class GenXInlineAsmLowering : public FunctionPass {
using ConstraintInfoVector = InlineAsm::ConstraintInfoVector;
using ConstraintInfo = InlineAsm::ConstraintInfo;
using GenXConstraintInfoVector = std::vector<GenXInlineAsmInfo>;
private:
LLVMContext *Context = nullptr;
SmallVector<Instruction *, 8> ToErase;
MDNode *createInlineAsmMetadata(
CallInst *CI,
const InlineAsm::ConstraintInfoVector &ConstraintsInfo) const;
Type *rewriteTypeForConstraintIfNeeded(
Type *Ty, const GenXInlineAsmInfo &ConstraintInfo) const;
Type *rewriteTypeForCR(Type *CRType) const;
FunctionType *rewriteFunctionTypeForInlineAsmIfNeeded(
CallInst *CI, const GenXConstraintInfoVector &ConstraintsInfo) const;
void replaceInlineAsmUses(CallInst *Of, CallInst *With,
const GenXConstraintInfoVector &ConstraintsInfo);
CallInst *
recreateInlineAsmWithCR(CallInst *CI,
const GenXConstraintInfoVector &ConstraintsInfo);
public:
static char ID;
explicit GenXInlineAsmLowering() : FunctionPass(ID) {}
StringRef getPassName() const override {
return "GenX VISA inline asm lowering";
}
void getAnalysisUsage(AnalysisUsage &AU) const override;
bool runOnFunction(Function &F) override;
};
} // end namespace
char GenXInlineAsmLowering::ID = 0;
namespace llvm {
void initializeGenXInlineAsmLoweringPass(PassRegistry &);
}
INITIALIZE_PASS_BEGIN(GenXInlineAsmLowering, "GenXInlineAsmLowering",
"GenXInlineAsmLowering", false, false)
INITIALIZE_PASS_END(GenXInlineAsmLowering, "GenXInlineAsmLowering",
"GenXInlineAsmLowering", false, false)
FunctionPass *llvm::createGenXInlineAsmLoweringPass() {
initializeGenXInlineAsmLoweringPass(*PassRegistry::getPassRegistry());
return new GenXInlineAsmLowering;
}
void GenXInlineAsmLowering::getAnalysisUsage(AnalysisUsage &AU) const {
AU.addPreserved<GenXModule>();
}
bool GenXInlineAsmLowering::runOnFunction(Function &F) {
auto GM = getAnalysisIfAvailable<GenXModule>();
if (GM && !GM->HasInlineAsm())
return false;
// Collect inline asm worklist
auto InlineAsmsToProcess =
make_filter_range(instructions(&F), [&](Instruction &I) {
auto *CI = dyn_cast<CallInst>(&I);
// No need to process inline asm with empty constraint string
return CI && CI->isInlineAsm() &&
!cast<InlineAsm>(IGCLLVM::getCalledValue(CI))
->getConstraintString()
.empty();
});
SmallVector<CallInst *, 8> InlineAsms;
llvm::transform(InlineAsmsToProcess, std::back_inserter(InlineAsms),
[&](Instruction &I) { return cast<CallInst>(&I); });
if (InlineAsms.empty())
return false;
Context = &InlineAsms[0]->getContext();
for (auto *CI : InlineAsms) {
auto *IA = cast<InlineAsm>(IGCLLVM::getCalledValue(CI));
InlineAsm::ConstraintInfoVector ConstraintsInfo = IA->ParseConstraints();
MDNode *ConstraintsMD = createInlineAsmMetadata(CI, ConstraintsInfo);
GenXConstraintInfoVector GenXConstraintsInfo =
genx::getGenXInlineAsmInfo(ConstraintsMD);
// No need to recreate asm expression if
// there is no 'cr' constraint. Set created metadata and return.
if (!genx::hasConstraintOfType(GenXConstraintsInfo,
ConstraintType::Constraint_cr)) {
CI->setMetadata(genx::MD_genx_inline_asm_info, ConstraintsMD);
continue;
}
// Create new inline asm and don't forget to set
// earlier created metadata.
CallInst *NewCI = recreateInlineAsmWithCR(CI, GenXConstraintsInfo);
NewCI->setMetadata(genx::MD_genx_inline_asm_info, ConstraintsMD);
}
for (auto *I : ToErase)
I->eraseFromParent();
ToErase.clear();
return true;
}
// Creating metadata for inline asm constraints
// in order not to parse constraints string every time in each pass
// where this information is needed.
MDNode *GenXInlineAsmLowering::createInlineAsmMetadata(
CallInst *CI, const ConstraintInfoVector &ConstraintsInfo) const {
IGC_ASSERT_MESSAGE(!ConstraintsInfo.empty(), "Non empty constraints expected");
IGC_ASSERT_MESSAGE(CI->isInlineAsm(), "Inline asm expected");
Type *Int1Ty = Type::getInt1Ty(*Context);
Type *Int32Ty = Type::getInt32Ty(*Context);
std::vector<Metadata *> Entries;
for (auto &&Info : ConstraintsInfo) {
std::string Codes;
if (genx::isInlineAsmMatchingInputConstraint(Info))
Codes = genx::getInlineAsmCodes(
ConstraintsInfo[genx::getInlineAsmMatchedOperand(Info)]);
else
Codes = genx::getInlineAsmCodes(Info);
genx::ConstraintType CTy = genx::getInlineAsmConstraintType(Codes);
if (CTy == ConstraintType::Constraint_unknown)
Context->emitError(CI, "Unsupported constraint '" + Codes +
"' in inline assembly");
Metadata *EntryMD[3] = {
ConstantAsMetadata::get(
ConstantInt::get(Int32Ty, static_cast<uint32_t>(CTy))),
ConstantAsMetadata::get(ConstantInt::get(Int32Ty, Info.MatchingInput)),
ConstantAsMetadata::get(ConstantInt::get(
Int1Ty, (Info.Type == InlineAsm::ConstraintPrefix::isOutput)))};
Entries.push_back(MDNode::get(*Context, EntryMD));
}
return MDTuple::get(*Context, Entries);
}
Type *GenXInlineAsmLowering::rewriteTypeForConstraintIfNeeded(
Type *Ty, const GenXInlineAsmInfo &ConstraintInfo) const {
switch (ConstraintInfo.getConstraintType()) {
default:
return Ty;
case ConstraintType::Constraint_cr:
return rewriteTypeForCR(Ty);
}
}
Type *GenXInlineAsmLowering::rewriteTypeForCR(Type *CRType) const {
IGC_ASSERT_MESSAGE(CRType->isIntOrIntVectorTy(),
"Expected integer inputs for 'cr' constraint");
Type *Int1Ty = Type::getInt1Ty(*Context);
return CRType->isVectorTy()
? IGCLLVM::FixedVectorType::get(
Int1Ty,
cast<IGCLLVM::FixedVectorType>(CRType)->getNumElements())
: Int1Ty;
}
// If there exist 'cr' for now output a new result type must be constructed
FunctionType *GenXInlineAsmLowering::rewriteFunctionTypeForInlineAsmIfNeeded(
CallInst *CI, const GenXConstraintInfoVector &ConstraintsInfo) const {
// Rewriting return type
unsigned NumOutputs = genx::getInlineAsmNumOutputs(CI);
std::vector<Type *> NewResultsTypes;
if (NumOutputs == 1) {
NewResultsTypes.push_back(
rewriteTypeForConstraintIfNeeded(CI->getType(), ConstraintsInfo[0]));
} else if (NumOutputs > 1) {
auto *ST = cast<StructType>(CI->getType());
std::transform(ST->element_begin(), ST->element_end(),
ConstraintsInfo.begin(), std::back_inserter(NewResultsTypes),
[&](Type *Ty, const GenXInlineAsmInfo &Info) {
return rewriteTypeForConstraintIfNeeded(Ty, Info);
});
}
// New return type: struct for multiple outputs,
// void for no outputs, and one exact type for single output
Type *NewRetType;
if (NewResultsTypes.empty())
NewRetType = Type::getVoidTy(*Context);
else if (NewResultsTypes.size() == 1)
NewRetType = NewResultsTypes[0];
else
NewRetType = StructType::get(*Context, NewResultsTypes);
// Rewritng params types
std::vector<Type *> NewParamsTypes;
std::transform(CI->arg_begin(), CI->arg_end(),
ConstraintsInfo.begin() + NumOutputs,
std::back_inserter(NewParamsTypes),
[&](Value *V, const GenXInlineAsmInfo &Info) {
return rewriteTypeForConstraintIfNeeded(V->getType(), Info);
});
return FunctionType::get(NewRetType, NewParamsTypes, false);
}
// If result type differs than iterate over all
// users of original call and replace it's
// uses with new outputs. Thus new extractelements and
// zero exstensions might be created. Existing extracts should be eliminated.
void GenXInlineAsmLowering::replaceInlineAsmUses(
CallInst *Of, CallInst *With,
const GenXConstraintInfoVector &ConstraintsInfo) {
if (Of->getType() == With->getType()) {
Of->replaceAllUsesWith(With);
return;
}
IRBuilder<> Builder(*Context);
Builder.SetInsertPoint(With->getNextNode());
unsigned NumOutputs = genx::getInlineAsmNumOutputs(Of);
if (NumOutputs == 1) {
Value *NewResZExt = Builder.CreateZExt(With, Of->getType(), ".asm.zext.cr");
Of->replaceAllUsesWith(NewResZExt);
return;
}
// Create new extractvalues and replace all uses
for (auto *U : Of->users()) {
Value *ToZext = With;
auto *EV = cast<ExtractValueInst>(U);
ToErase.push_back(EV);
unsigned OutputConstraintIdx = EV->getIndices()[0];
ToZext =
Builder.CreateExtractValue(ToZext, OutputConstraintIdx, "asmresult.cr");
// Zero extension needed only for 'cr' output
if (ConstraintsInfo[OutputConstraintIdx].getConstraintType() ==
genx::ConstraintType::Constraint_cr)
ToZext = Builder.CreateZExt(ToZext, U->getType(), ".asmresult.zext.cr");
U->replaceAllUsesWith(ToZext);
}
}
// If inline assembly uses 'cr' constraints (for now)
// all types should be converted to i1. So inserting
// truncations for inputs and zero extensions for outputs.
CallInst *GenXInlineAsmLowering::recreateInlineAsmWithCR(
CallInst *CI, const GenXConstraintInfoVector &ConstraintsInfo) {
IGC_ASSERT_MESSAGE(!ConstraintsInfo.empty(), "Non empty constraints expected");
IGC_ASSERT_MESSAGE(CI->isInlineAsm(), "Inline asm expected");
// If there exist 'cr' output a new result type must be constructed
FunctionType *NewFTy =
rewriteFunctionTypeForInlineAsmIfNeeded(CI, ConstraintsInfo);
// New function types for 'cr':
// any_int -> i1
// <any_int x N> -> <i1 x N>
//
// Create truncation for input args if needed
IRBuilder<> Builder(CI);
std::vector<Value *> NewArgs;
std::transform(CI->arg_begin(), CI->arg_end(), NewFTy->param_begin(),
std::back_inserter(NewArgs), [&](Value *Arg, Type *NewArgTy) {
if (Arg->getType() != NewArgTy)
Arg = Builder.CreateTrunc(Arg, NewArgTy, ".trunc.cr");
return Arg;
});
// Create exactly the same inline assembly but with new function type
auto *IA = cast<InlineAsm>(IGCLLVM::getCalledValue(CI));
InlineAsm *NewIA = InlineAsm::get(
NewFTy, IA->getAsmString(), IA->getConstraintString(),
IA->hasSideEffects(), IA->isAlignStack(), IA->getDialect());
CallInst *NewCI = Builder.CreateCall(NewIA, NewArgs, ".asm.cr");
NewCI->setAttributes(CI->getAttributes());
NewCI->setDebugLoc(CI->getDebugLoc());
replaceInlineAsmUses(CI, NewCI, ConstraintsInfo);
ToErase.push_back(CI);
return NewCI;
}
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