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Throw the switch to allow FastISel to emit instructions whose return types different from their inputs. Next step: adding lowering pattens in FastISel that actually use these newly available opcodes.

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llvm-svn: 55349
This commit is contained in:
Owen Anderson 2008-08-26 01:22:59 +00:00
parent 65d29b2553
commit 9c207563a1
1 changed files with 16 additions and 9 deletions
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25
utils/TableGen/FastISelEmitter.cpp
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@ -62,14 +62,15 @@ struct OperandsSignature {
///
bool initialize(TreePatternNode *InstPatNode,
const CodeGenTarget &Target,
MVT::SimpleValueType VT,
const CodeGenRegisterClass *DstRC) {
MVT::SimpleValueType VT) {
if (!InstPatNode->isLeaf() &&
InstPatNode->getOperator()->getName() == "imm") {
Operands.push_back("i");
return true;
}
const CodeGenRegisterClass *DstRC = 0;
for (unsigned i = 0, e = InstPatNode->getNumChildren(); i != e; ++i) {
TreePatternNode *Op = InstPatNode->getChild(i);
// For now, filter out any operand with a predicate.
@ -105,8 +106,11 @@ struct OperandsSignature {
if (!RC)
return false;
// For now, all the operands must have the same register class.
if (DstRC != RC)
return false;
if (DstRC) {
if (DstRC != RC)
return false;
} else
DstRC = RC;
Operands.push_back("r");
}
return true;
@ -220,7 +224,10 @@ void FastISelEmitter::run(std::ostream &OS) {
Record *InstPatOp = InstPatNode->getOperator();
std::string OpcodeName = getOpcodeName(InstPatOp, CGP);
MVT::SimpleValueType VT = InstPatNode->getTypeNum(0);
MVT::SimpleValueType RetVT = InstPatNode->getTypeNum(0);
MVT::SimpleValueType VT = RetVT;
if (InstPatNode->getNumChildren())
VT = InstPatNode->getChild(0)->getTypeNum(0);
// For now, filter out instructions which just set a register to
// an Operand or an immediate, like MOV32ri.
@ -233,7 +240,7 @@ void FastISelEmitter::run(std::ostream &OS) {
// Check all the operands.
OperandsSignature Operands;
if (!Operands.initialize(InstPatNode, Target, VT, DstRC))
if (!Operands.initialize(InstPatNode, Target, VT))
continue;
// Get the predicate that guards this pattern.
@ -244,9 +251,9 @@ void FastISelEmitter::run(std::ostream &OS) {
Pattern.getDstPattern()->getOperator()->getName(),
DstRC
};
assert(!SimplePatterns[Operands][OpcodeName][VT][VT].count(PredicateCheck) &&
assert(!SimplePatterns[Operands][OpcodeName][VT][RetVT].count(PredicateCheck) &&
"Duplicate pattern!");
SimplePatterns[Operands][OpcodeName][VT][VT][PredicateCheck] = Memo;
SimplePatterns[Operands][OpcodeName][VT][RetVT][PredicateCheck] = Memo;
}
// Declare the target FastISel class.
@ -398,7 +405,7 @@ void FastISelEmitter::run(std::ostream &OS) {
// Emit one function for the type that demultiplexes on return type.
OS << "unsigned FastISel::FastEmit_"
<< getLegalCName(Opcode) << "_"
<< getLegalCName(getName(VT));
<< getLegalCName(getName(VT)) << "_";
Operands.PrintManglingSuffix(OS);
OS << "(MVT::SimpleValueType RetVT";
if (!Operands.empty())