[llvm-commits] [llvm] r98897 - in /llvm/trunk/utils/TableGen: CodeGenDAGPatterns.cpp CodeGenDAGPatterns.h
Chris Lattner
sabre at nondot.org
Thu Mar 18 16:15:10 PDT 2010
Author: lattner
Date: Thu Mar 18 18:15:10 2010
New Revision: 98897
URL: http://llvm.org/viewvc/llvm-project?rev=98897&view=rev
Log:
infer results of a pattern from implicit defs. This allows you to do something
like this:
def : Pat<(add ...),
(FOOINST)>;
When fooinst only has a single implicit def (e.g. to R1). This will be handled
as if written as (set R1, (FOOINST ...))
Modified:
llvm/trunk/utils/TableGen/CodeGenDAGPatterns.cpp
llvm/trunk/utils/TableGen/CodeGenDAGPatterns.h
Modified: llvm/trunk/utils/TableGen/CodeGenDAGPatterns.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/utils/TableGen/CodeGenDAGPatterns.cpp?rev=98897&r1=98896&r2=98897&view=diff
==============================================================================
--- llvm/trunk/utils/TableGen/CodeGenDAGPatterns.cpp (original)
+++ llvm/trunk/utils/TableGen/CodeGenDAGPatterns.cpp Thu Mar 18 18:15:10 2010
@@ -1136,34 +1136,47 @@
if (getOperator()->isSubClassOf("Instruction")) {
const DAGInstruction &Inst = CDP.getInstruction(getOperator());
- bool MadeChange = false;
unsigned NumResults = Inst.getNumResults();
-
assert(NumResults <= 1 &&
"Only supports zero or one result instrs!");
CodeGenInstruction &InstInfo =
CDP.getTargetInfo().getInstruction(getOperator()->getName());
+
+ EEVT::TypeSet ResultType;
+
// Apply the result type to the node
- if (InstInfo.NumDefs == 0) { // # of elements in (outs) list
- MadeChange = UpdateNodeType(MVT::isVoid, TP);
- } else {
+ if (InstInfo.NumDefs != 0) { // # of elements in (outs) list
Record *ResultNode = Inst.getResult(0);
if (ResultNode->isSubClassOf("PointerLikeRegClass")) {
- MadeChange = UpdateNodeType(MVT::iPTR, TP);
+ ResultType = EEVT::TypeSet(MVT::iPTR, TP);
} else if (ResultNode->getName() == "unknown") {
// Nothing to do.
} else {
assert(ResultNode->isSubClassOf("RegisterClass") &&
"Operands should be register classes!");
-
const CodeGenRegisterClass &RC =
CDP.getTargetInfo().getRegisterClass(ResultNode);
- MadeChange = UpdateNodeType(RC.getValueTypes(), TP);
+ ResultType = RC.getValueTypes();
}
+ } else if (!InstInfo.ImplicitDefs.empty()) {
+ // If the instruction has implicit defs, the first one defines the result
+ // type.
+ assert(InstInfo.ImplicitDefs[0]->isSubClassOf("Register"));
+ Record *FirstImplicitDef = InstInfo.ImplicitDefs[0];
+ const std::vector<MVT::SimpleValueType> &RegVTs =
+ CDP.getTargetInfo().getRegisterVTs(FirstImplicitDef);
+ if (!RegVTs.empty())
+ ResultType = EEVT::TypeSet(RegVTs);
+ } else {
+ // Otherwise, the instruction produces no value result.
+ // FIXME: Model "no result" different than "one result that is void"
+ ResultType = EEVT::TypeSet(MVT::isVoid, TP);
}
+ bool MadeChange = UpdateNodeType(ResultType, TP);
+
// If this is an INSERT_SUBREG, constrain the source and destination VTs to
// be the same.
if (getOperator()->getName() == "INSERT_SUBREG") {
@@ -2451,14 +2464,19 @@
InferredAllResultTypes =
Result->InferAllTypes(&Pattern->getNamedNodesMap());
+ IterateInference = false;
+
// Apply the type of the result to the source pattern. This helps us
// resolve cases where the input type is known to be a pointer type (which
// is considered resolved), but the result knows it needs to be 32- or
// 64-bits. Infer the other way for good measure.
- IterateInference = Pattern->getTree(0)->
- UpdateNodeType(Result->getTree(0)->getExtType(), *Result);
- IterateInference |= Result->getTree(0)->
- UpdateNodeType(Pattern->getTree(0)->getExtType(), *Result);
+ if (!Result->getTree(0)->getExtType().isVoid() &&
+ !Pattern->getTree(0)->getExtType().isVoid()) {
+ IterateInference = Pattern->getTree(0)->
+ UpdateNodeType(Result->getTree(0)->getExtType(), *Result);
+ IterateInference |= Result->getTree(0)->
+ UpdateNodeType(Pattern->getTree(0)->getExtType(), *Result);
+ }
// If our iteration has converged and the input pattern's types are fully
// resolved but the result pattern is not fully resolved, we may have a
@@ -2473,7 +2491,6 @@
!InferredAllResultTypes)
IterateInference = ForceArbitraryInstResultType(Result->getTree(0),
*Result);
-
} while (IterateInference);
// Verify that we inferred enough types that we can do something with the
Modified: llvm/trunk/utils/TableGen/CodeGenDAGPatterns.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/utils/TableGen/CodeGenDAGPatterns.h?rev=98897&r1=98896&r2=98897&view=diff
==============================================================================
--- llvm/trunk/utils/TableGen/CodeGenDAGPatterns.h (original)
+++ llvm/trunk/utils/TableGen/CodeGenDAGPatterns.h Thu Mar 18 18:15:10 2010
@@ -88,6 +88,10 @@
return TypeVec;
}
+ bool isVoid() const {
+ return TypeVec.size() == 1 && TypeVec[0] == MVT::isVoid;
+ }
+
/// hasIntegerTypes - Return true if this TypeSet contains any integer value
/// types.
bool hasIntegerTypes() const;
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