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Let each target specific isel provide routine to check if a chain producing node is foldable by another.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29335 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2006-07-27 06:36:49 +00:00
parent 55b5053b8e
commit b2c121ac14
2 changed files with 7 additions and 9 deletions
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4
include/llvm/CodeGen/SelectionDAGISel.h
View File

@ -63,6 +63,10 @@ public:
return true;
}
/// IsFoldableBy - Returns true if the specific operand node N of U can be
/// folded during instruction selection?
virtual bool IsFoldableBy(SDNode *N, SDNode *U) { return true; }
/// CreateTargetHazardRecognizer - Return a newly allocated hazard recognizer
/// to use for this target when scheduling the DAG.
virtual HazardRecognizer *CreateTargetHazardRecognizer();

10
utils/TableGen/DAGISelEmitter.cpp
View File

@ -2280,14 +2280,8 @@ public:
PInfo.hasProperty(SDNodeInfo::SDNPHasChain) ||
PInfo.hasProperty(SDNodeInfo::SDNPInFlag) ||
PInfo.hasProperty(SDNodeInfo::SDNPOptInFlag))
if (PInfo.getNumOperands() > 1) {
emitCheck("!isNonImmUse(" + ParentName + ".Val, " + RootName +
".Val)");
} else {
emitCheck("(" + ParentName + ".getNumOperands() == 1 || !" +
"isNonImmUse(" + ParentName + ".Val, " + RootName +
".Val))");
}
emitCheck("IsFoldableBy(" + RootName + ".Val, " + ParentName +
".Val)");
}
}