Add OPC_CheckChildSame0-3 to the DAG isel matcher. This replaces sequences of MoveChild, CheckSame, MoveParent. Saves 846 bytes from the X86 DAG isel matcher, ~300 from ARM, ~840 from Hexagon.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192026 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/DAGISelMatcher.h b/utils/TableGen/DAGISelMatcher.h
index ebac790..70031fa 100644
--- a/utils/TableGen/DAGISelMatcher.h
+++ b/utils/TableGen/DAGISelMatcher.h
@@ -55,6 +55,7 @@
// Predicate checking.
CheckSame, // Fail if not same as prev match.
+ CheckChildSame, // Fail if child not same as prev match.
CheckPatternPredicate,
CheckPredicate, // Fail if node predicate fails.
CheckOpcode, // Fail if not opcode.
@@ -122,6 +123,7 @@
switch (getKind()) {
default: return false;
case CheckSame:
+ case CheckChildSame:
case CheckPatternPredicate:
case CheckPredicate:
case CheckOpcode:
@@ -392,6 +394,34 @@
virtual unsigned getHashImpl() const { return getMatchNumber(); }
};
+/// CheckChildSameMatcher - This checks to see if child node is exactly the same
+/// node as the specified match that was recorded with 'Record'. This is used
+/// when patterns have the same name in them, like '(mul GPR:$in, GPR:$in)'.
+class CheckChildSameMatcher : public Matcher {
+ unsigned ChildNo;
+ unsigned MatchNumber;
+public:
+ CheckChildSameMatcher(unsigned childno, unsigned matchnumber)
+ : Matcher(CheckChildSame), ChildNo(childno), MatchNumber(matchnumber) {}
+
+ unsigned getChildNo() const { return ChildNo; }
+ unsigned getMatchNumber() const { return MatchNumber; }
+
+ static inline bool classof(const Matcher *N) {
+ return N->getKind() == CheckChildSame;
+ }
+
+ virtual bool isSafeToReorderWithPatternPredicate() const { return true; }
+
+private:
+ virtual void printImpl(raw_ostream &OS, unsigned indent) const;
+ virtual bool isEqualImpl(const Matcher *M) const {
+ return cast<CheckChildSameMatcher>(M)->ChildNo == ChildNo &&
+ cast<CheckChildSameMatcher>(M)->MatchNumber == MatchNumber;
+ }
+ virtual unsigned getHashImpl() const { return (MatchNumber << 2) | ChildNo; }
+};
+
/// CheckPatternPredicateMatcher - This checks the target-specific predicate
/// to see if the entire pattern is capable of matching. This predicate does
/// not take a node as input. This is used for subtarget feature checks etc.