[TableGen] Add predicates for immediates comparison (#76004)

These predicates can be used to represent `<`, `<=`, `>`, `>=`. And a predicate for `in range` is added. (cherry picked from commit 664a0fa)
llvm · Jan 27, 2024 · 7cfa0c1 · 7cfa0c1
1 parent 62877e3
commit 7cfa0c1
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diff --git a/llvm/include/llvm/Target/TargetInstrPredicate.td b/llvm/include/llvm/Target/TargetInstrPredicate.td
@@ -152,6 +152,34 @@ class CheckImmOperand_s<int Index, string Value> : CheckOperandBase<Index> {
   string ImmVal = Value;
 }
 
+// Check that the operand at position `Index` is less than `Imm`.
+// If field `FunctionMapper` is a non-empty string, then function
+// `FunctionMapper` is applied to the operand value, and the return value is then
+// compared against `Imm`.
+class CheckImmOperandLT<int Index, int Imm> : CheckOperandBase<Index> {
+  int ImmVal = Imm;
+}
+
+// Check that the operand at position `Index` is greater than `Imm`.
+// If field `FunctionMapper` is a non-empty string, then function
+// `FunctionMapper` is applied to the operand value, and the return value is then
+// compared against `Imm`.
+class CheckImmOperandGT<int Index, int Imm> : CheckOperandBase<Index> {
+  int ImmVal = Imm;
+}
+
+// Check that the operand at position `Index` is less than or equal to `Imm`.
+// If field `FunctionMapper` is a non-empty string, then function
+// `FunctionMapper` is applied to the operand value, and the return value is then
+// compared against `Imm`.
+class CheckImmOperandLE<int Index, int Imm> : CheckNot<CheckImmOperandGT<Index, Imm>>;
+
+// Check that the operand at position `Index` is greater than or equal to `Imm`.
+// If field `FunctionMapper` is a non-empty string, then function
+// `FunctionMapper` is applied to the operand value, and the return value is then
+// compared against `Imm`.
+class CheckImmOperandGE<int Index, int Imm> : CheckNot<CheckImmOperandLT<Index, Imm>>;
+
 // Expands to a call to `FunctionMapper` if field `FunctionMapper` is set.
 // Otherwise, it expands to a CheckNot<CheckInvalidRegOperand<Index>>.
 class CheckRegOperandSimple<int Index> : CheckOperandBase<Index>;
@@ -203,6 +231,12 @@ class CheckAll<list<MCInstPredicate> Sequence>
 class CheckAny<list<MCInstPredicate> Sequence>
     : CheckPredicateSequence<Sequence>;
 
+// Check that the operand at position `Index` is in range [Start, End].
+// If field `FunctionMapper` is a non-empty string, then function
+// `FunctionMapper` is applied to the operand value, and the return value is then
+// compared against range [Start, End].
+class CheckImmOperandRange<int Index, int Start, int End>
+  : CheckAll<[CheckImmOperandGE<Index, Start>, CheckImmOperandLE<Index, End>]>;
 
 // Used to expand the body of a function predicate. See the definition of
 // TIIPredicate below.

diff --git a/llvm/utils/TableGen/PredicateExpander.cpp b/llvm/utils/TableGen/PredicateExpander.cpp
@@ -59,6 +59,30 @@ void PredicateExpander::expandCheckImmOperandSimple(raw_ostream &OS,
     OS << ")";
 }
 
+void PredicateExpander::expandCheckImmOperandLT(raw_ostream &OS, int OpIndex,
+                                                int ImmVal,
+                                                StringRef FunctionMapper) {
+  if (!FunctionMapper.empty())
+    OS << FunctionMapper << "(";
+  OS << "MI" << (isByRef() ? "." : "->") << "getOperand(" << OpIndex
+     << ").getImm()";
+  if (!FunctionMapper.empty())
+    OS << ")";
+  OS << (shouldNegate() ? " >= " : " < ") << ImmVal;
+}
+
+void PredicateExpander::expandCheckImmOperandGT(raw_ostream &OS, int OpIndex,
+                                                int ImmVal,
+                                                StringRef FunctionMapper) {
+  if (!FunctionMapper.empty())
+    OS << FunctionMapper << "(";
+  OS << "MI" << (isByRef() ? "." : "->") << "getOperand(" << OpIndex
+     << ").getImm()";
+  if (!FunctionMapper.empty())
+    OS << ")";
+  OS << (shouldNegate() ? " <= " : " > ") << ImmVal;
+}
+
 void PredicateExpander::expandCheckRegOperand(raw_ostream &OS, int OpIndex,
                                               const Record *Reg,
                                               StringRef FunctionMapper) {
@@ -352,6 +376,16 @@ void PredicateExpander::expandPredicate(raw_ostream &OS, const Record *Rec) {
                                  Rec->getValueAsString("ImmVal"),
                                  Rec->getValueAsString("FunctionMapper"));
 
+  if (Rec->isSubClassOf("CheckImmOperandLT"))
+    return expandCheckImmOperandLT(OS, Rec->getValueAsInt("OpIndex"),
+                                   Rec->getValueAsInt("ImmVal"),
+                                   Rec->getValueAsString("FunctionMapper"));
+
+  if (Rec->isSubClassOf("CheckImmOperandGT"))
+    return expandCheckImmOperandGT(OS, Rec->getValueAsInt("OpIndex"),
+                                   Rec->getValueAsInt("ImmVal"),
+                                   Rec->getValueAsString("FunctionMapper"));
+
   if (Rec->isSubClassOf("CheckImmOperandSimple"))
     return expandCheckImmOperandSimple(OS, Rec->getValueAsInt("OpIndex"),
                                        Rec->getValueAsString("FunctionMapper"));

diff --git a/llvm/utils/TableGen/PredicateExpander.h b/llvm/utils/TableGen/PredicateExpander.h
@@ -61,6 +61,10 @@ class PredicateExpander {
                              StringRef FunctionMapperer);
   void expandCheckImmOperandSimple(raw_ostream &OS, int OpIndex,
                                    StringRef FunctionMapper);
+  void expandCheckImmOperandLT(raw_ostream &OS, int OpIndex, int ImmVal,
+                               StringRef FunctionMapper);
+  void expandCheckImmOperandGT(raw_ostream &OS, int OpIndex, int ImmVal,
+                               StringRef FunctionMapper);
   void expandCheckRegOperand(raw_ostream &OS, int OpIndex, const Record *Reg,
                              StringRef FunctionMapper);
   void expandCheckRegOperandSimple(raw_ostream &OS, int OpIndex,