[Tablegen] Add support for the !mul operator.

This is a small addition to arithmetic operations that improves
expressiveness of the language.

Differential Revision: https://reviews.llvm.org/D58775

llvm-svn: 355187

llvm/docs/TableGen/LangIntro.rst

@@ -284,7 +284,7 @@ supported include:
     The usual shift operators. Operations are on 64-bit integers, the result
     is undefined for shift counts outside [0, 63].
 
-``!add(a,b,...)`` ``!and(a,b,...)`` ``!or(a,b,...)``
+``!add(a,b,...)`` ``!mul(a,b,...)`` ``!and(a,b,...)`` ``!or(a,b,...)``
     The usual arithmetic and binary operators.
 
 Note that all of the values have rules specifying how they convert to values

llvm/docs/TableGen/LangRef.rst

@@ -100,7 +100,7 @@ wide variety of meanings:
                :!or     !empty   !subst   !foreach   !strconcat
                :!cast   !listconcat       !size      !foldl
                :!isa    !dag     !le      !lt        !ge
-               :!gt     !ne
+               :!gt     !ne      !mul
 
 TableGen also has !cond operator that needs a slightly different
 syntax compared to other "bang operators":

llvm/include/llvm/TableGen/Record.h

@@ -798,7 +798,7 @@ public:
 /// !op (X, Y) - Combine two inits.
 class BinOpInit : public OpInit, public FoldingSetNode {
 public:
-  enum BinaryOp : uint8_t { ADD, AND, OR, SHL, SRA, SRL, LISTCONCAT,
+  enum BinaryOp : uint8_t { ADD, MUL, AND, OR, SHL, SRA, SRL, LISTCONCAT,
                             STRCONCAT, CONCAT, EQ, NE, LE, LT, GE, GT };
 
 private:

llvm/lib/TableGen/Record.cpp

@@ -930,6 +930,7 @@ Init *BinOpInit::Fold(Record *CurRec) const {
     break;
   }
   case ADD:
+  case MUL:
   case AND:
   case OR:
   case SHL:
@@ -945,6 +946,7 @@ Init *BinOpInit::Fold(Record *CurRec) const {
       switch (getOpcode()) {
       default: llvm_unreachable("Bad opcode!");
       case ADD: Result = LHSv +  RHSv; break;
+      case MUL: Result = LHSv *  RHSv; break;
       case AND: Result = LHSv &  RHSv; break;
       case OR: Result = LHSv | RHSv; break;
       case SHL: Result = LHSv << RHSv; break;
@@ -974,6 +976,7 @@ std::string BinOpInit::getAsString() const {
   switch (getOpcode()) {
   case CONCAT: Result = "!con"; break;
   case ADD: Result = "!add"; break;
+  case MUL: Result = "!mul"; break;
   case AND: Result = "!and"; break;
   case OR: Result = "!or"; break;
   case SHL: Result = "!shl"; break;

llvm/lib/TableGen/TGLexer.cpp

@@ -552,6 +552,7 @@ tgtok::TokKind TGLexer::LexExclaim() {
     .Case("con", tgtok::XConcat)
     .Case("dag", tgtok::XDag)
     .Case("add", tgtok::XADD)
+    .Case("mul", tgtok::XMUL)
     .Case("and", tgtok::XAND)
     .Case("or", tgtok::XOR)
     .Case("shl", tgtok::XSHL)

llvm/lib/TableGen/TGLexer.h

@@ -49,9 +49,9 @@ namespace tgtok {
     MultiClass, String, Defset,
 
     // !keywords.
-    XConcat, XADD, XAND, XOR, XSRA, XSRL, XSHL, XListConcat, XStrConcat, XCast,
+    XConcat, XADD, XMUL, XAND, XOR, XSRA, XSRL, XSHL, XListConcat, XStrConcat,
-    XSubst, XForEach, XFoldl, XHead, XTail, XSize, XEmpty, XIf, XCond, XEq, XIsA, XDag,
+    XCast, XSubst, XForEach, XFoldl, XHead, XTail, XSize, XEmpty, XIf, XCond,
-    XNe, XLe, XLt, XGe, XGt,
+    XEq, XIsA, XDag, XNe, XLe, XLt, XGe, XGt,
 
     // Integer value.
     IntVal,

llvm/lib/TableGen/TGParser.cpp

@@ -1023,6 +1023,7 @@ Init *TGParser::ParseOperation(Record *CurRec, RecTy *ItemType) {
 
   case tgtok::XConcat:
   case tgtok::XADD:
+  case tgtok::XMUL:
   case tgtok::XAND:
   case tgtok::XOR:
   case tgtok::XSRA:
@@ -1045,6 +1046,7 @@ Init *TGParser::ParseOperation(Record *CurRec, RecTy *ItemType) {
     default: llvm_unreachable("Unhandled code!");
     case tgtok::XConcat: Code = BinOpInit::CONCAT; break;
     case tgtok::XADD:    Code = BinOpInit::ADD; break;
+    case tgtok::XMUL:    Code = BinOpInit::MUL; break;
     case tgtok::XAND:    Code = BinOpInit::AND; break;
     case tgtok::XOR:     Code = BinOpInit::OR; break;
     case tgtok::XSRA:    Code = BinOpInit::SRA; break;
@@ -1075,6 +1077,7 @@ Init *TGParser::ParseOperation(Record *CurRec, RecTy *ItemType) {
     case tgtok::XSRL:
     case tgtok::XSHL:
     case tgtok::XADD:
+    case tgtok::XMUL:
       Type = IntRecTy::get();
       ArgType = IntRecTy::get();
       break;
@@ -1154,7 +1157,8 @@ Init *TGParser::ParseOperation(Record *CurRec, RecTy *ItemType) {
         }
         if (Code != BinOpInit::ADD && Code != BinOpInit::AND &&
             Code != BinOpInit::OR && Code != BinOpInit::SRA &&
-            Code != BinOpInit::SRL && Code != BinOpInit::SHL)
+            Code != BinOpInit::SRL && Code != BinOpInit::SHL &&
+            Code != BinOpInit::MUL)
           ArgType = Resolved;
       }
 
@@ -1176,7 +1180,8 @@ Init *TGParser::ParseOperation(Record *CurRec, RecTy *ItemType) {
     // shorthand for nesting them.
     if (Code == BinOpInit::STRCONCAT || Code == BinOpInit::LISTCONCAT ||
         Code == BinOpInit::CONCAT || Code == BinOpInit::ADD ||
-        Code == BinOpInit::AND || Code == BinOpInit::OR) {
+        Code == BinOpInit::AND || Code == BinOpInit::OR ||
+        Code == BinOpInit::MUL) {
       while (InitList.size() > 2) {
         Init *RHS = InitList.pop_back_val();
         RHS = (BinOpInit::get(Code, InitList.back(), RHS, Type))->Fold(CurRec);
@@ -2007,6 +2012,7 @@ Init *TGParser::ParseSimpleValue(Record *CurRec, RecTy *ItemType,
   case tgtok::XConcat:
   case tgtok::XDag:
   case tgtok::XADD:
+  case tgtok::XMUL:
   case tgtok::XAND:
   case tgtok::XOR:
   case tgtok::XSRA:

llvm/test/TableGen/math.td

@@ -35,6 +35,10 @@ def v1025   : Int<!add(v1024.Value, 1)>;
 // CHECK: def v1025
 // CHECK: Value = 1025
 
+// CHECK: def v12
+// CHECK: Value = 12
+def v12   : Int<!mul(4, 3)>;
+
 // CHECK: def v1a
 // CHECK: Value = 1
 
@@ -62,3 +66,11 @@ def v3072 : Int<!or(v1024.Value, v2048.Value)>;
 def v4 : Int<!add(v2.Value, 1, v1.Value)>;
 def v7 : Int<!or(v1.Value, v2.Value, v4.Value)>;
 def v1a : Int<!and(v7.Value, 5, v1.Value)>;
+
+// CHECK: def v84
+// CHECK: Value = 84
+def v84   : Int<!mul(v12.Value, v7.Value)>;
+
+// CHECK: def v924
+// CHECK: Value = 924
+def v924   : Int<!mul(v84.Value, 11)>;