[TableGen] ShouldIgnore Pattern bit to disable DAG pattern imports during GISel (#88382)

Added GISelShouldIgnore property to class Pattern in TargetSelectionDAG.td; it's similar to FastISelShouldIgnore. This bit can be put on a record to avoid its pattern import within GlobalISelEmitter. This allows one to avoid the record's GISel .td implementation, .inc generation, and any skipped pattern warnings from -warn-on-skipped-patterns.

1 files changed, 9 insertions, 7 deletions

diff --git a/llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp b/llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp
index 7a5d2be..88d353e 100644
--- a/llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp
+++ b/llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp
@@ -4246,7 +4246,7 @@ static TreePatternNodePtr PromoteXForms(TreePatternNodePtr N) {
 
 void CodeGenDAGPatterns::ParseOnePattern(
     Record *TheDef, TreePattern &Pattern, TreePattern &Result,
-    const std::vector<Record *> &InstImpResults) {
+    const std::vector<Record *> &InstImpResults, bool ShouldIgnore) {
 
   // Inline pattern fragments and expand multiple alternatives.
   Pattern.InlinePatternFragments();
@@ -4332,7 +4332,7 @@ void CodeGenDAGPatterns::ParseOnePattern(
         AddPatternToMatch(&Pattern,
                           PatternToMatch(TheDef, Preds, T, Temp.getOnlyTree(),
                                          InstImpResults, Complexity,
-                                         TheDef->getID()));
+                                         TheDef->getID(), ShouldIgnore));
     }
   } else {
     // Show a message about a dropped pattern with some info to make it
@@ -4378,7 +4378,8 @@ void CodeGenDAGPatterns::ParsePatterns() {
       FindPatternInputsAndOutputs(Pattern, Pattern.getTree(j), InstInputs,
                                   InstResults, InstImpResults);
 
-    ParseOnePattern(CurPattern, Pattern, Result, InstImpResults);
+    ParseOnePattern(CurPattern, Pattern, Result, InstImpResults,
+                    CurPattern->getValueAsBit("GISelShouldIgnore"));
   }
 }
 
@@ -4407,10 +4408,10 @@ void CodeGenDAGPatterns::ExpandHwModeBasedTypes() {
       return;
     }
 
-    PatternsToMatch.emplace_back(P.getSrcRecord(), P.getPredicates(),
-                                 std::move(NewSrc), std::move(NewDst),
-                                 P.getDstRegs(), P.getAddedComplexity(),
-                                 Record::getNewUID(Records), Check);
+    PatternsToMatch.emplace_back(
+        P.getSrcRecord(), P.getPredicates(), std::move(NewSrc),
+        std::move(NewDst), P.getDstRegs(), P.getAddedComplexity(),
+        Record::getNewUID(Records), P.getGISelShouldIgnore(), Check);
   };
 
   for (PatternToMatch &P : Copy) {
@@ -4781,6 +4782,7 @@ void CodeGenDAGPatterns::GenerateVariants() {
           Variant, PatternsToMatch[i].getDstPatternShared(),
           PatternsToMatch[i].getDstRegs(),
           PatternsToMatch[i].getAddedComplexity(), Record::getNewUID(Records),
+          PatternsToMatch[i].getGISelShouldIgnore(),
           PatternsToMatch[i].getHwModeFeatures());
     }