[llvm] a583654 - GlobalISel: Add debug print for applied rule in generated combiner

[Matt Arsenault via llvm-commits]

Author: Matt Arsenault
Date: 2022-11-14T15:59:05-08:00
New Revision: a583654a8b1767190e08f2ec568841c6aaad4e3c

URL: https://github.com/llvm/llvm-project/commit/a583654a8b1767190e08f2ec568841c6aaad4e3c
DIFF: https://github.com/llvm/llvm-project/commit/a583654a8b1767190e08f2ec568841c6aaad4e3c.diff

LOG: GlobalISel: Add debug print for applied rule in generated combiner

Added: 
    

Modified: 
    llvm/test/TableGen/GICombinerEmitter/match-tree.td
    llvm/utils/TableGen/GICombinerEmitter.cpp

Removed: 
    


################################################################################
diff  --git a/llvm/test/TableGen/GICombinerEmitter/match-tree.td b/llvm/test/TableGen/GICombinerEmitter/match-tree.td
index e1f0f423e70c1..6ca1e4b3c0cc1 100644
--- a/llvm/test/TableGen/GICombinerEmitter/match-tree.td
+++ b/llvm/test/TableGen/GICombinerEmitter/match-tree.td
@@ -239,6 +239,7 @@ def MyCombinerHelper: GICombinerHelper<"GenMyCombinerHelper", [
 // CODE-NEXT:        if (!RuleConfig->isRuleDisabled(0)) {
 // CODE-NEXT:          if (1
 // CODE-NEXT:) {
+// CODE-NEXT:            LLVM_DEBUG(dbgs() << "Applying rule 'Rule0'\n");
 // CODE-NEXT:            APPLY
 // CODE-NEXT:            return true;
 // CODE-NEXT:          }
@@ -259,6 +260,7 @@ def MyCombinerHelper: GICombinerHelper<"GenMyCombinerHelper", [
 // CODE-NEXT:               Subtarget->hasFoo()
 // CODE-NEXT:               )
 // CODE-NEXT:) {
+// CODE-NEXT:            LLVM_DEBUG(dbgs() << "Applying rule 'Rule5'\n");
 // CODE-NEXT:            APPLY
 // CODE-NEXT:            return true;
 // CODE-NEXT:          }
@@ -280,6 +282,7 @@ def MyCombinerHelper: GICombinerHelper<"GenMyCombinerHelper", [
 // CODE-NEXT:             Subtarget->hasFoo()
 // CODE-NEXT:             )
 // CODE-NEXT:      ) {
+// CODE-NEXT:          LLVM_DEBUG(dbgs() << "Applying rule 'Rule5'\n");
 // CODE-NEXT:          APPLY
 // CODE-NEXT:          return true;
 // CODE-NEXT:        }
@@ -305,6 +308,7 @@ def MyCombinerHelper: GICombinerHelper<"GenMyCombinerHelper", [
 // CODE-NEXT:            Subtarget->getAnswerToUniverse() == 42 && Subtarget->getAnswerToLife() == 42
 // CODE-NEXT:          )
 // CODE-NEXT:      ) {
+// CODE-NEXT:     LLVM_DEBUG(dbgs() << "Applying rule 'Rule6'\n");
 // CODE-NEXT:     APPLY
 // CODE-NEXT:     return true;
 // CODE-NEXT:   }

diff  --git a/llvm/utils/TableGen/GICombinerEmitter.cpp b/llvm/utils/TableGen/GICombinerEmitter.cpp
index 266186bf94527..14f24654c7ad4 100644
--- a/llvm/utils/TableGen/GICombinerEmitter.cpp
+++ b/llvm/utils/TableGen/GICombinerEmitter.cpp
@@ -823,16 +823,19 @@ void GICombinerEmitter::generateCodeForTree(raw_ostream &OS,
          << Indent << "      "
          << CodeExpander(Rule->getMatchingFixupCode()->getValue(), Expansions,
                          RuleDef.getLoc(), ShowExpansions)
-         << "\n"
+         << '\n'
          << Indent << "      return true;\n"
          << Indent << "  }()";
     }
     OS << Indent << "     ) {\n" << Indent << "   ";
 
     if (const StringInit *Code = dyn_cast<StringInit>(Applyer->getArg(0))) {
-      OS << CodeExpander(Code->getAsUnquotedString(), Expansions,
+      OS << "    LLVM_DEBUG(dbgs() << \"Applying rule '"
+         << RuleDef.getName()
+         << "'\\n\");\n"
+         << CodeExpander(Code->getAsUnquotedString(), Expansions,
                          RuleDef.getLoc(), ShowExpansions)
-         << "\n"
+         << '\n'
          << Indent << "    return true;\n"
          << Indent << "  }\n";
     } else {