[GlobalISel] Reporting rules covered as part of the InstructionSelect's debug-only printing

The main goal of this change is to make it much easier to track which
rules are actually covered by Testgen'erated regression tests.

Reviewers: aemerson, dsanders

Differential Revision: https://reviews.llvm.org/D46095

llvm-svn: 330988

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/GlobalISel/InstructionSelect.cpp b/llvm/lib/CodeGen/GlobalISel/InstructionSelect.cpp
index 557cc73dcda..7923a888118 100644
--- a/llvm/lib/CodeGen/GlobalISel/InstructionSelect.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/InstructionSelect.cpp
@@ -218,6 +218,12 @@ bool InstructionSelect::runOnMachineFunction(MachineFunction &MF) {
   auto &TLI = *MF.getSubtarget().getTargetLowering();
   TLI.finalizeLowering(MF);
 
+  DEBUG({
+    dbgs() << "Rules covered by selecting function: " << MF.getName() << ":";
+    for (auto RuleID : CoverageInfo.covered())
+      dbgs() << " id" << RuleID;
+    dbgs() << "\n\n";
+  });
   CoverageInfo.emit(CoveragePrefix,
                     MF.getSubtarget()
                         .getTargetLowering()