[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, 1 deletions

diff --git a/llvm/lib/Support/CodeGenCoverage.cpp b/llvm/lib/Support/CodeGenCoverage.cpp
index ebfe65a398c..4948f1348fc 100644
--- a/llvm/lib/Support/CodeGenCoverage.cpp
+++ b/llvm/lib/Support/CodeGenCoverage.cpp
@@ -38,12 +38,17 @@ void CodeGenCoverage::setCovered(uint64_t RuleID) {
   RuleCoverage[RuleID] = true;
 }
 
-bool CodeGenCoverage::isCovered(uint64_t RuleID) {
+bool CodeGenCoverage::isCovered(uint64_t RuleID) const {
   if (RuleCoverage.size() <= RuleID)
     return false;
   return RuleCoverage[RuleID];
 }
 
+iterator_range<CodeGenCoverage::const_covered_iterator>
+CodeGenCoverage::covered() const {
+  return RuleCoverage.set_bits();
+}
+
 bool CodeGenCoverage::parse(MemoryBuffer &Buffer, StringRef BackendName) {
   const char *CurPtr = Buffer.getBufferStart();