Instruction counters must skip the bitcasts that
feed into llvm.dbg.declare nodes, as well as
the debug directives themselves.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65976 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index 64dd103..8f094b7 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -11484,7 +11484,11 @@
for (unsigned ScanInsts = 6; BBI != SI.getParent()->begin() && ScanInsts;
--ScanInsts) {
// Don't count debug info directives, lest they affect codegen.
- if (isa<DbgInfoIntrinsic>(BBI)) {
+ // Likewise, we skip bitcasts that feed into a llvm.dbg.declare; these are
+ // not present when debugging is off.
+ if (isa<DbgInfoIntrinsic>(BBI) ||
+ (isa<BitCastInst>(BBI) && BBI->hasOneUse() &&
+ isa<DbgDeclareInst>(BBI->use_begin()))) {
ScanInsts++;
--BBI;
continue;