[CSSPGO] Exclude pseudo probes from slot index

Pseudo probe are currently given a slot index like other regular instructions. This affects register pressure and lifetime weight computation because of enlarged lifetime length with pseudo probe instructions. As a consequence, program could get different code generated w/ and w/o pseudo probes. I'm closing the gap by excluding pseudo probes from stack index and downstream register allocation related passes.

Reviewed By: wmi

Differential Revision: https://reviews.llvm.org/D100334

1 files changed, 2 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/LiveDebugVariables.cpp b/llvm/lib/CodeGen/LiveDebugVariables.cpp
index 751e4f6..ce898cd 100644
--- a/llvm/lib/CodeGen/LiveDebugVariables.cpp
+++ b/llvm/lib/CodeGen/LiveDebugVariables.cpp
@@ -870,7 +870,7 @@ bool LDVImpl::collectDebugValues(MachineFunction &mf) {
          MBBI != MBBE;) {
       // Use the first debug instruction in the sequence to get a SlotIndex
       // for following consecutive debug instructions.
-      if (!MBBI->isDebugInstr()) {
+      if (!MBBI->isDebugOrPseudoInstr()) {
         ++MBBI;
         continue;
       }
@@ -891,7 +891,7 @@ bool LDVImpl::collectDebugValues(MachineFunction &mf) {
           Changed = true;
         } else
           ++MBBI;
-      } while (MBBI != MBBE && MBBI->isDebugInstr());
+      } while (MBBI != MBBE && MBBI->isDebugOrPseudoInstr());
     }
   }
   return Changed;