[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, 3 insertions, 3 deletions

diff --git a/llvm/lib/CodeGen/MachineBasicBlock.cpp b/llvm/lib/CodeGen/MachineBasicBlock.cpp
index cf22230..d792ad4 100644
--- a/llvm/lib/CodeGen/MachineBasicBlock.cpp
+++ b/llvm/lib/CodeGen/MachineBasicBlock.cpp
@@ -1515,7 +1515,7 @@ MachineBasicBlock::computeRegisterLiveness(const TargetRegisterInfo *TRI,
   // Try searching forwards from Before, looking for reads or defs.
   const_iterator I(Before);
   for (; I != end() && N > 0; ++I) {
-    if (I->isDebugInstr())
+    if (I->isDebugOrPseudoInstr())
       continue;
 
     --N;
@@ -1553,7 +1553,7 @@ MachineBasicBlock::computeRegisterLiveness(const TargetRegisterInfo *TRI,
     do {
       --I;
 
-      if (I->isDebugInstr())
+      if (I->isDebugOrPseudoInstr())
         continue;
 
       --N;
@@ -1587,7 +1587,7 @@ MachineBasicBlock::computeRegisterLiveness(const TargetRegisterInfo *TRI,
 
   // If all the instructions before this in the block are debug instructions,
   // skip over them.
-  while (I != begin() && std::prev(I)->isDebugInstr())
+  while (I != begin() && std::prev(I)->isDebugOrPseudoInstr())
     --I;
 
   // Did we get to the start of the block?