[DebugInfo] Examine all uses of isDebugValue() for debug instructions.

Because we create a new kind of debug instruction, DBG_LABEL, we need to
check all passes which use isDebugValue() to check MachineInstr is debug
instruction or not. When expelling debug instructions, we should expel
both DBG_VALUE and DBG_LABEL. So, I create a new function,
isDebugInstr(), in MachineInstr to check whether the MachineInstr is
debug instruction or not.

This patch has no new test case. I have run regression test and there is
no difference in regression test.

Differential Revision: https://reviews.llvm.org/D45342

Patch by Hsiangkai Wang.

llvm-svn: 331844

1 files changed, 6 insertions, 3 deletions

diff --git a/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp b/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp
index 45df5c9d0b5..d08501fa3c4 100644
--- a/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp
+++ b/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp
@@ -533,7 +533,7 @@ void ScheduleDAGInstrs::initSUnits() {
   SUnits.reserve(NumRegionInstrs);
 
   for (MachineInstr &MI : make_range(RegionBegin, RegionEnd)) {
-    if (MI.isDebugValue())
+    if (MI.isDebugInstr())
       continue;
 
     SUnit *SU = newSUnit(&MI);
@@ -764,6 +764,9 @@ void ScheduleDAGInstrs::buildSchedGraph(AliasAnalysis *AA,
       DbgMI = &MI;
       continue;
     }
+    if (MI.isDebugLabel())
+      continue;
+
     SUnit *SU = MISUnitMap[&MI];
     assert(SU && "No SUnit mapped to this MI");
 
@@ -1052,7 +1055,7 @@ void ScheduleDAGInstrs::fixupKills(MachineBasicBlock &MBB) {
 
   // Examine block from end to start...
   for (MachineInstr &MI : make_range(MBB.rbegin(), MBB.rend())) {
-    if (MI.isDebugValue())
+    if (MI.isDebugInstr())
       continue;
 
     // Update liveness.  Registers that are defed but not used in this
@@ -1088,7 +1091,7 @@ void ScheduleDAGInstrs::fixupKills(MachineBasicBlock &MBB) {
       while (I->isBundledWithSucc())
         ++I;
       do {
-        if (!I->isDebugValue())
+        if (!I->isDebugInstr())
           toggleKills(MRI, LiveRegs, *I, true);
         --I;
       } while(I != First);