Generalize PostRAHazardRecognizer so it can be used in any pass for

both forward and backward scheduling. Rename it to
ScoreboardHazardRecognizer (Scoreboard is one word). Remove integer
division from the scoreboard's critical path.

llvm-svn: 121274

1 files changed, 8 insertions, 4 deletions

diff --git a/llvm/lib/Target/ARM/ARMHazardRecognizer.cpp b/llvm/lib/Target/ARM/ARMHazardRecognizer.cpp
index 317934faec5..b8d385b6e3d 100644
--- a/llvm/lib/Target/ARM/ARMHazardRecognizer.cpp
+++ b/llvm/lib/Target/ARM/ARMHazardRecognizer.cpp
@@ -68,14 +68,14 @@ ARMHazardRecognizer::getHazardType(SUnit *SU) {
     }
   }
 
-  return PostRAHazardRecognizer::getHazardType(SU);
+  return ScoreboardHazardRecognizer::getHazardType(SU);
 }
 
 void ARMHazardRecognizer::Reset() {
   LastMI = 0;
   Stalls = 0;
   ITBlockSize = 0;
-  PostRAHazardRecognizer::Reset();
+  ScoreboardHazardRecognizer::Reset();
 }
 
 void ARMHazardRecognizer::EmitInstruction(SUnit *SU) {
@@ -103,12 +103,16 @@ void ARMHazardRecognizer::EmitInstruction(SUnit *SU) {
     Stalls = 0;
   }
 
-  PostRAHazardRecognizer::EmitInstruction(SU);
+  ScoreboardHazardRecognizer::EmitInstruction(SU);
 }
 
 void ARMHazardRecognizer::AdvanceCycle() {
   if (Stalls && --Stalls == 0)
     // Stalled for 4 cycles but still can't schedule any other instructions.
     LastMI = 0;
-  PostRAHazardRecognizer::AdvanceCycle();
+  ScoreboardHazardRecognizer::AdvanceCycle();
+}
+
+void ARMHazardRecognizer::RecedeCycle() {
+  llvm_unreachable("reverse ARM hazard checking unsupported");
 }