GBE: No need to compute liveout again in value.cpp.

We already did a complete liveness analysis at the liveness.cpp.
Don't need to do that again. Save about 10% of the compile time.

Signed-off-by: Zhigang Gong <zhigang.gong@intel.com>
Reviewed-by: Ruiling Song <ruiling.song@intel.com>

1 files changed, 0 insertions, 33 deletions

diff --git a/backend/src/ir/value.cpp b/backend/src/ir/value.cpp
index 1dbd4f4d..cdc1a4c6 100644
--- a/backend/src/ir/value.cpp
+++ b/backend/src/ir/value.cpp
@@ -66,8 +66,6 @@ namespace ir {
      *  registers
      */
     void initializeOtherDef(void);
-    /*! Iterate to completely transfer the liveness and get the def sets */
-    void iterateLiveOut(void);
     /*! Use custom allocators */
     GBE_CLASS(LiveOutSet);
   };
@@ -80,7 +78,6 @@ namespace ir {
   {
     this->initializeInstructionDef();
     this->initializeOtherDef();
-    this->iterateLiveOut();
   }
 
   LiveOutSet::RegDefSet &LiveOutSet::getDefSet(const BasicBlock *bb, Register reg)
@@ -227,36 +224,6 @@ namespace ir {
     }
   }
 
-  void LiveOutSet::iterateLiveOut(void) {
-    bool changed = true;
-
-    while (changed) {
-      changed = false;
-
-      // Compute the union of the current liveout definitions with the previous
-      // ones. Do not take into account the killed values though
-      liveness.foreach<DF_PRED>([&](Liveness::BlockInfo &curr,
-                                    const Liveness::BlockInfo &pred)
-      {
-        const BasicBlock &bb = curr.bb;
-        const BasicBlock &pbb = pred.bb;
-        for (auto reg : curr.liveOut) {
-          if (pred.inLiveOut(reg) == false) continue;
-          if (curr.inVarKill(reg) == true) continue;
-          RegDefSet &currSet = this->getDefSet(&bb, reg);
-          RegDefSet &predSet = this->getDefSet(&pbb, reg);
-
-          // Transfer the values
-          for (auto def : predSet) {
-            if (currSet.contains(def)) continue;
-            changed = true;
-            currSet.insert(def);
-          }
-        }
-      });
-    }
-  }
-
   LiveOutSet::~LiveOutSet(void) {
     for (const auto pair : defMap) {
       BlockDefMap *block = pair.second;