[llvm-commits] [llvm] r149654 - in /llvm/trunk: include/llvm/Transforms/Utils/SSAUpdaterImpl.h test/Transforms/ScalarRepl/phi-cycle.ll

Dan Gohman gohman at apple.com
Thu Feb 2 17:07:01 PST 2012


Author: djg
Date: Thu Feb  2 19:07:01 2012
New Revision: 149654

URL: http://llvm.org/viewvc/llvm-project?rev=149654&view=rev
Log:
Fix SSAUpdaterImpl's RecordMatchingPHI to record exactly the
PHI nodes which were matched, rather than climbing up the
original PHI node's operands to rediscover PHI nodes for
recording, since the PHI nodes found that are not
necessarily part of the matched set.
This fixes rdar://10589171.

Added:
    llvm/trunk/test/Transforms/ScalarRepl/phi-cycle.ll
Modified:
    llvm/trunk/include/llvm/Transforms/Utils/SSAUpdaterImpl.h

Modified: llvm/trunk/include/llvm/Transforms/Utils/SSAUpdaterImpl.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Transforms/Utils/SSAUpdaterImpl.h?rev=149654&r1=149653&r2=149654&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Transforms/Utils/SSAUpdaterImpl.h (original)
+++ llvm/trunk/include/llvm/Transforms/Utils/SSAUpdaterImpl.h Thu Feb  2 19:07:01 2012
@@ -380,7 +380,7 @@
       if (!SomePHI)
         break;
       if (CheckIfPHIMatches(SomePHI)) {
-        RecordMatchingPHI(SomePHI);
+        RecordMatchingPHIs(BlockList);
         break;
       }
       // Match failed: clear all the PHITag values.
@@ -437,38 +437,17 @@
     return true;
   }
 
-  /// RecordMatchingPHI - For a PHI node that matches, record it and its input
-  /// PHIs in both the BBMap and the AvailableVals mapping.
-  void RecordMatchingPHI(PhiT *PHI) {
-    SmallVector<PhiT*, 20> WorkList;
-    WorkList.push_back(PHI);
-
-    // Record this PHI.
-    BlkT *BB = PHI->getParent();
-    ValT PHIVal = Traits::GetPHIValue(PHI);
-    (*AvailableVals)[BB] = PHIVal;
-    BBMap[BB]->AvailableVal = PHIVal;
-
-    while (!WorkList.empty()) {
-      PHI = WorkList.pop_back_val();
-
-      // Iterate through the PHI's incoming values.
-      for (typename Traits::PHI_iterator I = Traits::PHI_begin(PHI),
-             E = Traits::PHI_end(PHI); I != E; ++I) {
-        ValT IncomingVal = I.getIncomingValue();
-        PhiT *IncomingPHI = Traits::ValueIsPHI(IncomingVal, Updater);
-        if (!IncomingPHI) continue;
-        BB = IncomingPHI->getParent();
-        BBInfo *Info = BBMap[BB];
-        if (!Info || Info->AvailableVal)
-          continue;
-
-        // Record the PHI and add it to the worklist.
-        (*AvailableVals)[BB] = IncomingVal;
-        Info->AvailableVal = IncomingVal;
-        WorkList.push_back(IncomingPHI);
+  /// RecordMatchingPHIs - For each PHI node that matches, record it in both
+  /// the BBMap and the AvailableVals mapping.
+  void RecordMatchingPHIs(BlockListTy *BlockList) {
+    for (typename BlockListTy::iterator I = BlockList->begin(),
+           E = BlockList->end(); I != E; ++I)
+      if (PhiT *PHI = (*I)->PHITag) {
+        BlkT *BB = PHI->getParent();
+        ValT PHIVal = Traits::GetPHIValue(PHI);
+        (*AvailableVals)[BB] = PHIVal;
+        BBMap[BB]->AvailableVal = PHIVal;
       }
-    }
   }
 };
 

Added: llvm/trunk/test/Transforms/ScalarRepl/phi-cycle.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/ScalarRepl/phi-cycle.ll?rev=149654&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/ScalarRepl/phi-cycle.ll (added)
+++ llvm/trunk/test/Transforms/ScalarRepl/phi-cycle.ll Thu Feb  2 19:07:01 2012
@@ -0,0 +1,77 @@
+; RUN: opt -S -scalarrepl-ssa < %s | FileCheck %s
+; rdar://10589171
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+%struct.foo = type { i32, i32 }
+
+ at .str = private unnamed_addr constant [6 x i8] c"x=%d\0A\00", align 1
+
+define i32 @main(i32 %argc, i8** nocapture %argv) nounwind uwtable {
+entry:
+  %f = alloca %struct.foo, align 4
+  %x.i = getelementptr inbounds %struct.foo* %f, i64 0, i32 0
+  store i32 1, i32* %x.i, align 4
+  %y.i = getelementptr inbounds %struct.foo* %f, i64 0, i32 1
+  br label %while.cond.i
+
+; CHECK: while.cond.i:
+; CHECK-NEXT: %tmp = phi i32 [ 1, %entry ], [ %tmp2, %while.cond.backedge.i ]
+; CHECK-NEXT: %pos.0.i = phi i32 [ 1, %entry ], [ %xtmp.i, %while.cond.backedge.i ]
+; CHECK-NEXT: %left.0.i = phi i32 [ 1, %entry ], [ %dec.i, %while.cond.backedge.i ]
+; CHECK-NOT: phi
+while.cond.i:                                     ; preds = %while.cond.backedge.i, %entry
+  %tmp = phi i32 [ 1, %entry ], [ %tmp2, %while.cond.backedge.i ]
+  %pos.0.i = phi i32 [ 1, %entry ], [ %xtmp.i, %while.cond.backedge.i ]
+  %left.0.i = phi i32 [ 1, %entry ], [ %dec.i, %while.cond.backedge.i ]
+  %cmp.i = icmp sgt i32 %left.0.i, 0
+  br i1 %cmp.i, label %while.body.i, label %while.cond.i.func.exit_crit_edge
+
+while.cond.i.func.exit_crit_edge:                 ; preds = %while.cond.i
+  br label %func.exit
+
+while.body.i:                                     ; preds = %while.cond.i
+  %dec.i = add nsw i32 %left.0.i, -1
+  switch i32 1, label %while.body.i.func.exit_crit_edge [
+    i32 0, label %while.cond.backedge.i
+    i32 1, label %sw.bb.i
+  ]
+
+while.body.i.func.exit_crit_edge:                 ; preds = %while.body.i
+  br label %func.exit
+
+sw.bb.i:                                          ; preds = %while.body.i
+  %cmp2.i = icmp eq i32 %tmp, 1
+  br i1 %cmp2.i, label %if.then.i, label %if.end.i
+
+if.then.i:                                        ; preds = %sw.bb.i
+  store i32 %pos.0.i, i32* %x.i, align 4
+  br label %if.end.i
+
+; CHECK: if.end.i:
+; CHECK-NEXT: %tmp1 = phi i32 [ %pos.0.i, %if.then.i ], [ %tmp, %sw.bb.i ]
+; CHECK-NOT: phi
+if.end.i:                                         ; preds = %if.then.i, %sw.bb.i
+  %tmp1 = phi i32 [ %pos.0.i, %if.then.i ], [ %tmp, %sw.bb.i ]
+  store i32 %tmp1, i32* %y.i, align 4
+  br label %while.cond.backedge.i
+
+; CHECK: while.cond.backedge.i:
+; CHECK-NEXT: %tmp2 = phi i32 [ %tmp1, %if.end.i ], [ %tmp, %while.body.i ]
+; CHECK-NOT: phi
+while.cond.backedge.i:                            ; preds = %if.end.i, %while.body.i
+  %tmp2 = phi i32 [ %tmp1, %if.end.i ], [ %tmp, %while.body.i ]
+  %xtmp.i = add i32 %pos.0.i, 1
+  br label %while.cond.i
+
+; CHECK: func.exit:
+; CHECK-NOT: load
+; CHECK: %call = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([6 x i8]* @.str, i64 0, i64 0), i32 %tmp) nounwind
+func.exit:                                        ; preds = %while.body.i.func.exit_crit_edge, %while.cond.i.func.exit_crit_edge
+  %tmp3 = load i32* %x.i, align 4
+  %call = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([6 x i8]* @.str, i64 0, i64 0), i32 %tmp3) nounwind
+  ret i32 0
+}
+
+declare i32 @printf(i8* nocapture, ...) nounwind





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