[llvm] r210435 - ScalarEvolution: Derive element size from the type of the loaded element

[Tobias Grosser]

Author: grosser
Date: Sun Jun  8 14:21:20 2014
New Revision: 210435

URL: http://llvm.org/viewvc/llvm-project?rev=210435&view=rev
Log:
ScalarEvolution: Derive element size from the type of the loaded element

Before, we where looking at the size of the pointer type that specifies the
location from which to load the element. This did not make any sense at all.

This change fixes a bug in the delinearization where we failed to delinerize
certain load instructions.

Modified:
    llvm/trunk/lib/Analysis/ScalarEvolution.cpp
    llvm/trunk/test/Analysis/Delinearization/multidim_only_ivs_2d.ll

Modified: llvm/trunk/lib/Analysis/ScalarEvolution.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/ScalarEvolution.cpp?rev=210435&r1=210434&r2=210435&view=diff
==============================================================================
--- llvm/trunk/lib/Analysis/ScalarEvolution.cpp (original)
+++ llvm/trunk/lib/Analysis/ScalarEvolution.cpp Sun Jun  8 14:21:20 2014
@@ -7365,7 +7365,7 @@ const SCEV *ScalarEvolution::getElementS
   if (StoreInst *Store = dyn_cast<StoreInst>(Inst))
     Ty = Store->getValueOperand()->getType();
   else if (LoadInst *Load = dyn_cast<LoadInst>(Inst))
-    Ty = Load->getPointerOperand()->getType();
+    Ty = Load->getType();
   else
     return nullptr;
 

Modified: llvm/trunk/test/Analysis/Delinearization/multidim_only_ivs_2d.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Analysis/Delinearization/multidim_only_ivs_2d.ll?rev=210435&r1=210434&r2=210435&view=diff
==============================================================================
--- llvm/trunk/test/Analysis/Delinearization/multidim_only_ivs_2d.ll (original)
+++ llvm/trunk/test/Analysis/Delinearization/multidim_only_ivs_2d.ll Sun Jun  8 14:21:20 2014
@@ -8,6 +8,15 @@
 ;       A[i][j] = 1.0;
 ; }
 
+; Inst:  %val = load double* %arrayidx
+; In Loop with Header: for.j
+; AddRec: {{0,+,(%m * sizeof(double))}<%for.i>,+,sizeof(double)}<%for.j>
+; Base offset: %A
+; ArrayDecl[UnknownSize][%m] with elements of sizeof(double) bytes.
+; ArrayRef[{0,+,1}<nuw><nsw><%for.i>][{0,+,1}<nuw><nsw><%for.j>]
+
+; Inst:  store double %val, double* %arrayidx
+; In Loop with Header: for.j
 ; AddRec: {{%A,+,(8 * %m)}<%for.i>,+,8}<%for.j>
 ; CHECK: Base offset: %A
 ; CHECK: ArrayDecl[UnknownSize][%m] with elements of sizeof(double) bytes.
@@ -26,7 +35,8 @@ for.j:
   %j = phi i64 [ 0, %for.i ], [ %j.inc, %for.j ]
   %vlaarrayidx.sum = add i64 %j, %tmp
   %arrayidx = getelementptr inbounds double* %A, i64 %vlaarrayidx.sum
-  store double 1.0, double* %arrayidx
+  %val = load double* %arrayidx
+  store double %val, double* %arrayidx
   %j.inc = add nsw i64 %j, 1
   %j.exitcond = icmp eq i64 %j.inc, %m
   br i1 %j.exitcond, label %for.i.inc, label %for.j