[llvm-commits] [llvm] r168711 - in /llvm/trunk: lib/Analysis/ScalarEvolution.cpp test/Transforms/IndVarSimplify/eliminate-comparison.ll

Benjamin Kramer benny.kra at googlemail.com
Tue Nov 27 10:16:32 PST 2012


Author: d0k
Date: Tue Nov 27 12:16:32 2012
New Revision: 168711

URL: http://llvm.org/viewvc/llvm-project?rev=168711&view=rev
Log:
SCEV: Even if the latch terminator is foldable we can't deduce the result of an unrelated condition with it.

Fixes PR14432.

Modified:
    llvm/trunk/lib/Analysis/ScalarEvolution.cpp
    llvm/trunk/test/Transforms/IndVarSimplify/eliminate-comparison.ll

Modified: llvm/trunk/lib/Analysis/ScalarEvolution.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/ScalarEvolution.cpp?rev=168711&r1=168710&r2=168711&view=diff
==============================================================================
--- llvm/trunk/lib/Analysis/ScalarEvolution.cpp (original)
+++ llvm/trunk/lib/Analysis/ScalarEvolution.cpp Tue Nov 27 12:16:32 2012
@@ -6149,9 +6149,10 @@
   if (SimplifyICmpOperands(Pred, LHS, RHS))
     if (LHS == RHS)
       return CmpInst::isTrueWhenEqual(Pred);
-  if (SimplifyICmpOperands(FoundPred, FoundLHS, FoundRHS))
-    if (FoundLHS == FoundRHS)
-      return CmpInst::isFalseWhenEqual(Pred);
+
+  // Canonicalize the found cond too.  We can't conclude a result from the
+  // simplified values.
+  SimplifyICmpOperands(FoundPred, FoundLHS, FoundRHS);
 
   // Check to see if we can make the LHS or RHS match.
   if (LHS == FoundRHS || RHS == FoundLHS) {

Modified: llvm/trunk/test/Transforms/IndVarSimplify/eliminate-comparison.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/IndVarSimplify/eliminate-comparison.ll?rev=168711&r1=168710&r2=168711&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/IndVarSimplify/eliminate-comparison.ll (original)
+++ llvm/trunk/test/Transforms/IndVarSimplify/eliminate-comparison.ll Tue Nov 27 12:16:32 2012
@@ -106,3 +106,57 @@
 return:
   ret void
 }
+
+; PR14432
+; Indvars should not turn the second loop into an infinite one.
+
+; CHECK: @func_11
+; CHECK: %tmp5 = icmp slt i32 %__key6.0, 10
+; CHECK-NOT: br i1 true, label %noassert68, label %unrolledend
+
+define i32 @func_11() nounwind uwtable {
+entry:
+  br label %forcond
+
+forcond:                                          ; preds = %noassert, %entry
+  %__key6.0 = phi i32 [ 2, %entry ], [ %tmp37, %noassert ]
+  %tmp5 = icmp slt i32 %__key6.0, 10
+  br i1 %tmp5, label %noassert, label %forcond38.preheader
+
+forcond38.preheader:                              ; preds = %forcond
+  br label %forcond38
+
+noassert:                                         ; preds = %forbody
+  %tmp13 = sdiv i32 -32768, %__key6.0
+  %tmp2936 = shl i32 %tmp13, 24
+  %sext23 = shl i32 %tmp13, 24
+  %tmp32 = icmp eq i32 %tmp2936, %sext23
+  %tmp37 = add i32 %__key6.0, 1
+  br i1 %tmp32, label %forcond, label %assert33
+
+assert33:                                         ; preds = %noassert
+  tail call void @llvm.trap()
+  unreachable
+
+forcond38:                                        ; preds = %noassert68, %forcond38.preheader
+  %__key8.0 = phi i32 [ %tmp81, %noassert68 ], [ 2, %forcond38.preheader ]
+  %tmp46 = icmp slt i32 %__key8.0, 10
+  br i1 %tmp46, label %noassert68, label %unrolledend
+
+noassert68:                                       ; preds = %forbody39
+  %tmp57 = sdiv i32 -32768, %__key8.0
+  %sext34 = shl i32 %tmp57, 16
+  %sext21 = shl i32 %tmp57, 16
+  %tmp76 = icmp eq i32 %sext34, %sext21
+  %tmp81 = add i32 %__key8.0, 1
+  br i1 %tmp76, label %forcond38, label %assert77
+
+assert77:                                         ; preds = %noassert68
+  tail call void @llvm.trap()
+  unreachable
+
+unrolledend:                                      ; preds = %forcond38
+  ret i32 0
+}
+
+declare void @llvm.trap() noreturn nounwind





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