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Fix an error where ANTIC_OUT was ending up with more than one expression of

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the same value number.  This fixes an infinite loop on 444.namd.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37967 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2007-07-07 20:13:57 +00:00
parent 8f5149e002
commit 36a07daabd
2 changed files with 15 additions and 1 deletions
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2
lib/Transforms/Scalar/GVNPRE.cpp
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@ -1370,7 +1370,7 @@ unsigned GVNPRE::buildsets_anticin(BasicBlock* BB,
unsigned num = VN.lookup_or_add(*I);
numbers.resize(VN.size());
if (isa<Instruction>(*I)) {
if (isa<Instruction>(*I) && !numbers.test(num)) {
anticIn.insert(*I);
numbers.set(num);
}

14
test/Transforms/GVNPRE/2007-07-07-AnticOutUnique.ll Normal file
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@ -0,0 +1,14 @@
; RUN: llvm-as < %s | opt -gvnpre | llvm-dis
%"struct.ObjectArena<char>" = type { i32, i32, %"struct.ResizeArray<char*>", i8*, i8* }
%"struct.ResizeArray<char*>" = type { i32 (...)**, %"struct.ResizeArrayRaw<char*>"* }
%"struct.ResizeArrayRaw<char*>" = type { i8**, i8*, i32, i32, i32, float, i32 }
define void @_ZN11ObjectArenaIcED1Ev(%"struct.ObjectArena<char>"* %this) {
entry:
br label %cond_true21
cond_true21: ; preds = %cond_true21, %entry
%tmp215.0 = phi %"struct.ResizeArray<char*>"* [ null, %entry ], [ null, %cond_true21 ] ; <%"struct.ResizeArray<char*>"*> [#uses=1]
%tmp2.i2 = getelementptr %"struct.ResizeArray<char*>"* %tmp215.0, i32 0, i32 1 ; <%"struct.ResizeArrayRaw<char*>"**> [#uses=0]
br label %cond_true21
}