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Fix crash when when do lto on Bullet. Dynamic GEPs in SROA were incorrectly being applied to all accesses to an alloca, not just the ones which read from the GEP. Thanks to Evan for reducing the test. rdar://11861001

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161654 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Pete Cooper 2012-08-10 03:26:36 +00:00
parent 15121ca0d1
commit 3eeba88631
2 changed files with 30 additions and 3 deletions
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11
lib/Transforms/Scalar/ScalarReplAggregates.cpp
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@ -612,11 +612,16 @@ void ConvertToScalarInfo::ConvertUsesToScalar(Value *Ptr, AllocaInst *NewAI,
if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(User)) {
// Compute the offset that this GEP adds to the pointer.
SmallVector<Value*, 8> Indices(GEP->op_begin()+1, GEP->op_end());
if (!GEP->hasAllConstantIndices())
NonConstantIdx = Indices.pop_back_val();
Value* GEPNonConstantIdx = 0;
if (!GEP->hasAllConstantIndices()) {
assert(!NonConstantIdx &&
"Dynamic GEP reading from dynamic GEP unsupported");
GEPNonConstantIdx = Indices.pop_back_val();
} else
GEPNonConstantIdx = NonConstantIdx;
uint64_t GEPOffset = TD.getIndexedOffset(GEP->getPointerOperandType(),
Indices);
ConvertUsesToScalar(GEP, NewAI, Offset+GEPOffset*8, NonConstantIdx);
ConvertUsesToScalar(GEP, NewAI, Offset+GEPOffset*8, GEPNonConstantIdx);
GEP->eraseFromParent();
continue;
}

22
test/Transforms/ScalarRepl/crash.ll
View File

@ -260,5 +260,27 @@ entry:
ret void
}
; rdar://11861001 - The dynamic GEP here was incorrectly making all accesses
; to the alloca think they were also dynamic. Inserts and extracts created to
; access the vector were all being based from the dynamic access, even in BBs
; not dominated by the GEP.
define fastcc void @test() optsize inlinehint ssp align 2 {
entry:
%alloc.0.0 = alloca <4 x float>, align 16
%bitcast = bitcast <4 x float>* %alloc.0.0 to [4 x float]*
%idx3 = getelementptr inbounds [4 x float]* %bitcast, i32 0, i32 3
store float 0.000000e+00, float* %idx3, align 4
br label %for.body10
for.body10: ; preds = %for.body10, %entry
%loopidx = phi i32 [ 0, %entry ], [ undef, %for.body10 ]
%unusedidx = getelementptr inbounds <4 x float>* %alloc.0.0, i32 0, i32 %loopidx
br i1 undef, label %for.end, label %for.body10
for.end: ; preds = %for.body10
store <4 x float> <float -1.000000e+00, float -1.000000e+00, float -1.000000e+00, float 0.000000e+00>, <4 x float>* %alloc.0.0, align 16
ret void
}
declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind