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Fix PR1774 and BasicAA/2007-11-05-SizeCrash.ll 

llvm-svn: 43756
This commit is contained in:
Chris Lattner 2007-11-06 05:58:42 +00:00
parent d378cea030
commit 0fc613b85d
2 changed files with 45 additions and 7 deletions
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18
llvm/lib/Analysis/BasicAliasAnalysis.cpp
View File

@ -753,9 +753,8 @@ BasicAliasAnalysis::CheckGEPInstructions(
//
if (const ArrayType *AT = dyn_cast<ArrayType>(BasePtr1Ty))
GEP1Ops[i] = ConstantInt::get(Type::Int64Ty,AT->getNumElements()-1);
else if (const VectorType *PT = dyn_cast<VectorType>(BasePtr1Ty))
GEP1Ops[i] = ConstantInt::get(Type::Int64Ty,PT->getNumElements()-1);
else if (const VectorType *VT = dyn_cast<VectorType>(BasePtr1Ty))
GEP1Ops[i] = ConstantInt::get(Type::Int64Ty,VT->getNumElements()-1);
}
}
@ -765,8 +764,8 @@ BasicAliasAnalysis::CheckGEPInstructions(
if (const ArrayType *AT = dyn_cast<ArrayType>(BasePtr1Ty)) {
if (Op2C->getZExtValue() >= AT->getNumElements())
return MayAlias; // Be conservative with out-of-range accesses
} else if (const VectorType *PT = dyn_cast<VectorType>(BasePtr1Ty)) {
if (Op2C->getZExtValue() >= PT->getNumElements())
} else if (const VectorType *VT = dyn_cast<VectorType>(BasePtr1Ty)) {
if (Op2C->getZExtValue() >= VT->getNumElements())
return MayAlias; // Be conservative with out-of-range accesses
}
} else { // Conservatively assume the minimum value for this index
@ -795,8 +794,13 @@ BasicAliasAnalysis::CheckGEPInstructions(
getTargetData().getIndexedOffset(GEPPointerTy, GEP1Ops, NumGEP1Ops);
int64_t Offset2 =
getTargetData().getIndexedOffset(GEPPointerTy, GEP2Ops, NumGEP2Ops);
assert(Offset1<Offset2 && "There is at least one different constant here!");
assert(Offset1 != Offset2 &&
"There is at least one different constant here!");
// Make sure we compare the absolute difference.
if (Offset1 > Offset2)
std::swap(Offset1, Offset2);
if ((uint64_t)(Offset2-Offset1) >= SizeMax) {
//cerr << "Determined that these two GEP's don't alias ["
// << SizeMax << " bytes]: \n" << *GEP1 << *GEP2;

34
llvm/test/Analysis/BasicAA/2007-11-05-SizeCrash.ll Normal file
View File

@ -0,0 +1,34 @@
; RUN: llvm-as < %s | opt -gvn -disable-output
; PR1774
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"
target triple = "x86_64-unknown-linux-gnu"
%struct.device = type { [20 x i8] }
%struct.pci_device_id = type { i32, i32, i32, i32, i32, i32, i64 }
%struct.usb_bus = type { %struct.device* }
%struct.usb_hcd = type { %struct.usb_bus, i64, [0 x i64] }
@uhci_pci_ids = external constant [1 x %struct.pci_device_id] ; <[1 x %struct.pci_device_id]*> [#uses=1]
@__mod_pci_device_table = alias [1 x %struct.pci_device_id]* @uhci_pci_ids
; <[1 x %struct.pci_device_id]*> [#uses=0]
define i32 @uhci_suspend(%struct.usb_hcd* %hcd) {
entry:
%tmp17 = getelementptr %struct.usb_hcd* %hcd, i32 0, i32 2, i64 1
; <i64*> [#uses=1]
%tmp1718 = bitcast i64* %tmp17 to i32* ; <i32*> [#uses=1]
%tmp19 = load i32* %tmp1718, align 4 ; <i32> [#uses=0]
br i1 false, label %cond_true34, label %done_okay
cond_true34: ; preds = %entry
%tmp631 = getelementptr %struct.usb_hcd* %hcd, i32 0, i32 2, i64
2305843009213693950 ; <i64*> [#uses=1]
%tmp70 = bitcast i64* %tmp631 to %struct.device** ;
%tmp71 = load %struct.device** %tmp70, align 8 ;
ret i32 undef
done_okay: ; preds = %entry
ret i32 undef
}