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Fix a problem where we had bitcasted operands that gave us

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odd offsets since the bitcasted pointer size and the offset pointer
size are going to be different types for the GEP vs base object.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96134 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher 2010-02-13 23:38:01 +00:00
parent 18c67b994c
commit 77ffe3b31e
2 changed files with 18 additions and 5 deletions
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14
lib/Transforms/InstCombine/InstCombineCalls.cpp
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@ -334,17 +334,21 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
// Make sure we're not a constant offset from an external
// global.
Value *Operand = GEP->getPointerOperand();
Operand = Operand->stripPointerCasts();
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Operand))
if (!GV->hasDefinitiveInitializer()) break;
// Get what we're pointing to and its size.
const PointerType *PT =
// Get what we're pointing to and its size.
const PointerType *BaseType =
cast<PointerType>(Operand->getType());
size_t Size = TD->getTypeAllocSize(PT->getElementType());
size_t Size = TD->getTypeAllocSize(BaseType->getElementType());
// Get the current byte offset into the thing.
// Get the current byte offset into the thing. Use the original
// operand in case we're looking through a bitcast.
SmallVector<Value*, 8> Ops(CE->op_begin()+1, CE->op_end());
size_t Offset = TD->getIndexedOffset(PT, &Ops[0], Ops.size());
const PointerType *OffsetType =
cast<PointerType>(GEP->getPointerOperand()->getType());
size_t Offset = TD->getIndexedOffset(OffsetType, &Ops[0], Ops.size());
assert(Size >= Offset);

9
test/Transforms/InstCombine/objsize.ll
View File

@ -63,4 +63,13 @@ entry:
unreachable
}
@.str5 = private constant [9 x i32] [i32 97, i32 98, i32 99, i32 100, i32 0, i32
101, i32 102, i32 103, i32 0], align 4 ;
define i32 @test2() nounwind {
; CHECK: @test2
; CHECK-NEXT: ret i32 34
%1 = call i32 @llvm.objectsize.i32(i8* getelementptr (i8* bitcast ([9 x i32]* @.str5 to i8*), i32 2), i1 false)
ret i32 %1
}
declare i32 @llvm.objectsize.i32(i8*, i1) nounwind readonly