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Fix assert with GEP ptr vector indexing structs 

Also fix it calculating the wrong value. The struct index
is not a ConstantInt, so it was being interpreted as an array
index.

llvm-svn: 188713
This commit is contained in:
Matt Arsenault 2013-08-19 21:43:16 +00:00
parent 9309322454
commit 74742a1bb0
3 changed files with 31 additions and 5 deletions
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11
llvm/include/llvm/Transforms/Utils/Local.h
View File

@ -203,12 +203,17 @@ Value *EmitGEPOffset(IRBuilderTy *Builder, const DataLayout &TD, User *GEP,
++i, ++GTI) {
Value *Op = *i;
uint64_t Size = TD.getTypeAllocSize(GTI.getIndexedType()) & PtrSizeMask;
if (ConstantInt *OpC = dyn_cast<ConstantInt>(Op)) {
if (OpC->isZero()) continue;
if (Constant *OpC = dyn_cast<Constant>(Op)) {
if (OpC->isZeroValue())
continue;
// Handle a struct index, which adds its field offset to the pointer.
if (StructType *STy = dyn_cast<StructType>(*GTI)) {
Size = TD.getStructLayout(STy)->getElementOffset(OpC->getZExtValue());
if (OpC->getType()->isVectorTy())
OpC = OpC->getSplatValue();
uint64_t OpValue = cast<ConstantInt>(OpC)->getZExtValue();
Size = TD.getStructLayout(STy)->getElementOffset(OpValue);
if (Size)
Result = Builder->CreateAdd(Result, ConstantInt::get(IntPtrTy, Size),

14
llvm/lib/Analysis/ValueTracking.cpp
View File

@ -629,9 +629,19 @@ void llvm::ComputeMaskedBits(Value *V, APInt &KnownZero, APInt &KnownOne,
Value *Index = I->getOperand(i);
if (StructType *STy = dyn_cast<StructType>(*GTI)) {
// Handle struct member offset arithmetic.
if (!TD) return;
const StructLayout *SL = TD->getStructLayout(STy);
if (!TD)
return;
// Handle case when index is vector zeroinitializer
Constant *CIndex = cast<Constant>(Index);
if (CIndex->isZeroValue())
continue;
if (CIndex->getType()->isVectorTy())
Index = CIndex->getSplatValue();
unsigned Idx = cast<ConstantInt>(Index)->getZExtValue();
const StructLayout *SL = TD->getStructLayout(STy);
uint64_t Offset = SL->getElementOffset(Idx);
TrailZ = std::min<unsigned>(TrailZ,
countTrailingZeros(Offset));

11
llvm/test/Transforms/InstCombine/getelementptr.ll
View File

@ -129,6 +129,17 @@ define i1 @test13(i64 %X, %S* %P) {
; CHECK: %C = icmp eq i64 %X, -1
}
define <2 x i1> @test13_vector(<2 x i64> %X, <2 x %S*> %P) nounwind {
; CHECK-LABEL: @test13_vector(
; CHECK-NEXT: shl nuw <2 x i64> %X, <i64 2, i64 2>
; CHECK-NEXT: add <2 x i64> %A.idx, <i64 4, i64 4>
; CHECK-NEXT: icmp eq <2 x i64> %A.offs, zeroinitializer
%A = getelementptr inbounds <2 x %S*> %P, <2 x i64> zeroinitializer, <2 x i32> <i32 1, i32 1>, <2 x i64> %X
%B = getelementptr inbounds <2 x %S*> %P, <2 x i64> <i64 0, i64 0>, <2 x i32> <i32 0, i32 0>
%C = icmp eq <2 x i32*> %A, %B
ret <2 x i1> %C
}
define i1 @test13_i32(i32 %X, %S* %P) {
; CHECK-LABEL: @test13_i32(
; CHECK: %C = icmp eq i32 %X, -1