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ConstantFolding: Don't crash when encountering vector GEP

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ConstantFolding tried to cast one of the scalar indices to a vector
type. Instead, use the vector type only for the first index (which
is the only one allowed to be a vector) and use its scalar type
otherwise.

Fixes PR31250.

Reviewers: majnemer
Differential Revision: https://reviews.llvm.org/D27389

llvm-svn: 289073
This commit is contained in:
Keno Fischer 2016-12-08 17:22:35 +00:00
parent c1ee2b7cbe
commit ab41662e58
2 changed files with 23 additions and 3 deletions
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7
lib/Analysis/ConstantFolding.cpp
View File

@ -734,14 +734,15 @@ Constant *CastGEPIndices(Type *SrcElemTy, ArrayRef<Constant *> Ops,
Type *ResultTy, Optional<unsigned> InRangeIndex,
const DataLayout &DL, const TargetLibraryInfo *TLI) {
Type *IntPtrTy = DL.getIntPtrType(ResultTy);
Type *IntPtrScalarTy = IntPtrTy->getScalarType();
bool Any = false;
SmallVector<Constant*, 32> NewIdxs;
for (unsigned i = 1, e = Ops.size(); i != e; ++i) {
if ((i == 1 ||
!isa<StructType>(GetElementPtrInst::getIndexedType(SrcElemTy,
Ops.slice(1, i - 1)))) &&
Ops[i]->getType() != IntPtrTy) {
!isa<StructType>(GetElementPtrInst::getIndexedType(
SrcElemTy, Ops.slice(1, i - 1)))) &&
Ops[i]->getType() != (i == 1 ? IntPtrTy : IntPtrScalarTy)) {
Any = true;
NewIdxs.push_back(ConstantExpr::getCast(CastInst::getCastOpcode(Ops[i],
true,

19
test/Analysis/ConstantFolding/vectorgep-crash.ll Normal file
View File

@ -0,0 +1,19 @@
; RUN: opt -instcombine -S -o - %s | FileCheck %s
; Tests that we don't crash upon encountering a vector GEP
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
%Dual = type { %Dual.72, %Partials.73 }
%Dual.72 = type { double, %Partials }
%Partials = type { [2 x double] }
%Partials.73 = type { [2 x %Dual.72] }
; Function Attrs: sspreq
define <8 x i64*> @"julia_axpy!_65480"(%Dual* %arg1, <8 x i64> %arg2) {
top:
; CHECK: %VectorGep14 = getelementptr inbounds %Dual, %Dual* %arg1, <8 x i64> %arg2, i32 1, i32 0, i64 0, i32 1, i32 0, i64 0
%VectorGep14 = getelementptr inbounds %Dual, %Dual* %arg1, <8 x i64> %arg2, i32 1, i32 0, i64 0, i32 1, i32 0, i64 0
%0 = bitcast <8 x double*> %VectorGep14 to <8 x i64*>
ret <8 x i64*> %0
}