Unverified Commit 2b8d706b authored by Roman Lebedev's avatar Roman Lebedev
Browse files

[IR] GetUnderlyingObject(), stripPointerCastsAndOffsets(): don't crash on...

[IR] GetUnderlyingObject(), stripPointerCastsAndOffsets(): don't crash on `bitcast <1 x i8*> to i8*`

I'm not sure how to write standalone tests for each of two changes here.
If either one of these two fixes is missing, the test fill crash.
parent 381054a9
......@@ -4147,6 +4147,8 @@ Value *llvm::GetUnderlyingObject(Value *V, const DataLayout &DL,
} else if (Operator::getOpcode(V) == Instruction::BitCast ||
Operator::getOpcode(V) == Instruction::AddrSpaceCast) {
V = cast<Operator>(V)->getOperand(0);
if (!V->getType()->isPointerTy())
return V;
} else if (GlobalAlias *GA = dyn_cast<GlobalAlias>(V)) {
if (GA->isInterposable())
return V;
......@@ -552,6 +552,8 @@ static const Value *stripPointerCastsAndOffsets(
V = GEP->getPointerOperand();
} else if (Operator::getOpcode(V) == Instruction::BitCast) {
V = cast<Operator>(V)->getOperand(0);
if (!V->getType()->isPointerTy())
return V;
} else if (StripKind != PSK_ZeroIndicesSameRepresentation &&
Operator::getOpcode(V) == Instruction::AddrSpaceCast) {
// TODO: If we know an address space cast will not change the
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instsimplify -S | FileCheck %s
target datalayout = "e-p:64:64:64-p1:16:16:16-p2:32:32:32-p3:64:64:64-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-n8:16:32:64"
declare void @usei8ptr(i8* %ptr)
; Ensure that we do not crash when looking at such a weird bitcast.
define i1 @bitcast_from_single_element_pointer_vector_to_pointer(<1 x i8*> %ptr1vec, i8* %ptr2) {
%ptr1 = bitcast <1 x i8*> %ptr1vec to i8*
call void @usei8ptr(i8* %ptr1)
%cmp = icmp eq i8* %ptr1, %ptr2
ret i1 %cmp
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