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[SYCL] Cast to correct address space for _alloca #6050

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Merged
steffenlarsen merged 1 commit into from
Apr 26, 2022
Merged

[SYCL] Cast to correct address space for _alloca #6050

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7 changes: 3 additions & 4 deletions clang/lib/CodeGen/CGExprScalar.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2057,10 +2057,9 @@ Value *ScalarExprEmitter::VisitCastExpr(CastExpr *CE) {
llvm::Type *SrcTy = Src->getType();
llvm::Type *DstTy = ConvertType(DestTy);
if (SrcTy->isPtrOrPtrVectorTy() && DstTy->isPtrOrPtrVectorTy() &&
SrcTy->getPointerAddressSpace() != DstTy->getPointerAddressSpace()) {
llvm_unreachable("wrong cast for pointers in different address spaces"
"(must be an address space cast)!");
}
SrcTy->getPointerAddressSpace() != DstTy->getPointerAddressSpace())
Src = Builder.CreateAddrSpaceCast(
Src, llvm::PointerType::get(SrcTy, DstTy->getPointerAddressSpace()));

if (CGF.SanOpts.has(SanitizerKind::CFIUnrelatedCast)) {
if (auto *PT = DestTy->getAs<PointerType>()) {
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13 changes: 13 additions & 0 deletions clang/test/CodeGenSYCL/address-space-builtin-alloca.cpp
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@@ -0,0 +1,13 @@
// RUN: %clang_cc1 -triple spir64-unknown-linux -fsycl-is-device -disable-llvm-passes -emit-llvm -x c++ %s -o - | FileCheck %s

// Test to verify that address space cast is generated correctly for __builtin_alloca

__attribute__((sycl_device)) void foo() {
// CHECK: %TestVar = alloca i32 addrspace(4)*, align 8
// CHECK: %TestVar.ascast = addrspacecast i32 addrspace(4)** %TestVar to i32 addrspace(4)* addrspace(4)*
// CHECK: %[[ALLOCA:[0-9]+]] = alloca i8, i64 1, align 8
// CHECK: %[[ADDRSPCAST:[0-9]+]] = addrspacecast i8* %[[ALLOCA]] to i8* addrspace(4)*
// CHECK: %[[BITCAST:[0-9]+]] = bitcast i8* addrspace(4)* %[[ADDRSPCAST]] to i32 addrspace(4)*
// CHECK: store i32 addrspace(4)* %[[BITCAST]], i32 addrspace(4)* addrspace(4)* %TestVar.ascast, align 8
int *TestVar = (int *)__builtin_alloca(1);
}