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writer/msl: Fix array stride calculations 

We shouldn't be calculating array strides with the packed element size.

Bug: tint:180
Bug: tint:649
Bug: tint:898
Change-Id: Ifa23517480435610b20c1597c2fc2c2837f4280a
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/55257
Commit-Queue: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: James Price <jrprice@google.com>
This commit is contained in:
Ben Clayton 2021-06-21 19:27:56 +00:00 committed by Tint LUCI CQ
parent a05669ae71
commit 8d133e2ca5
2 changed files with 42 additions and 2 deletions
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3
src/writer/msl/generator_impl.cc
View File

@ -1962,14 +1962,13 @@ GeneratorImpl::SizeAndAlign GeneratorImpl::MslPackedTypeSizeAndAlign(
}
if (auto* arr = ty->As<sem::Array>()) {
auto el_size_align = MslPackedTypeSizeAndAlign(arr->ElemType());
if (!arr->IsStrideImplicit()) {
TINT_ICE(diagnostics_) << "arrays with explicit strides should have "
"removed with the PadArrayElements transform";
return {};
}
auto num_els = std::max<uint32_t>(arr->Count(), 1);
return SizeAndAlign{el_size_align.size * num_els, el_size_align.align};
return SizeAndAlign{arr->Stride() * num_els, arr->Align()};
}
if (auto* str = ty->As<sem::Struct>()) {

41
src/writer/msl/generator_impl_type_test.cc
View File

@ -524,6 +524,47 @@ TEST_F(MslGeneratorImplTest, EmitType_Struct_Layout_ArrayDefaultStride) {
#undef ALL_FIELDS
}
TEST_F(MslGeneratorImplTest, EmitType_Struct_Layout_ArrayVec3DefaultStride) {
// array: size(64), align(16)
auto* array = ty.array(ty.vec3<f32>(), 4);
auto* s =
Structure("S",
{
Member("a", ty.i32()),
Member("b", array),
Member("c", ty.i32()),
},
ast::DecorationList{create<ast::StructBlockDecoration>()});
Global("G", ty.Of(s), ast::StorageClass::kStorage, ast::Access::kRead,
ast::DecorationList{
create<ast::BindingDecoration>(0),
create<ast::GroupDecoration>(0),
});
GeneratorImpl& gen = Build();
auto* sem_s = program->TypeOf(s)->As<sem::Struct>();
ASSERT_TRUE(gen.EmitStructType(sem_s)) << gen.error();
// ALL_FIELDS() calls the macro FIELD(ADDR, TYPE, NAME, SUFFIX)
// for each field of the structure s.
#define ALL_FIELDS() \
FIELD(0x0000, int, a, /*NO SUFFIX*/) \
FIELD(0x0004, int8_t, tint_pad_0, [12]) \
FIELD(0x0010, float3, b, [4]) \
FIELD(0x0050, int, c, /*NO SUFFIX*/) \
FIELD(0x0054, int8_t, tint_pad_1, [12])
// Check that the generated string is as expected.
#define FIELD(ADDR, TYPE, NAME, SUFFIX) \
" /* " #ADDR " */ " #TYPE " " #NAME #SUFFIX ";\n"
auto* expect = "struct S {\n" ALL_FIELDS() "};\n";
#undef FIELD
EXPECT_EQ(gen.result(), expect);
}
TEST_F(MslGeneratorImplTest, AttemptTintPadSymbolCollision) {
auto* s = Structure(
"S",