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shader: preserve scalar buffer offset alignment and carry

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This commit is contained in:
nmzik
2026-09-28 12:58:22 +04:00
parent 4dd35a42b3
commit 0977d859a1
8 changed files with 118 additions and 65 deletions
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tests/ScalarProvenanceTests.cpp
+27 -28
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@@ -488,35 +488,34 @@ void TestSharedIntegerRuntimeDependencies() {
}
void TestConstantBufferBounds() {
Fixture fixture;
const auto memory = fixture.AddMemory(ResourceKind::ScalarBuffer);
const auto buffer =
fixture.Emit(ValueOpcode::GetBufferResource,
{Value(0x3000u), Value(0u), Value(16u), Value(0u)});
const auto read = fixture.EmitMemory(ValueOpcode::ReadConstBuffer,
{buffer, Value(12u)}, memory);
LoadBuffer(fixture, {read, Value(0u), Value(16u), Value(0u)});
fixture.Plan();
struct Case {
uint32_t offset;
uint32_t immediate;
bool valid;
uint32_t expected;
};
for (const auto &test : {Case{12u, 0u, true, 0xa5a5a5a5u},
Case{3u, 1u, true, 0x12345678u},
Case{0xfffffffcu, 4u, false, 0u},
Case{16u, 0u, false, 0u}}) {
Fixture fixture;
const auto memory = fixture.AddMemory(ResourceKind::ScalarBuffer, test.immediate);
const auto buffer =
fixture.Emit(ValueOpcode::GetBufferResource,
{Value(0x3000u), Value(0u), Value(16u), Value(0u)});
const auto read = fixture.EmitMemory(ValueOpcode::ReadConstBuffer,
{buffer, Value(test.offset)}, memory);
LoadBuffer(fixture, {read, Value(0u), Value(16u), Value(0u)});
fixture.Plan();
TestMemory memory_image{{{0x300cu, 0xa5a5a5a5u}}};
SrtRuntime runtime{.read_memory = ReadMemory, .userdata = &memory_image};
std::vector<uint32_t> flat;
Check(SrtWalker(fixture.program, runtime).RefreshFlatBuffer(flat) &&
flat == std::vector<uint32_t>{0xa5a5a5a5u},
"constant-buffer SRT walk failed");
Fixture overflow;
const auto overflow_memory = overflow.AddMemory(ResourceKind::ScalarBuffer);
const auto overflow_buffer =
overflow.Emit(ValueOpcode::GetBufferResource,
{Value(0x3000u), Value(0u), Value(16u), Value(0u)});
const auto overflow_read =
overflow.EmitMemory(ValueOpcode::ReadConstBuffer,
{overflow_buffer, Value(16u)}, overflow_memory);
LoadBuffer(overflow, {overflow_read, Value(0u), Value(16u), Value(0u)});
overflow.Plan();
Check(!SrtWalker(overflow.program, runtime).RefreshFlatBuffer(flat),
"out-of-bounds constant-buffer walk was accepted");
TestMemory memory_image{{{0x3000u, 0x12345678u}, {0x300cu, 0xa5a5a5a5u}}};
SrtRuntime runtime{.read_memory = ReadMemory, .userdata = &memory_image};
std::vector<uint32_t> flat;
Check(SrtWalker(fixture.program, runtime).RefreshFlatBuffer(flat) == test.valid,
"constant-buffer walk misaligned or wrapped its offset components");
Check(test.valid ? flat == std::vector<uint32_t>{test.expected} : memory_image.reads == 0,
"constant-buffer walk read the wrong word or accessed an out-of-bounds address");
}
}
void TestReadLaneElimination() {