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Remove calls to GetId in liveness analysis
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Part of KhronosGroup#5691
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@s-perron
s-perron committed May 29, 2024
1 parent 77c40be commit cda9d03
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Showing 3 changed files with 79 additions and 56 deletions.
13 changes: 8 additions & 5 deletions source/opt/eliminate_dead_output_stores_pass.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -92,16 +92,19 @@ void EliminateDeadOutputStoresPass::KillAllDeadStoresOfLocRef(
});
// Compute offset and final type of reference. If no location found
// or any stored locations are live, return without removing stores.
auto ptr_type = type_mgr->GetType(var->type_id())->AsPointer();

Instruction* ptr_type = get_def_use_mgr()->GetDef(var->type_id());
assert(ptr_type && "unexpected var type");
auto var_type = ptr_type->pointee_type();
const uint32_t kPointerTypePointeeIdx = 1;
uint32_t var_type_id =
ptr_type->GetSingleWordInOperand(kPointerTypePointeeIdx);
uint32_t ref_loc = start_loc;
auto curr_type = var_type;
if (ref->opcode() == spv::Op::OpAccessChain ||
ref->opcode() == spv::Op::OpInBoundsAccessChain) {
live_mgr->AnalyzeAccessChainLoc(ref, &curr_type, &ref_loc, &no_loc,
is_patch, /* input */ false);
var_type_id = live_mgr->AnalyzeAccessChainLoc(
ref, var_type_id, &ref_loc, &no_loc, is_patch, /* input */ false);
}
const analysis::Type* curr_type = type_mgr->GetType(var_type_id);
if (no_loc || AnyLocsAreLive(ref_loc, live_mgr->GetLocSize(curr_type)))
return;
// Kill all stores based on this reference
Expand Down
103 changes: 62 additions & 41 deletions source/opt/liveness.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -123,21 +123,29 @@ uint32_t LivenessManager::GetLocSize(const analysis::Type* type) const {
return 1;
}

const analysis::Type* LivenessManager::GetComponentType(
uint32_t index, const analysis::Type* agg_type) const {
auto arr_type = agg_type->AsArray();
if (arr_type) return arr_type->element_type();
auto struct_type = agg_type->AsStruct();
if (struct_type) return struct_type->element_types()[index];
auto mat_type = agg_type->AsMatrix();
if (mat_type) return mat_type->element_type();
auto vec_type = agg_type->AsVector();
assert(vec_type && "unexpected non-aggregate type");
return vec_type->element_type();
uint32_t LivenessManager::GetComponentType(uint32_t index,
uint32_t agg_type_id) const {
analysis::DefUseManager* def_use_mgr = context()->get_def_use_mgr();
Instruction* agg_type_inst = def_use_mgr->GetDef(agg_type_id);

const uint32_t kArrayElementInIdx = 0;
switch (agg_type_inst->opcode()) {
case spv::Op::OpTypeArray:
case spv::Op::OpTypeMatrix:
case spv::Op::OpTypeVector:
return agg_type_inst->GetSingleWordInOperand(kArrayElementInIdx);
case spv::Op::OpTypeStruct:
return agg_type_inst->GetSingleWordInOperand(index);
default:
assert(false && "unexpected aggregate type");
return 0;
}
}

uint32_t LivenessManager::GetLocOffset(uint32_t index,
const analysis::Type* agg_type) const {
uint32_t agg_type_id) const {
analysis::TypeManager* type_mgr = context()->get_type_mgr();
const analysis::Type* agg_type = type_mgr->GetType(agg_type_id);
auto arr_type = agg_type->AsArray();
if (arr_type) return index * GetLocSize(arr_type->element_type());
auto struct_type = agg_type->AsStruct();
Expand All @@ -161,10 +169,10 @@ uint32_t LivenessManager::GetLocOffset(uint32_t index,
return 0;
}

void LivenessManager::AnalyzeAccessChainLoc(const Instruction* ac,
const analysis::Type** curr_type,
uint32_t* offset, bool* no_loc,
bool is_patch, bool input) {
uint32_t LivenessManager::AnalyzeAccessChainLoc(const Instruction* ac,
uint32_t curr_type_id,
uint32_t* offset, bool* no_loc,
bool is_patch, bool input) {
analysis::DefUseManager* def_use_mgr = context()->get_def_use_mgr();
analysis::TypeManager* type_mgr = context()->get_type_mgr();
analysis::DecorationManager* deco_mgr = context()->get_decoration_mgr();
Expand All @@ -179,14 +187,17 @@ void LivenessManager::AnalyzeAccessChainLoc(const Instruction* ac,
skip_first_index = !is_patch;
uint32_t ocnt = 0;
ac->WhileEachInOperand([this, &ocnt, def_use_mgr, type_mgr, deco_mgr,
curr_type, offset, no_loc,
&curr_type_id, offset, no_loc,
skip_first_index](const uint32_t* opnd) {
if (ocnt >= 1) {
// Skip first index's contribution to offset if indicated
Instruction* curr_type_inst = def_use_mgr->GetDef(curr_type_id);
if (ocnt == 1 && skip_first_index) {
auto arr_type = (*curr_type)->AsArray();
assert(arr_type && "unexpected wrapper type");
*curr_type = arr_type->element_type();
assert(curr_type_inst->opcode() == spv::Op::OpTypeArray &&
"unexpected wrapper type");
const uint32_t kArrayElementTypeInIdx = 0;
curr_type_id =
curr_type_inst->GetSingleWordInOperand(kArrayElementTypeInIdx);
ocnt++;
return true;
}
Expand All @@ -196,12 +207,10 @@ void LivenessManager::AnalyzeAccessChainLoc(const Instruction* ac,
// If current type is struct, look for location decoration on member and
// reset offset if found.
auto index = idx_inst->GetSingleWordInOperand(0);
auto str_type = (*curr_type)->AsStruct();
if (str_type) {
if (curr_type_inst->opcode() == spv::Op::OpTypeStruct) {
uint32_t loc = 0;
auto str_type_id = type_mgr->GetId(str_type);
bool no_mem_loc = deco_mgr->WhileEachDecoration(
str_type_id, uint32_t(spv::Decoration::Location),
curr_type_id, uint32_t(spv::Decoration::Location),
[&loc, index, no_loc](const Instruction& deco) {
assert(deco.opcode() == spv::Op::OpMemberDecorate &&
"unexpected decoration");
Expand All @@ -216,19 +225,20 @@ void LivenessManager::AnalyzeAccessChainLoc(const Instruction* ac,
});
if (!no_mem_loc) {
*offset = loc;
*curr_type = GetComponentType(index, *curr_type);
curr_type_id = curr_type_inst->GetSingleWordInOperand(index);
ocnt++;
return true;
}
}

// Update offset and current type based on constant index.
*offset += GetLocOffset(index, *curr_type);
*curr_type = GetComponentType(index, *curr_type);
*offset += GetLocOffset(index, curr_type_id);
curr_type_id = GetComponentType(index, curr_type_id);
}
ocnt++;
return true;
});
return curr_type_id;
}

void LivenessManager::MarkRefLive(const Instruction* ref, Instruction* var) {
Expand Down Expand Up @@ -268,24 +278,34 @@ void LivenessManager::MarkRefLive(const Instruction* ref, Instruction* var) {
// through constant indices and mark those locs live. Assert if no location
// found.
uint32_t offset = loc;
auto curr_type = var_type;
AnalyzeAccessChainLoc(ref, &curr_type, &offset, &no_loc, is_patch);
Instruction* ptr_type_inst =
context()->get_def_use_mgr()->GetDef(var->type_id());
assert(ptr_type && "unexpected var type");
const uint32_t kPointerTypePointeeIdx = 1;
uint32_t var_type_id =
ptr_type_inst->GetSingleWordInOperand(kPointerTypePointeeIdx);
uint32_t curr_type_id =
AnalyzeAccessChainLoc(ref, var_type_id, &offset, &no_loc, is_patch);
auto curr_type = type_mgr->GetType(curr_type_id);
assert(!no_loc && "missing input variable location");
MarkLocsLive(offset, GetLocSize(curr_type));
}

void LivenessManager::ComputeLiveness() {
InitializeAnalysis();
analysis::DefUseManager* def_use_mgr = context()->get_def_use_mgr();
analysis::TypeManager* type_mgr = context()->get_type_mgr();
// Process all input variables
for (auto& var : context()->types_values()) {
if (var.opcode() != spv::Op::OpVariable) {
continue;
}
analysis::Type* var_type = type_mgr->GetType(var.type_id());
analysis::Pointer* ptr_type = var_type->AsPointer();
if (ptr_type->storage_class() != spv::StorageClass::Input) {
Instruction* var_type_inst = def_use_mgr->GetDef(var.type_id());
assert(var_type_inst->opcode() == spv::Op::OpTypePointer &&
"Expected a pointer type");
const uint32_t kPointerTypeStorageClassInIdx = 0;
spv::StorageClass sc = static_cast<spv::StorageClass>(
var_type_inst->GetSingleWordInOperand(kPointerTypeStorageClassInIdx));
if (sc != spv::StorageClass::Input) {
continue;
}
// If var is builtin, mark live if analyzed and continue to next variable
Expand All @@ -295,14 +315,15 @@ void LivenessManager::ComputeLiveness() {
// continue to next variable. Input interface blocks will only appear
// in tesc, tese and geom shaders. Will need to strip off one level of
// arrayness to get to block type.
auto pte_type = ptr_type->pointee_type();
auto arr_type = pte_type->AsArray();
if (arr_type) {
auto elt_type = arr_type->element_type();
auto str_type = elt_type->AsStruct();
if (str_type) {
auto str_type_id = type_mgr->GetId(str_type);
if (AnalyzeBuiltIn(str_type_id)) continue;
const uint32_t kPointerTypePointeeTypeInIdx = 1;
uint32_t pte_type_id =
var_type_inst->GetSingleWordInOperand(kPointerTypePointeeTypeInIdx);
Instruction* pte_type_inst = def_use_mgr->GetDef(pte_type_id);
if (pte_type_inst->opcode() == spv::Op::OpTypeArray) {
uint32_t array_elt_type_id = pte_type_inst->GetSingleWordInOperand(0);
Instruction* arr_elt_type = def_use_mgr->GetDef(array_elt_type_id);
if (arr_elt_type->opcode() == spv::Op::OpTypeStruct) {
if (AnalyzeBuiltIn(array_elt_type_id)) continue;
}
}
// Mark all used locations of var live
Expand Down
19 changes: 9 additions & 10 deletions source/opt/liveness.h
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Original file line number Diff line number Diff line change
Expand Up @@ -41,13 +41,13 @@ class LivenessManager {
// Return true if builtin |bi| is being analyzed.
bool IsAnalyzedBuiltin(uint32_t bi);

// Determine starting loc |offset| and the type |cur_type| of
// access chain |ac|. Set |no_loc| to true if no loc found.
// |is_patch| indicates if patch variable. |input| is true
// if input variable, otherwise output variable.
void AnalyzeAccessChainLoc(const Instruction* ac,
const analysis::Type** curr_type, uint32_t* offset,
bool* no_loc, bool is_patch, bool input = true);
// Return the result type of |ac| when applied to |cur_type|. Set
// |no_loc| to true if no loc found. Set |is_patch| indicates if the variable
// is a patch variable. Set |input| if the variable is an input variable.
// Otherwise it is assumed that the variable is an output variable.
uint32_t AnalyzeAccessChainLoc(const Instruction* ac, uint32_t curr_type_id,
uint32_t* offset, bool* no_loc, bool is_patch,
bool input = true);

// Return size of |type_id| in units of locations
uint32_t GetLocSize(const analysis::Type* type) const;
Expand All @@ -69,12 +69,11 @@ class LivenessManager {
void MarkLocsLive(uint32_t start, uint32_t count);

// Return type of component of aggregate type |agg_type| at |index|
const analysis::Type* GetComponentType(uint32_t index,
const analysis::Type* agg_type) const;
uint32_t GetComponentType(uint32_t index, uint32_t agg_type_id) const;

// Return offset of |index| into aggregate type |agg_type| in units of
// input locations
uint32_t GetLocOffset(uint32_t index, const analysis::Type* agg_type) const;
uint32_t GetLocOffset(uint32_t index, uint32_t agg_type_id) const;

// Populate live_locs_ and live_builtins_
void ComputeLiveness();
Expand Down

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