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[shader_recompiler, spir-v] Implement iteration limit in DefineWriteStorageCasLoop

This commit is contained in:
CamilleLaVey 2026-01-11 21:03:48 -04:00
parent 1cb8bcf531
commit 39732ae6d5
1 changed files with 12 additions and 0 deletions
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12
src/shader_recompiler/backend/spirv/spirv_emit_context.cpp
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@ -906,6 +906,9 @@ void EmitContext::DefineWriteStorageCasLoopFunction(const Info& info) {
const Id continue_label{OpLabel()};
const Id endloop_label{OpLabel()};
const Id beginloop_label{OpLabel()};
const Id max_iterations{Const(16u)};
const Id iteration_counter{OpVariable(TypePointer(spv::StorageClass::Function, U32[1]),
spv::StorageClass::Function, u32_zero_value)};
OpBranch(beginloop_label);
AddLabel(beginloop_label);
@ -913,11 +916,20 @@ void EmitContext::DefineWriteStorageCasLoopFunction(const Info& info) {
OpBranch(body_label);
AddLabel(body_label);
const Id current_iteration{OpLoad(U32[1], iteration_counter)};
const Id iteration_exceeded{OpUGreaterThanEqual(U1, current_iteration, max_iterations)};
const Id bailout_label{OpLabel()};
OpSelectionMerge(bailout_label, spv::SelectionControlMask::MaskNone);
OpBranchConditional(iteration_exceeded, bailout_label, bailout_label);
AddLabel(bailout_label);
const Id expected_value{OpLoad(U32[1], pointer)};
const Id desired_value{OpBitFieldInsert(U32[1], expected_value, value, bit_offset, bit_count)};
const Id actual_value{OpAtomicCompareExchange(U32[1], pointer, scope_device, ordering_relaxed,
ordering_relaxed, desired_value, expected_value)};
const Id store_successful{OpIEqual(U1, expected_value, actual_value)};
const Id next_iteration{OpIAdd(U32[1], current_iteration, Const(1u))};
OpStore(iteration_counter, next_iteration);
OpBranchConditional(store_successful, endloop_label, continue_label);
AddLabel(endloop_label);