Merge pull request #243 from KhronosGroup/fix-242
Declare undefined variables (OpUndef) upfront.
This commit is contained in:
commit
98b0c29f9d
29
reference/shaders/asm/frag/undef-variable-store.asm.frag
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29
reference/shaders/asm/frag/undef-variable-store.asm.frag
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@ -0,0 +1,29 @@
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#version 450
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layout(location = 0) out vec4 _entryPointOutput;
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vec4 _38;
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vec4 _47;
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void main()
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{
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vec4 _27;
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do
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{
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vec2 _26 = vec2(0.0);
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if (_26.x != 0.0)
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{
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_27 = vec4(1.0, 0.0, 0.0, 1.0);
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break;
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}
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else
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{
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_27 = vec4(1.0, 1.0, 0.0, 1.0);
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break;
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}
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_27 = _38;
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break;
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} while (false);
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_entryPointOutput = _27;
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}
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@ -8,7 +8,6 @@ layout(binding = 0, std430) buffer SSBO
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void test()
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{
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float m;
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if (_11.data != 0.0)
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{
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float tmp = 10.0;
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@ -68,6 +67,7 @@ void test()
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{
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}
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_11.data = h;
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float m;
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do
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{
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} while (m != 20.0);
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85
shaders/asm/frag/undef-variable-store.asm.frag
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85
shaders/asm/frag/undef-variable-store.asm.frag
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@ -0,0 +1,85 @@
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; SPIR-V
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; Version: 1.0
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; Generator: Khronos Glslang Reference Front End; 1
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; Bound: 50
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; Schema: 0
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OpCapability Shader
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%1 = OpExtInstImport "GLSL.std.450"
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OpMemoryModel Logical GLSL450
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OpEntryPoint Fragment %fragmentProgram "main" %_entryPointOutput
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OpExecutionMode %fragmentProgram OriginUpperLeft
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OpSource HLSL 500
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OpName %fragmentProgram "fragmentProgram"
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OpName %_fragmentProgram_ "@fragmentProgram("
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OpName %uv "uv"
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OpName %_entryPointOutput "@entryPointOutput"
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OpDecorate %_entryPointOutput Location 0
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%void = OpTypeVoid
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%3 = OpTypeFunction %void
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%float = OpTypeFloat 32
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%v4float = OpTypeVector %float 4
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%8 = OpTypeFunction %v4float
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%v2float = OpTypeVector %float 2
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%_ptr_Function_v2float = OpTypePointer Function %v2float
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%float_0 = OpConstant %float 0
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%15 = OpConstantComposite %v2float %float_0 %float_0
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%uint = OpTypeInt 32 0
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%uint_0 = OpConstant %uint 0
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%_ptr_Function_float = OpTypePointer Function %float
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%bool = OpTypeBool
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%float_1 = OpConstant %float 1
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%26 = OpConstantComposite %v4float %float_1 %float_0 %float_0 %float_1
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%29 = OpConstantComposite %v4float %float_1 %float_1 %float_0 %float_1
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%_ptr_Output_v4float = OpTypePointer Output %v4float
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%_entryPointOutput = OpVariable %_ptr_Output_v4float Output
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%_ptr_Function_v4float = OpTypePointer Function %v4float
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%false = OpConstantFalse %bool
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%fragmentProgram = OpFunction %void None %3
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%5 = OpLabel
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%35 = OpVariable %_ptr_Function_v2float Function
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%37 = OpVariable %_ptr_Function_v4float Function
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OpBranch %38
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%38 = OpLabel
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OpLoopMerge %39 %40 None
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OpBranch %41
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%41 = OpLabel
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OpStore %35 %15
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%42 = OpAccessChain %_ptr_Function_float %35 %uint_0
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%43 = OpLoad %float %42
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%44 = OpFOrdNotEqual %bool %43 %float_0
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OpSelectionMerge %45 None
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OpBranchConditional %44 %46 %47
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%46 = OpLabel
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OpStore %37 %26
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OpBranch %39
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%47 = OpLabel
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OpStore %37 %29
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OpBranch %39
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%45 = OpLabel
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%48 = OpUndef %v4float
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OpStore %37 %48
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OpBranch %39
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%40 = OpLabel
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OpBranchConditional %false %38 %39
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%39 = OpLabel
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%34 = OpLoad %v4float %37
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OpStore %_entryPointOutput %34
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OpReturn
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OpFunctionEnd
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%_fragmentProgram_ = OpFunction %v4float None %8
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%10 = OpLabel
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%uv = OpVariable %_ptr_Function_v2float Function
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OpStore %uv %15
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%19 = OpAccessChain %_ptr_Function_float %uv %uint_0
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%20 = OpLoad %float %19
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%22 = OpFOrdNotEqual %bool %20 %float_0
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OpSelectionMerge %24 None
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OpBranchConditional %22 %23 %28
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%23 = OpLabel
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OpReturnValue %26
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%28 = OpLabel
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OpReturnValue %29
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%24 = OpLabel
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%31 = OpUndef %v4float
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OpReturnValue %31
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OpFunctionEnd
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@ -130,6 +130,13 @@ bool CFG::post_order_visit(uint32_t block_id)
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break;
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}
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// If this is a loop header, add an implied branch to the merge target.
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// This is needed to avoid annoying cases with do { ... } while(false) loops often generated by inliners.
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// To the CFG, this is linear control flow, but we risk picking the do/while scope as our dominating block.
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// This makes sure that if we are accessing a variable outside the do/while, we choose the loop header as dominator.
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if (block.merge == SPIRBlock::MergeLoop)
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add_branch(block_id, block.merge_block);
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// Then visit ourselves. Start counting at one, to let 0 be a magic value for testing back vs. crossing edges.
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visit_order[block_id] = ++visit_count;
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post_order.push_back(block_id);
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@ -181,7 +188,7 @@ void DominatorBuilder::add_block(uint32_t block)
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void DominatorBuilder::lift_continue_block_dominator()
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{
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// It is possible for a continue block to be the dominator if a variable is only accessed inside the while block of a do-while loop.
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// It is possible for a continue block to be the dominator of a variable is only accessed inside the while block of a do-while loop.
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// We cannot safely declare variables inside a continue block, so move any variable declared
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// in a continue block to the entry block to simplify.
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// It makes very little sense for a continue block to ever be a dominator, so fall back to the simplest
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@ -729,6 +729,12 @@ struct SPIRConstant : IVariant
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return m.columns;
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}
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SPIRConstant(uint32_t constant_type_)
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: constant_type(constant_type_)
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{
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std::memset(&m, 0, sizeof(m));
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}
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SPIRConstant(uint32_t constant_type_, const uint32_t *elements, uint32_t num_elements)
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: constant_type(constant_type_)
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{
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@ -242,6 +242,8 @@ void CompilerCPP::emit_resources()
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if (emitted)
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statement("");
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declare_undefined_values();
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statement("inline void init(spirv_cross_shader& s)");
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begin_scope();
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statement(resource_type, "::init(s);");
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@ -1650,6 +1650,14 @@ void Compiler::parse(const Instruction &instruction)
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break;
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}
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case OpConstantNull:
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{
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uint32_t id = ops[1];
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uint32_t type = ops[0];
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set<SPIRConstant>(id, type);
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break;
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}
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case OpSpecConstantComposite:
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case OpConstantComposite:
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{
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@ -1578,6 +1578,23 @@ void CompilerGLSL::emit_declared_builtin_block(StorageClass storage, ExecutionMo
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}
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}
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void CompilerGLSL::declare_undefined_values()
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{
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bool emitted = false;
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for (auto &id : ids)
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{
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if (id.get_type() != TypeUndef)
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continue;
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auto &undef = id.get<SPIRUndef>();
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statement(variable_decl(get<SPIRType>(undef.basetype), to_name(undef.self), undef.self), ";");
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emitted = true;
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}
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if (emitted)
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statement("");
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}
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void CompilerGLSL::emit_resources()
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{
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auto &execution = get_entry_point();
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@ -1772,6 +1789,8 @@ void CompilerGLSL::emit_resources()
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if (emitted)
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statement("");
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declare_undefined_values();
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}
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// Returns a string representation of the ID, usable as a function arg.
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@ -464,6 +464,8 @@ protected:
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bool type_is_empty(const SPIRType &type);
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void declare_undefined_values();
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private:
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void init()
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{
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@ -845,6 +845,8 @@ void CompilerHLSL::emit_resources()
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if (emitted)
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statement("");
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declare_undefined_values();
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if (requires_op_fmod)
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{
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statement("float mod(float x, float y)");
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@ -990,6 +990,8 @@ void CompilerMSL::emit_resources()
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}
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}
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declare_undefined_values();
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// Output interface blocks.
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emit_interface_block(stage_in_var_id);
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for (auto &nsi_var : non_stage_in_input_var_ids)
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