glsl: Rework var alloc to not assign unused results
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1269a0cf8b
commit
9f3ffb996b
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@ -122,11 +122,9 @@ EmitContext::EmitContext(IR::Program& program, Bindings& bindings, const Profile
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void EmitContext::SetupExtensions(std::string&) {
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header += "#extension GL_ARB_separate_shader_objects : enable\n";
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if (stage != Stage::Compute) {
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// TODO: track this usage
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header += "#extension GL_ARB_sparse_texture2 : enable\n";
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header += "#extension GL_EXT_texture_shadow_lod : enable\n";
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}
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if (info.uses_int64) {
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header += "#extension GL_ARB_gpu_shader_int64 : enable\n";
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}
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@ -37,7 +37,13 @@ public:
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template <GlslVarType type, typename... Args>
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void Add(const char* format_str, IR::Inst& inst, Args&&... args) {
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code += fmt::format(format_str, var_alloc.Define(inst, type), std::forward<Args>(args)...);
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const auto var_def{var_alloc.AddDefine(inst, type)};
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if (var_def.empty()) {
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// skip assigment.
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code += fmt::format(&format_str[3], std::forward<Args>(args)...);
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} else {
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code += fmt::format(format_str, var_def, std::forward<Args>(args)...);
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}
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// TODO: Remove this
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code += '\n';
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}
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@ -11,8 +11,7 @@
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namespace Shader::Backend::GLSL {
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namespace {
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static constexpr std::string_view cas_loop{R"({};
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for (;;){{
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static constexpr std::string_view cas_loop{R"(for (;;){{
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uint old_value={};
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{}=atomicCompSwap({},old_value,{}({},{}));
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if ({}==old_value){{break;}}
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@ -22,14 +21,14 @@ void SharedCasFunction(EmitContext& ctx, IR::Inst& inst, std::string_view offset
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std::string_view value, std::string_view function) {
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const auto ret{ctx.var_alloc.Define(inst, GlslVarType::U32)};
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const std::string smem{fmt::format("smem[{}/4]", offset)};
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ctx.Add(cas_loop.data(), ret, smem, ret, smem, function, smem, value, ret);
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ctx.Add(cas_loop.data(), smem, ret, smem, function, smem, value, ret);
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}
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void SsboCasFunction(EmitContext& ctx, IR::Inst& inst, const IR::Value& binding,
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const IR::Value& offset, std::string_view value, std::string_view function) {
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const auto ret{ctx.var_alloc.Define(inst, GlslVarType::U32)};
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const std::string ssbo{fmt::format("ssbo{}[{}]", binding.U32(), offset.U32())};
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ctx.Add(cas_loop.data(), ret, ssbo, ret, ssbo, function, ssbo, value, ret);
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ctx.Add(cas_loop.data(), ssbo, ret, ssbo, function, ssbo, value, ret);
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}
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void SsboCasFunctionF32(EmitContext& ctx, IR::Inst& inst, const IR::Value& binding,
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@ -37,7 +36,7 @@ void SsboCasFunctionF32(EmitContext& ctx, IR::Inst& inst, const IR::Value& bindi
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std::string_view function) {
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const std::string ssbo{fmt::format("ssbo{}[{}]", binding.U32(), offset.U32())};
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const auto ret{ctx.var_alloc.Define(inst, GlslVarType::U32)};
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ctx.Add(cas_loop.data(), ret, ssbo, ret, ssbo, function, ssbo, value, ret);
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ctx.Add(cas_loop.data(), ssbo, ret, ssbo, function, ssbo, value, ret);
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ctx.AddF32("{}=uintBitsToFloat({});", inst, ret);
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}
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} // namespace
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@ -26,7 +26,13 @@ void EmitIdentity(EmitContext&, IR::Inst& inst, const IR::Value& value) {
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}
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void EmitConditionRef(EmitContext& ctx, IR::Inst& inst, const IR::Value& value) {
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ctx.AddU1("{}={};", inst, ctx.var_alloc.Consume(value));
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// Fake one usage to get a real variable out of the condition
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inst.DestructiveAddUsage(1);
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const auto ret{ctx.var_alloc.Define(inst, GlslVarType::U1)};
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const auto input{ctx.var_alloc.Consume(value)};
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if (ret != input) {
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ctx.Add("{}={};", ret, input);
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}
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}
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void EmitBitCastU16F16([[maybe_unused]] EmitContext& ctx, [[maybe_unused]] IR::Inst& inst) {
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@ -9,8 +9,14 @@
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#include "shader_recompiler/frontend/ir/value.h"
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namespace Shader::Backend::GLSL {
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namespace {
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static constexpr std::string_view SWIZZLE{"xyzw"};
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void CompositeInsert(EmitContext& ctx, std::string_view result, std::string_view composite,
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std::string_view object, u32 index) {
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ctx.Add("{}={};", result, composite);
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ctx.Add("{}.{}={};", result, SWIZZLE[index], object);
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}
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} // namespace
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void EmitCompositeConstructU32x2(EmitContext& ctx, IR::Inst& inst, std::string_view e1,
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std::string_view e2) {
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ctx.AddU32x2("{}=uvec2({},{});", inst, e1, e2);
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@ -41,19 +47,22 @@ void EmitCompositeExtractU32x4(EmitContext& ctx, IR::Inst& inst, std::string_vie
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ctx.AddU32("{}={}.{};", inst, composite, SWIZZLE[index]);
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}
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void EmitCompositeInsertU32x2(EmitContext& ctx, std::string_view composite, std::string_view object,
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u32 index) {
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ctx.Add("{}.{}={};", composite, SWIZZLE[index], object);
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void EmitCompositeInsertU32x2(EmitContext& ctx, IR::Inst& inst, std::string_view composite,
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std::string_view object, u32 index) {
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const auto ret{ctx.var_alloc.Define(inst, GlslVarType::U32x2)};
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CompositeInsert(ctx, ret, composite, object, index);
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}
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void EmitCompositeInsertU32x3(EmitContext& ctx, std::string_view composite, std::string_view object,
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u32 index) {
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ctx.Add("{}.{}={};", composite, SWIZZLE[index], object);
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void EmitCompositeInsertU32x3(EmitContext& ctx, IR::Inst& inst, std::string_view composite,
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std::string_view object, u32 index) {
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const auto ret{ctx.var_alloc.Define(inst, GlslVarType::U32x3)};
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CompositeInsert(ctx, ret, composite, object, index);
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}
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void EmitCompositeInsertU32x4(EmitContext& ctx, std::string_view composite, std::string_view object,
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u32 index) {
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ctx.Add("{}.{}={};", composite, SWIZZLE[index], object);
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void EmitCompositeInsertU32x4(EmitContext& ctx, IR::Inst& inst, std::string_view composite,
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std::string_view object, u32 index) {
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const auto ret{ctx.var_alloc.Define(inst, GlslVarType::U32x4)};
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CompositeInsert(ctx, ret, composite, object, index);
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}
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void EmitCompositeConstructF16x2([[maybe_unused]] EmitContext& ctx,
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@ -146,19 +155,22 @@ void EmitCompositeExtractF32x4(EmitContext& ctx, IR::Inst& inst, std::string_vie
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ctx.AddF32("{}={}.{};", inst, composite, SWIZZLE[index]);
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}
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void EmitCompositeInsertF32x2(EmitContext& ctx, std::string_view composite, std::string_view object,
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u32 index) {
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ctx.Add("{}.{}={};", composite, SWIZZLE[index], object);
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void EmitCompositeInsertF32x2(EmitContext& ctx, IR::Inst& inst, std::string_view composite,
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std::string_view object, u32 index) {
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const auto ret{ctx.var_alloc.Define(inst, GlslVarType::F32x2)};
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CompositeInsert(ctx, ret, composite, object, index);
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}
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void EmitCompositeInsertF32x3(EmitContext& ctx, std::string_view composite, std::string_view object,
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u32 index) {
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ctx.Add("{}.{}={};", composite, SWIZZLE[index], object);
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void EmitCompositeInsertF32x3(EmitContext& ctx, IR::Inst& inst, std::string_view composite,
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std::string_view object, u32 index) {
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const auto ret{ctx.var_alloc.Define(inst, GlslVarType::F32x3)};
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CompositeInsert(ctx, ret, composite, object, index);
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}
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void EmitCompositeInsertF32x4(EmitContext& ctx, std::string_view composite, std::string_view object,
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u32 index) {
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ctx.Add("{}.{}={};", composite, SWIZZLE[index], object);
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void EmitCompositeInsertF32x4(EmitContext& ctx, IR::Inst& inst, std::string_view composite,
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std::string_view object, u32 index) {
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const auto ret{ctx.var_alloc.Define(inst, GlslVarType::F32x4)};
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CompositeInsert(ctx, ret, composite, object, index);
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}
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void EmitCompositeConstructF64x2([[maybe_unused]] EmitContext& ctx) {
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@ -26,7 +26,7 @@ void EmitPhi(EmitContext& ctx, IR::Inst& inst);
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void EmitVoid(EmitContext& ctx);
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void EmitIdentity(EmitContext& ctx, IR::Inst& inst, const IR::Value& value);
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void EmitConditionRef(EmitContext& ctx, IR::Inst& inst, const IR::Value& value);
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void EmitReference(EmitContext&);
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void EmitReference(EmitContext& ctx, const IR::Value& value);
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void EmitPhiMove(EmitContext& ctx, const IR::Value& phi, const IR::Value& value);
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void EmitBranch(EmitContext& ctx, std::string_view label);
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void EmitBranchConditional(EmitContext& ctx, std::string_view condition,
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@ -165,12 +165,12 @@ void EmitCompositeExtractU32x3(EmitContext& ctx, IR::Inst& inst, std::string_vie
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u32 index);
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void EmitCompositeExtractU32x4(EmitContext& ctx, IR::Inst& inst, std::string_view composite,
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u32 index);
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void EmitCompositeInsertU32x2(EmitContext& ctx, std::string_view composite, std::string_view object,
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u32 index);
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void EmitCompositeInsertU32x3(EmitContext& ctx, std::string_view composite, std::string_view object,
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u32 index);
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void EmitCompositeInsertU32x4(EmitContext& ctx, std::string_view composite, std::string_view object,
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u32 index);
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void EmitCompositeInsertU32x2(EmitContext& ctx, IR::Inst& inst, std::string_view composite,
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std::string_view object, u32 index);
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void EmitCompositeInsertU32x3(EmitContext& ctx, IR::Inst& inst, std::string_view composite,
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std::string_view object, u32 index);
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void EmitCompositeInsertU32x4(EmitContext& ctx, IR::Inst& inst, std::string_view composite,
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std::string_view object, u32 index);
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void EmitCompositeConstructF16x2(EmitContext& ctx, std::string_view e1, std::string_view e2);
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void EmitCompositeConstructF16x3(EmitContext& ctx, std::string_view e1, std::string_view e2,
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std::string_view e3);
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@ -197,12 +197,12 @@ void EmitCompositeExtractF32x3(EmitContext& ctx, IR::Inst& inst, std::string_vie
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u32 index);
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void EmitCompositeExtractF32x4(EmitContext& ctx, IR::Inst& inst, std::string_view composite,
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u32 index);
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void EmitCompositeInsertF32x2(EmitContext& ctx, std::string_view composite, std::string_view object,
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u32 index);
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void EmitCompositeInsertF32x3(EmitContext& ctx, std::string_view composite, std::string_view object,
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u32 index);
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void EmitCompositeInsertF32x4(EmitContext& ctx, std::string_view composite, std::string_view object,
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u32 index);
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void EmitCompositeInsertF32x2(EmitContext& ctx, IR::Inst& inst, std::string_view composite,
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std::string_view object, u32 index);
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void EmitCompositeInsertF32x3(EmitContext& ctx, IR::Inst& inst, std::string_view composite,
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std::string_view object, u32 index);
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void EmitCompositeInsertF32x4(EmitContext& ctx, IR::Inst& inst, std::string_view composite,
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std::string_view object, u32 index);
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void EmitCompositeConstructF64x2(EmitContext& ctx);
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void EmitCompositeConstructF64x3(EmitContext& ctx);
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void EmitCompositeConstructF64x4(EmitContext& ctx);
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@ -25,7 +25,7 @@ void EmitPhi(EmitContext& ctx, IR::Inst& phi) {
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}
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if (!phi.Definition<Id>().is_valid) {
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// The phi node wasn't forward defined
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ctx.Add("{};", ctx.var_alloc.Define(phi, phi.Arg(0).Type()));
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ctx.var_alloc.PhiDefine(phi, phi.Arg(0).Type());
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}
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}
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@ -33,8 +33,8 @@ void EmitVoid(EmitContext& ctx) {
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// NotImplemented();
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}
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void EmitReference(EmitContext&) {
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// NotImplemented();
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void EmitReference(EmitContext& ctx, const IR::Value& value) {
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ctx.var_alloc.Consume(value);
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}
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void EmitPhiMove(EmitContext& ctx, const IR::Value& phi_value, const IR::Value& value) {
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@ -42,7 +42,7 @@ void EmitPhiMove(EmitContext& ctx, const IR::Value& phi_value, const IR::Value&
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const auto phi_type{phi.Arg(0).Type()};
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if (!phi.Definition<Id>().is_valid) {
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// The phi node wasn't forward defined
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ctx.Add("{};", ctx.var_alloc.Define(phi, phi_type));
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ctx.var_alloc.PhiDefine(phi, phi_type);
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}
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const auto phi_reg{ctx.var_alloc.Consume(IR::Value{&phi})};
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const auto val_reg{ctx.var_alloc.Consume(value)};
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@ -110,7 +110,6 @@ std::string VarAlloc::Define(IR::Inst& inst, GlslVarType type) {
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} else {
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Id id{};
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id.type.Assign(type);
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// id.is_null.Assign(1);
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GetUseTracker(type).uses_temp = true;
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inst.SetDefinition<Id>(id);
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}
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@ -121,6 +120,20 @@ std::string VarAlloc::Define(IR::Inst& inst, IR::Type type) {
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return Define(inst, RegType(type));
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}
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std::string VarAlloc::PhiDefine(IR::Inst& inst, IR::Type type) {
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return AddDefine(inst, RegType(type));
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}
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std::string VarAlloc::AddDefine(IR::Inst& inst, GlslVarType type) {
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if (inst.HasUses()) {
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inst.SetDefinition<Id>(Alloc(type));
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return Representation(inst.Definition<Id>());
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} else {
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return "";
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}
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return Representation(inst.Definition<Id>());
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}
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std::string VarAlloc::Consume(const IR::Value& value) {
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return value.IsImmediate() ? MakeImm(value) : ConsumeInst(*value.InstRecursive());
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}
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@ -223,6 +236,8 @@ VarAlloc::UseTracker& VarAlloc::GetUseTracker(GlslVarType type) {
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switch (type) {
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case GlslVarType::U1:
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return var_bool;
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case GlslVarType::F16x2:
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return var_f16x2;
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case GlslVarType::U32:
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return var_u32;
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case GlslVarType::S32:
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@ -62,9 +62,15 @@ public:
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bool uses_temp{};
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};
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/// Used for explicit usages of variables, may revert to temporaries
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std::string Define(IR::Inst& inst, GlslVarType type);
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std::string Define(IR::Inst& inst, IR::Type type);
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/// Used to assign variables used by the IR. May return a blank string if
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/// the instruction's result is unused in the IR.
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std::string AddDefine(IR::Inst& inst, GlslVarType type);
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std::string PhiDefine(IR::Inst& inst, IR::Type type);
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std::string Consume(const IR::Value& value);
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std::string ConsumeInst(IR::Inst& inst);
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