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@ -172,38 +172,29 @@ bool IsReference(IR::Inst& inst) {
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return inst.GetOpcode() == IR::Opcode::Reference;
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}
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void Precolor(EmitContext& ctx, const IR::Program& program) {
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void PrecolorInst(IR::Inst& phi) {
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// Insert phi moves before references to avoid overwritting other phis
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const size_t num_args{phi.NumArgs()};
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for (size_t i = 0; i < num_args; ++i) {
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IR::Block& phi_block{*phi.PhiBlock(i)};
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auto it{std::find_if_not(phi_block.rbegin(), phi_block.rend(), IsReference).base()};
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IR::IREmitter ir{phi_block, it};
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const IR::Value arg{phi.Arg(i)};
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if (arg.IsImmediate()) {
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ir.PhiMove(phi, arg);
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} else {
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ir.PhiMove(phi, IR::Value{&RegAlloc::AliasInst(*arg.Inst())});
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}
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}
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for (size_t i = 0; i < num_args; ++i) {
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IR::IREmitter{*phi.PhiBlock(i)}.Reference(IR::Value{&phi});
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}
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}
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void Precolor(const IR::Program& program) {
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for (IR::Block* const block : program.blocks) {
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for (IR::Inst& phi : block->Instructions() | std::views::take_while(IR::IsPhi)) {
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switch (phi.Arg(0).Type()) {
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case IR::Type::U1:
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case IR::Type::U32:
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case IR::Type::F32:
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ctx.reg_alloc.Define(phi);
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break;
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case IR::Type::U64:
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case IR::Type::F64:
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ctx.reg_alloc.LongDefine(phi);
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break;
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default:
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throw NotImplementedException("Phi node type {}", phi.Type());
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}
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// Insert phi moves before references to avoid overwritting them
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const size_t num_args{phi.NumArgs()};
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for (size_t i = 0; i < num_args; ++i) {
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IR::Block& phi_block{*phi.PhiBlock(i)};
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auto it{std::find_if_not(phi_block.rbegin(), phi_block.rend(), IsReference).base()};
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IR::IREmitter ir{phi_block, it};
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const IR::Value arg{phi.Arg(i)};
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if (arg.IsImmediate()) {
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ir.PhiMove(phi, arg);
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} else {
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ir.PhiMove(phi, IR::Value{&RegAlloc::AliasInst(*arg.Inst())});
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}
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}
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for (size_t i = 0; i < num_args; ++i) {
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IR::IREmitter{*phi.PhiBlock(i)}.Reference(IR::Value{&phi});
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}
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PrecolorInst(phi);
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}
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}
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}
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@ -388,7 +379,7 @@ std::string_view GetTessSpacing(TessSpacing spacing) {
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std::string EmitGLASM(const Profile& profile, const RuntimeInfo& runtime_info, IR::Program& program,
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Bindings& bindings) {
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EmitContext ctx{program, bindings, profile, runtime_info};
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Precolor(ctx, program);
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Precolor(program);
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EmitCode(ctx, program);
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std::string header{StageHeader(program.stage)};
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SetupOptions(program, profile, runtime_info, header);
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