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glasm: Release phi node registers after they are no longer needed

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This commit is contained in:
ReinUsesLisp 2021-05-25 17:37:35 -03:00 • committed by ameerj
parent 77ee733c3a
commit 48aafe0961
2 changed files with 54 additions and 38 deletions
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53
src/shader_recompiler/backend/glasm/emit_glasm.cpp
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@ -172,38 +172,29 @@ bool IsReference(IR::Inst& inst) {
return inst.GetOpcode() == IR::Opcode::Reference;
}
void Precolor(EmitContext& ctx, const IR::Program& program) {
void PrecolorInst(IR::Inst& phi) {
// Insert phi moves before references to avoid overwritting other phis
const size_t num_args{phi.NumArgs()};
for (size_t i = 0; i < num_args; ++i) {
IR::Block& phi_block{*phi.PhiBlock(i)};
auto it{std::find_if_not(phi_block.rbegin(), phi_block.rend(), IsReference).base()};
IR::IREmitter ir{phi_block, it};
const IR::Value arg{phi.Arg(i)};
if (arg.IsImmediate()) {
ir.PhiMove(phi, arg);
} else {
ir.PhiMove(phi, IR::Value{&RegAlloc::AliasInst(*arg.Inst())});
}
}
for (size_t i = 0; i < num_args; ++i) {
IR::IREmitter{*phi.PhiBlock(i)}.Reference(IR::Value{&phi});
}
}
void Precolor(const IR::Program& program) {
for (IR::Block* const block : program.blocks) {
for (IR::Inst& phi : block->Instructions() | std::views::take_while(IR::IsPhi)) {
switch (phi.Arg(0).Type()) {
case IR::Type::U1:
case IR::Type::U32:
case IR::Type::F32:
ctx.reg_alloc.Define(phi);
break;
case IR::Type::U64:
case IR::Type::F64:
ctx.reg_alloc.LongDefine(phi);
break;
default:
throw NotImplementedException("Phi node type {}", phi.Type());
}
// Insert phi moves before references to avoid overwritting them
const size_t num_args{phi.NumArgs()};
for (size_t i = 0; i < num_args; ++i) {
IR::Block& phi_block{*phi.PhiBlock(i)};
auto it{std::find_if_not(phi_block.rbegin(), phi_block.rend(), IsReference).base()};
IR::IREmitter ir{phi_block, it};
const IR::Value arg{phi.Arg(i)};
if (arg.IsImmediate()) {
ir.PhiMove(phi, arg);
} else {
ir.PhiMove(phi, IR::Value{&RegAlloc::AliasInst(*arg.Inst())});
}
}
for (size_t i = 0; i < num_args; ++i) {
IR::IREmitter{*phi.PhiBlock(i)}.Reference(IR::Value{&phi});
}
PrecolorInst(phi);
}
}
}
@ -388,7 +379,7 @@ std::string_view GetTessSpacing(TessSpacing spacing) {
std::string EmitGLASM(const Profile& profile, const RuntimeInfo& runtime_info, IR::Program& program,
Bindings& bindings) {
EmitContext ctx{program, bindings, profile, runtime_info};
Precolor(ctx, program);
Precolor(program);
EmitCode(ctx, program);
std::string header{StageHeader(program.stage)};
SetupOptions(program, profile, runtime_info, header);