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glasm: Initial implementation of phi nodes on GLASM

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This commit is contained in:
ReinUsesLisp 2021-05-14 04:48:46 -03:00 • committed by ameerj
parent 0f88fb5d72
commit bf5e48ffe4
12 changed files with 117 additions and 25 deletions
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59
src/shader_recompiler/backend/glasm/emit_glasm.cpp
View file

@ -2,6 +2,7 @@
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <ranges>
#include <string>
#include <tuple>
@ -9,6 +10,7 @@
#include "shader_recompiler/backend/glasm/emit_context.h"
#include "shader_recompiler/backend/glasm/emit_glasm.h"
#include "shader_recompiler/backend/glasm/emit_glasm_instructions.h"
#include "shader_recompiler/frontend/ir/ir_emitter.h"
#include "shader_recompiler/frontend/ir/program.h"
#include "shader_recompiler/profile.h"
@ -175,6 +177,34 @@ void EmitInst(EmitContext& ctx, IR::Inst* inst) {
throw LogicError("Invalid opcode {}", inst->GetOpcode());
}
void Precolor(EmitContext& ctx, 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());
}
const size_t num_args{phi.NumArgs()};
for (size_t i = 0; i < num_args; ++i) {
IR::IREmitter{*phi.PhiBlock(i)}.PhiMove(phi, phi.Arg(i));
}
// Add reference to the phi node on the phi predecessor to avoid overwritting it
for (size_t i = 0; i < num_args; ++i) {
IR::IREmitter{*phi.PhiBlock(i)}.DummyReference(IR::Value{&phi});
}
}
}
}
void EmitCode(EmitContext& ctx, const IR::Program& program) {
const auto eval{
[&](const IR::U1& cond) { return ScalarS32{ctx.reg_alloc.Consume(IR::Value{cond})}; }};
@ -186,7 +216,9 @@ void EmitCode(EmitContext& ctx, const IR::Program& program) {
}
break;
case IR::AbstractSyntaxNode::Type::If:
ctx.Add("MOV.S.CC RC,{};IF NE.x;", eval(node.if_node.cond));
ctx.Add("MOV.S.CC RC,{};"
"IF NE.x;",
eval(node.if_node.cond));
break;
case IR::AbstractSyntaxNode::Type::EndIf:
ctx.Add("ENDIF;");
@ -195,10 +227,30 @@ void EmitCode(EmitContext& ctx, const IR::Program& program) {
ctx.Add("REP;");
break;
case IR::AbstractSyntaxNode::Type::Repeat:
ctx.Add("MOV.S.CC RC,{};BRK NE.x;ENDREP;", eval(node.repeat.cond));
if (node.repeat.cond.IsImmediate()) {
if (node.repeat.cond.U1()) {
ctx.Add("ENDREP;");
} else {
ctx.Add("BRK;"
"ENDREP;");
}
} else {
ctx.Add("MOV.S.CC RC,{};"
"BRK (EQ.x);"
"ENDREP;",
eval(node.repeat.cond));
}
break;
case IR::AbstractSyntaxNode::Type::Break:
ctx.Add("MOV.S.CC RC,{};BRK NE.x;", eval(node.repeat.cond));
if (node.break_node.cond.IsImmediate()) {
if (node.break_node.cond.U1()) {
ctx.Add("BRK;");
}
} else {
ctx.Add("MOV.S.CC RC,{};"
"BRK (NE.x);",
eval(node.break_node.cond));
}
break;
case IR::AbstractSyntaxNode::Type::Return:
case IR::AbstractSyntaxNode::Type::Unreachable:
@ -233,6 +285,7 @@ void SetupOptions(std::string& header, Info info) {
std::string EmitGLASM(const Profile&, IR::Program& program, Bindings&) {
EmitContext ctx{program};
Precolor(ctx, program);
EmitCode(ctx, program);
std::string header = "!!NVcp5.0\n"
"OPTION NV_internal;";

3
src/shader_recompiler/backend/glasm/emit_glasm_instructions.h
View file

@ -22,7 +22,8 @@ class EmitContext;
void EmitPhi(EmitContext& ctx, IR::Inst& inst);
void EmitVoid(EmitContext& ctx);
void EmitIdentity(EmitContext& ctx, IR::Inst& inst, const IR::Value& value);
void EmitBranchConditionRef(EmitContext&);
void EmitDummyReference(EmitContext&);
void EmitPhiMove(EmitContext& ctx, const IR::Value& phi, const IR::Value& value);
void EmitJoin(EmitContext& ctx);
void EmitDemoteToHelperInvocation(EmitContext& ctx);
void EmitBarrier(EmitContext& ctx);

27
src/shader_recompiler/backend/glasm/emit_glasm_not_implemented.cpp
View file

@ -17,13 +17,32 @@ namespace Shader::Backend::GLASM {
#define NotImplemented() throw NotImplementedException("GLASM instruction {}", __LINE__)
void EmitPhi(EmitContext& ctx, IR::Inst& inst) {
NotImplemented();
}
void EmitPhi(EmitContext&, IR::Inst&) {}
void EmitVoid(EmitContext&) {}
void EmitBranchConditionRef(EmitContext&) {}
void EmitDummyReference(EmitContext&) {}
void EmitPhiMove(EmitContext& ctx, const IR::Value& phi, const IR::Value& value) {
if (phi == value) {
return;
}
const Register phi_reg{ctx.reg_alloc.Consume(phi)};
const Value eval_value{ctx.reg_alloc.Consume(value)};
switch (phi.InstRecursive()->Arg(0).Type()) {
case IR::Type::U1:
case IR::Type::U32:
case IR::Type::F32:
ctx.Add("MOV.S {}.x,{};", phi_reg, ScalarS32{eval_value});
break;
case IR::Type::U64:
case IR::Type::F64:
ctx.Add("MOV.U64 {}.x,{};", phi_reg, ScalarRegister{eval_value});
break;
default:
throw NotImplementedException("Phi node type {}", phi.Type());
}
}
void EmitJoin(EmitContext& ctx) {
NotImplemented();