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glsl: Fix "reg" allocing

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based on glasm with some tweaks
This commit is contained in:
ameerj 2021-05-20 23:38:38 -04:00
parent eaff1030de
commit 64337f004d
10 changed files with 938 additions and 898 deletions
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37
src/shader_recompiler/backend/glsl/reg_alloc.cpp
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@ -10,7 +10,7 @@
#include "shader_recompiler/backend/glsl/reg_alloc.h"
#include "shader_recompiler/exception.h"
#include "shader_recompiler/frontend/ir/value.h"
#pragma optimize("", off)
namespace Shader::Backend::GLSL {
namespace {
constexpr std::string_view SWIZZLE = "xyzw";
@ -24,11 +24,7 @@ std::string Representation(Id id) {
}
const u32 num_elements{id.num_elements_minus_one + 1};
const u32 index{static_cast<u32>(id.index)};
if (num_elements == 4) {
return fmt::format("R{}", index);
} else {
return fmt::format("R{}.{}", index, SWIZZLE.substr(id.base_element, num_elements));
}
return fmt::format("R{}", index);
}
std::string MakeImm(const IR::Value& value) {
@ -56,7 +52,8 @@ std::string RegAlloc::Define(IR::Inst& inst, u32 num_elements, u32 alignment) {
}
std::string RegAlloc::Consume(const IR::Value& value) {
return value.IsImmediate() ? MakeImm(value) : Consume(*value.Inst());
const auto result = value.IsImmediate() ? MakeImm(value) : Consume(*value.InstRecursive());
return result;
}
std::string RegAlloc::Consume(IR::Inst& inst) {
@ -93,4 +90,30 @@ void RegAlloc::Free(Id id) {
register_use[id.index] = false;
}
/*static*/ bool RegAlloc::IsAliased(const IR::Inst& inst) {
switch (inst.GetOpcode()) {
case IR::Opcode::Identity:
case IR::Opcode::BitCastU16F16:
case IR::Opcode::BitCastU32F32:
case IR::Opcode::BitCastU64F64:
case IR::Opcode::BitCastF16U16:
case IR::Opcode::BitCastF32U32:
case IR::Opcode::BitCastF64U64:
return true;
default:
return false;
}
}
/*static*/ IR::Inst& RegAlloc::AliasInst(IR::Inst& inst) {
IR::Inst* it{&inst};
while (IsAliased(*it)) {
const IR::Value arg{it->Arg(0)};
if (arg.IsImmediate()) {
break;
}
it = arg.InstRecursive();
}
return *it;
}
} // namespace Shader::Backend::GLSL