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shader_ir: Implement immediate register tracking
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@ -7,6 +7,7 @@
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#include <array>
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#include <cstring>
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#include <map>
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#include <optional>
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#include <set>
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#include <string>
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#include <tuple>
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@ -773,6 +774,8 @@ private:
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Node TrackCbuf(Node tracked, const NodeBlock& code, s64 cursor);
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std::optional<u32> TrackImmediate(Node tracked, const NodeBlock& code, s64 cursor);
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std::pair<Node, s64> TrackRegister(const GprNode* tracked, const NodeBlock& code, s64 cursor);
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template <typename... T>
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@ -6,6 +6,7 @@
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#include <utility>
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#include <variant>
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#include "common/common_types.h"
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#include "video_core/shader/shader_ir.h"
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namespace VideoCommon::Shader {
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@ -14,7 +15,7 @@ namespace {
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std::pair<Node, s64> FindOperation(const NodeBlock& code, s64 cursor,
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OperationCode operation_code) {
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for (; cursor >= 0; --cursor) {
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const Node node = code[cursor];
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const Node node = code.at(cursor);
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if (const auto operation = std::get_if<OperationNode>(node)) {
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if (operation->GetCode() == operation_code)
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return {node, cursor};
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@ -64,6 +65,20 @@ Node ShaderIR::TrackCbuf(Node tracked, const NodeBlock& code, s64 cursor) {
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return nullptr;
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}
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std::optional<u32> ShaderIR::TrackImmediate(Node tracked, const NodeBlock& code, s64 cursor) {
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// Reduce the cursor in one to avoid infinite loops when the instruction sets the same register
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// that it uses as operand
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const auto [found, found_cursor] =
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TrackRegister(&std::get<GprNode>(*tracked), code, cursor - 1);
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if (!found) {
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return {};
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}
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if (const auto immediate = std::get_if<ImmediateNode>(found)) {
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return immediate->GetValue();
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}
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return {};
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}
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std::pair<Node, s64> ShaderIR::TrackRegister(const GprNode* tracked, const NodeBlock& code,
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s64 cursor) {
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for (; cursor >= 0; --cursor) {
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