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shader: Fold comparisons and Pack/Unpack16
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@ -3,9 +3,9 @@
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// Refer to the license.txt file included.
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#include <algorithm>
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#include <ranges>
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#include <tuple>
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#include <type_traits>
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#include <ranges>
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#include "common/bit_cast.h"
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#include "common/bit_util.h"
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@ -332,6 +332,18 @@ void FoldBitCast(IR::Inst& inst, IR::Opcode reverse) {
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}
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}
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void FoldInverseFunc(IR::Inst& inst, IR::Opcode reverse) {
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const IR::Value value{inst.Arg(0)};
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if (value.IsImmediate()) {
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return;
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}
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IR::Inst* const arg_inst{value.InstRecursive()};
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if (arg_inst->Opcode() == reverse) {
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inst.ReplaceUsesWith(arg_inst->Arg(0));
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return;
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}
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}
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template <typename Func, size_t... I>
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IR::Value EvalImmediates(const IR::Inst& inst, Func&& func, std::index_sequence<I...>) {
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using Traits = LambdaTraits<decltype(func)>;
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@ -372,6 +384,10 @@ void ConstantPropagation(IR::Block& block, IR::Inst& inst) {
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return FoldBitCast<IR::Opcode::BitCastU32F32, u32, f32>(inst, IR::Opcode::BitCastF32U32);
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case IR::Opcode::IAdd64:
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return FoldAdd<u64>(block, inst);
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case IR::Opcode::PackHalf2x16:
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return FoldInverseFunc(inst, IR::Opcode::UnpackHalf2x16);
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case IR::Opcode::UnpackHalf2x16:
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return FoldInverseFunc(inst, IR::Opcode::PackHalf2x16);
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case IR::Opcode::SelectU1:
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case IR::Opcode::SelectU8:
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case IR::Opcode::SelectU16:
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@ -395,6 +411,30 @@ void ConstantPropagation(IR::Block& block, IR::Inst& inst) {
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case IR::Opcode::ULessThan:
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FoldWhenAllImmediates(inst, [](u32 a, u32 b) { return a < b; });
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return;
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case IR::Opcode::SLessThanEqual:
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FoldWhenAllImmediates(inst, [](s32 a, s32 b) { return a <= b; });
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return;
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case IR::Opcode::ULessThanEqual:
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FoldWhenAllImmediates(inst, [](u32 a, u32 b) { return a <= b; });
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return;
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case IR::Opcode::SGreaterThan:
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FoldWhenAllImmediates(inst, [](s32 a, s32 b) { return a > b; });
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return;
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case IR::Opcode::UGreaterThan:
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FoldWhenAllImmediates(inst, [](u32 a, u32 b) { return a > b; });
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return;
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case IR::Opcode::SGreaterThanEqual:
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FoldWhenAllImmediates(inst, [](s32 a, s32 b) { return a >= b; });
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return;
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case IR::Opcode::UGreaterThanEqual:
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FoldWhenAllImmediates(inst, [](u32 a, u32 b) { return a >= b; });
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return;
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case IR::Opcode::IEqual:
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FoldWhenAllImmediates(inst, [](u32 a, u32 b) { return a == b; });
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return;
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case IR::Opcode::INotEqual:
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FoldWhenAllImmediates(inst, [](u32 a, u32 b) { return a != b; });
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return;
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case IR::Opcode::BitFieldUExtract:
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FoldWhenAllImmediates(inst, [](u32 base, u32 shift, u32 count) {
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if (static_cast<size_t>(shift) + static_cast<size_t>(count) > Common::BitSize<u32>()) {
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