shader: Implement F2F

4 files changed, 188 insertions, 19 deletions

diff --git a/src/shader_recompiler/frontend/ir/ir_emitter.cpp b/src/shader_recompiler/frontend/ir/ir_emitter.cpp
index 1eda95071..00c909f3e 100644
--- a/src/shader_recompiler/frontend/ir/ir_emitter.cpp
+++ b/src/shader_recompiler/frontend/ir/ir_emitter.cpp
@@ -1361,7 +1361,7 @@ U32U64 IREmitter::UConvert(size_t result_bitsize, const U32U64& value) {
     throw NotImplementedException("Conversion from {} to {} bits", value.Type(), result_bitsize);
 }
 
-F16F32F64 IREmitter::FPConvert(size_t result_bitsize, const F16F32F64& value) {
+F16F32F64 IREmitter::FPConvert(size_t result_bitsize, const F16F32F64& value, FpControl control) {
     switch (result_bitsize) {
     case 16:
         switch (value.Type()) {
@@ -1369,7 +1369,7 @@ F16F32F64 IREmitter::FPConvert(size_t result_bitsize, const F16F32F64& value) {
             // Nothing to do
             return value;
         case Type::F32:
-            return Inst<F16>(Opcode::ConvertF16F32, value);
+            return Inst<F16>(Opcode::ConvertF16F32, Flags{control}, value);
         case Type::F64:
             throw LogicError("Illegal conversion from F64 to F16");
         default:
@@ -1379,12 +1379,12 @@ F16F32F64 IREmitter::FPConvert(size_t result_bitsize, const F16F32F64& value) {
     case 32:
         switch (value.Type()) {
         case Type::F16:
-            return Inst<F32>(Opcode::ConvertF32F16, value);
+            return Inst<F32>(Opcode::ConvertF32F16, Flags{control}, value);
         case Type::F32:
             // Nothing to do
             return value;
         case Type::F64:
-            return Inst<F64>(Opcode::ConvertF32F64, value);
+            return Inst<F32>(Opcode::ConvertF32F64, Flags{control}, value);
         default:
             break;
         }
@@ -1394,10 +1394,10 @@ F16F32F64 IREmitter::FPConvert(size_t result_bitsize, const F16F32F64& value) {
         case Type::F16:
             throw LogicError("Illegal conversion from F16 to F64");
         case Type::F32:
+            return Inst<F64>(Opcode::ConvertF64F32, Flags{control}, value);
+        case Type::F64:
             // Nothing to do
             return value;
-        case Type::F64:
-            return Inst<F64>(Opcode::ConvertF32F64, value);
         default:
             break;
         }
diff --git a/src/shader_recompiler/frontend/ir/ir_emitter.h b/src/shader_recompiler/frontend/ir/ir_emitter.h
index ab4537d88..346cef3ab 100644
--- a/src/shader_recompiler/frontend/ir/ir_emitter.h
+++ b/src/shader_recompiler/frontend/ir/ir_emitter.h
@@ -216,7 +216,8 @@ public:
                                         const Value& value);
 
     [[nodiscard]] U32U64 UConvert(size_t result_bitsize, const U32U64& value);
-    [[nodiscard]] F16F32F64 FPConvert(size_t result_bitsize, const F16F32F64& value);
+    [[nodiscard]] F16F32F64 FPConvert(size_t result_bitsize, const F16F32F64& value,
+                                      FpControl control = {});
 
     [[nodiscard]] Value ImageSampleImplicitLod(const Value& handle, const Value& coords,
                                                const F32& bias, const Value& offset,
diff --git a/src/shader_recompiler/frontend/maxwell/translate/impl/floating_point_conversion_floating_point.cpp b/src/shader_recompiler/frontend/maxwell/translate/impl/floating_point_conversion_floating_point.cpp
new file mode 100644
index 000000000..1e366fde0
--- /dev/null
+++ b/src/shader_recompiler/frontend/maxwell/translate/impl/floating_point_conversion_floating_point.cpp
@@ -0,0 +1,180 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "shader_recompiler/frontend/maxwell/translate/impl/common_encoding.h"
+#include "shader_recompiler/frontend/maxwell/translate/impl/half_floating_point_helper.h"
+
+namespace Shader::Maxwell {
+namespace {
+enum class FloatFormat : u64 {
+    F16 = 1,
+    F32 = 2,
+    F64 = 3,
+};
+
+enum class RoundingOp : u64 {
+    None = 0,
+    Pass = 3,
+    Round = 8,
+    Floor = 9,
+    Ceil = 10,
+    Trunc = 11,
+};
+
+[[nodiscard]] u32 WidthSize(FloatFormat width) {
+    switch (width) {
+    case FloatFormat::F16:
+        return 16;
+    case FloatFormat::F32:
+        return 32;
+    case FloatFormat::F64:
+        return 64;
+    default:
+        throw NotImplementedException("Invalid width {}", width);
+    }
+}
+
+void F2F(TranslatorVisitor& v, u64 insn, const IR::F16F32F64& src_a, bool abs) {
+    union {
+        u64 insn;
+        BitField<0, 8, IR::Reg> dest_reg;
+        BitField<44, 1, u64> ftz;
+        BitField<45, 1, u64> neg;
+        BitField<50, 1, u64> sat;
+        BitField<39, 4, u64> rounding_op;
+        BitField<39, 2, FpRounding> rounding;
+        BitField<10, 2, FloatFormat> src_size;
+        BitField<8, 2, FloatFormat> dst_size;
+
+        [[nodiscard]] RoundingOp RoundingOperation() const {
+            constexpr u64 rounding_mask = 0x0B;
+            return static_cast<RoundingOp>(rounding_op.Value() & rounding_mask);
+        }
+    } const f2f{insn};
+
+    IR::F16F32F64 input{v.ir.FPAbsNeg(src_a, abs, f2f.neg != 0)};
+
+    const bool any_fp64{f2f.src_size == FloatFormat::F64 || f2f.dst_size == FloatFormat::F64};
+    IR::FpControl fp_control{
+        .no_contraction{false},
+        .rounding{IR::FpRounding::DontCare},
+        .fmz_mode{f2f.ftz != 0 && !any_fp64 ? IR::FmzMode::FTZ : IR::FmzMode::None},
+    };
+    if (f2f.src_size != f2f.dst_size) {
+        fp_control.rounding = CastFpRounding(f2f.rounding);
+        input = v.ir.FPConvert(WidthSize(f2f.dst_size), input, fp_control);
+    } else {
+        switch (f2f.RoundingOperation()) {
+        case RoundingOp::None:
+        case RoundingOp::Pass:
+            // Make sure NANs are handled properly
+            switch (f2f.src_size) {
+            case FloatFormat::F16:
+                input = v.ir.FPAdd(input, v.ir.FPConvert(16, v.ir.Imm32(0.0f)), fp_control);
+                break;
+            case FloatFormat::F32:
+                input = v.ir.FPAdd(input, v.ir.Imm32(0.0f), fp_control);
+                break;
+            case FloatFormat::F64:
+                input = v.ir.FPAdd(input, v.ir.Imm64(0.0), fp_control);
+                break;
+            }
+            break;
+        case RoundingOp::Round:
+            input = v.ir.FPRoundEven(input, fp_control);
+            break;
+        case RoundingOp::Floor:
+            input = v.ir.FPFloor(input, fp_control);
+            break;
+        case RoundingOp::Ceil:
+            input = v.ir.FPCeil(input, fp_control);
+            break;
+        case RoundingOp::Trunc:
+            input = v.ir.FPTrunc(input, fp_control);
+            break;
+        default:
+            throw NotImplementedException("Unimplemented rounding mode {}", f2f.rounding.Value());
+        }
+    }
+    if (f2f.sat != 0 && !any_fp64) {
+        input = v.ir.FPSaturate(input);
+    }
+
+    switch (f2f.dst_size) {
+    case FloatFormat::F16: {
+        const IR::F16 imm{v.ir.FPConvert(16, v.ir.Imm32(0.0f))};
+        v.X(f2f.dest_reg, v.ir.PackFloat2x16(v.ir.CompositeConstruct(input, imm)));
+        break;
+    }
+    case FloatFormat::F32:
+        v.F(f2f.dest_reg, input);
+        break;
+    case FloatFormat::F64:
+        v.D(f2f.dest_reg, input);
+        break;
+    default:
+        throw NotImplementedException("Invalid dest format {}", f2f.dst_size.Value());
+    }
+}
+} // Anonymous namespace
+
+void TranslatorVisitor::F2F_reg(u64 insn) {
+    union {
+        u64 insn;
+        BitField<49, 1, u64> abs;
+        BitField<10, 2, FloatFormat> src_size;
+        BitField<41, 1, u64> selector;
+    } const f2f{insn};
+
+    IR::F16F32F64 src_a;
+    switch (f2f.src_size) {
+    case FloatFormat::F16: {
+        auto [lhs_a, rhs_a]{Extract(ir, GetReg20(insn), Swizzle::H1_H0)};
+        src_a = f2f.selector != 0 ? rhs_a : lhs_a;
+        break;
+    }
+    case FloatFormat::F32:
+        src_a = GetFloatReg20(insn);
+        break;
+    case FloatFormat::F64:
+        src_a = GetDoubleReg20(insn);
+        break;
+    default:
+        throw NotImplementedException("Invalid dest format {}", f2f.src_size.Value());
+    }
+    F2F(*this, insn, src_a, f2f.abs != 0);
+}
+
+void TranslatorVisitor::F2F_cbuf(u64 insn) {
+    union {
+        u64 insn;
+        BitField<49, 1, u64> abs;
+        BitField<10, 2, FloatFormat> src_size;
+        BitField<41, 1, u64> selector;
+    } const f2f{insn};
+
+    IR::F16F32F64 src_a;
+    switch (f2f.src_size) {
+    case FloatFormat::F16: {
+        auto [lhs_a, rhs_a]{Extract(ir, GetCbuf(insn), Swizzle::H1_H0)};
+        src_a = f2f.selector != 0 ? rhs_a : lhs_a;
+        break;
+    }
+    case FloatFormat::F32:
+        src_a = GetFloatCbuf(insn);
+        break;
+    case FloatFormat::F64:
+        src_a = GetDoubleCbuf(insn);
+        break;
+    default:
+        throw NotImplementedException("Invalid dest format {}", f2f.src_size.Value());
+    }
+    F2F(*this, insn, src_a, f2f.abs != 0);
+}
+
+void TranslatorVisitor::F2F_imm([[maybe_unused]] u64 insn) {
+    throw NotImplementedException("Instruction");
+}
+
+} // namespace Shader::Maxwell
diff --git a/src/shader_recompiler/frontend/maxwell/translate/impl/not_implemented.cpp b/src/shader_recompiler/frontend/maxwell/translate/impl/not_implemented.cpp
index 4e069912a..08f6eb788 100644
--- a/src/shader_recompiler/frontend/maxwell/translate/impl/not_implemented.cpp
+++ b/src/shader_recompiler/frontend/maxwell/translate/impl/not_implemented.cpp
@@ -117,18 +117,6 @@ void TranslatorVisitor::DSETP_imm(u64) {
     ThrowNotImplemented(Opcode::DSETP_imm);
 }
 
-void TranslatorVisitor::F2F_reg(u64) {
-    ThrowNotImplemented(Opcode::F2F_reg);
-}
-
-void TranslatorVisitor::F2F_cbuf(u64) {
-    ThrowNotImplemented(Opcode::F2F_cbuf);
-}
-
-void TranslatorVisitor::F2F_imm(u64) {
-    ThrowNotImplemented(Opcode::F2F_imm);
-}
-
 void TranslatorVisitor::FCHK_reg(u64) {
     ThrowNotImplemented(Opcode::FCHK_reg);
 }