shader: Initial instruction support

src/shader_recompiler/frontend/maxwell/translate/impl/integer_add.cpp

@@ -0,0 +1,106 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/bit_field.h"
+#include "common/common_types.h"
+#include "shader_recompiler/frontend/maxwell/translate/impl/impl.h"
+
+namespace Shader::Maxwell {
+namespace {
+void IADD(TranslatorVisitor& v, u64 insn, const IR::U32 op_b, bool neg_a, bool po, bool sat, bool x,
+          bool cc) {
+    union {
+        u64 raw;
+        BitField<0, 8, IR::Reg> dest_reg;
+        BitField<8, 8, IR::Reg> src_a;
+    } const iadd{insn};
+
+    if (sat) {
+        throw NotImplementedException("IADD SAT");
+    }
+    if (x && po) {
+        throw NotImplementedException("IADD X+PO");
+    }
+    // Operand A is always read from here, negated if needed
+    IR::U32 op_a{v.X(iadd.src_a)};
+    if (neg_a) {
+        op_a = v.ir.INeg(op_a);
+    }
+    // Add both operands
+    IR::U32 result{v.ir.IAdd(op_a, op_b)};
+    if (x) {
+        const IR::U32 carry{v.ir.Select(v.ir.GetCFlag(), v.ir.Imm32(1), v.ir.Imm32(0))};
+        result = v.ir.IAdd(result, carry);
+    }
+    if (po) {
+        // .PO adds one to the result
+        result = v.ir.IAdd(result, v.ir.Imm32(1));
+    }
+    if (cc) {
+        // Store flags
+        // TODO: Does this grab the result pre-PO or after?
+        if (po) {
+            throw NotImplementedException("IADD CC+PO");
+        }
+        // TODO: How does CC behave when X is set?
+        if (x) {
+            throw NotImplementedException("IADD X+CC");
+        }
+        v.SetZFlag(v.ir.GetZeroFromOp(result));
+        v.SetSFlag(v.ir.GetSignFromOp(result));
+        v.SetCFlag(v.ir.GetCarryFromOp(result));
+        v.SetOFlag(v.ir.GetOverflowFromOp(result));
+    }
+    // Store result
+    v.X(iadd.dest_reg, result);
+}
+
+void IADD(TranslatorVisitor& v, u64 insn, IR::U32 op_b) {
+    union {
+        u64 insn;
+        BitField<43, 1, u64> x;
+        BitField<47, 1, u64> cc;
+        BitField<48, 2, u64> three_for_po;
+        BitField<48, 1, u64> neg_b;
+        BitField<49, 1, u64> neg_a;
+        BitField<50, 1, u64> sat;
+    } const iadd{insn};
+
+    const bool po{iadd.three_for_po == 3};
+    const bool neg_a{!po && iadd.neg_a != 0};
+    if (!po && iadd.neg_b != 0) {
+        op_b = v.ir.INeg(op_b);
+    }
+    IADD(v, insn, op_b, iadd.neg_a != 0, po, iadd.sat != 0, iadd.x != 0, iadd.cc != 0);
+}
+} // Anonymous namespace
+
+void TranslatorVisitor::IADD_reg(u64) {
+    throw NotImplementedException("IADD (reg)");
+}
+
+void TranslatorVisitor::IADD_cbuf(u64 insn) {
+    IADD(*this, insn, GetCbuf(insn));
+}
+
+void TranslatorVisitor::IADD_imm(u64) {
+    throw NotImplementedException("IADD (imm)");
+}
+
+void TranslatorVisitor::IADD32I(u64 insn) {
+    union {
+        u64 raw;
+        BitField<52, 1, u64> cc;
+        BitField<53, 1, u64> x;
+        BitField<54, 1, u64> sat;
+        BitField<55, 2, u64> three_for_po;
+        BitField<56, 1, u64> neg_a;
+    } const iadd32i{insn};
+
+    const bool po{iadd32i.three_for_po == 3};
+    const bool neg_a{!po && iadd32i.neg_a != 0};
+    IADD(*this, insn, GetImm32(insn), neg_a, po, iadd32i.sat != 0, iadd32i.x != 0, iadd32i.cc != 0);
+}
+
+} // namespace Shader::Maxwell