1 files changed, 86 insertions, 0 deletions
diff --git a/src/shader_recompiler/frontend/maxwell/translate/impl/integer_scaled_add.cpp b/src/shader_recompiler/frontend/maxwell/translate/impl/integer_scaled_add.cpp
new file mode 100644
index 000000000..044671943
--- /dev/null
+++ b/src/shader_recompiler/frontend/maxwell/translate/impl/integer_scaled_add.cpp
@@ -0,0 +1,86 @@
+// 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 ISCADD(TranslatorVisitor& v, u64 insn, IR::U32 op_b, bool cc, bool neg_a, bool neg_b,
+            u64 scale_imm) {
+    union {
+        u64 raw;
+        BitField<0, 8, IR::Reg> dest_reg;
+        BitField<8, 8, IR::Reg> op_a;
+    } const iscadd{insn};
+
+    const bool po{neg_a && neg_b};
+    IR::U32 op_a{v.X(iscadd.op_a)};
+    if (po) {
+        // When PO is present, add one
+        op_b = v.ir.IAdd(op_b, v.ir.Imm32(1));
+    } else {
+        // When PO is not present, the bits are interpreted as negation
+        if (neg_a) {
+            op_a = v.ir.INeg(op_a);
+        }
+        if (neg_b) {
+            op_b = v.ir.INeg(op_b);
+        }
+    }
+    // With the operands already processed, scale A
+    const IR::U32 scale{v.ir.Imm32(static_cast<u32>(scale_imm))};
+    const IR::U32 scaled_a{v.ir.ShiftLeftLogical(op_a, scale)};
+
+    const IR::U32 result{v.ir.IAdd(scaled_a, op_b)};
+    v.X(iscadd.dest_reg, result);
+
+    if (cc) {
+        v.SetZFlag(v.ir.GetZeroFromOp(result));
+        v.SetSFlag(v.ir.GetSignFromOp(result));
+        const IR::U1 carry{v.ir.GetCarryFromOp(result)};
+        const IR::U1 overflow{v.ir.GetOverflowFromOp(result)};
+        v.SetCFlag(po ? v.ir.LogicalOr(carry, v.ir.GetCarryFromOp(op_b)) : carry);
+        v.SetOFlag(po ? v.ir.LogicalOr(overflow, v.ir.GetOverflowFromOp(op_b)) : overflow);
+    }
+}
+
+void ISCADD(TranslatorVisitor& v, u64 insn, IR::U32 op_b) {
+    union {
+        u64 raw;
+        BitField<47, 1, u64> cc;
+        BitField<48, 1, u64> neg_b;
+        BitField<49, 1, u64> neg_a;
+        BitField<39, 5, u64> scale;
+    } const iscadd{insn};
+
+    ISCADD(v, insn, op_b, iscadd.cc != 0, iscadd.neg_a != 0, iscadd.neg_b != 0, iscadd.scale);
+}
+
+} // Anonymous namespace
+
+void TranslatorVisitor::ISCADD_reg(u64 insn) {
+    ISCADD(*this, insn, GetReg20(insn));
+}
+
+void TranslatorVisitor::ISCADD_cbuf(u64 insn) {
+    ISCADD(*this, insn, GetCbuf(insn));
+}
+
+void TranslatorVisitor::ISCADD_imm(u64 insn) {
+    ISCADD(*this, insn, GetImm20(insn));
+}
+
+void TranslatorVisitor::ISCADD32I(u64 insn) {
+    union {
+        u64 raw;
+        BitField<52, 1, u64> cc;
+        BitField<53, 5, u64> scale;
+    } const iscadd{insn};
+
+    return ISCADD(*this, insn, GetImm32(insn), iscadd.cc != 0, false, false, iscadd.scale);
+}
+
+} // namespace Shader::Maxwell