1 files changed, 126 insertions, 0 deletions
diff --git a/src/shader_recompiler/frontend/maxwell/translate/impl/integer_to_integer_conversion.cpp b/src/shader_recompiler/frontend/maxwell/translate/impl/integer_to_integer_conversion.cpp
new file mode 100644
index 000000000..53e8d8923
--- /dev/null
+++ b/src/shader_recompiler/frontend/maxwell/translate/impl/integer_to_integer_conversion.cpp
@@ -0,0 +1,126 @@
+// 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 {
+enum class IntegerWidth : u64 {
+    Byte,
+    Short,
+    Word,
+};
+
+[[nodiscard]] IR::U32 WidthSize(IR::IREmitter& ir, IntegerWidth width) {
+    switch (width) {
+    case IntegerWidth::Byte:
+        return ir.Imm32(8);
+    case IntegerWidth::Short:
+        return ir.Imm32(16);
+    case IntegerWidth::Word:
+        return ir.Imm32(32);
+    default:
+        throw NotImplementedException("Invalid width {}", width);
+    }
+}
+
+[[nodiscard]] IR::U32 ConvertInteger(IR::IREmitter& ir, const IR::U32& src,
+                                     IntegerWidth dst_width) {
+    const IR::U32 zero{ir.Imm32(0)};
+    const IR::U32 count{WidthSize(ir, dst_width)};
+    return ir.BitFieldExtract(src, zero, count, false);
+}
+
+[[nodiscard]] IR::U32 SaturateInteger(IR::IREmitter& ir, const IR::U32& src, IntegerWidth dst_width,
+                                      bool dst_signed, bool src_signed) {
+    IR::U32 min{};
+    IR::U32 max{};
+    const IR::U32 zero{ir.Imm32(0)};
+    switch (dst_width) {
+    case IntegerWidth::Byte:
+        min = dst_signed && src_signed ? ir.Imm32(0xffffff80) : zero;
+        max = dst_signed ? ir.Imm32(0x7f) : ir.Imm32(0xff);
+        break;
+    case IntegerWidth::Short:
+        min = dst_signed && src_signed ? ir.Imm32(0xffff8000) : zero;
+        max = dst_signed ? ir.Imm32(0x7fff) : ir.Imm32(0xffff);
+        break;
+    case IntegerWidth::Word:
+        min = dst_signed && src_signed ? ir.Imm32(0x80000000) : zero;
+        max = dst_signed ? ir.Imm32(0x7fffffff) : ir.Imm32(0xffffffff);
+        break;
+    default:
+        throw NotImplementedException("Invalid width {}", dst_width);
+    }
+    const IR::U32 value{!dst_signed && src_signed ? ir.SMax(zero, src) : src};
+    return dst_signed && src_signed ? ir.SClamp(value, min, max) : ir.UClamp(value, min, max);
+}
+
+void I2I(TranslatorVisitor& v, u64 insn, const IR::U32& src_a) {
+    union {
+        u64 insn;
+        BitField<0, 8, IR::Reg> dest_reg;
+        BitField<8, 2, IntegerWidth> dst_fmt;
+        BitField<12, 1, u64> dst_fmt_sign;
+        BitField<10, 2, IntegerWidth> src_fmt;
+        BitField<13, 1, u64> src_fmt_sign;
+        BitField<41, 3, u64> selector;
+        BitField<45, 1, u64> neg;
+        BitField<47, 1, u64> cc;
+        BitField<49, 1, u64> abs;
+        BitField<50, 1, u64> sat;
+    } const i2i{insn};
+
+    if (i2i.src_fmt == IntegerWidth::Short && (i2i.selector == 1 || i2i.selector == 3)) {
+        throw NotImplementedException("16-bit source format incompatible with selector {}",
+                                      i2i.selector);
+    }
+    if (i2i.src_fmt == IntegerWidth::Word && i2i.selector != 0) {
+        throw NotImplementedException("32-bit source format incompatible with selector {}",
+                                      i2i.selector);
+    }
+
+    const s32 selector{static_cast<s32>(i2i.selector)};
+    const IR::U32 offset{v.ir.Imm32(selector * 8)};
+    const IR::U32 count{WidthSize(v.ir, i2i.src_fmt)};
+    const bool src_signed{i2i.src_fmt_sign != 0};
+    const bool dst_signed{i2i.dst_fmt_sign != 0};
+    const bool sat{i2i.sat != 0};
+
+    IR::U32 src_values{v.ir.BitFieldExtract(src_a, offset, count, src_signed)};
+    if (i2i.abs != 0) {
+        src_values = v.ir.IAbs(src_values);
+    }
+    if (i2i.neg != 0) {
+        src_values = v.ir.INeg(src_values);
+    }
+    const IR::U32 result{
+        sat ? SaturateInteger(v.ir, src_values, i2i.dst_fmt, dst_signed, src_signed)
+            : ConvertInteger(v.ir, src_values, i2i.dst_fmt)};
+
+    v.X(i2i.dest_reg, result);
+    if (i2i.cc != 0) {
+        v.SetZFlag(v.ir.GetZeroFromOp(result));
+        v.SetSFlag(v.ir.GetSignFromOp(result));
+        v.ResetCFlag();
+        v.ResetOFlag();
+    }
+}
+} // Anonymous namespace
+
+void TranslatorVisitor::I2I_reg(u64 insn) {
+    I2I(*this, insn, GetReg20(insn));
+}
+
+void TranslatorVisitor::I2I_cbuf(u64 insn) {
+    I2I(*this, insn, GetCbuf(insn));
+}
+
+void TranslatorVisitor::I2I_imm(u64 insn) {
+    I2I(*this, insn, GetImm20(insn));
+}
+
+} // namespace Shader::Maxwell