Merge pull request #6585 from ameerj/hades

Shader Decompiler Rewrite

1 files changed, 47 insertions, 0 deletions

diff --git a/src/shader_recompiler/frontend/maxwell/translate/impl/find_leading_one.cpp b/src/shader_recompiler/frontend/maxwell/translate/impl/find_leading_one.cpp
new file mode 100644
index 000000000..f0cb25d61
--- /dev/null
+++ b/src/shader_recompiler/frontend/maxwell/translate/impl/find_leading_one.cpp
@@ -0,0 +1,47 @@
+// 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 FLO(TranslatorVisitor& v, u64 insn, IR::U32 src) {
+    union {
+        u64 insn;
+        BitField<0, 8, IR::Reg> dest_reg;
+        BitField<40, 1, u64> tilde;
+        BitField<41, 1, u64> shift;
+        BitField<47, 1, u64> cc;
+        BitField<48, 1, u64> is_signed;
+    } const flo{insn};
+
+    if (flo.cc != 0) {
+        throw NotImplementedException("CC");
+    }
+    if (flo.tilde != 0) {
+        src = v.ir.BitwiseNot(src);
+    }
+    IR::U32 result{flo.is_signed != 0 ? v.ir.FindSMsb(src) : v.ir.FindUMsb(src)};
+    if (flo.shift != 0) {
+        const IR::U1 not_found{v.ir.IEqual(result, v.ir.Imm32(-1))};
+        result = IR::U32{v.ir.Select(not_found, result, v.ir.BitwiseXor(result, v.ir.Imm32(31)))};
+    }
+    v.X(flo.dest_reg, result);
+}
+} // Anonymous namespace
+
+void TranslatorVisitor::FLO_reg(u64 insn) {
+    FLO(*this, insn, GetReg20(insn));
+}
+
+void TranslatorVisitor::FLO_cbuf(u64 insn) {
+    FLO(*this, insn, GetCbuf(insn));
+}
+
+void TranslatorVisitor::FLO_imm(u64 insn) {
+    FLO(*this, insn, GetImm20(insn));
+}
+} // namespace Shader::Maxwell