3 files changed, 56 insertions, 4 deletions

diff --git a/src/shader_recompiler/CMakeLists.txt b/src/shader_recompiler/CMakeLists.txt
index 7b9f08aa0..8c24c1377 100644
--- a/src/shader_recompiler/CMakeLists.txt
+++ b/src/shader_recompiler/CMakeLists.txt
@@ -120,6 +120,7 @@ add_library(shader_recompiler STATIC
     frontend/maxwell/translate/impl/integer_shift_right.cpp
     frontend/maxwell/translate/impl/integer_short_multiply_add.cpp
     frontend/maxwell/translate/impl/integer_to_integer_conversion.cpp
+    frontend/maxwell/translate/impl/internal_stage_buffer_entry_read.cpp
     frontend/maxwell/translate/impl/load_constant.cpp
     frontend/maxwell/translate/impl/load_constant.h
     frontend/maxwell/translate/impl/load_effective_address.cpp
diff --git a/src/shader_recompiler/frontend/maxwell/translate/impl/internal_stage_buffer_entry_read.cpp b/src/shader_recompiler/frontend/maxwell/translate/impl/internal_stage_buffer_entry_read.cpp
new file mode 100644
index 000000000..8c01b7d30
--- /dev/null
+++ b/src/shader_recompiler/frontend/maxwell/translate/impl/internal_stage_buffer_entry_read.cpp
@@ -0,0 +1,55 @@
+// 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"
+
+#pragma optimize("", off)
+
+namespace Shader::Maxwell {
+namespace {
+enum class Mode : u64 {
+    Default,
+    Patch,
+    Prim,
+    Attr,
+};
+
+enum class Shift : u64 {
+    Default,
+    U16,
+    B32,
+};
+
+} // Anonymous namespace
+
+void TranslatorVisitor::ISBERD(u64 insn) {
+    union {
+        u64 raw;
+        BitField<0, 8, IR::Reg> dest_reg;
+        BitField<8, 8, IR::Reg> src_reg;
+        BitField<31, 1, u64> skew;
+        BitField<32, 1, u64> o;
+        BitField<33, 2, Mode> mode;
+        BitField<47, 2, Shift> shift;
+    } const isberd{insn};
+
+    if (isberd.skew != 0) {
+        throw NotImplementedException("SKEW");
+    }
+    if (isberd.o != 0) {
+        throw NotImplementedException("O");
+    }
+    if (isberd.mode != Mode::Default) {
+        throw NotImplementedException("Mode {}", isberd.mode.Value());
+    }
+    if (isberd.shift != Shift::Default) {
+        throw NotImplementedException("Shift {}", isberd.shift.Value());
+    }
+    // LOG_WARNING(..., "ISBERD is stubbed");
+    X(isberd.dest_reg, X(isberd.src_reg));
+}
+
+} // 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 aebe3072a..694bdfccb 100644
--- a/src/shader_recompiler/frontend/maxwell/translate/impl/not_implemented.cpp
+++ b/src/shader_recompiler/frontend/maxwell/translate/impl/not_implemented.cpp
@@ -141,10 +141,6 @@ void TranslatorVisitor::IMUL32I(u64) {
     ThrowNotImplemented(Opcode::IMUL32I);
 }
 
-void TranslatorVisitor::ISBERD(u64) {
-    ThrowNotImplemented(Opcode::ISBERD);
-}
-
 void TranslatorVisitor::JCAL(u64) {
     ThrowNotImplemented(Opcode::JCAL);
 }