2 files changed, 14 insertions, 4 deletions

diff --git a/src/shader_recompiler/frontend/maxwell/translate/impl/load_constant.cpp b/src/shader_recompiler/frontend/maxwell/translate/impl/load_constant.cpp
index 2300088e3..8007a4d46 100644
--- a/src/shader_recompiler/frontend/maxwell/translate/impl/load_constant.cpp
+++ b/src/shader_recompiler/frontend/maxwell/translate/impl/load_constant.cpp
@@ -11,10 +11,20 @@ namespace Shader::Maxwell {
 using namespace LDC;
 namespace {
 std::pair<IR::U32, IR::U32> Slot(IR::IREmitter& ir, Mode mode, const IR::U32& imm_index,
-                                 const IR::U32& reg, const IR::U32& imm) {
+                                 const IR::U32& reg, const IR::U32& imm_offset) {
     switch (mode) {
     case Mode::Default:
-        return {imm_index, ir.IAdd(reg, imm)};
+        return {imm_index, ir.IAdd(reg, imm_offset)};
+    case Mode::IS: {
+        // Segmented addressing mode
+        // Ra+imm_offset points into a flat mapping of const buffer
+        // address space
+        const IR::U32 address{ir.IAdd(reg, imm_offset)};
+        const IR::U32 index{ir.BitFieldExtract(address, ir.Imm32(16), ir.Imm32(16))};
+        const IR::U32 offset{ir.BitFieldExtract(address, ir.Imm32(0), ir.Imm32(16))};
+
+        return {ir.IAdd(index, imm_index), offset};
+    }
     default:
         break;
     }
diff --git a/src/shader_recompiler/frontend/maxwell/translate_program.cpp b/src/shader_recompiler/frontend/maxwell/translate_program.cpp
index 248ad3ced..b22725584 100644
--- a/src/shader_recompiler/frontend/maxwell/translate_program.cpp
+++ b/src/shader_recompiler/frontend/maxwell/translate_program.cpp
@@ -212,11 +212,11 @@ IR::Program TranslateProgram(ObjectPool<IR::Inst>& inst_pool, ObjectPool<IR::Blo
     }
     Optimization::SsaRewritePass(program);
 
+    Optimization::ConstantPropagationPass(program);
+
     Optimization::GlobalMemoryToStorageBufferPass(program);
     Optimization::TexturePass(env, program);
 
-    Optimization::ConstantPropagationPass(program);
-
     if (Settings::values.resolution_info.active) {
         Optimization::RescalingPass(program);
     }