From c7c518e280d1ac04adb08d45145690fd06ac7b18 Mon Sep 17 00:00:00 2001
From: FernandoS27 <fsahmkow27@gmail.com>
Date: Wed, 24 Mar 2021 23:41:55 +0100
Subject: shader: Implement TLD4 and TLD4_B
---
src/shader_recompiler/ir_opt/constant_propagation_pass.cpp | 12 ++++++++++++
1 file changed, 12 insertions(+)
(limited to 'src/shader_recompiler/ir_opt/constant_propagation_pass.cpp')
diff --git a/src/shader_recompiler/ir_opt/constant_propagation_pass.cpp b/src/shader_recompiler/ir_opt/constant_propagation_pass.cpp
index 3dab424f60..28060dccfa 100644
--- a/src/shader_recompiler/ir_opt/constant_propagation_pass.cpp
+++ b/src/shader_recompiler/ir_opt/constant_propagation_pass.cpp
@@ -403,6 +403,18 @@ void ConstantPropagation(IR::Block& block, IR::Inst& inst) {
return (base >> shift) & ((1U << count) - 1);
});
return;
+ case IR::Opcode::BitFieldSExtract:
+ FoldWhenAllImmediates(inst, [](s32 base, u32 shift, u32 count) {
+ const size_t back_shift = static_cast<size_t>(shift) + static_cast<size_t>(count);
+ if (back_shift > Common::BitSize<s32>()) {
+ throw LogicError("Undefined result in {}({}, {}, {})", IR::Opcode::BitFieldSExtract,
+ base, shift, count);
+ }
+ const size_t left_shift = Common::BitSize<s32>() - back_shift;
+ return static_cast<u32>(static_cast<s32>(base << left_shift) >>
+ static_cast<size_t>(Common::BitSize<s32>() - count));
+ });
+ return;
case IR::Opcode::BranchConditional:
return FoldBranchConditional(inst);
default:
--
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