From 501284a81a60a19713aa0509f3db994617f44659 Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Sun, 16 Dec 2018 18:19:17 -0300
Subject: [PATCH] shader_decode: Implement BFE
---
src/video_core/shader/decode/bfe.cpp | 26 +++++++++++++++++++++++++-
1 file changed, 25 insertions(+), 1 deletion(-)
diff --git a/src/video_core/shader/decode/bfe.cpp b/src/video_core/shader/decode/bfe.cpp
index ffd904c54..6532a3bce 100644
--- a/src/video_core/shader/decode/bfe.cpp
+++ b/src/video_core/shader/decode/bfe.cpp
@@ -16,7 +16,31 @@ u32 ShaderIR::DecodeBfe(BasicBlock& bb, u32 pc) {
const Instruction instr = {program_code[pc]};
const auto opcode = OpCode::Decode(instr);
- UNIMPLEMENTED();
+ UNIMPLEMENTED_IF(instr.bfe.negate_b);
+
+ Node op_a = GetRegister(instr.gpr8);
+ op_a = GetOperandAbsNegInteger(op_a, false, instr.bfe.negate_a, false);
+
+ switch (opcode->get().GetId()) {
+ case OpCode::Id::BFE_IMM: {
+ UNIMPLEMENTED_IF_MSG(instr.generates_cc,
+ "Condition codes generation in BFE is not implemented");
+
+ const Node inner_shift_imm = Immediate(static_cast<u32>(instr.bfe.GetLeftShiftValue()));
+ const Node outer_shift_imm =
+ Immediate(static_cast<u32>(instr.bfe.GetLeftShiftValue() + instr.bfe.shift_position));
+
+ const Node inner_shift =
+ Operation(OperationCode::ILogicalShiftLeft, NO_PRECISE, op_a, inner_shift_imm);
+ const Node outer_shift =
+ Operation(OperationCode::ILogicalShiftRight, NO_PRECISE, inner_shift, outer_shift_imm);
+
+ SetRegister(bb, instr.gpr0, outer_shift);
+ break;
+ }
+ default:
+ UNIMPLEMENTED_MSG("Unhandled BFE instruction: {}", opcode->get().GetName());
+ }
return pc;
}