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-rw-r--r--src/video_core/shader/decode/bfe.cpp31
1 files changed, 25 insertions, 6 deletions
diff --git a/src/video_core/shader/decode/bfe.cpp b/src/video_core/shader/decode/bfe.cpp
index c3ef88373..911d53657 100644
--- a/src/video_core/shader/decode/bfe.cpp
+++ b/src/video_core/shader/decode/bfe.cpp
@@ -33,17 +33,36 @@ u32 ShaderIR::DecodeBfe(NodeBlock& bb, u32 pc) {
}();
UNIMPLEMENTED_IF_MSG(instr.bfe.rd_cc, "Condition codes in BFE is not implemented");
- UNIMPLEMENTED_IF_MSG(instr.bfe.brev, "BREV in BFE is not implemented");
const bool is_signed = instr.bfe.is_signed;
- const auto start_position = SignedOperation(OperationCode::IBitfieldExtract, is_signed, op_b,
- Immediate(0), Immediate(8));
+ if (instr.bfe.brev) {
+ const auto swap = [&](u32 s, u32 mask) {
+ Node v1 =
+ SignedOperation(OperationCode::ILogicalShiftRight, is_signed, op_a, Immediate(s));
+ if (mask != 0) {
+ v1 = SignedOperation(OperationCode::IBitwiseAnd, is_signed, v1, Immediate(mask));
+ }
+ Node v2 = op_a;
+ if (mask != 0) {
+ v2 = SignedOperation(OperationCode::IBitwiseAnd, is_signed, op_a, Immediate(mask));
+ }
+ v2 = SignedOperation(OperationCode::ILogicalShiftLeft, is_signed, v2, Immediate(s));
+ return SignedOperation(OperationCode::IBitwiseOr, is_signed, v1, v2);
+ };
+ op_a = swap(1, 0x55555555U);
+ op_a = swap(2, 0x33333333U);
+ op_a = swap(4, 0x0F0F0F0FU);
+ op_a = swap(8, 0x00FF00FFU);
+ op_a = swap(16, 0);
+ }
+
+ const auto offset = SignedOperation(OperationCode::IBitfieldExtract, is_signed, op_b,
+ Immediate(0), Immediate(8));
const auto bits = SignedOperation(OperationCode::IBitfieldExtract, is_signed, op_b,
Immediate(8), Immediate(8));
-
- auto result =
- SignedOperation(OperationCode::IBitfieldExtract, is_signed, op_a, start_position, bits);
+ const auto result =
+ SignedOperation(OperationCode::IBitfieldExtract, is_signed, op_a, offset, bits);
SetRegister(bb, instr.gpr0, result);
return pc;