From fc93bc2abde0b54a0a495f9b28a76fd34b47f320 Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Sun, 4 Apr 2021 03:04:48 -0300
Subject: shader: Implement BAR and fix memory barriers

---
 .../maxwell/translate/impl/barrier_operations.cpp  | 58 +++++++++++++++++++++-
 1 file changed, 56 insertions(+), 2 deletions(-)

(limited to 'src/shader_recompiler/frontend/maxwell/translate/impl/barrier_operations.cpp')

diff --git a/src/shader_recompiler/frontend/maxwell/translate/impl/barrier_operations.cpp b/src/shader_recompiler/frontend/maxwell/translate/impl/barrier_operations.cpp
index 26d5e276b..2a2a294df 100644
--- a/src/shader_recompiler/frontend/maxwell/translate/impl/barrier_operations.cpp
+++ b/src/shader_recompiler/frontend/maxwell/translate/impl/barrier_operations.cpp
@@ -38,6 +38,7 @@ void TranslatorVisitor::MEMBAR(u64 inst) {
         u64 raw;
         BitField<8, 2, LocalScope> scope;
     } membar{inst};
+
     ir.MemoryBarrier(LocalScopeToMemoryScope(membar.scope));
 }
 
@@ -45,8 +46,61 @@ void TranslatorVisitor::DEPBAR() {
     // DEPBAR is a no-op
 }
 
-void TranslatorVisitor::BAR(u64) {
-    throw NotImplementedException("Instruction {} is not implemented", Opcode::BAR);
+void TranslatorVisitor::BAR(u64 insn) {
+    enum class Mode {
+        RedPopc,
+        Scan,
+        RedAnd,
+        RedOr,
+        Sync,
+        Arrive,
+    };
+    union {
+        u64 raw;
+        BitField<43, 1, u64> is_a_imm;
+        BitField<44, 1, u64> is_b_imm;
+        BitField<8, 8, u64> imm_a;
+        BitField<20, 12, u64> imm_b;
+        BitField<42, 1, u64> neg_pred;
+        BitField<39, 3, IR::Pred> pred;
+    } const bar{insn};
+
+    const Mode mode{[insn] {
+        switch (insn & 0x0000009B00000000ULL) {
+        case 0x0000000200000000ULL:
+            return Mode::RedPopc;
+        case 0x0000000300000000ULL:
+            return Mode::Scan;
+        case 0x0000000A00000000ULL:
+            return Mode::RedAnd;
+        case 0x0000001200000000ULL:
+            return Mode::RedOr;
+        case 0x0000008000000000ULL:
+            return Mode::Sync;
+        case 0x0000008100000000ULL:
+            return Mode::Arrive;
+        }
+        throw NotImplementedException("Invalid encoding");
+    }()};
+    if (mode != Mode::Sync) {
+        throw NotImplementedException("BAR mode {}", mode);
+    }
+    if (bar.is_a_imm == 0) {
+        throw NotImplementedException("Non-immediate input A");
+    }
+    if (bar.imm_a != 0) {
+        throw NotImplementedException("Non-zero input A");
+    }
+    if (bar.is_b_imm == 0) {
+        throw NotImplementedException("Non-immediate input B");
+    }
+    if (bar.imm_b != 0) {
+        throw NotImplementedException("Non-zero input B");
+    }
+    if (bar.pred != IR::Pred::PT && bar.neg_pred != 0) {
+        throw NotImplementedException("Non-true input predicate");
+    }
+    ir.Barrier();
 }
 
 } // namespace Shader::Maxwell
-- 
cgit v1.2.3