From bfa5c508ce711554ffbd630d44775e2a1cbec323 Mon Sep 17 00:00:00 2001
From: squidbus <175574877+squidbus@users.noreply.github.com>
Date: Fri, 29 Aug 2025 18:11:14 -0700
Subject: [PATCH] constant_propagation_pass: Handle a few more bitwise
 instructions. (#3482)

Co-authored-by: TheTurtle <47210458+raphaelthegreat@users.noreply.github.com>
---
 .../ir/passes/constant_propagation_pass.cpp    | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/shader_recompiler/ir/passes/constant_propagation_pass.cpp b/src/shader_recompiler/ir/passes/constant_propagation_pass.cpp
index dc1762fab..b877a6e87 100644
--- a/src/shader_recompiler/ir/passes/constant_propagation_pass.cpp
+++ b/src/shader_recompiler/ir/passes/constant_propagation_pass.cpp
@@ -456,6 +456,24 @@ void ConstantPropagation(IR::Block& block, IR::Inst& inst) {
     case IR::Opcode::BitwiseXor32:
         FoldWhenAllImmediates(inst, [](u32 a, u32 b) { return a ^ b; });
         return;
+    case IR::Opcode::BitwiseNot32:
+        FoldWhenAllImmediates(inst, [](u32 a) { return ~a; });
+        return;
+    case IR::Opcode::BitReverse32:
+        FoldWhenAllImmediates(inst, [](u32 a) {
+            u32 res{};
+            for (s32 i = 0; i < 32; i++, a >>= 1) {
+                res = (res << 1) | (a & 1);
+            }
+            return res;
+        });
+        return;
+    case IR::Opcode::BitCount32:
+        FoldWhenAllImmediates(inst, [](u32 a) { return static_cast<u32>(std::popcount(a)); });
+        return;
+    case IR::Opcode::BitCount64:
+        FoldWhenAllImmediates(inst, [](u64 a) { return static_cast<u32>(std::popcount(a)); });
+        return;
     case IR::Opcode::BitFieldUExtract:
         FoldWhenAllImmediates(inst, [](u32 base, u32 shift, u32 count) {
             if (static_cast<size_t>(shift) + static_cast<size_t>(count) > 32) {