From 50dad6801b4a7e80403e64af6e14052c148a670c Mon Sep 17 00:00:00 2001
From: Eladash <elad3356p@gmail.com>
Date: Tue, 18 Jul 2023 20:56:10 +0300
Subject: [PATCH] SPU LLVM: Use get_known_bits() in SHUFB

---
 rpcs3/Emu/Cell/SPURecompiler.cpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/rpcs3/Emu/Cell/SPURecompiler.cpp b/rpcs3/Emu/Cell/SPURecompiler.cpp
index 69284d0109..211805cc4d 100644
--- a/rpcs3/Emu/Cell/SPURecompiler.cpp
+++ b/rpcs3/Emu/Cell/SPURecompiler.cpp
@@ -8572,8 +8572,13 @@ public:
 			return;
 		}
 
-		// (TODO: implement via known-bits-lookup) Check whether shuffle mask doesn't contain fixed value selectors
-		const auto [perm_only, dummy1] = match_expr(c, match<u8[16]>() & 31);
+		// Check whether shuffle mask doesn't contain fixed value selectors
+		bool perm_only = false;
+
+		if (auto k = get_known_bits(c); !!(k.Zero & 0x80))
+		{
+			perm_only = true;
+		}
 
 		const auto a = get_vr<u8[16]>(op.ra);
 		const auto b = get_vr<u8[16]>(op.rb);