From b9c026d441997b24c8373f7f300f5098122ae430 Mon Sep 17 00:00:00 2001
From: Nekotekina <nekotekina@gmail.com>
Date: Thu, 5 Jul 2018 15:37:48 +0300
Subject: [PATCH] SPU LLVM: improve ROTMA and ROTMAH instructions

Avoid sign extension, clamp shift amount with min op
---
 rpcs3/Emu/Cell/SPURecompiler.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/rpcs3/Emu/Cell/SPURecompiler.cpp b/rpcs3/Emu/Cell/SPURecompiler.cpp
index 73114841f6..681eadd0a6 100644
--- a/rpcs3/Emu/Cell/SPURecompiler.cpp
+++ b/rpcs3/Emu/Cell/SPURecompiler.cpp
@@ -3086,7 +3086,8 @@ public:
 
 	void ROTMA(spu_opcode_t op)
 	{
-		set_vr(op.rt, trunc<u32[4]>(sext<s64[4]>(get_vr(op.ra)) >> zext<s64[4]>(-get_vr(op.rb) & 0x3f)));
+		const auto sh = eval(-get_vr(op.rb) & 0x3f);
+		set_vr(op.rt, get_vr<s32[4]>(op.ra) >> bitcast<s32[4]>(min(sh, splat<u32[4]>(0x1f))));
 	}
 
 	void SHL(spu_opcode_t op)
@@ -3106,7 +3107,8 @@ public:
 
 	void ROTMAH(spu_opcode_t op)
 	{
-		set_vr(op.rt, trunc<u16[8]>(sext<s32[8]>(get_vr<u16[8]>(op.ra)) >> zext<s32[8]>(-get_vr<u16[8]>(op.rb) & 0x1f)));
+		const auto sh = eval(-get_vr<u16[8]>(op.rb) & 0x1f);
+		set_vr(op.rt, get_vr<s16[8]>(op.ra) >> bitcast<s16[8]>(min(sh, splat<u16[8]>(0xf))));
 	}
 
 	void SHLH(spu_opcode_t op)