From 4d38e69fd9b2afb89198be5a7d0301c75e74ac87 Mon Sep 17 00:00:00 2001
From: Walter <walter.kruger@hotmail.com>
Date: Tue, 16 Jun 2026 15:06:06 +1000
Subject: [PATCH] Make SSE2 compatible

Removed the SSE4.1 instruction to make it compatible with the baseline instruction set. Increased dependency chain by one instruction and caused constant generation to be slightly more expensive.
---
 rpcs3/Emu/Cell/SPUASMJITRecompiler.cpp | 47 ++++++++++----------------
 1 file changed, 18 insertions(+), 29 deletions(-)

diff --git a/rpcs3/Emu/Cell/SPUASMJITRecompiler.cpp b/rpcs3/Emu/Cell/SPUASMJITRecompiler.cpp
index d6860bd1fc..14cd7314dc 100644
--- a/rpcs3/Emu/Cell/SPUASMJITRecompiler.cpp
+++ b/rpcs3/Emu/Cell/SPUASMJITRecompiler.cpp
@@ -3343,44 +3343,33 @@ void spu_recompiler::HGT(spu_opcode_t op)
 
 void spu_recompiler::CLZ(spu_opcode_t op)
 {
+	const XmmLink& va = XmmGet(op.ra, XmmType::Int);
+
 	if (utils::has_avx512())
 	{
-		const XmmLink& va = XmmGet(op.ra, XmmType::Int);
 		const XmmLink& vt = XmmAlloc();
 		c->vplzcntd(vt, va);
 		c->movdqa(SPU_OFF_128(gpr, op.rt), vt);
 		return;
 	}
-	
-	if (utils::has_sse41())
-	{
-		// Use signed conversion to float, as exponent is ilog2
-		// Fixup "negative" cases by overwriting with zero
-		const u32 exp_bias = 127;
 
-		const XmmLink& va = XmmGet(op.ra, XmmType::Int);
-		const XmmLink& vf = XmmAlloc();
-		const XmmLink& v1 = XmmAlloc();
-		c->cvtdq2ps(vf, va); // only correct with round-towards-zero
-		c->psrld(vf, 23);
-		c->movdqa(v1, XmmConst(v128::from32p(exp_bias - 1)));
-		c->psignd(v1, va);	// conditional zeroing
-		c->paddd(v1, XmmConst(v128::from32p(32))); 
-		c->psubd(v1, vf);	// (x==0)? 32 : 31 - (exponent - exp_bias)
-		c->pxor(vf, vf);
-		c->blendvps(v1, vf, va);
-		c->movdqa(SPU_OFF_128(gpr, op.rt), v1);
-		return;
-	}
+	// Use signed conversion to float, as exponent is ilog2
+	// Fixup "negative" cases by overwriting with zero
+	const u32 exp_bias = 127;
 
-	c->mov(qw0->r32(), 32 + 31);
-	for (u32 i = 0; i < 4; i++) // unrolled loop
-	{
-		c->bsr(*addr, SPU_OFF_32(gpr, op.ra, &v128::_u32, i));
-		c->cmovz(*addr, qw0->r32());
-		c->xor_(*addr, 31);
-		c->mov(SPU_OFF_32(gpr, op.rt, &v128::_u32, i), *addr);
-	}
+	const XmmLink& vf = XmmAlloc();
+	const XmmLink& v1 = XmmAlloc();
+	c->cvtdq2ps(vf, va); // only correct with round-towards-zero
+	c->psrld(vf, 23);
+	c->pxor(v1, v1);
+	c->pcmpeqd(v1, va);
+	c->pand(v1, XmmConst(v128::from32p(32 ^ (31 + exp_bias))));
+	c->pxor(v1, XmmConst(v128::from32p(31 + exp_bias)));
+	c->psubd(v1, vf);	// (x==0)? 32 : 31 - (exponent - exp_bias)
+	c->psrad(va, 31);
+	c->pandn(va, v1);
+	c->movdqa(SPU_OFF_128(gpr, op.rt), va);
+	return;
 }
 
 void spu_recompiler::XSWD(spu_opcode_t op)