GS/SW: Don't use fast reciprocal stq calculation, it's too inaccurate

PCSX2 · May 14, 2024 · 45d46a4 · 45d46a4
1 parent e520dc2
commit 45d46a4
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Showing 2 changed files with 5 additions and 8 deletions.
diff --git a/pcsx2/GS/Renderers/SW/GSDrawScanlineCodeGenerator.all.cpp b/pcsx2/GS/Renderers/SW/GSDrawScanlineCodeGenerator.all.cpp
@@ -1173,10 +1173,8 @@ void GSDrawScanlineCodeGenerator::SampleTexture()
 
 	if (!m_sel.fst)
 	{
-		rcpps(xym0, _q);
-
-		MOVE_IF_64(mulps, xym2, _s, xym0);
-		MOVE_IF_64(mulps, xym3, _t, xym0);
+		MOVE_IF_64(divps, xym2, _s, _q);
+		MOVE_IF_64(divps, xym3, _t, _q);
 
 		cvttps2dq(xym2, xym2);
 		cvttps2dq(xym3, xym3);
@@ -1576,10 +1574,8 @@ void GSDrawScanlineCodeGenerator::SampleTextureLOD()
 
 	if (!m_sel.fst)
 	{
-		rcpps(xym0, xym4);
-
-		MOVE_IF_64(mulps, xym2, _s, xym0);
-		MOVE_IF_64(mulps, xym3, _t, xym0);
+		MOVE_IF_64(divps, xym2, _s, xym4);
+		MOVE_IF_64(divps, xym3, _t, xym4);
 
 		cvttps2dq(xym2, xym2);
 		cvttps2dq(xym3, xym3);

diff --git a/pcsx2/GS/Renderers/SW/GSNewCodeGenerator.h b/pcsx2/GS/Renderers/SW/GSNewCodeGenerator.h
@@ -256,6 +256,7 @@ class GSNewCodeGenerator
 	AFORWARD(2, cvtss2sd,  ARGS_XO)
 	SFORWARD(2, cvttps2dq, ARGS_XO)
 	SFORWARD(2, cvttsd2si, const AddressReg&, const Operand&);
+	AFORWARD(2, divps,	   ARGS_XO)
 	SFORWARD(3, extractps, const Operand&, const Xmm&, u8)
 	AFORWARD(2, maxps,     ARGS_XO)
 	AFORWARD(2, minps,     ARGS_XO)