First Commit

common/emitter/fpu.cpp

@@ -0,0 +1,60 @@
+// SPDX-FileCopyrightText: 2002-2025 PCSX2 Dev Team
+// SPDX-License-Identifier: GPL-3.0+
+
+#include "common/emitter/legacy_internal.h"
+
+//------------------------------------------------------------------
+// FPU instructions
+//------------------------------------------------------------------
+/* fld m32 to fpu reg stack */
+emitterT void FLD32(u32 from)
+{
+	xWrite8(0xD9);
+	ModRM(0, 0x0, DISP32);
+	xWrite32(MEMADDR(from, 4));
+}
+
+// fld st(i)
+emitterT void FLD(int st) { xWrite16(0xc0d9 + (st << 8)); }
+emitterT void FLD1() { xWrite16(0xe8d9); }
+emitterT void FLDL2E() { xWrite16(0xead9); }
+
+/* fstp m32 from fpu reg stack */
+emitterT void FSTP32(u32 to)
+{
+	xWrite8(0xD9);
+	ModRM(0, 0x3, DISP32);
+	xWrite32(MEMADDR(to, 4));
+}
+
+// fstp st(i)
+emitterT void FSTP(int st) { xWrite16(0xd8dd + (st << 8)); }
+
+emitterT void FRNDINT() { xWrite16(0xfcd9); }
+emitterT void FXCH(int st) { xWrite16(0xc8d9 + (st << 8)); }
+emitterT void F2XM1() { xWrite16(0xf0d9); }
+emitterT void FSCALE() { xWrite16(0xfdd9); }
+emitterT void FPATAN(void) { xWrite16(0xf3d9); }
+emitterT void FSIN(void) { xWrite16(0xfed9); }
+
+/* fadd ST(0) to fpu reg stack ST(src) */
+emitterT void FADD320toR(x86IntRegType src)
+{
+	xWrite8(0xDC);
+	xWrite8(0xC0 + src);
+}
+
+/* fsub ST(src) to fpu reg stack ST(0) */
+emitterT void FSUB32Rto0(x86IntRegType src)
+{
+	xWrite8(0xD8);
+	xWrite8(0xE0 + src);
+}
+
+/* fmul m32 to fpu reg stack */
+emitterT void FMUL32(u32 from)
+{
+	xWrite8(0xD8);
+	ModRM(0, 0x1, DISP32);
+	xWrite32(MEMADDR(from, 4));
+}