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r33162 Monday 3rd November, 2014 at 10:10:35 UTC by Ryan Holtz
mips3drc: Generate -0.0 for NEG.S/D of 0.0 as FNEG does not on x86 [MooglyGuy]

[src/emu/bus/dmv]	k803.c
[src/emu/cpu/mips]	mips3drc.c

trunk/src/emu/bus/dmv/k803.c

r241673	r241674
53	53	: device_t(mconfig, DMV_K803, "K803 RTC", tag, owner, clock, "dmv_k803", __FILE__),
54	54	device_dmvslot_interface( mconfig, *this ),
55	55	m_rtc(*this, "rtc"),
56		m_dsw(*this, "DSW")
	56	m_dsw(*this, "DWS")
57	57	{
58	58	}
59	59

trunk/src/emu/cpu/mips/mips3drc.c

r241673	r241674
2764	2764
2765	2765	case 0x07:
2766	2766	if (IS_SINGLE(op))  /* NEG.S - MIPS I */
	2767	{
2767	2768	UML_FSNEG(block, FPR32(FDREG), FPR32(FSREG));               // fsneg   <fdreg>,<fsreg>
	2769	UML_CMP(block, FPR32(FSREG), 0);                            // cmp     <fsreg>,0.0
	2770	UML_MOVc(block, COND_E, FPR32(FDREG), 0x80000000);          // mov     <fdreg>,-0.0,e
	2771	}
2768	2772	else                /* NEG.D - MIPS I */
	2773	{
2769	2774	UML_FDNEG(block, FPR64(FDREG), FPR64(FSREG));               // fdneg   <fdreg>,<fsreg>
	2775	UML_CMP(block, FPR64(FSREG), 0);                            // cmp     <fsreg>,0.0
	2776	UML_DMOVc(block, COND_E, FPR64(FDREG), 0x8000000000000000L);// dmov    <fdreg>,-0.0,e
	2777	}
2770	2778	return TRUE;
2771	2779
2772	2780	case 0x08:

https://github.com/mamedev/mame/commit/583ee09cf416dfeace9d73fb3061f6eb13a9213a

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