Emulation/mupen64plus-rsp-cxd4
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Correct VCH sign flag comparison on -32768.

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unknown 2015-01-18 12:56:16 -05:00
parent 74b3ee72ce
commit c42ac84651
1 changed files with 5 additions and 2 deletions
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7
vu/select.c
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@ -230,8 +230,11 @@ INLINE static void do_ch(short* VD, short* VS, short* VT)
#ifndef _DEBUG
short diff[N];
#endif
i16 cch[N]; /* corner case hack: -(-32768) with undefined sign */
register int i;
for (i = 0; i < N; i++)
cch[i] = (VT[i] == -32768) ? ~0 : 0; /* -(-32768) might not be >= 0. */
vector_copy(VC, VT);
for (i = 0; i < N; i++)
sn[i] = VS[i] ^ VT[i];
@ -244,9 +247,9 @@ INLINE static void do_ch(short* VD, short* VS, short* VT)
for (i = 0; i < N; i++)
vce[i] &= sn[i];
for (i = 0; i < N; i++)
VC[i] -= sn[i]; /* converts ~(VT) into -(VT) if (sign) */
VC[i] -= sn[i] & cch[i]; /* converts ~(VT) into -(VT) if (sign) */
for (i = 0; i < N; i++)
eq[i] = (VS[i] == VC[i]);
eq[i] = (VS[i] == VC[i]) & ~cch[i]; /* (VS == +32768) is never true. */
for (i = 0; i < N; i++)
eq[i] |= vce[i];