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corrected and temporarily disabled an old optimization for Conker's

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It is unknown as of yet which if any games this fix affects.  I didn't notice the issue because of a visible regression within a test program; I noticed it after reading code that LegendOfDragoon linked to which failed comparisons to the original implementation he was comparing against.
This commit is contained in:
Iconoclast 2018-11-27 11:30:16 -05:00
parent 41e810cd1d
commit 19338455a5
1 changed files with 5 additions and 5 deletions
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10
mupen64plus-rsp-cxd4/vu/divide.c
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@ -1,7 +1,7 @@
/******************************************************************************\
* Project: MSP Simulation Layer for Vector Unit Computational Divides *
* Authors: Iconoclast *
* Release: 2018.11.25 *
* Release: 2018.11.27 *
* License: CC0 Public Domain Dedication *
* *
* To the extent possible under law, the author(s) have dedicated all copyright *
@ -1080,14 +1080,14 @@ NOINLINE static void do_div(i32 data, int sqrt, int precision)
int fetch;
int shift;
#if (~0 >> 1 == -1)
data ^= (s32)(data + 32768) >> 31; /* DP only: (data < -32768) */
fetch = (s32)(data + 0) >> 31;
#if ((~0 >> 1 == -1) && (0))
data ^= (s32)(((s64)data + 32768) >> 63); /* DP only: (data < -32768) */
fetch = (s32)(((s32)data + 0) >> 31);
data ^= fetch;
data -= fetch; /* two's complement: -x == ~x - (~0) on wrap-around */
#else
if (precision == SP_DIV_PRECISION_SINGLE)
data = (data < 0) ? -data : +data;
data = (data < 0) ? -data : +data;
if (precision == SP_DIV_PRECISION_DOUBLE && data < 0)
data = (data >= -32768) ? -data : ~data;
#endif