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Convert 1 to 1.0, not 0.0, for machines with 64-bit long.

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This fixes flt_arith2flt() when sizeof(arith) != 4, where arith is
long.  When cemcom.ansi sees an expression like d + 1 (where d is some
double), it calls flt_arith2flt() to convert 1 to floating-point.  On
machines where sizeof(arith) != 4, the code did n >>= 1 when n should
not have been changed.  If n was 1, then n == 0 became true.  This
caused the code to convert 1 or -1 to 0.0.

My fix assumes sizeof(arith) >= 8, so I can use n >> 32.  Machines
with sizeof(arith) of 5 to 7 would need to do (uarith)n >> 32, where
uarith must be an unsigned integer type of same size as arith.

In startrek.c, the Enterprise can now dock with a starbase.  The
compiler no longer translates s1 - 1 to s1 - 0.0 and s1 + 1 to s1 +
0.0, so the game now looks for starbases next to the Enterprise.
This commit is contained in:
George Koehler 2016-11-06 19:34:51 -05:00
parent 08f9869a63
commit e5e96d5226
1 changed files with 3 additions and 4 deletions
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7
modules/src/flt_arith/flt_ar2flt.c
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@ -25,10 +25,9 @@ flt_arith2flt(n, e, uns)
e->m1 = 0; e->m2 = n;
}
else {
e->m2 = n & 0xffffffffL;
n >>= 1;
n &= ~((arith) 1 << (8*sizeof(arith)-1));
e->m1 = (n >> 31);
/* assuming sizeof(arith) >= 8 */
e->m1 = n >> 32;
e->m2 = n;
}
if (n == 0) {
e->flt_exp = 0;