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make random slightly faster on 64-bit machines in integer mode

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Exploit the fact that a 32-bit range fits in a fixnum.
This commit is contained in:
Matthew Flatt 2013-11-12 10:25:51 -07:00
parent c81a468bc4
commit 8039f8177d
1 changed files with 14 additions and 1 deletions
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15
racket/src/racket/src/numstr.c
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@ -2712,12 +2712,21 @@ sch_random(int argc, Scheme_Object *argv[])
Scheme_Object *o, *rand_state;
o = argv[0];
#ifdef SIXTY_FOUR_BIT_INTEGERS
if (SCHEME_INTP(o)) {
i = (uintptr_t)SCHEME_INT_VAL(o);
if (i > 4294967087UL)
i = 0;
} else
i = 0;
#else
if (scheme_get_unsigned_int_val(o, &i)) {
if (i > 4294967087UL)
i = 0;
} else
i = 0;
#endif
if (!i) {
scheme_wrong_contract("random",
((argc == 1)
@ -2739,7 +2748,11 @@ sch_random(int argc, Scheme_Object *argv[])
v = sch_int_rand(i, (Scheme_Random_State *)rand_state);
#ifdef SIXTY_FOUR_BIT_INTEGERS
return scheme_make_integer(v);
#else
return scheme_make_integer_value_from_unsigned(v);
#endif
}
}