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exact zero minus a number is negation (fixes issue #523)

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Alex Shinn 2019-03-05 23:35:15 +08:00
parent 09b564ed7b
commit 80bf4013f9
2 changed files with 3 additions and 3 deletions
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2
bignum.c
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@ -1347,7 +1347,7 @@ sexp sexp_sub (sexp ctx, sexp a, sexp b) {
r = sexp_fx_sub(a, b); /* VM catches this case */
break;
case SEXP_NUM_FIX_FLO:
r = sexp_make_flonum(ctx, sexp_fixnum_to_double(a)-sexp_flonum_value(b));
r = sexp_make_flonum(ctx, a==SEXP_ZERO ? -sexp_flonum_value(b) : sexp_fixnum_to_double(a)-sexp_flonum_value(b));
break;
case SEXP_NUM_FIX_BIG:
tmp1 = sexp_fixnum_to_bignum(ctx, a);

4
vm.c
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@ -1717,9 +1717,9 @@ sexp sexp_apply (sexp ctx, sexp proc, sexp args) {
else if (sexp_flonump(tmp1) && sexp_flonump(tmp2))
_ARG1 = sexp_fp_sub(ctx, tmp1, tmp2);
else if (sexp_flonump(tmp1) && sexp_fixnump(tmp2))
_ARG1 = sexp_make_flonum(ctx, sexp_flonum_value(tmp1) - (double)sexp_unbox_fixnum(tmp2));
_ARG1 = sexp_make_flonum(ctx, sexp_flonum_value(tmp1) - sexp_fixnum_to_double(tmp2));
else if (sexp_fixnump(tmp1) && sexp_flonump(tmp2))
_ARG1 = sexp_make_flonum(ctx, (double)sexp_unbox_fixnum(tmp1) - sexp_flonum_value(tmp2));
_ARG1 = sexp_make_flonum(ctx, tmp1==SEXP_ZERO ? -sexp_flonum_value(tmp2) : sexp_fixnum_to_double(tmp1)-sexp_flonum_value(tmp2));
#endif
else sexp_raise("-: not a number", sexp_list2(ctx, tmp1, tmp2));
#endif