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Re: [PATCH] tailcall: Handle NEGATE_EXPR and MINUS_EXPR
- From: Paolo Carlini <paolo dot carlini at oracle dot com>
- To: Giuseppe Scrivano <gscrivano at gnu dot org>
- Cc: gcc-patches at gcc dot gnu dot org
- Date: Mon, 16 Aug 2010 14:20:42 +0200
- Subject: Re: [PATCH] tailcall: Handle NEGATE_EXPR and MINUS_EXPR
- References: <87vd7ffg93.fsf@valhalla.homenet>
Hi,
> +int foo (int n)
> +{
> + return n == 0 ? 1 : n * (n - foo (n - 1));
> +}
> +
> +int bar (int n)
> +{
> + return n == 0 ? 1 : n * (- bar (n - 1));
> +}
> +
> +int baz (int n, int m)
> +{
> + return n == 0 ? 100 : (baz (n - 1, m) - m);
> +}
> +
> +int main(void)
> +{
> + if (foo (11) != -39916789)
> + abort ();
> +
> + if (bar (11) != -39916800)
> + abort ();
>
As a matter of fact, I don't think the testsuite is completely clean wrt
16-bit machines, but maybe better using long anyway?
Thanks,
Paolo.