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On 05/06/11 04:44, Zdenek Dvorak wrote:
> Hi,
>
> when accumulator transformation is performed on a function like
>
> foo(a)
> {
> if (a > 0)
> return 1 + foo (a - 1)
>
> return bla();
> }
>
> this becomes
>
> foo(a)
> {
> int tmp = 0;
>
> while (a > 0)
> tm = 1 + tmp;
>
> return tmp + bla();
> }
>
> Before, bla was a tail-call, but after the optimization, it is not (since an
> addition
> has to be performed after the result of bla is known). However, we used to
> mark bla
> as tail-call, leading to a misscompilation later. Fixed by not marking
> tail-calls
> when the transformation is performed. Bootstrapped and regtested on i686.
>
> Zdenek
>
> PR tree-optimization/48837
> * tree-tailcall.c (tree_optimize_tail_calls_1): Do not mark tailcalls
> when accumulator transformation is performed.
>
> * gcc.dg/pr48837.c: New testcase.
OK.
Thanks,
jeff
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