[PATCH] Build proper false constant for VECTOR_TYPEs.

[Marc Glisse]

On Fri, 6 Sep 2019, Martin Liška wrote:

> I've been working on transition of cond expressions to match.pd.
> With my changes I noticed there's one wrong pattern that leads to:
>
> Transforming _6 > _7 & _6 < _7 into 0
> ...
> /home/marxin/Programming/gcc/gcc/testsuite/c-c++-common/vector-compare-3.c:20:1: error: the first argument of a ‘vec_cond_expr’ must be of a boolean vector type of the same number of elements as the result
>   20 | g (v4i *x, v4i const *y, v4i *z, v4i *t)
>      | ^
> vector(4) int
> _Bool
> _9 = VEC_COND_EXPR <0, { -1, -1, -1, -1 }, { 0, 0, 0, 0 }>;
>
> which is wrong.
>
> Proper simlification is:
> Transforming _6 > _7 & _6 < _7 into { 0, 0, 0, 0 }
>
> Patch can bootstrap on x86_64-linux-gnu and survives regression tests.
>
> Ready to be installed?

I don't think so. I believe you are calling the transformation with a 
wrong 'type' and that's what needs fixing.

-- 
Marc Glisse