70c50c8727
Convert be sinked into a vec_cond if both sides
fold. Unlike other unary operations, we need to check that we still can handle
this vec_cond's first operand is the same as the new truth type.
I tried a few different versions of this patch:
view_convert to the new truth_type but that does not work as we always support all vec_cond
afterwards.
using expand_vec_cond_expr_p; but that would allow too much.
I also tried to see if view_convert can be handled here but we end up with:
_3 = VEC_COND_EXPR <_2, { Nan(-1), Nan(-1), Nan(-1), Nan(-1) }, { 0.0, 0.0, 0.0, 0.0 }>;
Which isel does not know how to handle as just being a view_convert from `vector(4) <signed-boolean:32>`
to `vector(4) float` and causes a regression with `g++.target/i386/pr88152.C`
Note, in the case of the SVE testcase, we will sink negate after the convert and be able
to remove a few extra instructions in the end.
Also with this change gcc.target/aarch64/sve/cond_unary_5.c will now pass.
Committed as approved after a bootstrapped and tested on x86_64-linux-gnu and aarch64-linux-gnu.
gcc/ChangeLog:
PR tree-optimization/111006
PR tree-optimization/110986
* match.pd: (op(vec_cond(a,b,c))): Handle convert for op.
gcc/testsuite/ChangeLog:
PR tree-optimization/111006
* gcc.target/aarch64/sve/cond_convert_7.c: New test.
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