[Bug target/121599] [15/16 Regression] ICE (unrecognizable insn) with SVE2 saturating add intrinsics since r15-5957-g5289540ed58e42

[jschmitz at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121599

--- Comment #2 from Jennifer Schmitz <jschmitz at gcc dot gnu.org> ---
I can confirm the ICE. Thanks for the report.
However, I think that g5289540ed58e42ae66255e31f22afe4ca0a6e15e only revealed a
previously existing problem by folding the inner call
(svuqadd_n_s8_z(svpfalse(), c, e)) to a zero vector.

I compiled the following snippet with GCC built from the parent commit
(g8772f37e45e9401c9a361548e00c9691424e75e0) and it has the same ICE:

#include <arm_sve.h>

svuint8_t f2 (svbool_t pg, svuint8_t op1)
{
    return svsqadd_u8_z (pg, op1, svdup_s8 (0));
}

I will investigate why the insn is not recognized.