[Bug middle-end/113607] [14] RISC-V rv64gcv vector: Runtime mismatch at -O3

["cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113607

--- Comment #24 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Robin Dapp <rdapp@gcc.gnu.org>:

https://gcc.gnu.org/g:8123f3ca3fd891034a8366518e756f161c4ff40d

commit r14-8668-g8123f3ca3fd891034a8366518e756f161c4ff40d
Author: Robin Dapp <rdapp@ventanamicro.com>
Date:   Tue Jan 30 18:39:08 2024 +0100

    match: Fix vcond into conditional op folding [PR113607].

    In PR113607 we see an invalid fold of

      _429 = .COND_SHL (mask_patt_205.47_276, vect_cst__262, vect_cst__262, {
0, ... });
      vect_prephitmp_129.51_282 = _429;
      vect_iftmp.55_287 = VEC_COND_EXPR <mask_patt_209.54_286,
vect_prephitmp_129.51_282, vect_cst__262>;

    to

      Applying pattern match.pd:9607, gimple-match-10.cc:3817
      gimple_simplified to vect_iftmp.55_287 = .COND_SHL (mask_patt_205.47_276,
vect_cst__262, vect_cst__262, { 0, ... });

    where we essentially use COND_SHL's else instead of VEC_COND_EXPR's.

    This patch adjusts the corresponding match.pd pattern and makes it only
    match when the else values are the same.

    That, however, causes the exact test case for which this pattern was
    introduced for to fail.  Therefore XFAIL it for now.

    gcc/ChangeLog:

            PR middle-end/113607

            * match.pd: Make sure else values match when folding a
            vec_cond into a conditional operation.

    gcc/testsuite/ChangeLog:

            * gcc.target/aarch64/sve/pre_cond_share_1.c: XFAIL.
            * gcc.target/riscv/rvv/autovec/pr113607-run.c: New test.
            * gcc.target/riscv/rvv/autovec/pr113607.c: New test.