[Bug target/96463] [SVE] Optimise svld1rq from vectors

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96463

--- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Prathamesh Kulkarni
<prathamesh3492@gcc.gnu.org>:

https://gcc.gnu.org/g:494bec025002df422f2faa947138bf3643d80b54

commit r13-1055-g494bec025002df422f2faa947138bf3643d80b54
Author: Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org>
Date:   Sun Jun 12 08:50:16 2022 +0530

    PR96463: Optimise svld1rq from vectors for little endian AArch64 targets.

    The patch folds:
    lhs = svld1rq({-1, -1, ...}, rhs)
    into:
    tmp = mem_ref<vectype> [(elem_type * {ref-all}) rhs]
    lhs = vec_perm_expr<tmp, tmp, {0, 1, 2, 3 ...}>.
    which is then expanded using aarch64_expand_sve_dupq.

    Example:

    svint32_t
    foo (int32x4_t x)
    {
      return svld1rq (svptrue_b8 (), &x[0]);
    }

    code-gen:
    foo:
    .LFB4350:
            dup     z0.q, z0.q[0]
            ret

    The patch relaxes type-checking for VEC_PERM_EXPR by allowing different
    vector types for lhs and rhs provided:
    (1) rhs3 is constant and has integer type element.
    (2) len(lhs) == len(rhs3) and len(rhs1) == len(rhs2)
    (3) lhs and rhs have same element type.

    gcc/ChangeLog:
            PR target/96463
            * config/aarch64/aarch64-sve-builtins-base.cc: Include ssa.h.
            (svld1rq_impl::fold): Define.
            * config/aarch64/aarch64.cc (expand_vec_perm_d): Define new members
            op_mode and op_vec_flags.
            (aarch64_evpc_reencode): Initialize newd.op_mode and
            newd.op_vec_flags.
            (aarch64_evpc_sve_dup): New function.
            (aarch64_expand_vec_perm_const_1): Gate existing calls to
            aarch64_evpc_* functions under d->vmode == d->op_mode,
            and call aarch64_evpc_sve_dup.
            (aarch64_vectorize_vec_perm_const): Remove assert
            d->vmode != d->op_mode, and initialize d.op_mode and
d.op_vec_flags.
            * tree-cfg.cc (verify_gimple_assign_ternary): Allow different
            vector types for lhs and rhs in VEC_PERM_EXPR if rhs3 is
            constant.

    gcc/testsuite/ChangeLog:
            PR target/96463
            * gcc.target/aarch64/sve/acle/general/pr96463-1.c: New test.
            * gcc.target/aarch64/sve/acle/general/pr96463-2.c: Likewise.