[AArch64] Generate permute patterns using rtx builders

Programming / Compilers / GCC - rsandifo [138bc75d-0d04-0410-961f-82ee72b054a4] - 1 November 2017 20:40 EDT

This patch replaces switch statements that call specific generator functions with code that constructs the rtl pattern directly. This seemed to scale better to SVE and also seems less error-prone.

As a side-effect, the patch fixes the REV handling for diff==1,
vmode==E_V4HFmode and adds missing support for diff==3,

To compensate for the lack of switches that check for specific modes, the patch makes aarch64_expand_vec_perm_const_1 reject permutes on single-element vectors (specifically V1DImode).

2017-11-01 Richard Sandiford Alan Hayward David Sherwood

- config/aarch64/aarch64.c (aarch64_evpc_trn, aarch64_evpc_uzp) (aarch64_evpc_zip, aarch64_evpc_ext, aarch64_evpc_rev) (aarch64_evpc_dup): Generate rtl direcly, rather than using named expanders. (aarch64_expand_vec_perm_const_1): Explicitly check for permutes of a single element.
- config/aarch64/iterators.md: Add a comment above the permute unspecs to say that they are generated directly by aarch64_expand_vec_perm_const.
- config/aarch64/aarch64-simd.md: Likewise the permute instructions.

ce405054618 [AArch64] Generate permute patterns using rtx builders
gcc/ChangeLog | 15 +++
gcc/config/aarch64/aarch64-simd.md | 11 +-
gcc/config/aarch64/aarch64.c | 241 ++++---------------------------------
gcc/config/aarch64/iterators.md | 7 +-
4 files changed, 57 insertions(+), 217 deletions(-)

Upstream: gcc.gnu.org

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