[PATCH][committed] aarch64: Simplify QSHRN expanders and patterns

Wed, 10 May 2023 02:46:14 -0700 

Hi all,

This patch deletes the explicit BYTES_BIG_ENDIAN and !BYTES_BIG_ENDIAN patterns 
for the QSHRN instructions in favour
of annotating a single one with <vczle><vczbe>. This allows simplification of 
the expander too.
Tests are added to ensure that we still optimise away the concat-with-zero use 
case.

Bootstrapped and tested on aarch64-none-linux-gnu and aarch64_be-none-elf.
Pushing to trunk.
Thanks,
Kyrill

gcc/ChangeLog:

        * config/aarch64/aarch64-simd.md
        (aarch64_<sur>q<r>shr<u>n_n<mode>_insn_le): Delete.
        (aarch64_<sur>q<r>shr<u>n_n<mode>_insn_be): Delete.
        (aarch64_<sur>q<r>shr<u>n_n<mode>_insn<vczle><vczbe>): New define_insn.
        (aarch64_<sur>q<r>shr<u>n_n<mode>): Simplify expander.

gcc/testsuite/ChangeLog:

        * gcc.target/aarch64/simd/pr99195_5.c: New test.

Attachment: qshrn.patch
Description: qshrn.patch

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