[PATCH 0/7] riscv: Improve builtins expansion

[Christoph Muellner]

From: Christoph Müllner <christoph.muellner@vrull.eu>

This patchset adds includes patches to improve the following builtin
expansions:

* cpymemsi: Allow by-pieces to generate overlapping memory accesses
* cmpstrsi: Add expansion for strcmp and strncmp for aligned strings when zbb/orc.b is available
* strlen<mode>: Add expansion for strlen when zbb/orc.b is available

This changes were inspired a lot by the PowerPC backend
(e.g. moving the expansion code into riscv-string.cc and emitting an
unrolled loop which eventually calls the C runtime if necessary).

This series is meant to be applied on top of the VT1 support series:
  https://gcc.gnu.org/pipermail/gcc-patches/2022-November/605959.html

The patches come with their own tests and show no regressions to
existing tests. Further the series has been tested with all SPEC CPU2017
benchmarks.

Christoph Müllner (6):
  riscv: bitmanip/zbb: Add prefix/postfix and enable visiblity
  riscv: Enable overlap-by-pieces via tune param
  riscv: Move riscv_block_move_loop to separate file
  riscv: Use by-pieces to do overlapping accesses in block_move_straight
  riscv: Add support for strlen inline expansion
  riscv: Add support for str(n)cmp inline expansion

Philipp Tomsich (1):
  riscv: bitmanip: add orc.b as an unspec

 gcc/config.gcc                                |   3 +-
 gcc/config/riscv/bitmanip.md                  |  12 +-
 gcc/config/riscv/riscv-protos.h               |   7 +-
 gcc/config/riscv/riscv-string.cc              | 687 ++++++++++++++++++
 gcc/config/riscv/riscv.cc                     | 172 +----
 gcc/config/riscv/riscv.md                     | 105 ++-
 gcc/config/riscv/riscv.opt                    |   5 +
 gcc/config/riscv/t-riscv                      |   4 +
 .../gcc.target/riscv/memcpy-nonoverlapping.c  |  54 ++
 .../gcc.target/riscv/memcpy-overlapping.c     |  47 ++
 .../gcc.target/riscv/memset-nonoverlapping.c  |  45 ++
 .../gcc.target/riscv/memset-overlapping.c     |  43 ++
 .../gcc.target/riscv/zbb-strcmp-unaligned.c   |  36 +
 gcc/testsuite/gcc.target/riscv/zbb-strcmp.c   |  55 ++
 .../gcc.target/riscv/zbb-strlen-unaligned.c   |  13 +
 gcc/testsuite/gcc.target/riscv/zbb-strlen.c   |  18 +
 16 files changed, 1132 insertions(+), 174 deletions(-)
 create mode 100644 gcc/config/riscv/riscv-string.cc
 create mode 100644 gcc/testsuite/gcc.target/riscv/memcpy-nonoverlapping.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/memcpy-overlapping.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/memset-nonoverlapping.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/memset-overlapping.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/zbb-strcmp-unaligned.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/zbb-strcmp.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/zbb-strlen-unaligned.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/zbb-strlen.c

-- 
2.38.1