[PATCH v1 0/8] Improvements to bitmanip-1.0 (Zb[abcs]) support

[Philipp Tomsich]

This series provides assorted improvements for the RISC-V Zb[abcs]
support collected over the last year and a half and forward-ported to
the recently merged upstream support for the Zb[abcs] extensions.

Improvements include:
 - synthesis of HImode bswap from SImode/DImode rev8
 - cost-model change to support shift-and-add (sh[123]add) in the
   strength-reduction of multiplication operations
 - support for constant-loading of (1ULL << 31) on RV64 using bseti
 - generating a polarity-reversed mask from a bit-test
 - adds orc.b as UNSPEC
 - improves min/minu/max/maxu patterns to suppress redundant extensions


Philipp Tomsich (8):
  bswap: synthesize HImode bswap from SImode or DImode
  RISC-V: costs: handle BSWAP
  RISC-V: costs: support shift-and-add in strength-reduction
  RISC-V: bitmanip: fix constant-loading for (1ULL << 31) in DImode
  RISC-V: bitmanip: improvements to rotate instructions
  RISC-V: bitmanip: add splitter to use bexti for "(a & (1 << BIT_NO)) ?
    0 : -1"
  RISC-V: bitmanip: add orc.b as an unspec
  RISC-V: bitmanip: relax minmax to operate on GPR

 gcc/config/riscv/bitmanip.md                 | 74 +++++++++++++++++---
 gcc/config/riscv/riscv.c                     | 31 ++++++++
 gcc/config/riscv/riscv.h                     | 11 ++-
 gcc/config/riscv/riscv.md                    |  3 +
 gcc/optabs.c                                 |  6 ++
 gcc/testsuite/gcc.target/riscv/zbb-bswap.c   | 22 ++++++
 gcc/testsuite/gcc.target/riscv/zbb-min-max.c | 20 +++++-
 gcc/testsuite/gcc.target/riscv/zbs-bexti.c   | 14 ++++
 8 files changed, 162 insertions(+), 19 deletions(-)
 create mode 100644 gcc/testsuite/gcc.target/riscv/zbb-bswap.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/zbs-bexti.c

-- 
2.32.0