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[0/2] RISCV: Reduce code size when compiling with -msave-restore

Message ID cover.1566241794.git.andrew.burgess@embecosm.com
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Series RISCV: Reduce code size when compiling with -msave-restore | expand

Message

Andrew Burgess Aug. 19, 2019, 7:15 p.m. UTC 
The following two patches are an attempt at further reducing code size
when compiling with -msave-restore by attempting to claw back some of
the tail call cases where we currently include a call to
__riscv_save_0 and __riscv_restore_0.

Any feedback, or suggestions for improvements, or for better
approaches I could take are gratefully recieved.

Thanks,
Andrew

--

Andrew Burgess (2):
  gcc/riscv: Include more registers in SIBCALL_REGS
  gcc/riscv: Add a mechanism to remove some calls to _riscv_save_0

 gcc/ChangeLog                                   |  15 +
 gcc/config.gcc                                  |   2 +-
 gcc/config/riscv/riscv-sr.c                     | 375 ++++++++++++++++++++++++
 gcc/config/riscv/riscv.c                        |  13 +
 gcc/config/riscv/riscv.h                        |  22 +-
 gcc/config/riscv/t-riscv                        |   5 +
 gcc/testsuite/ChangeLog                         |  10 +
 gcc/testsuite/gcc.target/riscv/save-restore-2.c |  22 ++
 gcc/testsuite/gcc.target/riscv/save-restore-3.c |  16 +
 gcc/testsuite/gcc.target/riscv/save-restore-4.c |  27 ++
 gcc/testsuite/gcc.target/riscv/save-restore-5.c |   9 +
 gcc/testsuite/gcc.target/riscv/save-restore-6.c |  16 +
 gcc/testsuite/gcc.target/riscv/save-restore-7.c |  30 ++
 gcc/testsuite/gcc.target/riscv/save-restore-8.c |  12 +
 14 files changed, 572 insertions(+), 2 deletions(-)
 create mode 100644 gcc/config/riscv/riscv-sr.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/save-restore-2.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/save-restore-3.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/save-restore-4.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/save-restore-5.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/save-restore-6.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/save-restore-7.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/save-restore-8.c