[PATCH 0/7] RISC-V: Backend support for XVentanaCondOps/ZiCondops

[Philipp Tomsich <philipp.tomsich@vrull.eu>]

Both the XVentanaCondOps (a vendor-defined extension from Ventana
Microsystems) and the proposed ZiCondOps extensions define a
conditional-zero(-or-value) instruction, which is similar to the
following C construct:
  rd = rc ? rs : 0

This functionality can be tied back into if-convertsion and also match
some typical programming idioms.  This series includes backend support
for XVentanaCondops and infrastructure to handle conditional-zero
constructions in if-conversion.

Tested against SPEC CPU 2017.



Philipp Tomsich (7):
  RISC-V: Recognize xventanacondops extension
  RISC-V: Generate vt.maskc<n> on noce_try_store_flag_mask if-conversion
  RISC-V: Support noce_try_store_flag_mask as vt.maskc<n>
  RISC-V: Recognize sign-extract + and cases for XVentanaCondOps
  RISC-V: Recognize bexti in negated if-conversion
  RISC-V: Support immediates in XVentanaCondOps
  ifcvt: add if-conversion to conditional-zero instructions

 gcc/common/config/riscv/riscv-common.cc       |   2 +
 gcc/config/riscv/predicates.md                |  12 +
 gcc/config/riscv/riscv-opts.h                 |   3 +
 gcc/config/riscv/riscv.cc                     |  14 ++
 gcc/config/riscv/riscv.md                     |  27 +++
 gcc/config/riscv/riscv.opt                    |   3 +
 gcc/config/riscv/xventanacondops.md           | 150 ++++++++++++
 gcc/ifcvt.cc                                  | 214 ++++++++++++++++++
 .../gcc.target/riscv/xventanacondops-and-01.c |  16 ++
 .../gcc.target/riscv/xventanacondops-and-02.c |  15 ++
 .../gcc.target/riscv/xventanacondops-eq-01.c  |  11 +
 .../gcc.target/riscv/xventanacondops-eq-02.c  |  14 ++
 .../riscv/xventanacondops-ifconv-imm.c        |  19 ++
 .../gcc.target/riscv/xventanacondops-le-01.c  |  17 ++
 .../gcc.target/riscv/xventanacondops-lt-01.c  |  16 ++
 .../gcc.target/riscv/xventanacondops-lt-03.c  |  17 ++
 .../gcc.target/riscv/xventanacondops-ne-01.c  |  11 +
 .../gcc.target/riscv/xventanacondops-ne-03.c  |  15 ++
 .../gcc.target/riscv/xventanacondops-ne-04.c  |  15 ++
 .../gcc.target/riscv/xventanacondops-xor-01.c |  14 ++
 20 files changed, 605 insertions(+)
 create mode 100644 gcc/config/riscv/xventanacondops.md
 create mode 100644 gcc/testsuite/gcc.target/riscv/xventanacondops-and-01.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/xventanacondops-and-02.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/xventanacondops-eq-01.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/xventanacondops-eq-02.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/xventanacondops-ifconv-imm.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/xventanacondops-le-01.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/xventanacondops-lt-01.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/xventanacondops-lt-03.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/xventanacondops-ne-01.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/xventanacondops-ne-03.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/xventanacondops-ne-04.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/xventanacondops-xor-01.c

-- 
2.34.1