[PATCH v2 00/19] target/ppc: DFP instructions using decodetree

[Luis Pires]

This series moves all existing DFP instructions to decodetree and
implements the 2 new instructions (dcffixqq and dctfixqq) from
Power ISA 3.1.

In order to implement dcffixqq, divu128/divs128 were modified to
support 128-bit quotients (previously, they were limited to 64-bit
quotients), along with adjustments being made to its existing callers.
libdecnumber was also expanded to allow creating decimal numbers from
128-bit integers.

Similarly, for dctfixqq, mulu128 (host-utils) and decNumberIntegralToInt128
(libdecnumber) were introduced to support 128-bit integers.

The remaining patches of this series move all of the already existing
DFP instructions to decodetree, and end up removing dfp-ops.c.inc, which
is no longer needed.

NOTE 1: The previous, non-decodetree code, was updating ctx->nip for all the
DFP instructions. I've removed that, but it would be great if someone could
confirm that updating nip really wasn't necessary.

NOTE 2: Some arithmetic function support for 128-bit integers was added,
for now, still using 64-bit pairs. In the near future, I think we should
modify all of them to use Int128 (and introduce UInt128). But that
should be done in another patch series.

Based-on: 20210823150235.35759-1-luis.pires@eldorado.org.br
(target/ppc: fix setting of CR flags in bcdcfsq)
This series assumes bcdcfsq's fix is already in.

Changes in v2:
- Renamed abs64() to uabs64()

Patches missing review:
  target/ppc: Move REQUIRE_ALTIVEC/VECTOR to translate.c
  host-utils: Fix overflow detection in divu128()
  host-utils: move abs64() to host-utils as uabs64()
  host-utils: move checks out of divu128/divs128
  host-utils: add 128-bit quotient support to divu128/divs128
  host-utils: add unit tests for divu128/divs128
  libdecnumber: introduce decNumberFrom[U]Int128
  target/ppc: Implement DCFFIXQQ
  host-utils: Introduce mulu128
  libdecnumber: Introduce decNumberIntegralToInt128
  target/ppc: Implement DCTFIXQQ
  target/ppc: Move dcmp{u,o}[q],dts{tex,tsf,tsfi}[q] to decodetree

--
Luis Pires
Instituto de Pesquisas ELDORADO
Aviso Legal - Disclaimer <https://www.eldorado.org.br/disclaimer.html>

Bruno Larsen (1):
  target/ppc: Move REQUIRE_ALTIVEC/VECTOR to translate.c

Fernando Valle (1):
  target/ppc: Introduce REQUIRE_FPU

Luis Pires (17):
  host-utils: Fix overflow detection in divu128()
  host-utils: move abs64() to host-utils as uabs64()
  host-utils: move checks out of divu128/divs128
  host-utils: add 128-bit quotient support to divu128/divs128
  host-utils: add unit tests for divu128/divs128
  libdecnumber: introduce decNumberFrom[U]Int128
  target/ppc: Implement DCFFIXQQ
  host-utils: Introduce mulu128
  libdecnumber: Introduce decNumberIntegralToInt128
  target/ppc: Implement DCTFIXQQ
  target/ppc: Move dtstdc[q]/dtstdg[q] to decodetree
  target/ppc: Move d{add,sub,mul,div,iex}[q] to decodetree
  target/ppc: Move dcmp{u,o}[q],dts{tex,tsf,tsfi}[q] to decodetree
  target/ppc: Move dquai[q], drint{x,n}[q] to decodetree
  target/ppc: Move dqua[q], drrnd[q] to decodetree
  target/ppc: Move dct{dp,qpq},dr{sp,dpq},dc{f,t}fix[q],dxex[q] to
    decodetree
  target/ppc: Move ddedpd[q],denbcd[q],dscli[q],dscri[q] to decodetree

 hw/i386/kvm/i8254.c                    |   7 +-
 include/hw/clock.h                     |   7 +-
 include/libdecnumber/decNumber.h       |   4 +
 include/libdecnumber/decNumberLocal.h  |   2 +-
 include/qemu/host-utils.h              |  86 +++--
 libdecnumber/decContext.c              |   7 +-
 libdecnumber/decNumber.c               | 130 ++++++++
 target/ppc/dfp_helper.c                | 168 +++++++---
 target/ppc/helper.h                    | 106 ++++---
 target/ppc/insn32.decode               | 171 ++++++++++
 target/ppc/int_helper.c                |  23 +-
 target/ppc/translate.c                 |  25 +-
 target/ppc/translate/dfp-impl.c.inc    | 419 ++++++++++++-------------
 target/ppc/translate/dfp-ops.c.inc     | 165 ----------
 target/ppc/translate/vector-impl.c.inc |  10 +-
 tests/unit/meson.build                 |   1 +
 tests/unit/test-div128.c               | 185 +++++++++++
 util/host-utils.c                      | 137 +++++---
 18 files changed, 1073 insertions(+), 580 deletions(-)
 delete mode 100644 target/ppc/translate/dfp-ops.c.inc
 create mode 100644 tests/unit/test-div128.c

-- 
2.25.1