RE: [PATCH v3 00/22] target/ppc: DFP instructions using decodetree

[Luis Fernando Fujita Pires]

Ping?

> -----Original Message-----
> From: Luis Fernando Fujita Pires <luis.pires@eldorado.org.br>
> Sent: segunda-feira, 20 de setembro de 2021 15:51
> To: Luis Fernando Fujita Pires <luis.pires@eldorado.org.br>; qemu-
> devel@nongnu.org; qemu-ppc@nongnu.org
> Cc: david@gibson.dropbear.id.au; groug@kaod.org;
> richard.henderson@linaro.org
> Subject: RE: [PATCH v3 00/22] target/ppc: DFP instructions using decodetree
> 
> Ping.
> 
> Patches 1-4 were already applied, and patches 5-8, 12, 15, 18 are missing
> reviews.
> 
> Thanks,
> 
> --
> Luis Pires
> Instituto de Pesquisas ELDORADO
> Aviso Legal - Disclaimer <https://www.eldorado.org.br/disclaimer.html>
> 
> From: Luis Pires <luis.pires@eldorado.org.br>
> > 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 their 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 I'll send out an RFC to discuss how to do that in another patch series.
> >
> > NOTE 3: The helper names are in uppercase, to match the instruction
> > names and to simplify the macros that define trans* functions.
> > Previously, this wasn't the case, as we were using lowercase
> > instruction names in the pre-decodetree code. Another standalone patch
> > will be sent later on, changing to uppercase the other new
> > (decodetree) helpers whose names are directly related to instruction
> > names, eventually making PPC helper names consistent.
> >
> > 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 v3:
> > - Split the uabs64 patch in 2
> > - Included patch to fix missing zero-extension in divs128
> > - Folded divisor == 0 into the dhi == 0 case in divu128
> > - Moved udiv_qrnnd from softfloat-macros.h to host-utils.h
> > - Used udiv_qrnnd in divu128
> > - Replaced int with bool in divs128
> > - Added unit test to check the divisor normalization in divu128
> > - Removed 'inline' from times_* functions in ppc/translate.c
> > - Used uadd64_overflow in mulu128
> > - Removed unnecessary 'else' from decNumberIntegralToInt128
> >
> > Changes in v2:
> > - Renamed abs64() to uabs64()
> >
> > Patches missing review:
> >   host-utils: fix missing zero-extension in divs128
> >   host-utils: move checks out of divu128/divs128
> >   host-utils: move udiv_qrnnd() to host-utils
> >   host-utils: add 128-bit quotient support to divu128/divs128
> >   host-utils: add unit tests for divu128/divs128
> >   target/ppc: Implement DCFFIXQQ
> >   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 (20):
> >   host-utils: Fix overflow detection in divu128()
> >   host-utils: fix missing zero-extension in divs128
> >   host-utils: introduce uabs64()
> >   i386/kvm: Replace abs64() with uabs64() from host-utils
> >   host-utils: move checks out of divu128/divs128
> >   host-utils: move udiv_qrnnd() to host-utils
> >   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/fpu/softfloat-macros.h         |  82 -----
> >  include/hw/clock.h                     |   7 +-
> >  include/libdecnumber/decNumber.h       |   4 +
> >  include/libdecnumber/decNumberLocal.h  |   2 +-
> >  include/qemu/host-utils.h              | 163 ++++++++--
> >  libdecnumber/decContext.c              |   7 +-
> >  libdecnumber/decNumber.c               | 131 ++++++++
> >  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                 |  23 +-
> >  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               | 197 ++++++++++++
> >  util/host-utils.c                      | 142 ++++++---
> >  19 files changed, 1163 insertions(+), 665 deletions(-)  delete mode
> > 100644 target/ppc/translate/dfp-ops.c.inc
> >  create mode 100644 tests/unit/test-div128.c
> >
> > --
> > 2.25.1