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[Qemu-devel] [V2 PATCH 00/37] target-ppc: Decimal Floating Point

From: Tom Musta
Subject: [Qemu-devel] [V2 PATCH 00/37] target-ppc: Decimal Floating Point
Date: Mon, 21 Apr 2014 15:54:44 -0500

This patch series adds emulation of the PowerPC Decimal Floating Point (DFP) 
The complete set of DFP instructions defined by the Power ISA is introduced.

The foundation of the emulation code is libdecnumber, a software library that 
models DFP 
numbers and operations in a manner similar to how softfloat models IEEE Binary 
Point.  A subset of the libdecnumber source (from GCC) is dropped into the QEMU 
source tree
and modified slightly; only libdecnumber files containing code that is required 
to implement
the PowerPC DFP instructions are copied.

The DFP instructions are implemented via helpers.  A typical helper does the 

  - The contents of the source registers (PPC FPRs) are converted to 
    internal representation, the decNumber type.  Inputs are either 64 bit 
    or 128 bit (Extended or Quad) densely packed decimal (DPD), depending on 
the specific
    instruction being emulated.
  - A libdecnumber operation is invoked, producing a decNumber result as well 
as status
  - A chain of post-processors is executed to convert status flags and/or input 
and output
    data to PPC status (usually FPSCR bits).
  - The decNumber result is converted back to DPD format and written into the 

  - modified post-processor handling per Richard Henderson's comments; 
eliminated the use
    of lists of function pointers, replacing with aggregated, static functions.
  - cleaned up int64 to decNumber converter.

Tom Musta (37):
  libdecnumber: Introduce libdecnumber Code
  libdecnumber: Eliminate #include *Symbols.h
  libdecnumber: Prepare libdecnumber for QEMU include structure
  libdecnumber: Modify dconfig.h to Integrate with QEMU
  libdecnumber: Change gstdint.h to stdint.h
  libdecnumber: Eliminate redundant declarations
  libdecnumber: Eliminate Unused Variable in decSetSubnormal
  target-ppc: Enable Building of libdecnumber
  libdecnumber: Introduce decNumberFrom[U]Int64
  libdecnumber: Introduce decNumberIntegralToInt64
  libdecnumber: Fix decNumberSetBCD
  target-ppc: Define FPR Pointer Type for Helpers
  target-ppc: Introduce Generator Macros for DFP Arithmetic Forms
  target-ppc: Introduce Decoder Macros for DFP
  target-ppc: Introduce DFP Helper Utilities
  target-ppc: Introduce DFP Post Processor Utilities
  target-ppc: Introduce DFP Add
  target-ppc: Introduce DFP Subtract
  target-ppc: Introduce DFP Multiply
  target-ppc: Introduce DFP Divide
  target-ppc: Introduce DFP Compares
  target-ppc: Introduce DFP Test Data Class
  target-ppc: Introduce DFP Test Data Group
  target-ppc: Introduce DFP Test Exponent
  target-ppc: Introduce DFP Test Significance
  target-ppc: Introduce DFP Quantize
  target-ppc: Introduce DFP Reround
  target-ppc: Introduce DFP Round to Integer
  target-ppc: Introduce DFP Convert to Long/Extended
  target-ppc: Introduce Round to DFP Short/Long
  target-ppc: Introduce DFP Convert to Fixed
  target-ppc: Introduce DFP Convert to Fixed
  target-ppc: Introduce DFP Decode DPD to BCD
  target-ppc: Introduce DFP Encode BCD to DPD
  target-ppc: Introduce DFP Extract Biased Exponent
  target-ppc: Introduce DFP Insert Biased Exponent
  target-ppc: Introduce DFP Shift Significand

 Makefile.target                            |    6 +
 default-configs/ppc-linux-user.mak         |    1 +
 default-configs/ppc-softmmu.mak            |    1 +
 default-configs/ppc64-linux-user.mak       |    1 +
 default-configs/ppc64-softmmu.mak          |    1 +
 include/libdecnumber/dconfig.h             |   40 +
 include/libdecnumber/decContext.h          |  257 +
 include/libdecnumber/decDPD.h              | 1215 +++++
 include/libdecnumber/decNumber.h           |  202 +
 include/libdecnumber/decNumberLocal.h      |  665 +++
 include/libdecnumber/dpd/decimal128.h      |  100 +
 include/libdecnumber/dpd/decimal128Local.h |   47 +
 include/libdecnumber/dpd/decimal32.h       |   98 +
 include/libdecnumber/dpd/decimal64.h       |  100 +
 libdecnumber/decContext.c                  |  434 ++
 libdecnumber/decNumber.c                   | 8194 ++++++++++++++++++++++++++++
 libdecnumber/dpd/decimal128.c              |  564 ++
 libdecnumber/dpd/decimal128Local.h         |   42 +
 libdecnumber/dpd/decimal32.c               |  489 ++
 libdecnumber/dpd/decimal64.c               |  850 +++
 target-ppc/Makefile.objs                   |    1 +
 target-ppc/dfp_helper.c                    | 1314 +++++
 target-ppc/helper.h                        |   54 +
 target-ppc/translate.c                     |  386 ++
 24 files changed, 15062 insertions(+), 0 deletions(-)
 create mode 100644 include/libdecnumber/dconfig.h
 create mode 100644 include/libdecnumber/decContext.h
 create mode 100644 include/libdecnumber/decDPD.h
 create mode 100644 include/libdecnumber/decNumber.h
 create mode 100644 include/libdecnumber/decNumberLocal.h
 create mode 100644 include/libdecnumber/dpd/decimal128.h
 create mode 100644 include/libdecnumber/dpd/decimal128Local.h
 create mode 100644 include/libdecnumber/dpd/decimal32.h
 create mode 100644 include/libdecnumber/dpd/decimal64.h
 create mode 100644 libdecnumber/decContext.c
 create mode 100644 libdecnumber/decNumber.c
 create mode 100644 libdecnumber/dpd/decimal128.c
 create mode 100644 libdecnumber/dpd/decimal128Local.h
 create mode 100644 libdecnumber/dpd/decimal32.c
 create mode 100644 libdecnumber/dpd/decimal64.c
 create mode 100644 target-ppc/dfp_helper.c

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