[Qemu-devel] [PATCH v4 0/4] ARM: fix Neon VRECPE and VRSQRTE instructions.

[Christophe Lyon <christophe.lyon@st.com>]

These 4 patches fix the ARM Neon vrecpe and vrsqrte instructions by
matching the algorithms descibed in the ARM ARM.

With these patches, qemu passes my ARM/Neon tests.

Compared to v3, I have split patch #1 into 2 pieces (#1 and #2 here),
and fixed comments from Peter.

Patch #1 modifies softfloat by exporting floatXX_default_nan, i.e. moving all these definitions from softfloat-specialize.h to softfloat.h

Patch #2 introduces a new utility function float32_set_sign() to help
return the right special values (-0, -infinity), as well as new
constants: float32_infinity, float64_half, float64_256 and
float64_512.

Patch #3 uses these newly exported values and uses the VRECPE
algorithm described in the ARM ARM.

Patch #4 uses these newly exported values and uses the VRSQRTE
algorithm described in the ARM ARM.

Thanks to Peter for his careful reviews.

Christophe Lyon (4):
  softfloat: move all default NaN definitions to softfloat.h.
  softfloat: add float32_set_sign(), float32_infinity, float64_half,
    float64_256 and float64_512.
  target-arm: fix support for VRECPE.
  target-arm: fix support for VRSQRTE.

 fpu/softfloat-specialize.h |   68 ---------------
 fpu/softfloat.h            |   78 +++++++++++++++++
 target-arm/helper.c        |  204 +++++++++++++++++++++++++++++++++++++++-----
 3 files changed, 260 insertions(+), 90 deletions(-)

-- 
1.7.2.3