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[v4,0/2] add APIs to handle alternative sNaN propagation for fmax/fmin

Message ID 20211016085428.3001501-1-frank.chang@sifive.com (mailing list archive)
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Series add APIs to handle alternative sNaN propagation for fmax/fmin | expand

Message

Frank Chang Oct. 16, 2021, 8:54 a.m. UTC 
From: Frank Chang <frank.chang@sifive.com>

In IEEE 754-2019, minNum, maxNum, minNumMag and maxNumMag are removed
and replaced with minimum, minimumNumber, maximum and maximumNumber.

minimumNumber/maximumNumber behavior for SNaN is changed to:
  * If both operands are NaNs, a QNaN is returned.
  * If either operand is a SNaN, an invalid operation exception is signaled,
    but unless both operands are NaNs, the SNaN is otherwise ignored and
    not converted to a QNaN.

This patchset add support of the above alternative sNaN propagation for
fmax/fmin, which is required by RISC-V floating-point v2.2.

Changelog:

v2:
  * Change API names from *_noprop() to *_maximum_number()
    and *_minimum_number().
  * Pick softfloat min/max APIs based on CPU privilege spec version.

Chih-Min Chao (2):
  softfloat: add APIs to handle alternative sNaN propagation for
    fmax/fmin
  target/riscv: change the api for RVF/RVD fmin/fmax

 fpu/softfloat-parts.c.inc | 25 +++++++++++++++++++++++--
 fpu/softfloat.c           | 19 +++++++++++++------
 include/fpu/softfloat.h   | 10 ++++++++++
 target/riscv/fpu_helper.c | 16 ++++++++++++----
 4 files changed, 58 insertions(+), 12 deletions(-)

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2.25.1