[RFC,00/17] softfloat, hexagon: Cleanup fmaf

Message

Richard Henderson Dec. 8, 2024, 10:48 p.m. UTC

While looking at some float_status usage, I got distracted by some
odd looking hexagon code.  With some minor additions to softfloat,
we can handle all of the special cases.

I have a feeling that dfmpyhh can also be simplified, but I don't
quite grok the accumulator in this case.  It appears to be integral
value, added into the middle of the floating-point partial product?


r~


Richard Henderson (17):
  softfloat: Add float{16,32,64}_muladd_scalbn
  target/arm: Use float*_muladd_scalbn
  target/sparc: Use float*_muladd_scalbn
  softfloat: Remove float_muladd_halve_result
  softfloat: Add float_round_nearest_even_max
  softfloat: Add float_muladd_suppress_add_product_zero
  target/hexagon: Use float32_mul in helper_sfmpy
  target/hexagon: Use float32_muladd for helper_sffma
  target/hexagon: Use float32_muladd for helper_sffms
  target/hexagon: Use float32_muladd_scalbn for helper_sffma_sc
  target/hexagon: Use float32_muladd for helper_sffm[as]_lib
  target/hexagon: Remove internal_fmafx
  target/hexagon: Expand GEN_XF_ROUND
  target/hexagon: Remove Float
  target/hexagon: Remove Double
  target/hexagon: Use mulu64 for int128_mul_6464
  target/hexagon: Simplify internal_mpyhh setup

 include/fpu/softfloat-types.h |   2 +
 include/fpu/softfloat.h       |  14 +-
 target/hexagon/fma_emu.h      |   3 -
 target/sparc/helper.h         |   4 +-
 fpu/softfloat.c               |  64 ++---
 target/arm/tcg/helper-a64.c   |   6 +-
 target/hexagon/fma_emu.c      | 494 +++++++++-------------------------
 target/hexagon/op_helper.c    | 125 +++------
 target/sparc/fop_helper.c     |   8 +-
 target/sparc/translate.c      |  80 +++---
 fpu/softfloat-parts.c.inc     |  16 +-
 11 files changed, 277 insertions(+), 539 deletions(-)