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Re: [PATCH v2 00/10] softfloat: Implement float128_muladd
From: |
Richard Henderson |
Subject: |
Re: [PATCH v2 00/10] softfloat: Implement float128_muladd |
Date: |
Thu, 15 Oct 2020 10:23:12 -0700 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 |
Ping.
On 9/25/20 8:20 AM, Richard Henderson wrote:
> Plus assorted cleanups, passes tests/fp/fp-test.
>
> Changes in v2:
> * Add UInt256 type (david)
> * Rewrite and inline shift256RightJamming. This keeps the whole
> UInt256 in registers, avoiding long sequences of loads and stores.
> * Add x86_64 assembly for double shifts. I don't know why the
> compiler can't recognize this pattern, but swapping values in
> and out of %cl (the only register in the base isa that can
> hold a variable shift) is really ugly.
> * Add ppc64 assembly.
>
>
> r~
>
>
> Richard Henderson (10):
> softfloat: Use mulu64 for mul64To128
> softfloat: Use int128.h for some operations
> softfloat: Tidy a * b + inf return
> softfloat: Add float_cmask and constants
> softfloat: Inline pick_nan_muladd into its caller
> softfloat: Implement float128_muladd
> softfloat: Use x86_64 assembly for {add,sub}{192,256}
> softfloat: Use x86_64 assembly for sh[rl]_double
> softfloat: Use aarch64 assembly for {add,sub}{192,256}
> softfloat: Use ppc64 assembly for {add,sub}{192,256}
>
> include/fpu/softfloat-macros.h | 109 +++---
> include/fpu/softfloat.h | 2 +
> fpu/softfloat.c | 620 ++++++++++++++++++++++++++++++---
> tests/fp/fp-test.c | 2 +-
> tests/fp/wrap.c.inc | 12 +
> 5 files changed, 652 insertions(+), 93 deletions(-)
>
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