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Re: [PATCH, middle-end, i386]: reciprocal rsqrt pass + full recip x86 backend support

From: Paolo Bonzini <bonzini at gnu dot org>
To: Uros Bizjak <ubizjak at gmail dot com>
Cc: Richard Guenther <richard dot guenther at gmail dot com>, Tobias Burnus <burnus at net-b dot de>, GCC Patches <gcc-patches at gcc dot gnu dot org>
Date: Fri, 15 Jun 2007 17:11:11 +0200
Subject: Re: [PATCH, middle-end, i386]: reciprocal rsqrt pass + full recip x86 backend support
References: <5787cf470706140216p78e731a2o8ad47c5c4d1efc00@mail.gmail.com> <467253F8.1040901@net-b.de> <5787cf470706150343i279f9875j880854e7601ed5a3@mail.gmail.com> <5787cf470706150407x8c05836vdc32124edfabbc33@mail.gmail.com> <46727BF6.2000106@net-b.de> <5787cf470706150551t4e3a7202l9b309cbf7ec363b3@mail.gmail.com> <84fc9c000706150656n479ddd7mcd5a5c35e9a2d5f8@mail.gmail.com> <4672AB07.8000107@gmail.com>

That said, there is a whole bunch of applications that would kill for -mrecip, even for 11bit ones. Games are one of them, for sure ;)

What about -mrecip=0/1/2 for the number of NR steps? Or would two steps be slower than divss?

Paolo

Follow-Ups:
- Re: [PATCH, middle-end, i386]: reciprocal rsqrt pass + full recip x86 backend support
  - From: Uros Bizjak
- Re: [PATCH, middle-end, i386]: reciprocal rsqrt pass + full recip x86 backend support
  - From: Richard Guenther

References:
- [PATCH, middle-end, i386]: reciprocal rsqrt pass + full recip x86 backend support
  - From: Uros Bizjak
- Re: [PATCH, middle-end, i386]: reciprocal rsqrt pass + full recip x86 backend support
  - From: Tobias Burnus
- Re: [PATCH, middle-end, i386]: reciprocal rsqrt pass + full recip x86 backend support
  - From: Uros Bizjak
- Re: [PATCH, middle-end, i386]: reciprocal rsqrt pass + full recip x86 backend support
  - From: Uros Bizjak
- Re: [PATCH, middle-end, i386]: reciprocal rsqrt pass + full recip x86 backend support
  - From: Tobias Burnus
- Re: [PATCH, middle-end, i386]: reciprocal rsqrt pass + full recip x86 backend support
  - From: Uros Bizjak
- Re: [PATCH, middle-end, i386]: reciprocal rsqrt pass + full recip x86 backend support
  - From: Richard Guenther
- Re: [PATCH, middle-end, i386]: reciprocal rsqrt pass + full recip x86 backend support
  - From: Uros Bizjak

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