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Re: [PATCH] x86-64: Add FMA multiarch functions to libm

• From: Joseph Myers <joseph at codesourcery dot com>
• To: "H.J. Lu" <hjl dot tools at gmail dot com>
• Cc: GNU C Library <libc-alpha at sourceware dot org>
• Date: Mon, 7 Aug 2017 14:17:01 +0000
• Subject: Re: [PATCH] x86-64: Add FMA multiarch functions to libm
• Authentication-results: sourceware.org; auth=none
• References: <20170806042544.GA11557@gmail.com> <20170806145012.GA15947@gmail.com>

On Sun, 6 Aug 2017, H.J. Lu wrote:> +# FMA is disabled due to [BZ #19003].> +CFLAGS-e_pow-fma.c = -mno-fma -mavx2That's not correct.  You should use -mfma -mavx2 $(config-cflags-nofma), so that fma is used for code explicitly wanting a fused operation (via DLA_FMS), but not implicitly via contraction.-- Joseph S. Myersjoseph@codesourcery.com

• Follow-Ups:
  • Re: [PATCH] x86-64: Add FMA multiarch functions to libm
    • From: H.J. Lu

• References:
  • [PATCH] x86-64: Add FMA multiarch functions to libm
    • From: H.J. Lu
  • Re: [PATCH] x86-64: Add FMA multiarch functions to libm
    • From: H.J. Lu