Date: Thu, 12 Sep 2019 13:57:25 -0400 From: Rich Felker <dalias@...c.org> To: info@...ile-stream.com Cc: musl@...ts.openwall.com Subject: Re: [PATCH] mips: add single-instruction math functions On Wed, Sep 11, 2019 at 01:05:04PM +0300, info@...ile-stream.com wrote: > > non-commit text: > gcc puts annoying nop into the delay slot for these functions, e.g.: > abs.d $f0,$f12 > jr $ra > nop > is there any way to get rid of this without using pure .S? > > > > SQRT.fmt exists on MIPS II+ (float), MIPS III+ (double). > > ABS.fmt exists on MIPS I+ but only cores with ABS2008 flag in FCSR > implement the required behaviour. One other thing: can you confirm/cite that the mips sqrt instructions are correctly-rounded? I would assume so but this needs checking since there have been some low-end fpus that do things wrong (like early pre-vfp ARM ones). Rich
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