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Re: [PATCH] i386: Expand roundeven for SSE4.1+


On Sun, 14 Jul 2019, Uros Bizjak wrote:

> > This patch is for expanding roundeven inline for SSE4.1 and later.
> > Note that this patch is to be applied on top of
> > <https://gcc.gnu.org/ml/gcc-patches/2019-06/msg01828.html>. The patch
> > is bootstrapped and regression tested on x86_64-linux-gnu.
> 
> Actually, your patch at [1] is the way to go, but you need several
> other changes to get x87 mode switching in order. Please also note
> that there is no corresponding non-SSE4 ix86_expand_... function for
> roundeven, so non-SSE4 SSE FP-math <rounding_insn><mode>2 expander has
> to be disabled for ROUNDEVEN int iterator. Please see (otherwise
> untested) attached patch which fixes both issues.

This needs md.texi updates to document the new roundeven<mode> insn 
pattern.

-- 
Joseph S. Myers
joseph@codesourcery.com


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