On Fri, Dec 04, 2020 at 06:37:02PM +0100, Uros Bizjak wrote:
> > + "(INTVAL (operands[3]) & (GET_MODE_BITSIZE (<MODE>mode) - 1))
> > + == GET_MODE_BITSIZE (<MODE>mode) - 1"
> > + [(set (match_dup 4) (match_dup 1))
> > + (set (match_dup 0)
> > + (any_rotate:SWI48 (match_dup 4)
> > + (subreg:QI
> > + (and:SI (match_dup 2) (match_dup 3)) 0)))]
>
> Don't we need
>
> (clobber (reg:CC FLAGS_REG))]
>
> here? (or is this one of the combine splitter peculiarities?)
I was trying that first, but it didn't work. Without the
clobber it actually works right, we don't have the rotate insn with the
masking and no clobber, so in the end combiner does add the clobber there
(or would fail it the clobber couldn't be added).
Jakub
