On 7/17/20 5:07 PM, Peter Bergner wrote:
> As we discussed offline, we need the duplicated constraint alternatives
> like below. I'll test this and commit this if clean with the following
> additional ChangeLog entry for the p9 addition. Thanks.
Testing was clean, so I pushed the commit. Thanks
On 7/17/20 4:32 PM, Segher Boessenkool wrote:
> Well, just make an "isa" value of "p9"? Then you can just do
>
> (define_insn "trunctdsd2"
> [(set (match_operand:SD 0 "gpc_reg_operand" "=d")
> (float_truncate:SD (match_operand:TD 1 "gpc_reg_operand" "d")))
>(clobber (match_scratch:T
On Fri, Jul 17, 2020 at 04:18:55PM -0500, Peter Bergner wrote:
> On 7/17/20 3:23 PM, Segher Boessenkool wrote:
> > On ISA 3.0B and later you can do
> >
> > mffscdrni %3,7
> > drdpq %2,%1
> > mffscdrn %3,%3
> > drsp %0,%2
> >
> > (saving one insn, and using somewhat cheaper insns).
On 7/17/20 3:23 PM, Segher Boessenkool wrote:
> On ISA 3.0B and later you can do
>
> mffscdrni %3,7
> drdpq %2,%1
> mffscdrn %3,%3
> drsp %0,%2
>
> (saving one insn, and using somewhat cheaper insns). But that is only
> on newer machines, so is this worth it at all? :-)
On Fri, Jul 17, 2020 at 02:47:50PM -0500, Peter Bergner wrote:
> PR92488 shows we do not generate hardware conversion instructions when
> converting from _Decimal128 to _Decimal32. There is no one instruction
> that does the conversion, so we currently call the __dpd_trunctdsd2
> function to do th
PR92488 shows we do not generate hardware conversion instructions when
converting from _Decimal128 to _Decimal32. There is no one instruction
that does the conversion, so we currently call the __dpd_trunctdsd2
function to do the conversion for us. This is slow. Paul Murphy
described a short sequ
