Widening multiplication, but no narrowing division [i386/AMD64]

[Paul Koning]

> On Jan 9, 2023, at 7:20 AM, Stefan Kanthak <stefan.kanthak@nexgo.de> wrote:
> 
> Hi,
> 
> GCC (and other C compilers too) support the widening multiplication
> of i386/AMD64 processors, but DON'T support their narrowing division:

I wonder if this changed in the recent past.  I have a pattern for this type of thing in pdp11.md:

(define_expand "divmodhi4"
  [(parallel
    [(set (subreg:HI (match_dup 1) 0)
	(div:HI (match_operand:SI 1 "register_operand" "0")
		(match_operand:HI 2 "general_operand" "g")))
     (set (subreg:HI (match_dup 1) 2)
	(mod:HI (match_dup 1) (match_dup 2)))])
   (set (match_operand:HI 0 "register_operand" "=r")
        (subreg:HI (match_dup 1) 0))
   (set (match_operand:HI 3 "register_operand" "=r")
        (subreg:HI (match_dup 1) 2))]
  "TARGET_40_PLUS"
  "")

and I'm pretty sure this worked at some point in the past.  

	paul