[PATCH] T3/T4 sparc shifts, plus more timings

Torbjorn Granlund tg at gmplib.org
Sat Mar 30 04:20:24 CET 2013

David Miller <davem at davemloft.net> writes:

  From: David Miller <davem at davemloft.net>
  Date: Fri, 29 Mar 2013 22:14:05 -0400 (EDT)
  > Great.  Let's sort out the strange hang behavior I get with your code.
  > I think it's rshift.  I actually happened to be working on rshift when
  > you sent your combined code, and I also get strange hangs with my
  > rshift too.
  For reference here is the rshift.asm I was using.
Put this at the end of your code, to make it work:

	srlx	u0, cnt, %l2
	or	%l3, %l4, r0

	sllx	u1, tcnt, %l5
	stx	r0, [n + r0_off]	C WAS: rp + 0

	or	%l2, %l5, r1
	sub	n, -(2 * 8), %o5

	srlx	u1, cnt, %l3
	stx	r1, [%o5 + r1_off]	C WAS: rp + 8

	add	n, r0_off, rp

	andcc	n, 8, %g0
	bz,pn	%xcc, L(done)

	add	rp, 8, rp

	ldx	[n + u0_off], u1
	sllx	u1, tcnt, %l4
	or	%l3, %l4, r0
	stx	r0, [rp + 8]
	srlx	u1, cnt, %l3
	stx	%l3, [rp + 16]

	restore retval, 0, %o0


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