OpenXM_contrib/gmp/mpn/alpha/ev6/addmul_1.asm - diff

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version 1.1.1.2, 2000/12/01 05:44:50

version 1.1.1.3, 2003/08/25 16:06:18

Line 1

dnl Alpha ev6 mpn_addmul_1 -- Multiply a limb vector with a limb and add

dnl the result to a second limb vector.

dnl This file is part of the GNU MP Library.

Line 29 dnl size r18

dnl s2_limb r19

dnl This code runs at 42 cycles/limb on EV4, 18 cycles/limb on EV5, and

dnl exactly 3.625 cycles/limb on EV6...

dnl exactly 3.5 cycles/limb on EV6...

dnl This code was written in close cooperation with ev6 pipeline expert

dnl Steve Root (root@toober.hlo.dec.com). Any errors are tege's fault, though.

dnl Steve Root. Any errors are tege's fault, though.

dnl

dnl Register usages for unrolled loop:

dnl 0-3 mul's

Line 41 dnl 8-15 mul results

dnl 20,21 carry's

dnl 22,23 save for stores

dnl Sustains 8 mul-adds in 29 cycles in the unrolled inner loop.

dnl Sustains 8 mul-adds in 28 cycles in the unrolled inner loop.

dnl The stores can issue a cycle late so we have paired no-op's to 'catch'

dnl them, so that further disturbance to the schedule is damped.