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Latest commit 7582494 Sep 14, 2017 @mundaym mundaym cmd/compile: add s390x intrinsics for Ceil, Floor, Round and Trunc
Ceil, Floor and Trunc are pre-existing intrinsics. Round is a new
function and has been added as an intrinsic in this CL. All of the
functions can be implemented as a single 'LOAD FP INTEGER'
instruction, FIDBR, on s390x.

name   old time/op  new time/op  delta
Ceil   2.34ns ± 0%  0.85ns ± 0%  -63.74%  (p=0.000 n=5+4)
Floor  2.33ns ± 0%  0.85ns ± 1%  -63.35%  (p=0.008 n=5+5)
Round  4.23ns ± 0%  0.85ns ± 0%  -79.89%  (p=0.000 n=5+4)
Trunc  2.35ns ± 0%  0.85ns ± 0%  -63.83%  (p=0.029 n=4+4)

Change-Id: Idee7ba24a2899d12bf9afee4eedd6b4aaad3c510
Reviewed-on: https://go-review.googlesource.com/63890
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

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